Types S108K and S109K Pressure Reducing Regulators with Integral Slam-Shut Device

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1 Instruction Manual Form 5492 Types S108K and S109K May 1999 Types S108K and S109K Pressure Reducing Regulators with Integral Slam-Shut Device Introduction Fisher regulators must be installed, operated and maintained in accordance with federal, state, and local codes, rules and regulations, and Fisher instructions. For LP-Gas service, an approved regulator (such as one listed by U.L.) should be used. The installation, in most states, must comply with NFPA standards. If the regulator vents gas or a leak develops in the system, service to the unit may be required. Failure to correct the problem could result in a hazardous condition. Scope of Manual This manual provides instructions for the installation, adjustment, maintenance, and parts ordering for the Types S108K and S109K pressure regulators with an integral slam-shut device. Description Types S108K and S109K direct-operated, springloaded regulators provide economical pressure reducing control in a variety of residential, commercial, and industrial applications. These regulators can be used with natural, manufactured, or liquified petroleum gases. Both regulators have an integral slam-shut device that provides overpressure protection by completely shutting off the flow of gas to the downstream system in case of overpressure. The slam- W7471 Figure 1. Type S108K or S109K Pressure Regulator shut is equipped with an integral bypass and internal pressure registration. The slam-shut device s actions are independent of the regulator and of variations to inlet pressure. In addition, the Type S109K regulator has token internal relief across the diaphragm to help minimize minor overpressure conditions, such as thermal expansion. Any outlet pressure above the start-todischarge point of the nonadjustable relief valve spring moves the diaphragm off the relief valve seat, allowing excess pressure to bleed out through the screened spring case vent. Specifications Specifications and ratings for Types S108K and S109K constructions are listed in the Specifications section on page 2. The following information is located on the closing cap: type number, orifice size, spring range, date of manufacture, and the slam-shut trip point. D102672X012

2 Specifications Available Configurations Type S108K: Service regulator without internal relief Type S109K: Service regulator with token internal relief Body Sizes and End Connection Style (1) 3/4-inch (DN 20), 3/4 x 1-inch (DN 20 x 25), or 1-inch (DN 25) NPT screwed Allowable Inlet Pressures (1) Maximum Emergency: 150 psig (10,3 bar) Maximum Operating Pressure: See table 1 Allowable Outlet Pressures (1) Maximum Emergency (Casing): 25 psig (1,7 bar) Maximum Operating Pressure to Avoid Internal Parts Damage: 3 psi (0,21 bar) above outlet pressure setting Type S109K Approximate Start-To-Discharge Point (With Standard Relief Valve Spring) 6 to 12-inches w.c. (15 to 30 mbar) above setpoint Outlet Pressure Ranges See table 2 Slam-Shut Pressure Ranges See table 3 Pressure Registration Internal Type S109K Internal Relief Performance The Type S109K has a token internal relief valve for relief of minor overpressure conditions, such as thermal expansion. Temperature Capabilities (1) Main Valve: -20 to 160 F (-29 to 77 C) Slam-Shut Device: -20 to 140 F (-29 to 60 C) Spring Case Vent Connection Main Valve: 3/4 or 1-inch NPT Slam-Shut Device: 1/4-inch NPT Approximate Weight 6 pounds (2,7 kg) 1. The pressure/temperature limits in this instruction manual, and any applicable code or standard limitations, should not be exceeded. Table 1. Maximum Inlet Pressures and Flow Coefficients ORIFICE SIZE, I NCH ( mm) 3/16 1/4 5/16 7/16 (4,8) (6,4) (7,9) (11,1) WIDE-OPEN FLOW MAXIMUM OPERATING INLET PRESSURE TO OBTAIN COEFFICIENTS C 1 GOOD REGULATING PERFORMANCE, PSIG ( b ar) C g C v 3.5 to 28-Inches w.c. (8,5 to 70 mbar) 1 to 2.5 psig (69 to 172 mbar) (4,1) (1,4) (0,83) (0,34) (4,1) (2,8) (1,4) (0,55) Table 2. Outlet Pressure Ranges OUTLET PRESSURE RANGE 3.5 to 5.5-inches w.c. (8,5 to 13,8 mbar) 5.5 to 8.5-inches w.c. (13,8 to 21,3 mbar) 8 to 15-inches w.c. (20 to 38 mbar) 14 to 28-inches w.c. (35 to 70 mbar) 1.5 to 2.5 psig (103 to 172 mbar) SPRING PART NUMBER 1E E E K T SPRING COLOR Red Olive drab Green Gray Blue SPRING WIRE DIAMETER, INCH ( c m) (0,137) (0,170) (0,203) (0,229) (0,277) SPRING FREE LENGTH, INCHES ( c m) 3.50 (8,89) 3.50 (8,89) 3.28 (8,33) 3.34 (8,48) 3.65 (9,27) Table 3. Slam-Shut Pressure Ranges SLAM-SHUT PRESSURE RANGE 16 to 32-inches w.c. (40 to 80 mbar) 24 to 84-inches w.c. (60 to 210 mbar) 2.3 to 5.8 psig (160 to 400 mbar) SPRING PART NUMBER FA142662T12 FA142663T12 FA142664T12 SPRING COLOR Red White Blue SPRING WIRE DIAMETER, INCH ( m m) 0.05 (1,2) 0.06 (1,5) 0.08 (2,0) SPRING FREE LENGTH, INCHES ( mm) 1.3 (32) 1.3 (32) 1.3 (32) 2

3 A7262 TYPE S108K OPERATIONAL SCHEMATIC ATMOSPHERIC PRESSURE INLET PRESSURE OUTLET PRESSURE A7263 TYPE S109K OPERATIONAL SCHEMATIC Figure 2. Types S108K and S109K Regulator Operational Schematics Principle of Operation Main Valve Operation Refer to figure 2. When downstream demand decreases, the pressure under the diaphragm increases. This pressure overcomes the regulator setting (which is set by a spring). Through the action of the pusher post assembly, the valve disk moves closer to the orifice and reduces gas flow. If demand downstream increases, pressure under the diaphragm decreases. Spring force pushes the pusher post assembly downward and the valve disk moves away from the orifice. Type S109K regulators include a token internal relief valve for relief of thermal expansion. The token relief valve opens to vent minor overpressure caused by thermal expansion. Slam-Shut Operation The shutoff disk of the slam-shut device is held in the open position by a small ball holding the disk stem. If the pressure below the diaphragm increases reaching the slam-shut setpoint, the diaphragm will travel upwards that in turn releases the ball. Once the ball is released, the spring force on the stem will push the stem and disk to the closed position against the seat, shutting off the downstream gas flow. When tripped, the slam-shut has to be manually reset. The manual reset has an internal bypass to equalize the reset pressure on either side of the shutoff disk. Installation Personal injury, equipment damage, or leakage due to escaping gas or bursting of pressure-containing parts might result if these regulators are overpressured or installed where service conditions could exceed the limits for which the regulators were designed, or where conditions exceed any ratings of the adjacent piping or piping connections. To avoid such injury or damage, provide pressure-relieving or pressure-limiting devices to prevent service conditions from exceeding those limits. Additionally, physical damage to a regulator could cause personal injury and 3

4 BASEMENT TO APPLIANCE VENT LINE VENT ASSEMBLY To obtain the maximum flow capacities or other performance characteristics, the length of pipe from the regulator outlet to the meter or for the first 18 inches (457 mm), whichever is closer should have no bends and should be the same size as the regulator outlet. Replace the regulator if water gets into the spring case or the lower casing of the regulator. Types S108K and S109K regulators have a 3/4 or 1-inch NPT spring case vent and the slam-shut device has a 1/4-inch NPT vent which are screened to prevent insects or foreign material from entering. If necessary to vent escaping gas away, install separate remote vent lines in the spring case and slam-shut ports. B2497 Figure 3. Typical Vent Line Installation property damage due to escaping gas. To avoid such injury and damage, install the regulator in a safe location. A regulator or slam-shut may vent some gas to the atmosphere in hazardous or flammable gas service, vented gas might accumulate and cause personal injury, death or property damage due to fire or explosion. Vent a regulator or slam-shut in hazardous gas service to a remote, safe location away from air intakes or any hazardous location. The vent lines must be protected against condensation or clogging. The regulator and slam-shut must have separate vent lines. Under enclosed conditions or indoors, escaping gas may accumulate and be an explosion hazard. In these cases, the vent should be piped away from the regulator to the outdoors. Before installing the regulator, check for damage which might have occurred in shipment. Also check for dirt or foreign matter which may have accumulated in the regulator body or in the pipeline. Apply pipe compound to the male threads of the pipeline and install the regulator so that the flow is in the direction of the arrow on the side of the body. The diaphragm casing assembly can be rotated to any position relative to the body in 90 increments. Remove the cap screws that hold the body to the actuator to rotate the diaphragm casing assembly. Do not install the regulator in a location where there can be excessive water accumulation, such as directly beneath a downspout or in an undrained pit. You are advised to use new vent piping because defective threads on the relief vent piping may interfere with the venting assembly if the piping obstructs the movement of the vent flapper. Vent piping should be as short and direct as possible with a minimum number of bends and elbows. The remote vent lines should have the largest practical diameter. Vent piping on the Type S109K with token internal relief must be large enough to vent all discharge to atmosphere without excessive backpressure and resulting excessive pressure in the regulator. Install weather and insect resistant vent assemblies on the outside end of the vent pipes, such as Fisher Type Y602. The same installation precautions apply to vent assemblies as the integral regulator vents. A program of regular inspection of the vent opening should be established to see that it has not become plugged by foreign material. On some installations, such as in areas of heavy snowfall, it may be necessary to install the regulator beneath a protective hood. If other protection is provided from the elements, the vent should be pointing or sloping down sufficiently to allow any condensate to drain. Also check the regulator periodically for external or internal corrosion. Overpressure Protection Some type of overpressure protection is needed if actual inlet pressure can exceed the outlet pressure rating. Overpressuring any portion of this equipment above the limits given in the Specifications section may cause damage to regulator parts, leaks in the regulator, or personal injury 4

5 due to bursting of pressure-containing parts or explosion of accumulated gas. If the regulator is exposed to an overpressure condition, it should be inspected for any damage that may have occured. Operation below these limits does not preclude the possibility of damage from external sources or debris in the pipeline. Type S109K regulators provide token internal relief that limits the outlet pressure buildup over setpoint. This internal relief for protection against minor overpressure caused by thermal expansion. Regulators should be inspected for damage after any overpressure condition. Startup downstream pressure while adjustments are being made. Do not adjust the spring to produce an outlet pressure setting above the limit stamped on the closing cap. If the required pressure setting is not within the range of the spring being used, substitute with the correct spring. When changing the spring, also change the range stamped on the closing cap. If the outlet pressure range is changed, the slam-shut range must be changed accordingly. Slam-Shut Adjustment The slam-shut spring may be adjusted with the regulator in the line. Adjust the shutoff spring (key 3, figure 6) to its maximum compression. Apply downstream pressure equal to the desired trip point. Reduce the trip spring compression until the slam-shut trips. Note To avoid personal injury or property damage due to explosion or damage to regulator or downstream components during startup, release downstream pressure to prevent an overpressure condition on the diaphragm of the regulator. In order to avoid an overpressure condition and possible equipment damage, pressure gauges should always be used to monitor pressures during startup. 1. Make sure the downstream shutoff valve is closed. 2. Check to see that all appliances are turned off. 3. The regulator is shipped with the slam-shut device in the tripped position. To reset the slam-shut, follow the procedure under Manual Reset in the Slam-Shut Maintenance section. 4. Slowly open the upstream shutoff valve. 5. Slowly open the downstream shutoff valve 6. Check all connections for leaks. 7. Make final control spring adjustments following the Outlet Pressure Adjustment procedure. 8. Light the appliance pilots. Outlet Pressure Adjustment To increase the outlet pressure setting of the regulator, the adjusting screw (key 3, figures 4 and 5) must be turned clockwise. To reduce the outlet pressure setting, turn the adjusting screw counterclockwise. A pressure gauge should always be used to monitor When selecting a slam-shut spring range, a minimum differential of 12-inches w.c. (30 mbar) between the normal operating pressure and the shutoff pressure is recommended. Shutdown To avoid personal injury or property damage due to explosion or damage to regulator or downstream components during shutdown, release downstream pressure to prevent an overpressure condition on the regulator diaphragm. Installation arrangements may vary, but in any installation it is important that the valves be opened or closed slowly. The steps below apply to the typical installation. 1. Slowly close the downstream shutoff valve. 2. Slowly close the upstream shutoff valve. 3. Open vent valves downstream of the regulator. 4. Open vent valves upstream of the regulator. Maintenance Avoid personal injury or damage to property from sudden release of pres- 5

6 sure or uncontrolled gas or other process fluid. Before starting maintenance, isolate the regulator from all pressure and cautiously release trapped pressure from the regulator. Use gauges to monitor inlet and outlet pressures while releasing these pressures. Main Valve Maintenance These procedures are for gaining access to the diaphragm, valve disk, and orifice. Release all pressure from the diaphragm casing before performing the following steps. While using the following procedures, refer to figures 4 and 5 for key number locations. Diaphragm Replacement 1. Remove the closing cap (key 4) and adjusting screw (key 3). 2. Remove the spring case cap screws (key 14) out of the spring case (key 1), and remove the spring case and control spring (key 2). 3. Lift the diaphragm assembly (key 7) slightly, and slide it away from the lever (key 10a), so that the pusher post (key 8) releases the lever. 4. On the Type S108K, remove the screw (key 12, figure 4). On the Type S109K, remove the relief valve spring retainer (key 24, figure 5), then remove the relief valve spring (key 25, figure 5). 5. Remove and inspect the diaphragm assembly (key 7), replace if necessary. 6. Reassemble in the reverse order of the above steps. Before attaching the screw (key 12, figure 4) on the Type S108K or relief valve spring retainer (key 24, figure 5) on the Type S109K to the pusher post (key 8) to secure the new diaphragm assembly, place the loosely assembled diaphragm into position in the lower casing (key 9), being sure the pusher post is properly hooked on the lever (key 10a). Rotate the diaphragm so that the diaphragm and lower casing holes align. Tighten the screw (key 12, figure 4) or install the relief valve spring retainer (key 24, figure 5) and then reassemble. Tighten the spring case cap screws (key 14) using 15 to 25 inch-pounds (1,7 to 2,8 N m) of torque. Valve Disk and Orifice Replacement 1. Remove the cap screws (key 18) which hold the lower casing to the body (key 21). 2. The regulator can be removed from the body, exposing the disk (key 16) and the orifice (key 20). 3. Examine the disk. If it is nicked, cut, or otherwise damaged, the disk (key 16) should be removed from the valve stem (key 10b) and replaced with a new part. 4. Examine the seating edge of the orifice (key 20). If it is nicked or rough, it should be unscrewed from the body with a thin wall 7/8-inch socket wrench and replaced with a new orifice to provide proper shutoff. Treat the male threads of the new orifice with lubricant before reassembling and install using 35 to 45 footpounds (48 to 61 N m) of torque. 5. Reassemble in reverse order of the above steps. Tighten the cap screws (key 18) using 75 to 100 inchpounds (8,5 to 11,3 N m) of torque. Slam-Shut Maintenance The slam-shut device (figure 6) is designed to be removed as a unit from the regulator body and replaced as a complete unit. The trip pressure spring may be adjusted or the spring can be replaced without removing the slam-shut from the main body. All pressure must be released from the device before the following steps can be performed. The replacement parts in the slam-shut device are the upper and lower O-rings (keys 4 and 5) and the shutoff spring (key 3). Check the O-rings for nicks, cracks, etc. every time the slam-shut device is removed from the main valve body. Replace the O-rings as necessary. Manual Reset Each time the slam-shut device is tripped, it must be manually reset. Before resetting the slam-shut, find and correct the reason for the overpressure condition. Follow the steps below to reset the slam-shut device: 1. Slowly unscrew the reset knob. The internal bypass allows the pressure inside the slam-shut and the regulator to equalize while the knob is being unscrewed. 2. Pull out the reset knob out until it stops. 3. Push the reset knob back into the slam-shut. 4. Tighten the knob. Parts Ordering The type number, orifice size, spring range, date of manufacture and, and the slam-shut trip point are stamped on the closing cap. Provide this information in any correspondence with your Fisher Sale Office or Sales Representative. 6

7 A7265 Figure 4. Type S108K Main Valve Assembly A7266 Figure 5. Type S109K Main Valve Assembly 7

8 Parts List Main Valve (figures 4 and 5) Key Description Part Number 1 Spring case assembly S108K with 3/4-inch vent T80449T0032 S108K with 1-inch vent T80449T0042 S109K with 3/4-inch vent T80449T0012 S109K with 1-inch vent T80449T Control spring, Zinc-plated steel 3.5 to 5.5-inches w.c. (8,5 to 13,5 mbar) 1E to 8.5-inches w.c. (13,8 to 21,3 mbar) 1E to 15-inches w.c. (20 to 38 mbar) 1E to 28-inches w.c. (35 to 70 mbar) 1K to 2.5 psig (103 to 172 mbar) T Adjusting screw, Delrin (1) For all springs except T T10610X0012 For spring T E Closing cap T20118X Lower spring seat Type S108K 1E Type S109K T14093T0012 7* Diaphragm assembly, Nitrile/plated steel T20970T Pusher post Type S108K, Aluminum 2E Type S109K, Delrin T40378T Lower casing, Aluminum T21061T a Lever, Plated steel T13729T b Stem, Aluminum T13730T Pin, Stainless steel 1E Screw, Steel (Type S108K only) 1E Screw, Steel (8 required) T13526T * Disk T13731T Cap screw, Steel (2 required) (not shown) 1E Gasket, Neoprene T Orifice, Aluminum 3/16-inch (4,8 mm) 1/4-inch (6,4 mm) 5/16-inch (7,9 mm) 7/16-inch (11,1 mm) 1F T13507T0012 1E9862X0012 0L Body, Ductile iron 3/4-inch T21047T0012 3/4 x 1-inch T21048T inch T21049T Vent screen, Stainless steel T RESET KNOB A7267 Figure 6. Slam-Shut Device Assembly Key Description Part Number 24 Relief valve spring retainer, Steel (Type S109K only) T13039T Relief valve spring, (Type S109K only) T13785T Stem guide, white T80344T Flow arrow (not shown) 1V Drive screw (not shown) 1A Slam-Shut Device (figure 6) Key Description Part Number 1 Slam-shut module FA196258T12 2 Hex cap screw (2 required) 1E Shutoff spring 20 to 32-inches w.c. (50 to 80 mbar) FA142662T12 24 to 84-inches w.c. (60 to 210 mbar) FA142663T to 5.8 psig (160 to 400 mbar) FA142664T12 4* Upper O-ring 10A3802X012 5* Lower O-ring 11A8741X052 * Recommended Spare Part 1. Trademark of E.I. DuPont Nemours Co. Fisher is a mark owned by Fisher Controls International, Inc., a business of Emerson Process Management. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their respective owners. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice. Fisher does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Fisher product remains solely with the purchaser. For information, contact Fisher: Marshalltown, Iowa USA McKinney, Texas USA Gallardon, France Castel Maggiore (BO), Italy Sao Paulo Brazil Singapore Fisher Controls International, Inc., 1999; All Rights Reserved

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