AUTOMATIC PRESSURE REDUCTION THE VALUE OF ECONOMIZING SOLVING OVERPRESSURE PROBLEMS LEADERSHIP IN ENERGY AND ENVIRONMENTAL DESIGN (LEED)
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- Oswin Fitzgerald
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2 TABLE OF CONTENTS AUTOMATIC PRESSURE REDUCTION Pressure reducing valves are designed to automatically reduce a high inlet suply pressure to a lower outlet pressure. In most plumbing code juris dictions, pressure reducing valves are mandated whenever the supply water pressure exceeds 80 PSI. Excessive pressure can waste as much as 40,000 gallons of water in an average home every year. Ideally, water systems can meet required pressure and capacity needs with a water velocity of 10 feet per second or less. PRODUCT PAGE How Pressure Reducing Valves Work 3 PR Series (36 Series) 4 PRC Series (36C Series) 6 PRE Series (36E Series) 8 PRH Series (36H Series) 10 Installation Configurations 12 Thermal Expansion and By-Pass 12 Low Pressure Models 13 Flow/Performance Curves 13 Gauges 13 Repair Kits 13 THE VALUE OF ECONOMIZING Cutting costs by specifying undersized piping often results in water hammer and other undesirable pipe noises. When correctly designed into an entire supply system, Apollo pressure reducing valves will efficiently control overpressure conditions. Once installed, Apollo pressure reducing valves are engineered to provide years of reliable service. Installing a shut-off valve upstream from the pressure reducing valve makes maintenance and repair easier. In commercial applications, a second shut-off valve and gauge or tapping downstream from the regulator is also suggested. SOLVING OVERPRESSURE PROBLEMS Apollo water pressure reducing valves provide reliable protection from excessive pressure for a wide range of residential, commercial and industrial applications. By eliminating wasteful overpressure, water pressure reducing valves conserve water, reduce related energy costs including the costs of waste water treatment, and extend the life of piping and fixtures while minimizing water hammer shock. LEADERSHIP IN ENERGY AND ENVIRONMENTAL DESIGN (LEED) The Leadership in Energy and Environmental Design (LEED) Green Building Rating System is the nationally accepted benchmark for the design, construction, and operation of high performance buildings. The Apollo pressure reducing valves can be accepted and used to acquire LEED certification. Common practice and analysis shows that 50 psi or lower is sufficient pressure for most homes and commercial buildings. Apollo water pressure reducing valves can help limit the incoming pressure to 50 psi or less to reduce the water being used and to reduce the amount of wastewater returned to the environment. Throughout this catalog, products that have a Lead Free 1 option will be identified with this logo and the following statement applies: 1 LEAD FREE: The wetted surfaces of these products shall contain no more than 0.25% lead by weighted average. Complies with CA AB 1953 and VT S.152. ANSI 3rd party certified & listed. 2 Customer Service
3 HOW PRESSURE REDUCING VALVES WORK OPERATION Apollo pressure reducing valves are shipped in the OPEN position. Their internal seat is held open by a compression spring pushing down. Compression is applied to the pressure spring by an adjusting screw working on a spring button. The standard setting is 50 psig. During static (no-flow) conditions, the valve is closed because the diaphragm force is greater than the valve spring force. The amount of force on the diaphragm by the valve spring determines the outlet the reduced pressure downstream of the regulating valve. Outlet pressure drops once flow begins. The diaphragm senses the pressure drop and force from the spring begins opening the valve. Apollo s internal design enables the regulating valve to react smoothly and quickly to changing flow demands, while protecting against inlet pressure change. As water enters the valve at pressures of 100 psig or more, it flows into the regulator past the open seat, under the diaphragm and through to the outlet pipe, stopping at the closed faucet. Under flow conditions (when the faucet is opened), the captive 50 psig water begins to flow out. Once flow starts, pressure under the diaphragm starts to fall off to below 50 PSI, causing the compression spring to open the seat and allowing more water to enter. Our regulating valve opens, passing only the amount of water flowing out through the faucet at a pressure slightly below the set pressure. REDUCED PRESSURE FALL-OFF Fall-off is the reduced pressure change that results when a valve opens: the difference between the static (closed) pressure and residual (flowing) pressure downstream of the regulating valve. Inherent in the direct-acting design, fall-off is an important factor when choosing a valve size and type. Most often, the regulating valve supplies many fixtures (i.e. toilets, tubs, showers, sinks, etc.) or many industrial applications. Intermittent water demands will vary the flow requirements to the regulating valve widely, from a small trickle to a large volume under peak load. So outlet or downstream pressure from the regulator also varies. Which reducing valve you need depends on the flow rate or capa city required. Pressure reducing valve sizing and selection are important to a successful application. Remember to find out what the MINIMUM inlet pressure is AT THE VALVE. When the reduced pressure on the outlet of a regulator drops too low during flow conditions, the valve or line size is too small for the job. See pages for sizing, selection, and installation guidelines. 3
4 PR Series (36) Water Pressure Reducing Valves FOR GENERAL PURPOSE RESIDENTIAL & LIGHT TO MEDIUM COMMERCIAL APPLICATIONS Apollo PR Series pressure reducing valves provide automatic control of excessive water pressure and problem supply fluctuations. These models are designed to reduce pressures of up to 300 PSI to a more manageable range. Factory set at 50 PSI, they adjust with a turn of a screw. They feature a built-in by-pass and strainer, and comply with ASSE 1003 and CSA B356 standards. They are listed with IAPMO and the City of Los Angeles. PR Series valves are built for long, reliable service with an all-bronze body and high-capacity stainless steel strainer. Available with or without optional pressure gauge tapping. FEATURES All bronze body and cover Integral thermal expansion bypass Suitable for supply pressures to 300 psi Integral stainless steel strainer Every valve is 100% factory set and tested Single and double union options Standard factory setting is 50 psi In-line repairable High and low pressure model options USA materials and manufacture Diaphragm suitable for F Lead-Free 1 option (36LF) Solder, thread, PEX and CPVC Approvals: connection options ASSE 1003 CSA B356 IAPMO City of Los Angeles Model Number Matrix PR - X X X X X X 36 - Union Blank - Single Union D - Double Union T - No Union Part Number Matrix Connection 1 - Single Union NPT 2 - No Union NPT 3 - Single Union Solder x NPT 4 - Double Union NPT 5 - Double Union Solder 6 - Single Union Meter x NPT 8 - Double Union CPVC 9 - Double Union Pex Gauge Blank -No Gauge P - With Gauge Port G - With Gauge Option 0 - No Option C - CPVC Tailpiece S - SS Trim* X - Pex Tailpiece Press. Setting Miscellaneous Size Blank PSIG Blank -No Option 12-1/2 L PSIG A -Stainless Steel Trim* 34-3/4 H PSIG / /2 2-2 X X X X X Size 03-1/2 04-3/ / / Gauge 0 - No Gauge P - With Gauge Port G - With Gauge Pressure PSI Range PSI Range PSI Range * Sealed cage with stainless steel adjusting screw for vault installation. Connection Blank -FNPT x FNPT SINGLE UNION ONLY Blank -FNPT x FNPT S - SOLDER x FNPT C - CPVC x FNPT X - PEX x FNPT DOUBLE UNION ONLY S - SOLDER x SOLDER C - CPVC x CPVC X - PEX x PEX B - BSPT x BSPT SC - SOLDER x CPVC SX - SOLDER x PEX CX - CPVC x PEX Size Connection A (in.) B (in.) C (in.) D (in.) E (in.) F (in.) WT. (Union) (lbs) 1/2 Thread 4 4-7/8 5-5/8 5-7/8 5/8 2-3/4 3.5 Solder 4 4-7/8 5-5/8 5-7/8 1/2 2-3/4 3.4 PEX /4 5-7/8 5/8 2-3/4 3.3 CPVC 4 4-5/8 5-1/4 5-7/8 1/2 2-3/ /4 Thread 3-7/8 4-7/8 5-5/8 5-7/8 5/8 2-3/4 3.4 Solder 3-7/8 4-7/8 5-5/8 5-7/8 3/4 2-3/4 3.3 PEX 3-7/ /4 5-7/8 5/8 2-3/4 3.2 CPVC 3-7/8 4-7/8 5-5/8 5-7/8 5/8 2-3/4 3 1 Thread 4-3/8 5-1/2 6-3/8 6-7/8 5/8 3-3/8 4.5 Solder 4-3/8 5-1/2 6-3/8 6-7/8 5/8 3-3/8 4.4 PEX 4-3/8 5-1/2 6-5/8 6-7/8 7/8 3-3/8 4.3 CPVC 4-3/8 5-3/ /8 3/4 3-3/ /4 Thread 5-3/8 6-1/2 7-1/2 8-7/8 7/ Solder 5-3/8 6-5/8 7-3/4 8-7/ /2 Thread 5-3/8 6-5/8 7-7/8 8-7/8 3/ Solder 5-3/8 6-3/ /8 1-1/ Thread 7-1/8 8-1/2 9-7/8 11-1/ / Solder 7-1/8 8-7/8 10-1/2 11-1/2 1-3/8 5-3/ Customer Service
5 PRESSURE DIFFERENTIAL (PSI) PIPE SIZE *FALL OFF (PSI) Water Capacity (GPM) 1/2" /4" " /4" /2" " PR Series *FALL OFF Fall Off is the difference between the PRV s set pressure and the flowing pressure at any given demand. NOTE: Flow curves are based on static conditions of: Inlet pressure = 100 psig: Outlet pressure = 50 psig. All curves are for female NPT versions only. Pressure fall-off is the pressure by which the outlet pressure drops as flow demand is needed. Item Description 1 Adj. Screw (Zinc Plated Stl.) 2 Hex Nut (Zinc Plated Stl.) 3 Cap (Cast Bronze) 4 Spring Disc (Zinc Plated Steel) 5 Cartridge Bolt 6 Pressure Plate (Zinc Plated Steel) 7 Friction Ring (Zinc Plated Steel) 8 Diaphragm (FDA Nitrile) 9 Stem (Brass) 10 Cartridge Housing (Brass) 11 O-ring (FDA Nitrile) 12 O-ring (FDA Nitrile) 13 Screen (300 Series SS) Item Description 14 Seal, Cartridge (Polypropylene) 15 Seat Ring (300 Series SS) 16 Washer (Brass) 17 Seat Disc (FDA EPDM) 18 Seat Holder (Brass) 19 Washer (Polypropylene) 20 Seat Screw (300 Series SS) 21 Nameplate (Aluminum) 22 Spring (ASTM 228 Music Wire) 23 Body, Machined (Cast Bronze) 24 Union Nut (Cast Bronze) 25 Union Washer (FDA Nitrile) 26 Union Tail Piece (Brass) Note: Jump kits available for 3/4-1-1/4 ONLY. Jump kits 1 and larger include a strainer for use during system flush. No. PRJKT PRJKS PRJKC Connection Threaded Solder CPCV (3/4 & 1 only) JUMP KIT - PR SERIES 5
6 PRC Series (36C) COMPACT DESIGN FOR RESIDENTIAL & LIGHT COMMERCIAL APPLICATIONS Versatile, all-purpose Apollo PRC Series pressure reducing valves handle pressures up to 400 PSI. Compact and with a built-in thermal expansion by-pass, they re designed to protect residential and commercial water distribution systems from excessive pressures. The valves integral thermoplastic cage helps protect the inner adjusting spring from galvanic corrosion. Built for reliable, long-term service, PRC valves offer an all-bronze body, stainless steel strainer and seat. They comply with ASSE 1003 and CSA B356 standards. They are listed with IAPMO and City of Los Angeles. Designed for easy in-line servicing, PRC models come standard with a clean-out plug on the housing s bottom. Both seat disc and strainer can be maintained via the clean-out plug using a 1 1/2 hex socket. Available with or without gauge tapping and gauge. FEATURES Dependable cast bronze body Integral thermal expansion by-pass Suitable for supply pressures to 400 psi Integral stainless steel strainer Every valve is 100% factory set and tested Single and double union options Standard factory setting is 50 psi In-line repairable, bottom access High and low pressure model options USA materials and manufacture Diaphragm suitable for F Lead Free 1 option (36CLF) Solder, thread, PEX and CPVC connection Approvals: options ASSE 1003 Sealed cage with ss adjusting screw for CSA B356 vault installation IAPMO City of Los Angeles Model Number Matrix PRC - X X X X X X Union Blank - Single Union D - Double Union T - No Union Part Number Matrix 36C - X X ( X ) X X X Connection 1 - Single Union NPT 2 - No Union NPT x NPT 3 - Single Union Solder x NPT 4 - Double Union NPT 5 - Double Union Solder 6 - Single Union Meter 7 -Single Union 90 Elbow Meter 9 - Double Union Pex Gauge Press. Setting Miscellaneous Size Connection Blank -No Gauge Blank PSIG Blank -No Option 12-1/2 Blank -FNPT x FNPT P - With Gauge Port L PSIG A - Stainless Steel Trim 31-3/4 SINGLE UNION ONLY G - With Gauge H PSIG 1-1 Blank -FNPT x FNPT S - SOLDER x FNPT C - CPVC x FNPT X - PEX x FNPT E - 90 ELBOW x FNPT Note: Two letter union type offered in double M - METER x FNPT union connection only. Union connections are shipped loose. DOUBLE UNION ONLY S - SOLDER x SOLDER C - CPVC x CPVC X - PEX x PEX B - BSPT x BSPT SC - SOLDER x CPVC SX - SOLDER x PEX CX - CPVC x PEX CE - CPVC x 90 ELBOW SE - SOLDER x 90 ELBOW Size 03-1/2 04-3/ Gauge 0 - No Gauge P - With Gauge Port Plugged G - With Gauge Pressure PSI Range PSI Range PSI Range Option C - CPVC Tailpiece S - Sealed cage X - Extended Union Size Connection A (in.) B (in.) C (in.) D (in.) E (in.) F (in.) WT. (Union) (lbs) 1/2 Thread 3-5/8 4-1/2 5-3/8 6 5/8 2-3/4 3.5 Solder 3-5/8 4-1/2 5-3/8 6 1/2 2-3/4 3.4 PEX 3-5/8 4-1/2 5-1/2 6 5/8 2-3/4 3.3 CPVC 3-5/8 4-1/ /2 2-3/ /4 Thread 3-5/8 4-1/2 5-1/2 6 5/8 2-3/4 3.4 Solder 3-5/8 4-1/2 5-1/2 6 3/4 2-3/4 3.3 PEX 3-5/8 4-5/8 5-5/8 6 5/8 2-3/4 3.2 CPVC 3-5/8 4-1/2 5-1/2 6 5/8 2-3/4 3 1 Thread 3-3/4 4-5/8 5-3/4 6 5/8 3-3/8 4.5 Solder 3-3/4 4-5/8 5-3/4 6 7/8 3-3/8 4.4 PEX 3-3/4 4-3/ /4 3-3/8 4.3 CPVC 3-3/4 4-3/ /16 3-3/8 4 6 Customer Service
7 PRC Series PRESSURE DIFFERENTIAL (PSI) PIPE SIZE FALL OFF (PSI)* Water Capacity (GPM) 1/2" /4" " Model PRC Flow Chart FLOW RATE *FALL OFF Fall Off is the difference between the PRV s set pressure and the flowing pressure at any given demand. Note: Flow curves are based on static conditions of : Inlet pressure = 100 psig: Outlet pressure = 50 psig. All curves are for female NPT versions only. Pressure fall-off is the pressure by which the outlet pressure drops as flow demand is needed. Item Description 1 Adjusting Bolt (Stainless Steel) 2 Nut (Stainless Steel) 3 Tee Nut (Zinc Plated Steel) 4 Cap (G.F. Celcon) 5 Hex Bolt (300 Series SS) 6 Pressure Plate (Brass) 7 Diaphragm (FDA EPDM W/Polyester) 8 Friction Ring (Brass) 9 Cartridge Ret. Washer (Brass) 10 Stem (Brass) 11 O Ring (FDA Nitrile) 12 O Ring (FDA Nitrile) 13 Cartridge Housing (G.F. Noryl) 14 Screen (300 Series SS) 15 O Ring (FDA Nitrile) Item Description 16 O Ring (FDA Nitrile) 17 O Ring (FDA Nitrile) 18 Lock Nut (300 Series SS) 19 Seat Ring (300 Series SS) 20 Seat Disc (FDA EPDM) 21 Disc Holder (Brass) 22 Clean-Out Plug (Brass) 23 Body, Machined (Cast Bronze) 24 Spring Disc (Zinc Plated Steel) 25 Nameplate (Aluminum) 26 Spring (Zinc Plated Music Wire) 27 Union Nut (Brass) 28 Union Washer (FDA Nitrile) 29 Union Tail Piece (Brass) MATERIALS Note: Jump kits available for 3/4-1 ONLY. 1 jump kit includes a strainer for use during system flush. No. PRCJKT PRCJKS PRCJKC Connection Threaded Solder CPCV JUMP KIT - PRC SERIES 7
8 PRE Series (36E) Designed to protect residential and commercial water istribution systems by automatically controlling fluctuating supply pressures. The dezincification resistant bronze body and dielectric polymer cage provide maximum corrosion resistance. Designed for easy in-line servicing with simple cartridge removal. FEATURES Balanced piston design Sealed cage for vault installations Built-in thermal expansion by-pass Integral stainless steel strainer Modular seat disc and strainer cartridge Control pressure ranges: psi and psi NPT, solder, PEX, CPVC and press and push connections Maximum supply pressure: 400 psig Working temperature range: 33 F-180 F 100% manufactured in USA Material Specifications Part Name Body Tailpiece Screen Spring Housing Diaphragm Seat Disc Stem/Adjusting Screw Spring O-Rings Material Bronze, ASTM B584 Brass, ASTM B16 Stainless Steel Acetal EPDM FDA Grade EPDM Stainless Steel Music Wire ASTM A228 EPDM Connect Size Dimensions (in) Wt. (Union) Type (in.) A B C D E F (lbs.ea) Thread 1/2 3-5/8 4-1/2 5-3/8 6 5/8 2-3/4 3.5 Solder 1/2 3-5/8 4-1/2 5-1/2 6 1/2 2-3/4 3.4 PEX 1/2 3-5/8 4-1/2 5-1/2 6 5/8 2-3/4 3.3 CPVC 1/2 3-5/8 4-1/ /2 2-3/4 3.1 Thread 3/4 3-5/8 4-1/2 5-1/2 6 5/8 2-3/4 3.4 Solder 3/4 3-5/8 4-1/2 5-1/2 6 3/4 2-3/4 3.3 PEX 3/4 3-5/8 4-5/8 5-5/8 6 5/8 2-3/4 3.2 CPVC 3/4 3-5/8 4-1/2 5-1/2 6 5/8 2-3/4 3.0 Thread 1 3-5/8 4-5/8 5-3/4 6 5/8 3-3/8 4.5 Solder 1 3-5/8 4-5/8 5-3/4 6 7/8 3-3/8 4.4 PEX 1 3-5/8 4-3/ /4 3-3/8 4.3 CPVC 1 3-5/8 4-3/ /16 3-3/ Customer Service
9 PRE Series PRESSURE DIFFERENTIAL (PSI) PIPE SIZE FALL OFF (PSI)* Water Capacity (GPM) 1 /2" /4" " FLOW RATE *FALL OFF Fall Off is the difference between the PRV s set pressure and the flowing pressure at any given demand. Part Number Matrix 36E - 1 X X X X 36E - Standard 36ELF - Lead Free Style Union 0 - No Union NPT 1 - Single Union 2 - Double Union Size 3-1/2 4-3/4 5-1 Pressure PSI Connection T - FNPT Thread S - Solder C - CPVC P - Push X - PEX PR - Press Customer Service
10 PRH Series (36H) SUPER CAPACITY FOR COMMERCIAL, INSTITUTIONAL & INDUSTRIAL APPLICATIONS Model Number Matrix PRH - DIMENSIONS Dimensions (in.) Weights (lbs.) Connections T - FNPT x FNPT F - Flanged Apollo PRH Series pressure reducing valves offer high performance in heavy-duty applications. They re designed with a larger diaphragm and orifice area to yield the highest water flow water capacities in the industry. PRH pressure reducing valves integral by-pass protects against thermal expansion. Built for extended service, these models include bronze body construction and stainless steel replaceable seat. They are designed to meet ASSE, CSA and IAPMO standards. These heavy-duty valves are available with optional in-line strainer and ANSI 150# integral bronze flange connections. (2-1/2 and 3 only) FEATURES Bronze body and spring cage for superior Diaphragm suitable for F corrosion resistance and dependability Integral thermal expansion by-pass SS fasteners, spring, seat, and adjustment In-line repairable, bottom access screw USA materials and manufacture Suitable for supply pressures to 400 psi Lead Free 1 option (36HLF) Every valve is 100% factory set and tested Approvals: Standard factory setting is 50 psi ASSE 1003 CSA B356 IAPMO City of Los Angeles X X X Miscellaneous Standard - No Strainer Y - With Strainer Note: ANSI 150 lb. flange connection for 2-1/2 and 3 only. Not all variations are available in each size. Check with customer service. * Can be adjusted psig. Pressure Setting Standard psig L psig H psig* Part Number Matrix 36H - X X X - 0 X End Connections 2 - FNPT x FNPT (Standard) 7 - Flanged (2-1/2-3 only) Options 0- Standard 1 - With Y-Strainer Size 3-1/2 4-3/ / / /2 0-3 Pressure Range psig (Standard) psig psig X Size 1/2 3/ /4 1-1/ /2 3 Size Wt. With Wt. Without (NPT) A B C D E F Strainer Strainer 1 /2" 4 1 /8 2 1 / /8 8 3 / /4" 4 1 /8 2 1 / / " 4 13 / / / / / /4" 6 3 /4 3 3 / / /2 6 1 / /2" 6 3 /4 3 3 / / /8 6 1 / " 8 1 /8 3 1 / /2 4 5 / / /2" 8 1 /8 3 1 / / / / / " 10 3 / / / / /2 9 3 / Flanged 2 1 /2" 10 3 /8 3 1 / /2 7 1/ / / " 12 1 / / /8 8 1 / /2 9 3 / Customer Service
11 PRESSURE DIFFERENTIAL (PSI) PIPE SIZE *FALL OFF (PSI) Water Capacity (GPM) 1 /2" /4" " /4" /2" " /2" " Model PRH Flow Chart FLOW RATE *FALL OFF Fall Off is the difference between the PRV s set pressure and the flowing pressure at any given demand. Note: Flow curves are based on static conditions of : Inlet pressure = 100 psig: Outlet pressure = 50 psig. All curves are for female NPT versions only. Pressure fall-off is the pressure by which the outlet pressure drops as flow demand is needed. Item Description 1 Body (Bronze) 2 Seat (SS) 3 Seat O-Ring (Nitrile) 4 By-Pass Assembly 5 Yoke (Bronze) 6 Diaphragm (Nitrile W/Nylon Reinforcement) 7 Diaphragm Washer (SS) 8 Diaphragm Nut (SS) 9 Spring (SS) 10 Spring Retainer (SS) Note: Materials specified for 1 /2" thru 2" only. Item Description 11 Cap (Bronze) 12 Cap Bolts (SS) 13 Lock Nut (SS) 14 Adjustment Screw (SS) 15 Seat Disc Holder (Bronze) 16 Seat Disc (EPDM) 17 Seat Disc Washer (SS) 18 Seat Screw (SS) 19 Bottom Cover (Bronze) 20 Bottom Cover O-Ring (Nitrile) 21 Cage-Sealing Washer (SS) MATERIALS 11
12 Installation Configurations For high pressure step-down. For high/low flow requirements. SIZING WPRV 1. WHAT IS THE SUPPLY PRESSURE? 2. WHAT IS THE DESIRED REDUCED DOWNSTREAM PRESSURE? The reduced pressure prevents damage to water fixtures and downtream piping. Optimal performance is achieved at a 2:1 ratio. Example: 100 psi supply pressure, 50 psi static downstream pressure. 50 psi is the default factory setting. Multiple valves should be used for large pressure drop requirements. 3. WHAT IS THE CALCULATED FLOW REQUIREMENT MINIMUM & MAXIMUM? Do not size for maximum flow requirement. An over sized valve will operate in a nearly closed position causing premature wear and undesireable noise. If normal flow requires a line size regulator, a smaller regulator, piped parallel to the main regulator should be considered. Adjusting the smaller bypass regulator at 5-10 psi higher than the main regulator will help prevent premature wear and noise. 4. SIZE FOR PSI FALL OFF (EXAMPLES CAN BE FOUND IN CHART) Falloff is normal. As flow increases, pressure decreases. As flow decreases, pressure increases. Low flow at high pressure forces the valve to operate in a near closed position. Sizing at psi falloff will allow the valve to operate nearer the middle of its operating range. Mid range improves performance and durability. THERMAL EXPANSION CONSIDERATIONS Installing a pressure reducing valve creates a closed water system. Thermal expansion occurs in a closed system when water is heated and pressure builds up. A thermal by-pass designed into the reducing valve can dissipate the expanded pressure back to the service main. When the system pressure in a closed system increases to a pressure greater than the supply pressure by just one pound, the o-ring on the stem will flex (see Fig. A) and allow the excess pressure to be relieved to the supply side until pressures on both the system and supply sides are equal. When a faucet on the system side in used, thus lowering the pressure, the valve opens as soon as the system pressure falls below the set outlet pressure, typically 50 lbs. The valve and the system then return to normal as shown in Fig. B above. The PRVH features a ball and seat type of check valve as a thermal by-pass but the principle is similar. 12 Customer Service
13 SPECIALLY DESIGNED LOW PRESSURE MODELS Apollo s low pressure reducing valves are designed to provide optimal performance low pressure (10 to 35 PSI) for residential and commercial applications. They feature a heat-resistant diaphragm for extended-term performance in automatic dishwashers, booster heaters and similar applications. FLOW/PERFORMANCE CURVES Apollo offers performance curves for every version of its PR Series pressure reducing valves. All curves plot the rate of flow against the reduced pressure fall-off. Specially Designed for Low Pressure Models In all charts, zero (0) indicates a no-flow condition. Figures below zero on the flow curve chart show the pressure change or fall-off needed to produce the flows indicated by the curves for valves of different sizes. It is important to allow for some fall-off from the set pressure downstream during flow conditions. Example: A PRC 3/4 with an inlet pressure of 100 psi is set to an outlet pressure of 50 psi in the static, no-flow condition. The flow demand through the valve is expected to be 19 gpm. The chart below shows that the fall-off at that flow rate is 18 psi, so the pressure will drop from 50 psi to about 32 psi at 19 gpm. Although this chart shows curves at a 50 psi differential, curves for other settings are similar. The curve shifts slightly to the left for a smaller differential and to the right for a greater differential. For every model and size, the amount of water passed through the valve depends on the difference between the inlet pressure and the outlet pressure. As the pressure differential increases, the volume of water increases. Reduced pressures must drop off slightly from the setting of the valve as flow starts. As flow increases, the pressure must continue to fall. Required capacity depends entirely on where and how the valve is used. In typical systems where water is supplied to lavatories, toilets, bath tubs and showers in homes, schools, apartments hospitals, a 25 to 30 percent pressure drop-off is satisfactory. In laundries, car washes, commercial dishwashers and other industrial and commercial applications, a 10 to 15 percent pressure drop-off may be preferred. Generally, the greater the output variation, the higher the valve s capacity. A larger valve will offer more capacity with less pressure fall-off than a smaller valve of the same model. Also valve capacities can vary depending on the size of the piping. Apollo pressure reducing valves offer a wide range of performance; selecting the best valve for the application depends on more than pipe size alone. The Apollo technical staff is available to assist you. GAUGES Apollo offers the gauges necessary for proper selection, use and maintenance of pressure reducing valves. The hose bibb maximum pressure indicator gauge or pressure test gauge is used in determining the need for pressure reducing valves and the amount of reduction necessary. This gauge is attached to a hose bib or sill cock which is then turned to full open position. The gauge is left in place for a period of time, usually over night, to record the maximum pressure level at that location. Hose Bibb An outlet pressure gauge allows a quick visual check of outlet water pressure. These gauges are often installed permanently so that any unexpected increase or decrease in pressure can be detected and dealt with before it results in damage to the system. Apollo offers a 2" outlet pressure gauge as an option on the PRC. Both types of gauges are available from your Apollo distributor. REPAIR KITS AVAILABLE Repair parts are available for all Apollo pressure reducing valves. Convenient pre-packaged repair kits for each model are also available. Gauge W To learn more about Apollo water pressure reducing valves, or to place an order, see your Apollo distributor. Or contact the Apollo Customer Service Department at (704) ; Fax: (704) or online at Outlet Pressure Gauge 13
14 Warranty and Terms and Conditions of Sale Terms and Condition of Sale Payment: 2% 10th prox. Net 30 days. All prices F.O.B. Matthews, N.C., or Pageland, S.C., with freight allowed on shipments of 750 pounds or $5,000 net and over to all shipping points within the United States excluding Alaska and Hawaii. No freight allowed on Air Freight or Parcel Post shipments. Claims for shortages must be made within 10 days of receipt of material. Our responsibility ends when a receipt is furnished us by the carrier. No Invoice Rendered For Less Than $ No freight will be allowed on Air Freight, Air Express, Parcel Post or U.P.S. shipments.other Conbraco Products may be combined to make sufficient weight for full freight allowance. Phone order quoted prices are subject to correction. Prices and designs are subject to change without notice. Orders for material or special design or specification are made to customer s order and are not subject to cancellation or return. Goods returned to us will not be accepted unless a full explanation has been made and our written authorized permission obtained. All goods returned if accepted will be credited at invoice price, less 30% for service and rehandling charges, plus shipping expenses.we reserve the right to adjust orders to box quantities. Warranty & Limitations of Liability Conbraco Industries, Inc. warrants, to its initial purchaser only, that its products which are delivered to this initial purchaser will be of the kind described in the order or price list and will be free of defects in workmanship or material for a period of FIVE years from the date of delivery to you, our initial purchaser. This extended warranty applies to Apollo brand product with Made in the USA markings only. Other products are subject to a two year warranty. Should any failure to conform to this warranty appear within the warranty period from the date of the initial delivery to our initial purchaser, Conbraco will, upon written notification thereof and substantiation that the goods have been stored, installed, maintained and operated in accordance with Conbraco's recommendations and standard industry practice, correct such defects by suitable repair or replacement at Conbraco's own expense. THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHER WARRANTY OF QUALITY, WHETHER EXPRESSED OR IMPLIED, EXCEPT THE WARRANTY OF TITLE AND AGAINST PATENT INFRINGEMENT. Correction of non-conformities, in the manner and for the period of time provided above, shall constitute fulfillment of all liabilities of Conbraco to our initial purchaser, with respect to the goods, whether based on contract, negligence, strict tort or otherwise. It is the intention of Conbraco Industries, Inc. that no warranty of any kind, whether expressed or implied shall pass through our initial purchaser to any other person or corporation. LIMITATION OF LIABILITY: Conbraco Industries, inc. SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE FOR SPE- CIAL OR CONSEQUENTIAL DAMAGES SUCH AS, BUT NOT LIMITED TO, DAMAGES OR TO LOSS OF OTHER PROPER- TY OR EQUIPMENT, LOSS OF PROFITS OR REVENUE, COST OF CAPITAL, COST OF PURCHASED OR REPLACEMENT GOODS, OR CLAIMS OF CUSTOMERS OF OUR INITIAL PURCHASER. THE REMEDIES OF OUR INITIAL PURCHASER, AND ALL OTHERS, SET FORTH HEREIN, ARE EXCLUSIVE, AND THE LIABILITY OF CONBRACO WITH RESPECT TO SAME SHALL NOT, EXCEPT AS EXPRESSLY PROVIDED HEREIN, EXCEED THE PRICE OF THE GOODS UPON WHICH SUCH LIABILITY IS BASED. 14 Customer Service
15 Notes Customer Service
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RELIABLE PROTECTION FOR A WIDE RANGE OF RESIDENTIAL, COMMERCIAL AND INDUSTRIAL APPLICATIONS. water pressure reducing valves
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