Fire Protection Equipment

Transcription

1 Fire Protection Equipment #SVL500 Model F Preaction Valves "Automatic" Sprinkler 150 Gordon Drive Exton, PA USA Tel: (610) Fax: (610)

2 TABLE OF CONTENTS Text Page General... 1 Approvals... 1 Description / Operation... 1 PreAction Valve... 1 Air Check Valve... 2 Technical Data... 2 Figure 1 Operation Diagram: Model F PreAction Valve Set Position... 3 Figure 2 Operation Diagram: Model Model F PreAction Valve Operating Position... 3 Ordering Information... 4 PreAction Valve Trim Space Requirements... 4 "Automatic" 21/2 Model F PreAction Valve Assembly Parts List... 5 "Automatic" 21/2 Model F PreAction Valve Basic Trim Setup 76DVSP2F for Wet Pilot Operation Parts Drawing & List... 6 "Automatic" 4 Model F PreAction Valve Assembly Parts List... 7 "Automatic" 4 Model F PreAction Valve Basic Trim Setup 76DVSP4F for Wet Pilot Operation Parts Drawing & List... 8 "Automatic" 6 Model F PreAction Valve Assembly Parts List... 9 "Automatic" 6 Model F PreAction Valve Basic Trim Setup 76DVSP6F for Wet Pilot Operation Parts Drawing & List "Automatic" Model F PreAction Valves Wet Pilot Actuation General Installation Piping Graph A: Wet Pilot Limitations for 21/2 Model F PreAction Valve Graph B: Wet Pilot Limitations for 4 Model F PreAction Valve Graph C: Wet Pilot Limitations for 6 Model F PreAction Valve "Automatic" Model F Deluge Valves Dry Pilot Actuation General Graph D: Dry Pilot Actuator Pressure Curves Installation Piping i SVL500

3 Optional Alarms Trouble Alarm Fire Alarm "Automatic" Model B1 Dry Pilot Actuator Symbol Parts List & Drawing Dry Pilot Actuation Trim Options Dry Pilot Actuation Owner s Air Supply (76DPO) Replacement Parts List & Drawing Dry Pilot Actuation Nitrogen Supply (76DPN) Replacement Parts List & Drawing "Automatic" Model F PreAction Valves Electric Actuation General Installation Electric Actuation Trim Option Parts List & Drawing Technical Data Ordering Information Testing and Maintenance Testing Testing Waterflow Alarm Devices Testing LowAirPressure Alarm Devices Supervisory Air Pressure Dry Pilot Actuation System Flow Test at Main Drain Valve (Main Drain Test) Testing of PreAction Valve TestPartial Flow TestFull Flow Testing of Dry Pilot Actuation System Maintenance Clapper/Clapper Latch Diaphragm Actuator Clapper Facing Seat Ring Alarm Line Strainer, Pilot Line Strainer & Air Supply Strainers Alarm Test Valve & Main Drain Valve System Control Valve, Alarm Control Valve, Pilot Ball Valve & Air (or Nitrogen) Supply Control Valves Dry Pilot Actuator Electric Solenoid Valve PreAction Valve and Trim Air Pressure SVL500 ii

4 Priming Water Level Valve Enclosure System Low Points Resetting of System System Pressure Test Records iii SVL500

5 DATA SHEET #SVL500 MODEL F PreAction Valves General The "Automatic" Model F PreAction Valve is a waterflow control/alarm device designed for installation in the main supply to a preaction system of sprinklers or nozzles. It serves three basic functions. First, the valve holds back the water, keeping it from flowing into the system until such time that the detection system operates (see Description/Operation). Second, the valve provides a means to supervise the system piping. Air (or nitrogen) pressure is maintained in the system through connections at the preaction valve. If a break should occur in the piping, or if a sprinkler should operate accidentally, the loss of supervisory air is used to indicate trouble. This is accomplished via a Iowairpressure alarm switch connected to an electrically operated signaling device such as a horn. Third, the preaction valve provides the means to actuate a fire alarm when water flows into the system. The alarm may be accomplished in two ways: (1) mechanically by means of a water flow to a water motor alarm and/or (2) electrically via a waterpressureactuated alarm switch (circuit closer) connected to an electrically operated signaling device such as a bell or light. The Model F PreAction Valve is available in three sizes: 21/2" (63.5 mm), 4" (101.6 mm) and 6" (152.4 mm). Each valve is provided with a basic trim package that includes water supply connections for wet pilot actuation, manual control connections, manual air supply and priming connections for supervision of the system piping, drain connections, alarm outlets and an alarm test bypass. Optional trim packages are available to provide connections for dry pilot or electrical operation, and for automatic air or nitrogen supply for system supervision. Alarm or supervisory devices are provided separately. Approvals Model F PreAction Valves are listed or approved by various testing and inspection organizations concerned with product evaluation. These include: Underwriters Laboratories (UL) Factory Mutual (FM) Underwriters Laboratories of Canada (ULC) The valves are listed/approved with specific trim and for installation in accordance with the applicable requirements of NFPA 13. Therefore, no substitutions or omissions, in part or in full, are allowed. All devices are listed/approved for a maximum water working pressure (WWP) of 175 psi ( kpa or 12.1 bar), and the valves have an operating pressure range of 20 to 175 psi. Description/Operation With a preaction system, two things must happen before water is discharged onto a fire. First, the fire must operate the detection system and operate the preaction valve. This action allows water to flow into the system and fill the piping. But the water cannot be discharged until sprinklers in the area of the fire operate. This second action generally occurs after the water is available at the sprinklers or on its way to the area. The Model F PreAction Valve has two principal parts: The main valve to hold back the water and provide alarm connections, and a swing check valve to provide a positive seal for supervisory air. PreAction Valve. The Model F PreAction Valve depends on water pressure acting on a diaphragm actuator to keep the clapper closed against the main water supply pressure. The valve operates when the pressure in the diaphragm actuator is relieved. In the set position (see Figure 1 on page 3), the clapper is held closed by the clapper latch. And the latch, in turn, is held in place by force applied to it by a push rod from the diaphragm actuator. In the diaphragm actuator, water pressure acts on a diaphragm to hold the push rod in place against the clapper latch. Water pressure to the diaphragm actuator is maintained through connections from the main water supply taken upstream from the OS&Y. These connections also supply water pressure to a wet pilot line of sprinklers, or to a dry pilot actuator or electric solenoid valve, depending on the type of detection system used. When a fire opens a pilot sprinkler or operates an electrical detector, water pressure in the pilot line is relieved.

6 This causes a loss of pressure in the diaphragm actuator. And without pressure acting on the diaphragm, the push rod cannot hold the clapper latch in place. The main water supply pressure then forces the clapper open. Water flows through the preaction valve into the system piping and through the alarm line connections to sound the water motor alarm and/or operate the pressureactuated alarm switch (see Figure 2 on page 3). Operation of the manual control station at the preaction valve also relieves the water pressure in the pilot line and operates the valve. Upon completion of each Model F PreAction valve installation, a partial flow or full flow test shall be conducted. The system water pressure and the diaphragm actuator operation pressure shall be recorded. See the System Pressure Test Records chart at the end of this document. Air Check Valve. The swing check valve, installed directly above the preaction valve, serves as an air check valve. It has a rubberfaced clapper and, in the set position (see Figure 1), priming water is provided above the clapper up to the level of the air supply connections. Above the priming water level, compressed air (or nitrogen) is maintained to supervise the system piping. The purpose of the priming water is to provide a positive seal to prevent air from escaping past the clapper of the check valve and through the alarm connections of the preaction valve. The purpose of the supervisory air is to ensure the integrity of piping above the air check valve on the preaction system. Air pressure is maintained in the system at 24 ounces per square inch. If the piping should be damaged, or if a sprinkler should be broken or opened accidentally causing a loss of supervisory air pressure, a trouble alarm will be initiated via a lowairpressure alarm switch. Technical Data Available Sizes:... 21/2" (63.5 mm) 4" (101.6 mm) 6" (152.4 mm) Inlet & Outlet:... Class 125 Flanged Water Working Pressure: psi ( kpa or 12.1 bar) Setup:... Wet Pilot Actuation Dry Pilot Actuation Electric Actuation Installation:... Vertical Only Listings & Approvals:... UL Listed FM Approved Pressure Loss: For use in hydraulic calculations, the pressure loss through the preaction and air check valves may be expressed as equivalent feet of pipe: 21/2" Valve = 19 Ft 4" Valve = 39 Ft 6" Valve = 60 Ft Shipping Weights: 21/2" Valve = 57 lbs 76DVSP2 Trim = 113 lbs 4" Valve = 109 lbs 76DVSP4 Trim = 118 lbs 6" Valve = 201 lbs 76DVSP6 Trim = 144 lbs Conversion Factors: 1 inch = 25.4 millimeters (mm) 1 psi = kilopascals (kpa) bar 1 gallon = liters (L) 2 HA I I K HA E F I E 2 = % " &! #! " #! %! & $ ' #! " E $! # %! % ' % # %!! $ " E $ # & '! M E C F E $ E # "! % & # Pressure Loss Curves! % # %! # # 2 SVL500

7 SVL500 3

8 "Automatic" Model F PreAction Valves Ordering Information "Automatic" Model F PreAction Valves Item/Setup PreAction Valve only (without trim) Air Check Valve only (without trim) 21/2" (63.5 mm) Valve 4" (101.6 mm) Valve 6" (152.4 mm) Valve Symbol Number Part Number Symbol Number Part Number Symbol Number Part Number Basic Trim Setup for PreAction Valve & Air Check Valve: Wet Pilot Actuation 76DVSP2F DVSP4F DVSP6F Trim Options for Dry Pilot Actuation Valve (less actuator): Note: Dry Pilot Actuator is to be ordered separately and in addition to the trim option. Dry Pilot Actuation/Owner s Air Supply to connect to Basic Trim Setup for supply from reliable source of owner s air. Optional: 1/2 Safety Valve for Owner s Air Supply*. Dry Pilot Actuation/Nitrogen Supply to connect to Basic Trim Setup for supply from nitrogen cylinders (less cylinders). Optional: Nitrogen Cylinder Restraints. 1/2 x 141/2 Proof Coll Chain 2 required. Missing Link 1 required. Dry Pilot Actuator Automatic Model B1 Trim Options for Electric Actuation to connect to Basic Trim Setup: Electric Solenoid Valve VAC, 60 Hz (not FM Approved). Electric Solenoid Valve 24 VDC. Note: Other voltages are available on special order. See data page on Electric Solenoid Valve. Optional Alarms: Note: Low Air Pressure Switch for supervisory air and connections for an Alarm Switch are included as part of the Basic Trim Setup. Connections for Low Air (or Nitrogen) Pressure Alarm Switch are included in the Dry Pilot Actuation Trim Options. The Alarm Switch and Low Air (or Nitrogen) Pressure Alarm Switche must be ordered separately. For technical data on Automatic switches, see the Electric Alarm Devices data sheet. 76DPSPO 76DPSPN DPSPO 76DPSPN DPSPO 76DPSPN * The 1/2 Safety Valve is an optional item to be provided only if required. Valve is set to operate at 55 psi. Fasteners required to secure one end of chain to structure must be ordered separately. PreAction Valve Trim Space Requirements Dimension 21/2" (63.5 mm) Valve 4" (101.6 mm) Valve 6" (152.4 mm) Valve A 9 (228.6 mm) 9 (228.6 mm) 9 (228.6 mm) B 131/2 (242.9 mm) 141/2 (368.3 mm) 161/4 (412.7 mm) C 93/4 (247.6 mm) 93/4 (247.6 mm) 11 (279.4 mm) D 115/8 (295.3 mm) 143/4 (374.6 mm) 153/4 (400.0 mm) E* 12 (304.8 mm) 121/2 (317.5 mm) 15 (381.0 mm) F* 24 (609.6 mm) 24 (609.6 mm) 24 (609.6 mm) G 205/8 (523.9 mm) 111/2 (292.1 mm) 13 (330.2 mm) H 10 (254.0 mm) 9 (228.6 mm) 10 (254.0 mm) J 9 (228.6 mm) 125/16 (312.7 mm) 18 (457.2 mm) K 93/4 (247.6 mm) 10 (254.0 mm) 61/4 (158.7 mm) L* 48 ( mm) 48 ( mm) 48 ( mm) * These dimensions represent minimum recommended clearances. 4 SVL500

9 "Automatic" 21/2" Model F PreAction Valve Assembly Special Note: When a complete valve assembly is provided, the Diaphragm Actuator (21), ORing (22), Stud Bolts (18) and Nuts (19) are boxed separately and placed inside the valve for shipment. In the field, place the ORing on the Diaphragm Actuator and install hand tight only. DO NOT WRENCH. Parts List "Automatic" 21/2" Model F PreAction Valve Assembly Symbol No Item Number Part Name Material Valve Body Subassembly Body Seat Ring Handhole Cover Nameplate Drive Screws: #0 x 1/4 2 required Handhole Gasket Hex Head Cap Screws 1/2 x 1 Long 6 required Handhole Cover Insert Clapper Subassembly Clapper Stop Stop Spring Stop Hinge Pin Clapper Facing Facing Retaining Plate Clapper Face Screw 3/8 x 5/8 Long Flat Head Cast Iron Cast Iron Aluminum Steel Rubber Steel S.S. Rubber Cast Iron Symbol Number S S A Part Number Hinge Pin Hinge Pin Bushings (2 in Body) 1/2 Plug 2 required Clapper Latch Latch Bushing Latch Hinge Pin S.S Stud Bolts 5/8 x 21/4 long 2 required Hex Nuts 5/8 2 required 1/4 Plug 13/4 Diaphragm Actuator ORing I.D. x 0.75 O.D. Steel Steel Cast Iron Rubber Items are not shown in detail. These items are not field replaceable. SVL500 5

10 "Automatic" 21/2" Model F PreAction Valve Basic Trim Setup 76DVSP2F for Wet Pilot Operation 6 SVL500

11 "Automatic" 4" Model F PreAction Valve Assembly Special Note: When a complete valve assembly is provided, the Diaphragm Actuator (20), ORing (21), Stud Bolts (17) and Nuts (18) are boxed separately and placed inside the valve for shipment. In the field, place the ORing on the Diaphragm Actuator and install hand tight only. DO NOT WRENCH. Parts List "Automatic" 4" Model F PreAction Valve Assembly Symbol No Item Number Part Name Material Valve Body Subassembly Body Seat Ring Handhole Cover Nameplate Drive Screws: #0 x 1/4 2 required Handhole Gasket Hex Head Cap Screws 5/8 x 11/2 Long 6 required Handhole Cover Insert Clapper Subassembly Clapper Stop Stop Spring Stop Hinge Pin Clapper Facing Facing Retaining Plate Clapper Face Screw 1/2 x 1 Long Hex Head Cast Iron Cast Iron Aluminum Steel Rubber Steel S.S. Rubber Cast Iron Symbol Number S S Part Number Hinge Pin Hinge Pin Bushings (2 in Body) 3/4 Plug 2 required Clapper Latch Latch Bushing Latch Hinge Pin Stud Bolts 5/8 x 23/4 long 2 required Hex Nuts 5/8 2 required 1/4 Plug 2 Diaphragm Actuator ORing I.D. x O.D. Steel Steel Cast Iron Rubber Items are not shown in detail. These items are not field replaceable. SVL500 7

12 "Automatic" 4" Model F PreAction Valve Basic Trim Setup 76DVSP4F for Wet Pilot Operation 8 SVL500

13 "Automatic" 6" Model F PreAction Valve Assembly Special Note: When a complete valve assembly is provided, the Diaphragm Actuator (22), ORing (23), Stud Bolts (19) and Nuts (20) are boxed separately and placed inside the valve for shipment. In the field, place the ORing on the Diaphragm Actuator and install hand tight only. DO NOT WRENCH. Parts List "Automatic" 6" Model F PreAction Valve Assembly Symbol No Item Number Part Name Material Valve Body Subassembly Body Seat Ring Stud Bolt 3/4 x 23/8 Long Handhole Cover Nameplate Drive Screws: #0 x 1/4 2 required Handhole Gasket Hex Head Cap Screws 3/4 x 11/2 Long 7 required Handhole Cover Insert Clapper Subassembly Clapper Stop Stop Spring Stop Hinge Pin Clapper Facing Facing Retaining Plate Clapper Face Screw 1/2 x 7/8 Long Hex Head Cast Iron Steel Cast Iron Aluminum Steel Rubber Steel S.S. Rubber Cast Iron Symbol Number S S B C 76605A Part Number Hinge Pin Hinge Pin Bushings (2 in Body) 3/4 Plug 2 required Clapper Latch Latch Bushing Latch Hinge Pin Stud Bolts 3/4 x 3 long 2 required Hex Nuts 3/4 3 required 1/4 Plug 3 Diaphragm Actuator ORing I.D. x O.D. Steel Steel Cast Iron Rubber Items are not shown in detail. These items are not field replaceable. SVL500 9

14 "Automatic" 6" Model F PreAction Valve Basic Trim Setup 76DVSP6F for Wet Pilot Operation 10 SVL500

15 "Automatic" Model F PreAction Valves Wet Pilot Actuation General The basic trim setup for the "Automatic" Model F PreAction Valve is for wet pilot actuation. The basic detection system, therefore, is the wet pilot line of sprinklers. This system consists of standard automatic fixedtemperature sprinklers (1/2" orifice x 1/2" NPT) spaced throughout the protected area and connected to the preaction valve by means of pilot line piping either 1/2" or 3/4" in size, depending on the requirements for the particular installation. Water pressure is maintained in the pilot line through a restricted connection from the main water supply which is taken upstream of the System Control Valve. When a sprinkler operates, the flow through the open sprinkler is at a rate greater than that which can pass through the orifice restriction in the water supply connections. This causes a drop in the pilot line pressure. And with this drop in pressure, the diaphragm actuator can no longer hold the clapper latch in place. The preaction valve operates and water flows into the system (see Description/Operation). Operation of the manual control station at the preaction valve also relieves the water pressure in the pilot line and operates the valve. Note: Wet pilot lines are not to be installed in areas subject to freezing temperatures. Installation Wet pilot lines for 21/2", 4" and 6" Model F PreAction Valves are to be installed within the limitations shown on Graphs A, B and C on page 12. The curves on each graph show the maximum length of 1/2" pilot piping that may be provided with the preaction valve in relation to the height of the pilot line above the valve and the water supply pressure at the valve. The limitations are shown for pressures up to 175 psi, the maximum water working pressure of the Model F PreAction Valves. The length/height/pressure relationship of the pilot line, pilot sprinkler and water supply is one of hydraulics. The curves on Graph A, B and C are based on a 1/2" pilot line. If the size of the line is increased to 3/4", the lengths shown on each graph may be increased by a factor of 4. Example: Including a rise of 50 ft., the distance from the most remote 1/2" orifice pilot sprinkler back to the 21/2" preaction valve is 350 ft. The water supply pressure at the valve is 100 psi. The designer must determine if an installation with a 1/2" wet pilot line is within the length/ height/pressure limitations set for the valve. Referring to the 350 ft. curve on Graph A, the designer finds that the height limitation is approximately 30 ft. for a 100 psi supply pressure. Since the pilot sprinklers must be at an elevation of 50 ft., it is obvious that a 1/2" pilot line cannot be used. The designer must now determine if a 3/4" pilot line will be satisfactory. On Graph A, moving up the vertical line at 100 psi until it intersects with the horizontal one for 50 ft., the designer finds the point to be between two curves. Interpolating, he determines that for this height and pressure a 1/2" pilot line may have a length of approximately 235 ft. It is obvious, then, that a 3/4" pilot line can be used, since multiplying the 235 ft. length by the factor of 4 gives a value well above the 350 ft. length involved. In other words, an installation can be provided with 3/4" pilot line piping up to 940 ft. long when the pilot sprinklers are located at a height 50 ft. above the preaction valve. Piping Pilot line pipe may be 1/2" (or 3/4") steel or copper. If steel pipe is used, it must be galvanized. Fittings used with steel pipe may be cast iron or malleable iron. Fittings need to be galvanized only when required because of external conditions. SVL500 11

16 "Automatic" Model F PreAction Valves Graph A: Wet Pilot Limitations for 21/2" Model F PreAction Valve! # 2 E J E A 0 A EC D JE A A J ' % " & " " %! $ &! # # "! ' $ = N E K G K EL = A J A C JD B 2 E J E A M EJD 2 E J5 F HE A HI # J # J $ # J % $! # J % J ' $ "! # J $ % " J ' # J # " " # J! % # # J $ % $ $ J & '!! & " % $ $ " " & # # $ ' & % " ' $ # $ % #! % 9 = JA H 5 K F F O 2 H A I I K H A E = Graph B: Wet Pilot Limitations for 4" Model F PreAction Valve 2 E J E A 0 A EC D JE A A J %! $ &! # # "! ' $! = N E K G K EL = A J A C JD B 2 E J E A M EJD 2 E J5 F HE A HI # J # J! # J $! J ' "! & " % $ $ " " & # # $ ' & % " ' $ # $ % #! % 9 = JA H 5 K F F O 2 H A I I K H A E = Graph C: Wet Pilot Limitations for 6" Model F PreAction Valve 2 E J E A 0 A EC D JE A A J %! $ &! # # "! ' $! = N E K G K EL = A J A C JD B 2 E J E A M EJD 2 E J5 F HE A HI # J # % # J ' J! # # J " # % # J % $ J $! J ' "! # J $ %! & " % $ $ " " & # # $ ' & % " ' $ # $ % #! % 9 = JA H 5 K F F O 2 H A I I K H A E = * If the size of the pilot line is increased to 3/4, the lengths shown on each graph may be increased by a factor of SVL500

17 "Automatic" Model F PreAction Valves Dry Pilot Actuation General An optional actuation setup for the "Automatic" Model F PreAction Valve is for dry pilot actuation. With this setup, the detection system is the dry pilot line of sprinklers. Suitable for installation in areas subject to freezing temperatures, the dry pilot detection system consists of standard automatic fixedtemperature sprinklers (1/2" orifice x 1/2" NPT) spaced throughout the protected area and connected to a dry pilot actuator at the preaction valve by means of 1/2" pilot line piping. The system is pressurized with either compressed air or nitrogen. When a sprinkler operates, the air or nitrogen pressure in the pilot line is released. This relieves the pressure on the dry pilot actuator, allowing it to open and relieve the water pressure in connections at the preaction valve. Water pressure to the dry pilot actuator and on the diaphragm actuator is maintained through a restricted connection from the main water supply. When the dry pilot actuator opens, the flow to drain is at a rate greater than that which can pass through the orifice restriction. This causes a drop in the water pressure and with this drop in pressure, the diaphragm actuator can no longer hold the clapper latch in place. The preaction valve operates and water flows into the system (see Description/Operation). Operation of the manual control station at the preaction valve also relieves the water pressure and operates the valve. Graph D shows the air pressure (or nitrogen pressure) to be maintained in the dry pilot line for water pressures up to 175 psi (see upper curve). The graph also shows the air pressure at which the dry pilot actuator operates in relation to the water supply pressure (see lower curve). The difference between the two curves indicates the pressure drop required for operation of the actuator. 2 E J E A ) EH 2 H A I I K H A E = " % $! %! & $ ' 2 E J E A 2 HA I I K HA )? JK = J H F A H= JE C 2 HA I I K HA # % #! " # % # # % $ & ' # & $ #! " % # % 9 = JA H 5 K F F O 2 H A I I K H A E = Graph D: Dry Pilot Actuator Pressure Curves Example: The water supply pressure at the preaction valve is 100 psi. The designer must determine the pilot line pressure to be maintained. Referring to the upper curve on Graph D, the designer finds that a pilot line pressure of approximately 31 psi is required for a water supply pres sure of 100 psi. He also notes that the dry pilot actuator will operate when the pilot line pressure reaches 15 psi (a drop of approximately 16 psi). Installation The dry pilot detection system for the Model F PreAction Valve is very similar to the piping in a dry pipe system in that it consists of lines of sprinklers containing air under pressure. It should be installed and tested, therefore, in a manner similar to that required for a dry pipe system (see NFPA 13). There are two trim options for dry pilot actuation one for owner s air supply and another for supply from nitrogen cylinders. The trim option for owner s air is based on the supply being from a reliable source. If any other device or equipment is required (a drum drip or air tank, for example) it must be provided separately. The trim option setup does include an outlet for a safety valve which may be ordered as an optional item. The trim option for nitrogen supply does not include the nitrogen cylinders. These must be provided separately. Fasteners to secure them to the building structure can be ordered as optional items. For air or nitrogen pressures to be maintained in the dry pilot line for various water supply pressures (up to 175 psi), refer to Graph D. Piping Pilot line pipe may be 1/2" steel or copper. If steel pipe is used, it must be galvanized. Fittings used with steel pipe may be cast iron or malleable iron. Fittings need to be galvanized only when required because of external conditions. Optional Alarms A pressure switch may be added to the dry pilot detection system to (1) sound a trouble alarm on loss of air or nitrogen pressure from the system and/or (2) to sound a fire alarm when there is a substantial loss of system pressure, as when a pilot sprinkler operates. An outlet for the optional switch is provided in each trim option for dry pilot actuation. For technical data on "Automatic" pressure switches, see Electric Alarm Devices data sheet. Trouble Alarm. The pressure switch used to signal low air pressure is to be set to indicate trouble (e.g., sound a trouble horn) on a loss of 6 psi in pilot line pressure. Fire Alarm. The pressure switch used to signal operation of a pilot sprinkler is to be set to actuate a fire alarm (e.g. sound a bell) on a loss of 15 psi in pilot line pressure. SVL500 13

18 "Automatic" Model F PreAction Valves "Automatic" Model B1 Dry Pilot Actuator Symbol Parts List Item No Part Name Housing Assembly Actuator Body Actuator Cover Hex Head Cap Screws 5/16 x 1 Long 8 required Hex Nuts 5/16 8 required Diaphragm /Valve Mechanism Diaphragm Diaphragm Plate Seat Ring Guide Disc Spring Symbol No Part No Dry Pilot Actuation Trim Options Dry Pilot Actuation Owner s Air Supply (76DPSPO) 14 SVL500

19 "Automatic" Model F PreAction Valves Dry Pilot Actuation Trim Options Dry Pilot Actuation Nitrogen Supply (76DPSPN) SVL500 15

20 "Automatic" Model F PreAction Valves Electric Actuation General An optional actuation setup for the "Automatic" Model F PreAction Valve is for electric actuation. With this setup, the detection system is an electric fire detection system. Water pressure to the electric solenoid valve and on the diaphragm actuator is maintained through a restricted connection from the main water supply. When the electric solenoid valve opens, due to a signal from an electric control panel, the flow to drain is at a rate greater than that which can pass through the orifice restriction. This causes a drop in the water pressure at the diaphragm actuator and with this drop in pressure, the diaphragm actuator can no longer hold the clapper latch in place. The preaction valve operates and water flows into the system (see Description/ Operation). Operation of the manual control station at the preaction valve also relieves the water pressure and trips the valve. Installation The electric solenoid valve is installed into the basic preaction trim as shown in the illustration below. Electric Actuation Trim Option Note: Items 2 through 6 are included with the basic trim setup for the Model F Preaction Valve. Refer to print 76DVSP2F, 76DVSP4F or 76DVSP6F for bill of material. 16 SVL500

21 Electric Solenoid Valves Technical Data For AC Service: VAC, 50 Hz 120 VAC, 60 Hz Water Working Pressure: psi ( kpa or 12.1 bar) Normally Closed For DC Service: VDC 120 VDC 125 VDC 250 VDC Listings:... UL Listed for fire protection service Ordering Information "Automatic" Solenoid Valves Model No. Voltage Wattage NEMA Rating Symbol Number Part Number 73218BN4UNLVN0C111P3 120 VAC, 60 Hz 110 VAC, 50 Hz 10 1, 2, 3, 3S, 4 & 4X BN4UNLVN0C111C2 24 VDC 10 1, 2, 3, 3S, 4 & 4X BN4UNLVN0C111C6 120 VDC 10 1, 2, 3, 3S, 4 & 4X BN4UNLVN0C111N9 250 VDC 10 1, 2, 3, 3S, 4 & 4X A VAC, 60 Hz 110 VAC, 50 Hz , 2, 3, 3S, 4 & 4X VDC , 2, 3, 3S, 4 & 4X VDC , 2, 3, 3S, 4 & 4X VDC , 2, 3, 3S, 4 & 4X Note: Solenoid valves suitable for installation in areas requiring explosionproof equipment are available on special order. These switches are nonstock items and are available on special order. SVL500 17

22 Testing and Maintenance Reference NFPA 25, Recommended Practice for the Inspection, Testing and Maintenance of Sprinkler Systems Testing Before proceeding with any test involving water flow, certain precautions need to be taken. 1. Check the location where the test connection discharges to make sure that all is clear and that there is no possibility of the water flow causing damage or injury. 2. Check the end of the test connection to make sure that it is unobstructed. To obtain a satisfactory test, there must be an unrestricted flow of water when the test valve is wide open. 3. Check for alarm connections to a central station or fire department. If such connections are found, give proper notice to the signal receiving station before proceeding with the test. Testing Waterflow Alarm Devices NFPA 25 recommends that the waterflow alarm devices be tested quarterly. For a system using the Model F PreAction Valve, the primary way to test this equipment is by first closing the Alarm Control Valve, then opening the Alarm Test Valve. These two valves, provided as part of the preaction valve trim, must be operated in this sequence to keep water from entering the system. The waterflow devices can be tested without operating the system, since the water supply for the alarm test line is taken from a point below the preaction valve clapper (see Description/Operation). Waterflow alarms may also be tested by operating the preaction valve and allowing water to flow into the system. This means of testing, however, should be used only when a full flow test of the valve is required. Caution: If alarms connect to a central station or fire department, notify the signal receiving station when all tests have been completed. Testing LowAirPressure Alarm Devices The lowairpressure alarm devices on a preaction system should be tested at least semiannually. Supervisory Air Pressure. The lowairpressure alarm switch and connected alarms may be tested as follows: 1. While observing the Air Pressure Gage, slowly open the Priming Cup Valve to bleed supervisory air from the system piping. Note: It is not necessary to close the air supply control valve. Because of the restriction provided in the air supply line, the air pressure will be lost through the priming cup valve at a rate greater than it can be replaced. 2. When the lowairpressure alarms sound and/or operate, quickly close the Priming Cup Valve. At the same time, note the pressure reading on the Air Pressure Gage. Note: The switch should be set to operate at approximately 8 ounces (3.5 kpa). 3. If all devices perform satisfactorily, restore the supervisory air pressure on the system to the proper level (see Maintenance Air Pressure). 4. If alarms connect to a central station, notify the signal receiving station when all tests have been completed. Dry Pilot Actuation System. See separate discussion: Testing of Dry Pilot Actuation System on page 20. Flow Test at Main Drain Valve (Main Drain Test) NFPA 25 recommends that a water flow test be made quarterly from the main drain valve at the system riser. The purpose of this test is to show whether or not the normal water supply is available to the system. By comparing static and residual pressure readings with those previously established, a main drain test can indicate the possible presence of closed valves or other obstruction in the supply piping. The procedure for conducting a Main Drain Test is as follows: 1. With the Main Drain Valve closed, note and record the reading on the Water Pressure Gage at the Pre Action Valve. 2. Open the Main Drain Valve slowly until it is wide open. Then, check to make sure that a full steady flow of water is discharging from the main drain pipe. Note: If a full steady stream is not discharging, check the main drain piping further for possible obstructions. 3. Allow the water to flow until the reading on the Water Pressure Gage drops and stabilizes. Then, record this reading. Note: The first and higher pressure reading is the static pressure. The second, lower reading is the residual pressure with a given flow discharging from the main drain pipe. 18 SVL500

23 4. Close the Main Drain Valve slowly. Caution: If alarms have been temporarily shut off, they must be returned to service. If alarms connect to a central station or fire department, notify the signal receiving station when the test has been completed. 5. Compare both pressure readings with previously established or normal readings. Note: If the readings compare favorably, the water supply may be considered satisfactory. If, however, the pressure readings vary to any great extent, the condition should be investigated to determine the cause. Some possible causes are: Partially or totally closed system control valves. Clogged or frozen water mains. Serious leakage at valves or mains. Testing of PreAction Valve NFPA 25 recommends that the preaction valve be inspected and tested at least annually. It is recommended that the preaction valve be inspected and tested on a quarterly, semiannual, or annual basis depending on the ambient conditions present at the valve installation. More frequent inspection and testing may be required if the water supply or ambient conditions are unusually corrosive, or of such a nature as to have an adverse effect on the operation of the valve or fire protection system.if the valve is used as a foam companion valve, the valve should be tested at least quarterly. The usual procedure is to operate the preaction valve without permitting a full flow of water into the system. But periodically, as recommended by the Authority Having Jurisdiction, a full flow test should be provided to check the complete function of the system. These two test procedures are designated, respectively, as TestPartial Flow and Test Full Flow. Note: Preaction valves should be tested during warm weather. Note: Before proceeding with any test of a preaction valve, the water supply line to the system should be thoroughly flushed. The system main drain may be used for this purpose; however, if there is a hydrant on the supply line, it should be used to flush the piping before the main drain is opened. Test Partial Flow. The procedure for testing the preaction valve without a full flow of water is as follows: 1. Open the Main Drain Valve slowly until it is wide open. Then, check to make sure that a steady full flow of water is discharging from the main drain pipe. 2. Allow the water to flow at full pressure long enough to clear the water of any accumulation of scale or foreign material. 3. Slowly close the Main Drain Valve. 4. Close the System Control Valve, then open it just slightly until there is enough pressure to raise the clapper to a stopped position when the valve is operated. The preaction valve is now ready for testing. 5. At the Manual Control Station, pull the handle to open the enclosing box, then pull the interior operating lever down. Water should discharge from the drain tubing to relieve the pressure in the diaphragm actuator line and operate the preaction valve. Note: The preaction valve may also be tested by opening the test valve on the pilot line to simulate the operation of a pilot sprinkler or by applying heat to an electrical detector. 6. When the preaction valve operates, quickly close the System Control Valve and open the Main Drain Valve. 7. Record the system water pressure and the diaphragm actuator pressure at which the valve operated. Compare this data with initial installation test records. Note: If the diaphragm actuator operating pressure exceeds plus or minus 20% of the operating pressure recorded at initial valve installation, the cause should be determined and the condition corrected (See Maintenance). 8. Thoroughly clean the preaction valve and diaphragm actuator, renew parts as required and reset the valve (see Resetting of System). Test Full Flow. The procedure for testing the preaction valve with a full flow of water is as follows: 1. Open the Main Drain Valve until it is wide open. Then, check to make sure that a steady full flow of water is discharging from the main drain pipe. 2. Allow the water to flow at full pressure long enough to clear the water of any scale or foreign material. 3. Slowly close the Main Drain Valve. 4. At the Manual Control Station, pull the handle to open the enclosing box, then, while watching the diaphragm actuator gage, slowly pull the interior operating lever down. Water should discharge from the drain tubing to relieve the pressure in the diaphragm actuator line and operate the preaction valve. Note: The preaction valve may also be tested by opening the test valve on the pilot line to simulate the operation of a pilot sprinkler or by applying heat to an electrical detector. SVL500 19

24 5. Record the system water pressure and the diaphragm actuator pressure at the time the valve operated. Compare this data with installation test records. Note: If the diaphragm actuator operating pressure exceeds plus or minus 20% of the operating pressure recorded at initial valve installation, the cause should be determined and the condition corrected (See Maintenance). 6. After the preaction valve operates, allow the water to flow into the system and discharge at the sprinklers or nozzles. Then, check for proper coverage of the protected area. 7. When the flow test is complete, close the System Control Valve and open the Main Drain Valve. 8. After draining the system, thoroughly clean the preaction valve and diaphragm actuator, renew parts as required and reset the valve (see Resetting of System). Testing of Dry Pilot Actuation System The dry pilot actuator, pressure switch and related equipment should be inspected and tested at least annually. The following procedure is recommended. 1. Close the System Control Valve and open the Main Drain Valve. 2. Close the Air (or Nitrogen) Supply Control Valve. 3. Check the operation of the Pressure Switch and Dry Pilot Actuator by slowly opening the Inspectors Test Valve to bleed air (or nitrogen) from the actuation system. Note: The pressure switch should operate to sound a trouble alarm when the dry pilot line pressure drops by 6 psi. With continued loss of pressure, the dry pilot actuator should operate and allow water to discharge to the drain. Note: If the dry pilot actuator should fail to operate, remove it from service and check for obstructions. Clean the device and replace parts as necessary. 4. Close the Inspectors Test Valve and Pilot Line Ball Valve. 5. Inspect the Pilot Line Strainer. If necessary, clean the strainer. 6. Check all low points on the dry pilot line and drain any accumulated condensate. Purge the line if any foreign material is found. 7. To place the actuation system back in service, slowly open the Air Supply Control Valve. Turn the valve to full open when the Pressure Gage indicates a steady pressure. Note: Refer to the Dry Pilot Actuator Pressure Curves for pilot line air pressure setting required for the particular water supply pressure. 8. Slowly open the Pilot Line Ball Valve and restore water pressure on the Diaphragm Actuator and Dry Pilot Actuator. Then, check to be sure that the Clapper Latch is properly engaged on the PreAction Valve Clapper. Note: If the dry pilot actuator should fail to reset, remove it from service and check for obstructions. Clean the device and replace parts as necessary. 9. Slowly open the System Control Valve. When water starts to discharge from the main drain pipe, slowly close the Main Drain Valve. 10. Seal, lock or otherwise secure the System Control Valve in a full open position (per NFPA 25). The system is now ready for service. 11. If alarms connect to a central station or fire department, notify the signal receiving station that the system has been returned to service. Maintenance It is recommended that the Model F PreAction Valve be inspected and tested on a quarterly, semiannual, or annual basis, depending on the ambient conditions present at the valve installation. More frequent inspection and testing may be required if the water supply or ambient conditions are unusually corrosive, or of such a nature as to have an adverse effect on the operation of the valve or fire protection system. Several areas to be routinely inspected are: Clapper/Clapper Latch. After each test, inspection, or before resetting, inspect the clapper and clapper latch mating surfaces. These surfaces must be smooth. Inspect the surface on the end of the latch against which the shaft of the diaphragm actuator presses to hold the clapper closed. This surface must also be smooth. Refinish the clapper nose and clapper latch tail surface using 220 grit sandpaper followed by crocus cloth, to obtain a smooth finish. Clean these surfaces with laquer thinner and allow the surfaces to dry. Inspect the clapper facing, then reinstall the clapper and clapper latch in the valve. Diaphragm Actuator. The diaphragm actuator must be kept free of all foreign matter that could impair its operation. After removing the diaphragm actuator from the valve body, check that the piston stem of the diaphragm actuator is free to move to both ends of its stroke. Flush out any debris inside the diaphragm actuator. If repairs are needed which cannot be accomplished in the field, the device 20 SVL500

25 should be replaced. Clapper Facings. The rubber clapper facings in the preaction and air check valves should be checked for wear or damage, and to determine that they are free of dirt and other foreign substances. If found to be worn or damaged (e.g. foreign matter embedded in the surface), the facings should be replaced. If dirty, they should be cleaned, but compounds which could damage a rubber facing must never be used. Seat Ring. The seat rings in the preaction and air check valves should be cleaned thoroughly and checked for damage. If found to be damaged, the complete valve assembly should be replaced. Alarm Line Strainer, Pilot Line Strainer & Air Supply Strainers. The strainers in the alarm line, pilot line and air supplies should be checked and cleaned thoroughly. Alarm Test Valve & Main Drain Valve. All controlling valves normally closed when the preaction valve is in the set position should be checked to be sure that they are fully closed and not leaking. System Control Valve, Alarm Control Valve, Pilot LIne Ball Valve & Air (or Nitrogen) Supply Control Valves. All controlling valves normally open when the preaction valve is in the set position should be checked to be sure that they are in the fully open position and sealed, where required. Dry Pilot Actuator. The dry pilot actuator must be kept free of all foreign matter that could impair its operation. It should be checked periodically for proper operation and then cleaned as required. If repairs are needed which cannot be accomplished in the field, the device should be replaced. Electric Solenoid Valve. The electric solenoid valve should be checked periodically for proper operation. PreAction Valve & Trim. The overall setup should be checked for visible leaks and possible physical damage to the valve and connections (e.g., broken gages). Air Pressure. Air or nitrogen pressure must be maintained in the system at 24 (10 kpa) ounces per square inch for supervision of the system piping. Lowairpressure alarms should be tested at least semiannually (see Testing of LowAirPressure Alarm Devices). The switch should be checked to see that it is properly set to operate at approximately 8 ounces (3.5 kpa) below the required system pressure. Priming Water Level. The priming water in the air check valve should be checked at least semiannually and maintained at a proper level. Valve Enclosure. The temperature in the enclosure around the preaction valve should be maintained at a temperature above 40 F (4 C). System Low Points. Low points on the preaction system should be drained as often as required to remove any water that has accumulated especially before and during cold weather. The process should be repeated daily until all water is removed. Freezing of even a small amount of water can rupture sprinkler piping. Note: When difficulty in performance is experienced, a qualified service technician or contractor should be contacted before any field adjustment or repair is attempted. Resetting of System After operation, the "Automatic" Model F PreAction Valve must be reset and the system restored to service as soon as possible. 1. Close the System Control Valve (OS& Y, PIV or other ). Caution: In the event of a fire, the system control valve is to be closed only after it has been determined, positively, that the fire has been extinguished. 2. Open the Main Drain Valve and the Auxiliary Drain Valve on the Air Check Valve and allow the system to drain completely. Leave both valves open. Note: If sprinklers have not operated, a means of venting is required to properly drain the system. 3. Close the Supervisory Air Supply Control Valve. 4. Close the Ball Valve in the water supply to the pilot line connections. If a Dry Pilot Actuator is used, also close the Air Supply Control Valve. 5. Open the Auxiliary Drain Valves at system low points and drain completely. 6. If the PreAction Valve operated automatically, restore the actuation system to service. Wet Pilot Actuation. Replace the sprinklers that operated. Dry Pilot Actuation. Replace the sprinklers that operated and restore air pressure to the dry pilot line. Electric Actuation. Reset the detection devices and/ or control panel. 7. If the PreAction Valve was operated from the Manual Control Station, reset the station as follows: Push the operating lever up, close the hinged cover and insert a new break rod in the small hole through the top of the enclosing box. SVL500 21

26 8. Remove the handhole cover from the preaction valve and raise the clapper to a wide open position. 9. Thoroughly clean all interior parts of the valve, including the diaphragm actuator. Check them for freedom of movement. Carefully inspect the Clapper Facing and Seat Ring for damage. Caution: Never use compounds or abrasives on the clapper facing or seat ring. Use bare fingers or cloth to remove grit deposits. Do not scar the seat ring surfaces. 10. Release the Clapper Stop and lower the Clapper to the Seat Ring. Caution: Never use grease or other sealing material on the seat rings. 11. Holding the Clapper down, bring the Clapper latch up into position by opening the Ball Valve to pressurize the Diaphragm Actuator. The Clapper should now be held in the closed position. 12 Replace the Handhold Cover and Gasket, tightening the Cover Bolts (Cap Screws) evenly and securely. 13. Close the Auxiliary Drain Valve on the Air Check Valve and open the Priming Cup Valve. 14. Prime the Air Check Valve by slowly opening the Priming Valve and allowing water to flow into the Priming Cup. Shut the Priming Valve when water starts to fill the cup. Note: To add priming water to the valve, the system piping must be open to atmosphere for example, through an opened sprinkler or low point drain. 15. Slowly open the Auxiliary Drain Valve on the Air Check Valve to remove excess priming water. Close the valve when the water leaves the Priming Cup. Then, close the Priming Cup Valve. 16. Check the Ball Drip for leakage. If there is none, proceed with resetting the system. Note: Priming water must be retained in the air check valve before the system is returned to service. If leakage is observed at the ball drip, the check valve must be opened and cleaned. Replace the clapper facing if it is worn. 17. Replace the sprinklers which have operated and make sure all auxiliary low point drains are closed. 18. Open the Supervisory Air Supply Control Valve and admit air to the system. The Air Pressure Gage will register 24 ounces per square inch (if the pressure regulator is properly adjusted). 19. Again, check the Ball Drip for leakage. If there is none, proceed with resetting the system. Note: If the clapper is tight on the seat ring of the air check valve, the valve will be holding its priming water and no leakage will be found. If leakage is observed, the check valve must be reopened and reinspected. 20. Slowly open the System Control Valve. When water starts to discharge from the main drain pipe, slowly close the Main Drain Valve. 21. Turn the system Control Valve to its full open position. 22. Open the Alarm Control Valve if it has been closed to silence alarms. 23. Conduct a Main Drain Test to make sure the water supply is satisfactory (see Flow Test at Main Drain Valve). 24. Conduct a test of the alarm devices (see Testing Waterflow Alarm Devices). 25. Seal, lock or otherwise secure the System Control Valve and Alarm Control Valve in an open position (per NFPA 25). The system is now ready for service. CAUTION: If alarms connect to a central station or fire department, notify the signal receiving station that the system has been returned to service. 22 SVL500