Relief Valves

30 result(s) for "Relief Valves"
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Cash Acme 3/4 in. Vacuum Relief Valve
Cash Acme 3/4 in. Vacuum Relief Valve
Item # 151838

The VR-801 Vacuum Relief Valve is designed to protect hot water supply systems and pressure vessels against negative pressure. Installed on the cold water supply line, the Cash Acme VR-801 closes tightly under pressure and opens at a 1 in. mercury vacuum. Atmosphere admitted to the system breaks the vacuum, preventing collapse of the storage tank.

  • Brass body
  • Silicone seat disc
  • Prevents internal vacuum conditions
  • Guards against siphonage
  • Opens quickly in emergency situations
  • Every valve is tested for performance prior to shipping
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Watts Automatic Vent Valve, 1/8 in. Male NPT Connection, Brass Body, Silicone Rubber Seal
Watts Automatic Vent Valve, 1/8 in. Male NPT Connection, Brass Body, Silicone Rubber Seal
Item # 261043

This 1/8 in. automatic air vent valve is used in commercial and residential hydronic heating applications to provide automatic air venting for hot or cold water distribution systems. It consists of a brass body construction with male NPT connection, brass cover, air vent with silicone rubber seal, polyethylene float with valve plug, and automatic vent. It has a high temperature rating and is ideal for use with glycol systems or for use as an anti-vacuum device. It can also be installed to permit the separation and dispersal of air while fluid is circulating in the system. It can be disassembled for inspection and cleaning. The maximum pressure is 150 psi (10 BAR).

  • Body and cover are brass construction
  • Air vent with silicon rubber seal
  • Float is high temperature resistant polyethylene
  • Suitable for use with glycol systems
  • Can be disassembled for inspection and cleaning
  • Provides automatic air venting for hot or cold water distribution systems
  • Purge air that may be in the water system
  • Minimum working pressure is 1.45 psi
  • Maximum working pressure is 150 psi
  • Temperature range is 33 to 240 degree F
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Watts 30 psi Water Pressure Relief Valve
Watts 30 psi Water Pressure Relief Valve
Item # 481004

This 3/4 in. pressure relief valve is used in hot water boiler applications to protect against excessive pressure on all types of hot water heating boiler equipment. It consists of a iron body with forged bronze inlet, non-metallic disc-to-metal seating and stainless steel spring. This valve resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and should not be used as an operating control. The pressure setting is 30 psi for applications up to 550,000 BTU/hr.

  • Iron body with forged bronze inlet
  • 3/4 in. female inlet
  • Set pressure at 30 psi
  • 550,000 BTU/hr rating
  • Resists corrosive water conditions
  • Designed for emergency safety relief and should not be used as an operating control
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Watts Temperature and Pressure Relief Valve, 3/4 in., Lead Free
Watts Temperature and Pressure Relief Valve, 3/4 in., Lead Free
Item # 296204
Eco-friendly item. Symbol indicates that the product is part of our EcoSource green purchasing program. Product meets our sustainability standards for one or more of the following high-performance categories: Water Conservation, Energy Efficiency, Indoor Air Quality, and Material Selection. Lead-Free Product.

This 3/4 in. lead free temperature and pressure relief valve is designed to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU per hour. This two in one relief valve provides a proven and cost effective means to protect against excessive temperature and pressure emergency conditions. It features a lead free copper alloy body with NPT male inlet and NPT female outlet connections, a unique thermostat with special thermo-bonded coating, and test lever. The temperature relief is 210 degree (99 degree C) and the pressure relief is set at 125 psi (8.6 BAR).

  • Lead free copper body construction
  • Unique thermostat with special thermo-bonded coating
  • Protects against excessive temperature and pressure during emergency conditions
  • Temperature relief is 210 degree F (99 degree C)
  • Pressure relief set at 125 psi
  • ASME rated, CSA listed
  • 3/4 in. NPT male inlet and NPT female outlet connections
  • Used to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU/hr
  • ANSI Z21.22 certified
  • Automatic reseating
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Watts 1/2 in. Bronze Combination Fill Valve and Backflow Preventer, Threaded Union End Connections, Teflon Tape
Watts 1/2 in. Bronze Combination Fill Valve and Backflow Preventer, Threaded Union End Connections, Teflon Tape
Item # 316049329

This 1/2 in. bronze combination fill valve and backflow preventer is for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze backflow preventer, model 9D and a bronze feed water pressure regulator, model 1156F, in one pre-assembled unit. The high capacity fill valve provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems and has 1/2 in. union NPT inlet x NPT threaded outlet connections. The maximum pressure is 100 psi (6.9 bar).

  • Horizontal or vertical installation
  • Bronze body for durability
  • Threaded connections
  • Strainer screen
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Watts 1/2 in. Bronze Combination Fill Valve and Backflow Preventer, Union Solder Inlet x Threaded Outlet Connections
Watts 1/2 in. Bronze Combination Fill Valve and Backflow Preventer, Union Solder Inlet x Threaded Outlet Connections
Item # 316080631

This 1/2 in. bronze combination fill valve and backflow preventer is for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze backflow preventer, model 9D and a bronze feed water pressure regulator, model 1156F, in one pre-assembled unit. The high capacity fill valve provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems and has 1/2 in. union solder inlet x NPT threaded outlet connections. The maximum pressure is 100 psi (6.9 bar).

  • Pre-assembled unit
  • Solder connection
  • All bronze, union solder x female NPT
  • High capacity fill
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Watts Bronze Temperature and Pressure Relief Valve 3/4 in. with 1-3/4 in. Shank, Lead Free
Watts Bronze Temperature and Pressure Relief Valve 3/4 in. with 1-3/4 in. Shank, Lead Free
Item # 292894
Eco-friendly item. Symbol indicates that the product is part of our EcoSource green purchasing program. Product meets our sustainability standards for one or more of the following high-performance categories: Water Conservation, Energy Efficiency, Indoor Air Quality, and Material Selection. Lead-Free Product.

This 3/4 in. lead free Bronze temperature and pressure relief valve is designed to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU/hr. This two-in-one relief valve provides a proven and cost effective means to protect against excessive temperature and pressure emergency conditions. It features a lead free copper alloy body with extended shank to accommodated up to 1-3/4 in. of insulation, NPT male inlet and NPT female outlet connections, a unique thermostat with special thermo-bonded coating, and test lever. The temperature relief is 210°F (99°C) and the pressure relief is set at 150 psi (10.3 BAR).

  • Lead free copper alloy body construction
  • Extended shank for thick tank insulation up to 1-3/4 in.
  • 3/4 in. male NPT inlet with pre-applied thread sealant
  • Temperature relief is 210°F (99°C)
  • Pressure relief range is 75 to 150 psi
  • ASME rated, CSA listed
  • Extension thermostat with thermo-bonded coating
  • Used to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU/hr
  • ANSI Z21.22 certified
  • Includes test lever and stainless steel spring
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Watts 1/2 in. Bronze High Capacity Feed Water Pressure Regulator, NPT Threaded Inlet
Watts 1/2 in. Bronze High Capacity Feed Water Pressure Regulator, NPT Threaded Inlet
Item # 316085228

This 1/2 in. high capacity feed water pressure regulator is for use in commercial and residential hydronic heating systems to fill the boiler and piping system with water, and to maintain water pressure in the system at all times. It also provides make-up water to the system in the event of system leaks. It consists of a bronze body with union threaded inlet and NPT threaded outlet connections, a tight seating check valve, stainless steel strainer, and purge lever for manual purging. It has high capacity performance and a simplified servicing design. It is suitable for use in the boiler feed lines of hydronic heating systems. The maximum pressure is 100 psi (6.9 bar).

  • Feed water pressure regulator
  • Tight seating check valve
  • Purge lever
  • High capacity
  • Stainless steel strainer
  • Female threaded inlet connection
  • Female threaded outlet connection
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RectorSeal Magic Vent Air Admittance Valves
RectorSeal Magic Vent Air Admittance Valves
Item # 152045

Magic Vent prevents siphonage without the need for additional piping outdoors. It also performs the function of a DWV system vent stack, protecting the trap seal from siphonage without the need for additional piping to the outdoors. It will save time and money.

  • Eliminates roof penetrations
  • Great design flexibility
  • Saves time and money
  • Permitted for use in accordance with: IPC 2012, Sec 917; IRC 2012
  • Manufactured housing construction and safety standard 2001
  • Air admittance valves
  • Recommended use PVC and ABS
  • Multiple use application
  • 100% pressure tested for quality and performance
  • Superior seal
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Watts 1/8 in. IPS Brass Automatic Vent Valve in Chrome
Watts 1/8 in. IPS Brass Automatic Vent Valve in Chrome
Item # 484014

This automatic vent valve is used in commercial, residential and industrial hydronic heating applications to provide automatic or manual air venting in baseboards, convectors, radiators and high points in piping systems. It consists of a 2-piece chrome plated brass body construction, stainless steel check valve, brass disc bearing cover, copper thermostat assembly, neoprene O-ring, cellulose fiber disc, replaceable cartridge and ABS heat-resistant handwheel. The cartridge can be easily maintained or replaced without system shutdown. This valve is ideal for use with hot water and low pressure steam systems. The maximum pressure is 125 psi (8.6 bar).

  • Chrome brass body
  • Durable stainless steel check valve
  • Quick venting design
  • Positive shut off ball check
  • Heat resistant handwheel
  • Suitable for use with hot water and low pressure steam systems
  • Easily maintained; replacement cartridge can be replaced without system shut down
  • Designed for automatic or manual air release on baseboards and radiators
  • Maximum working pressure is 125 psi
  • Maximum water temperature is 240 degree F
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NIBCO Isolator EXP 3/4 in. IPS Union x SWT Tankless Water Heater Service Valve Kit
NIBCO Isolator EXP 3/4 in. IPS Union x SWT Tankless Water Heater Service Valve Kit
Item # 303136783

The E-X-P E2 is a compact version of the Original E-X-P Tankless Water Heater Service Valve. It features heavy-duty forged brass ball valves with full-port main flow channels. The uniquely designed lever/wing handle is for easy actuation of the main ball. The color-coded aluminum handles are for easy identification of hot and cold valves. This kit includes a residential grade pressure relief valve (150 psi/500,000 BTU/HR).

  • Replaces 14 components, eliminates 12 leak paths, saves 108 minutes of labor
  • Quicker, consistent quality installations
  • Fewer leak paths
  • Allows for easy cleaning or flushing of the system
  • Allows for one-person diagnostic testing
  • Also for use with wall hung and combi boilers
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NIBCO 3/4 in. Brass Cup x Cup Ball Drain Valve
NIBCO 3/4 in. Brass Cup x Cup Ball Drain Valve
Item # 106902

Pro-Pal valves are your best choice for efficient installation and system operation, and for helping to control costs. Pro-Pal valves combine commonly used components into a single forged brass alternatives that will save time and space in any installation. Instead of just building your next piping system, innovate it with Pro-Pal series valves. Designed for use with water, oil, glycol mix in residential or commercial residential plumbing, commercial plumbing, heating systems. Refer to specification sheets for additional technical information. All webstone products are backed by a limited lifetime warranty.

  • Eliminates assemblies needed to isolate and drain any portion of a piped system
  • Press or SWT x FIP options designed specifically for use with pre-fabricated threaded headers
  • Avoids reduced-port alternatives
  • Creates cleaner-looking, more efficient installations applications
  • Reversible handle for added versatility
  • Exclusive adjustable flow path allows for draining from either side of the ball
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LEGEND VALVE 1/2" T-437 Hot Water Radiator Valve, Bronze
CLEARANCE
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Watts Vacuum Relief Valve 1/2 in. Male NPT, Lead Free Brass, Protective Cap
Watts Vacuum Relief Valve 1/2 in. Male NPT, Lead Free Brass, Protective Cap
Item # 295081
Eco-friendly item. Symbol indicates that the product is part of our EcoSource green purchasing program. Product meets our sustainability standards for one or more of the following high-performance categories: Water Conservation, Energy Efficiency, Indoor Air Quality, and Material Selection. Lead-Free Product.

This 1/2 in. lead free vacuum relief valve is suitable for low pressure steam and water service, and is ideal for use in domestic water heaters and supply tanks. This valve automatically allows air to enter into the piping system to prevent vacuum conditions that could siphon water from the system and damage water equipment. It consists of a lead free brass body construction with NPT male inlet connection, and a protective cap. Maximum working pressure is 200 psi.

  • Lead free construction
  • Low profile
  • Maximum temperature 250 degree
  • Maximum steam pressure 15 psi
  • This valve automatically allows air to enter into the piping system to prevent vacuum conditions
  • Ideal for use in domestic water heaters and supply tanks
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NIBCO 1 in. Forged Brass Sweat Air Separator with Removable Vent Head and Coalescing Medium
NIBCO 1 in. Forged Brass Sweat Air Separator with Removable Vent Head and Coalescing Medium
Item # 303113857

The Air Separator is a brass horizontal-mount accessory that traps and forces microbubbles out of the system. It reduces noise and improves system efficiency and operation. It features a removable vent head and stainless steel coalescing medium.

  • 1 in. Inside Diameter and 1.125 in. Outside Diameter
  • Reduces noise, improves system efficiency and operation
  • Reduces wear and tear on system components
  • Allows flow to be directed into either side of the unit
  • Pin guided float for smooth operation
  • Corrosion-resistant stainless steel coalescing medium can be removed and cleaned if a blockage should occur
  • Ideal for use with the Webstone expansion tank ProService valve
  • "1 I.D. and 1.125 O.D."
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Watts Pressure Safety Relief Valve #174A Bronze Body 125 psi
Watts Pressure Safety Relief Valve #174A Bronze Body 125 psi
Item # SX-0964528

This 3/4 in. boiler pressure relief valve is used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief, not as an operating control. The pressure relief is set at 125 psi (862 kPa) with corresponding high pressure ratings up to 2,070,000 BTU/hr.2,070,000 BTU/hr.

  • Spring loaded
  • Non-mechanical seat-to-disc alignment will not stick or freeze
  • Bronze body
  • Automatic reseating
  • To be used in hot water heating and domestic supply boiler applications
  • Designed for emergency safety relief, not as an operating control
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Garrison 1 in. Bronze Steam Radiator Valve
Item # 261008

5 years warranty against defect. For Steam and Hot Water Heating Systems. Innovative push-to-connect design makes for quick and easy installation.

  • 125 psi
  • Solid brass construction
  • Renewable seal
  • Composition disc, wheel
  • Steam-bronze
  • 1 in.
  • IPS x IPS
  • Male x female
  • Black handle
  • Round handle
CLEARANCE
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MAID-O-MIST AUTO-VENT NO.75
MAID-O-MIST AUTO-VENT NO.75
Item # SX-0217166
  • Stainless steel internal bent hot water outlet tube extracts 5-7% more hot water off the top of the tank dome
  • Attractive silver finish cover that resists dents and corrosion
  • High output finned cupronickel heat exchanger provides maximum efficiency 11 fins per inch
  • 316L stainless steel tank for high temperatures and superior corrosion resistance
  • Environmentally safe, CFC free water blown, 2" thick foam insulation allows less than 1/2 defree F heat loss per hour
  • Immersion type stainless steel control well
  • 1" boiler supply connection
  • 1" boiler return connection
  • Silver-finished cover resists dents and corrosion
  • High-output finned cupronickel heat exchanger ensures maximum efficiency
  • 316L stainless steel tank withstands high temperatures
  • Foam insulation ensures less than 1/2 degree F heat loss per hour
CLEARANCE
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LEGEND VALVE 1" T-437 Hot Water Radiator Valve, Bronze
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Watts 1 in. Lead Free Brass Automatic Reseating T and P Relief Valve
Watts 1 in. Lead Free Brass Automatic Reseating T and P Relief Valve
Item # 292813
Eco-friendly item. Symbol indicates that the product is part of our EcoSource green purchasing program. Product meets our sustainability standards for one or more of the following high-performance categories: Water Conservation, Energy Efficiency, Indoor Air Quality, and Material Selection. Lead-Free Product.

This 1 in. lead free automatic reseating temperature and pressure relief valve with a 7 in. thermostat is installed directly in tank tappings and is used in commercial applications to provide automatic temperature and pressure protection for hot water supply tanks and hot water heaters. It features lead free brass construction with NPT male inlet and NPT female outlet connections, thermo-bonded coated thermostat, tamper resistant bonnet screws, automatic reseating feature, and test lever. The temperature relief is 210 degree F (99 degree C) and the pressure relief is 150 psi.

  • Lead free brass body construction
  • Tamper resistant bonnet screws
  • Unique thermostat with a special thermo-bonded coating
  • Non-mechanical seat to disc alignment
CLEARANCE
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NIBCO 3/4 in. Forged Brass FIP Air Separator with Removable Vent Head and Coalescing Medium
NIBCO 3/4 in. Forged Brass FIP Air Separator with Removable Vent Head and Coalescing Medium
Item # 303113854

The Air Separator is a brass horizontal-mount accessory that traps and forces microbubbles out of the system. It reduces noise and improves system efficiency and operation. It features a removable vent head and stainless steel coalescing medium.

  • 3/4 in. Inside Diameter and 0.875 in. Outside Diameter
  • Reduces noise, improves system efficiency and operation
  • Reduces wear and tear on system components
  • Allows flow to be directed into either side of the unit
  • Pin guided float for smooth operation
  • Corrosion-resistant stainless steel coalescing medium can be removed and cleaned if a blockage should occur
  • Ideal for use with the Webstone expansion tank ProService valve
  • "3/4 I.D. and 0.875 O.D."
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NIBCO 3/4 in. Press Forged Brass Air Admittance Valve with Removable Vent Head and Coalescing Medium
NIBCO 3/4 in. Press Forged Brass Air Admittance Valve with Removable Vent Head and Coalescing Medium
Item # 313350871

The Air Separator is a brass horizontal-mount accessory that traps and forces microbubbles out of the system. It reduces noise and improves system efficiency and operation. It features a removable vent head and stainless steel coalescing medium.

  • Reduces noise, improves system efficiency and operation
  • Reduces wear and tear on system components
  • Allows flow to be directed into either side of the unit
  • Pin guided float for smooth operation
  • Corrosion-resistant stainless steel coalescing medium can be removed and cleaned if a blockage should occur
  • Ideal for use with the Webstone expansion tank pro service valve
CLEARANCE
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Watts Automatic Vent Valve, 1/4 IN. MIP
Watts Automatic Vent Valve, 1/4 IN. MIP
Item # 261044

This 1/4 in. automatic air vent valve is used in commercial and residential hydronic heating applications to provide automatic air venting for hot or cold water distribution systems. It consists of a brass body construction with female NPT connection, brass cover, air vent with silicone rubber seal, polyethylene float with valve plug and automatic vent. It has a high temperature rating and is ideal for use with glycol systems or for use as an anti-vacuum device. It can also be installed to permit the separation and dispersal of air while fluid is circulating in the system. It can be disassembled for inspection and cleaning. The maximum pressure is 150 PSI (10 BAR).

  • Brass construction
  • Air vent with silicon rubber seal
  • Float is high temperature resistant polyethylene
  • Suitable for use with glycol systems
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LEGEND VALVE 3/4" T-437 Hot Water Radiator Valve, Bronze
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