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 Plastic Metal 7/11" Dia Thread 0.8MPa Pressure Safety Relief Valve US $6.45 
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 24645 New-No Box, Henry Tech. 5600 Pressure Relief Valve 1/2"NPT 250 PSI US $51.95
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 Black Knob Residual Pressure Relief 3 Port Manual Valve US $18.71
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 Watts 2 740 Pressure Relief Valve, 2x21/2In5, 250,000 btu ZX US $335.50
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 19/32" Dia Thread -5-120C 13MPa Pressure Relief Valve for Air Compressor US $10.06
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 19/32" Dia Thread -5-120C 8MPa Metal Brass Air Pressure Relief Valve US $9.76
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 4/5" Male Thread Pressure Control Brass Safety Relief Valve US $7.50
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 51/64" Dia Thread 1.5MPa Pressure Relief Valve for Air Compressor US $6.49
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 51/64" Dia Thread 0.8MPa Plastic Metal Air Pressure Relief Valve US $6.88
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 Boiler Pressure Relief Valve 740 Set 30 lbs 1 1/4 in. x 1 1/2 in. Watts US $150.00
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 1" 25.4mm Male Thread Air Compressor Brass Pressure Relief Valve US $14.44
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 American Granby IRV-50-100 Pressure Relief Valves 10 pcs US $49.95
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 WATTS 174A Pressure Relief Valve 3/4" ZA-230 US $39.99
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 New Parker Pilot Operated Pressure Relief Valve, Series RS Part# RS25R35S4SN1JW US $675.00
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 Cash Acme Type FWL-2 3/4" Safety Pressure Relief Valve US $34.99
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 Lubriquip 2000PSI A99 Pressure Relief Valve 1/8"NPT NEW US $9.99
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 Lubriquip H98 1500 psi Pressure Relief Valve 1/8" NPT US $9.99
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 Lubriquip G97 750psi Pressure Relief Valve 1/8" NPT NEW US $9.99
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 Lubriquip B97 600psi Pressure Relief Valve 1/8" NPT NEW US $9.99
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 Double A NNNBC-3-10M-10D2 Pressure relief US $85.00
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 Air Compressor Threaded Safety Pressure Relief Valve US $8.35
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 1/8" Thread Pressure Relief Valve for Air Compressor US $4.27
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 STAINLESS PRESSURE RELIEF VALVE 1 1/2" TRI-CLAMP -T316 US $797.70
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 Denison Pressure Relief Valve #35-11857-Y - 'Potato Masher Style' US $60.00
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 Replacement 1/2" Thread Safety Pressure Relief Valve for Air Compressor US $6.83
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 VICKERS RCG 10 D2 30 PRESSURE RELIEF CONTROL VALVE US $585.69
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 Kunkle Valve Pressure relief 1 1/2 135 PSI 83-4 1793cfm US $159.99
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 Teledyne Farris Pressure Relief Valve 1 1/2 x 2 US $150.00
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 Henry 400lbs pressure relief valve 5232 (1/2" x 5/8") US $20.00
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 Male Threaded Pressure Relief Valve for Air Compressor US $4.39
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 New 1/2" Henry Pressure Relief Safety Valve 527E 350 psi nsn 4820-01-257-8680 US $24.50
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 MERCRUISER RACE BOAT WATER PRESSURE RELIEF VALVE MARINE US $50.00
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 Air Compressor 0.79" Male Thread Pressure Relief Valve US $7.86
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 7/11" Dia Thread 1.3MPa Pressure Relief Valve for Air Compressor US $5.79
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 0.6" Male Thread Air Compressor Pressure Relief Valve US $7.34
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 Air Compressor Spare Part 3/4" PT Thread Dia Pressure Relief Valve US $14.39
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 25.4mm 1" Male Thread Pressure Relief Valve for Air Compressor US $12.46
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 TELEDYNE FLUID SYSTEMS PRESSURE RELIEF VALVE 1896ML3M40 US $69.99
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 Air Compressor Spare Part 1/2" Thread Safety Pressure Relief Valve US $6.27
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 0.63" Male Thread Pressure Control Brass Safety Relief Valve US $7.01
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 10 Caltherm Copper/Brass Pressure Relief Valves, Flare Fitting CT14-150-01, PSI US $7.99
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 nos KUNKLE brass relief safety valve.blow down.2" FIG 231.steam pressure US $150.00
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 nos KUNKLE brass relief safety valve.blow down.1 1/2" FIG 2.steam pressure US $125.00
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 SMC VHS40-N03-Z Residual Pressure Relief 3 Port Valve US $32.99
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 WATTS 174A PRESSURE RELIEF VALVE 3/4" SET 90 LBS NEW US $32.00
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 BOSCH 0811-104-113 PRESSURE RELIEF VALVE, 315 BAR MAX US $7.16
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 4/5" Dia Thread -5-120C 15MPa Metal Pressure Relief Valve for Air Compressor US $12.48
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 CROSBY PRESSURE RELIEF VALVE US $549.95
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 WATTS REGULATOR PRESSURE RELIEF VALVE SET TO 175PSI 1/2" FP 53L 175 NEW US $14.99
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 0.8" Thread Pressure Relief Valve for Air Compressor US $7.63
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 1/2" Male Thread Red Hat Pressure Relief Valve w Ring US $4.35
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 Watts Regulator ASME Water Pressure Relief Valve SKU#0274428 w/Box: New US $7.25
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 APOLLO PRESSURE RELIEF VALVE 17-401-04 US $26.25
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 3/4" WATER WELL PUMP PRESSURE RELIEF VALVE US $10.50
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 1/2" WATER WELL PUMP PRESSURE RELIEF VALVE US $10.00
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 KUNKLE 1/2" SS PRESSURE RELIEF VALVE UU2751 NEW US $175.00
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 1 1/2" x 2" Watts Pressure Safety Relief Valve 740 030 US $110.00
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 Canbraco Temperature and pressure relief valve 18-400 seriex 150 psi US $6.95
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 TELEDYNE FARRIS PRESSURE RELIEF VALVE 1856M-PKD US $74.99
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 Griffco Pressure Relief Valve PRT050P 10-150 PSI US $85.00
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 Kunkle Pressure Relief Valve 6010EDM01 *NEW* US $85.00
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 Rexroth Proportion Pressure Relief Valve ACA-0581-0-C-1 US $595.00
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 WATTS (740-075) 1" X 1-1/4" PRESSURE RELIEF VALVE NEW US $164.99
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 Watts 10L Pressure Relief Valve 3/4" US $10.00
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 ROSS 2768B3901 PNEUMATIC PRESSURE RELIEF VALVE, 3/8" NPT PORTS, NIB US $77.50
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 Air Compressor 0.65" Male Thread Pressure Relief Valve US $7.61
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 Vickers Hydraulic Pressure Control Relief Valve RT 06 US $149.00
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 Pressure Equalizing Relief Valve Air Travel Chest Stainless Steel Military Grade US $3.65
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 Vickers DGMC2-3-AB-CW-BA-CW-41 Pressure Relief Valve US $395.00
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 VICKERS CS5-060AFMFWB5100 SOLENOID CONTROLLED PRESSURE RELIEF DIRECTIONAL VALVE US $799.15
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 2.5" Kunkle Model 300 300LLJ01 Pressure Relief Valve 180 PSI US $1,200.00
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 Watts Water Pressure Safety Relief Valve 3/4" 0391634 US $44.99
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 SUPERIOR PRESSURE RELIEF VALVE 3212-400 ~ New US $36.96
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 Fluid Mechanics Pressure Relief Valve US $48.00
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 STEAM BOILER SAFETY PRESSURE RELIEF VALVE 3/4" ASME US $229.00
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 STEAM BOILER SAFETY PRESSURE RELIEF VALVE 1" ASME US $279.00
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 STEAM BOILER SAFETY PRESSURE RELIEF VALVE 1 1/4" ASME US $349.00
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 STEAM BOILER SAFETY PRESSURE RELIEF VALVE 1 1/2" ASME US $399.00
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 cummins common pressure relief valve US $50.00
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 OSECO 301087-001 A7-3761-01 SANITARY PRESSURE RELIEF US $79.00
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 Pressure Relief Valves, Brass, Lot of 5 US $7.49
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 CONBRACO Pressure Relief Valve 125 PSI MODEL 29-302-30 US $39.95
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 NOS McDonnell & Miller No. 250-3/4 inch Pressure Relief Valve US $19.99
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 TELEDYNE FARRIS PRESSURE RELIEF VALVE TYPE 26JC10-170 US $300.00
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 0.63" Male Thread Brass Pressure Safety Relief Valve US $6.93
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 WATTS 740 Pressure Relief Valve 1"X1-1/4" 30PSI 0382570 US $110.99
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 WATTS 174A Pressure Relief Valve 1-1/2" 30 PSI 0276500 US $289.99
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 MUELLER AG15503 PRESSURE RELIEF VALVE 24834 US $29.00
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Pressure Relief
Pressure Relief Valve
A Pressure Relief Valve (PRV) is a safety device that is designed to divert pressure in the event that a pressurized system of some kind encounters a problem, which leads to a dangerous rise in pressure. One classic example of a pressure relief valve is the valve mounted on a hot water heater that "bleeds" if the temperature or water pressure inside becomes too high, preventing a catastrophic failure of the water heater. Pressure relief valves are extremely useful, and required by law for safety reasons in many regions.
The idea behind a pressure relief valve is that it provides an outlet for dangerous build-ups of pressure. Pressurized gases and liquids can both be regulated with the assistance of a pressure relief valve. In the event that pressure in the system becomes too high, instead of blowing out the entire system, the pressurized liquid or gas will vent from the pressure relief valve, bringing the pressure back down and preventing a serious incident.
Pressurized systems are used to move various liquids and gases around, with the force of the pressure pushing the substance through a series of pipes. In a home, for example, the pressure in the system is what allows water to flow when a tap is opened; if pressure is lost, nothing will come out of the tap. However, if the pressure is high enough, it could potentially cause an explosion, unless a safety valve is in place. High pressure can also damage devices connected to the system, or it may cause unexpected outcomes, such as a burst of flame from a gas stove when it is lit, or unusually high water pressure from a tap that could surprise a user.
Pressure relief valves can be set to open at a specific pressure or temperature. They are often situated in the open air, to prevent damage from leaks and spills. Many systems have a failsafe in place, so that when the pressure relief valve opens, the system also turns off or otherwise alerts the user to a problem.
In the case of a hot water heater, the valve is actually a temperature pressure relief valve (TPRV or TPR valve). These valves are calibrated to open and release water when either the temperature or the pressure gets too high, and they can be tested by lifting the small lever on the front of the valve to see if water flows out. Regular testing is strongly recommended, as an exploding hot water heater can do a significant amount of damage, easily blowing through beams and supporting walls.
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