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Temperature & Pressure Relief Valves

  • 3/4" NCLX-5L Domestic T&P Relief Valve Product Image
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    3/4" NCLX-5L Domestic T&P Relief Valve 18821-0150 3/4" NCLX-5L Domestic T&P Relief Valve
    SKU: 18821-0150
    Brand: Cash-Acme
    (1)
    $11.95 each
    24
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    24 Thu, Dec 26
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  • LF100XL-4 3/4" Lead Free<Br>Self Closing T & P Relief<br>Valve Product Image
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    LF100XL-4 3/4" Lead Free Self Closing T & P Relief Valve 0556000 LF100XL-4 3/4" Lead Free Self Closing T & P Relief Valve
    SKU: 0556000
    Brand: Watts
    (6)
    $15.49 each
      Box Up & Save 5%  
    $147.90 box of 10
    $14.79 each
    144
    Thu, Dec 26
    187
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    144 Thu, Dec 26
    43 Fri, Dec 27
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  • LF100XL-8,  3/4" Lead Free T & P Relief Valve Product Image
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    LF100XL-8, 3/4" Lead Free T & P Relief Valve 0556001 LF100XL-8, 3/4" Lead Free T & P Relief Valve
    SKU: 0556001
    Brand: Watts
    (3)
    $20.99 each
      Box Up & Save 4%  
    $200.90 box of 10
    $20.09 each
    60
    Thu, Dec 26
    72
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    60 Thu, Dec 26
    12 Fri, Dec 27
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  • 3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi) Product Image
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    3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi) 0556016 3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi)
    SKU: 0556016
    Brand: Watts
    (6)
    $102.99 each
    29
    Thu, Dec 26
    29
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    29 Thu, Dec 26
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  • 1" 40XL-4 Lead Free T&P Relief Valve (150 psi) Product Image
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    1" 40XL-4 Lead Free T&P Relief Valve (150 psi) 0556008 1" 40XL-4 Lead Free T&P Relief Valve (150 psi)
    SKU: 0556008
    Brand: Watts
    (2)
    $159.99 each
    19
    Thu, Dec 26
    19
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    19 Thu, Dec 26
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  • LFLL100XL, 3/4" Lead<br>Free Extended Shank<br>T & P Relief Valve Product Image
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    LFLL100XL, 3/4" Lead Free Extended Shank T & P Relief Valve 0556002 LFLL100XL, 3/4" Lead Free Extended Shank T & P Relief Valve
    SKU: 0556002
    Brand: Watts
    (1)
    $25.99 each
      Box Up & Save 4%  
    $248.90 box of 10
    $24.89 each
    61
    Thu, Dec 26
    61
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    61 Thu, Dec 26
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  • 3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free Product Image
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    3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free 23261-0150 3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free
    SKU: 23261-0150
    Brand: Cash-Acme
    (1)
    $16.15 each
      Box Up & Save 4%  
    $93.30 box of 6
    $15.55 each
    46
    Thu, Dec 26
    46
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    46 Thu, Dec 26
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  • 1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi) Product Image
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    1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi) 0121325 1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi)
    SKU: 0121325
    Brand: Watts
    (11)
    $32.99 each
      Box Up & Save 4%  
    $315.90 box of 10
    $31.59 each
    22
    Thu, Dec 26
    22
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    22 Thu, Dec 26
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  • 3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free <br>(1" Element) Product Image
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    3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free (1" Element) 23279-0150 3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free (1" Element)
    SKU: 23279-0150
    Brand: Cash-Acme
    (1)
    $22.75 each
    17
    Thu, Dec 26
    17
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    17 Thu, Dec 26
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  • 3/4" 40XL-5 T&P Relief Valve (150 psi) Product Image
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    3/4" 40XL-5 T&P Relief Valve (150 psi) 0156731 3/4" 40XL-5 T&P Relief Valve (150 psi)
    Contains Lead
    SKU: 0156731
    Brand: Watts
    (6)
    $95.99 each
    19
    Thu, Dec 26
    25
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    19 Thu, Dec 26
    6 Fri, Dec 27
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  • 3/4" FVMX-5C Commercial T&P Relief Valve<br>(Male Inlet) Product Image
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    3/4" FVMX-5C Commercial T&P Relief Valve (Male Inlet) 16934-0150 3/4" FVMX-5C Commercial T&P Relief Valve (Male Inlet)
    Contains Lead
    SKU: 16934-0150
    Brand: Cash-Acme
    $53.95 each
    31
    Thu, Dec 26
    31
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    31 Thu, Dec 26
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  • LFL100XL3M7, 3/4" Lead<br>Free Extended Shank<br>T & P Relief Valve Product Image
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    LFL100XL3M7, 3/4" Lead Free Extended Shank T & P Relief Valve 0556003 LFL100XL3M7, 3/4" Lead Free Extended Shank T & P Relief Valve
    SKU: 0556003
    Brand: Watts
    (1)
    $26.99 each
      Box Up & Save 4%  
    $258.90 box of 10
    $25.89 each
    22
    Thu, Dec 26
    22
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    22 Thu, Dec 26
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  • 3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet) Product Image
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    3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet) 19497-0050 3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet)
    Contains Lead
    SKU: 19497-0050
    Brand: Cash-Acme
    (1)
    $45.95 each
    12
    Thu, Dec 26
    12
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    12 Thu, Dec 26
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  • LF100XL 3/4" Lead Free<br>T & P Relief Valve<br>(175 PSI, 210 F) Product Image
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    LF100XL 3/4" Lead Free T & P Relief Valve (175 PSI, 210 F) 0121344 LF100XL 3/4" Lead Free T & P Relief Valve (175 PSI, 210 F)
    SKU: 0121344
    Brand: Watts
    (1)
    $18.49 each
      Box Up & Save 4%  
    $176.90 box of 10
    $17.69 each
    17
    Thu, Dec 26
    17
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    17 Thu, Dec 26
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  • 1" LF40XL-7 Lead Free T&P Relief Valve (150 psi) Product Image
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    1" LF40XL-7 Lead Free T&P Relief Valve (150 psi) 0121428 1" LF40XL-7 Lead Free T&P Relief Valve (150 psi)
    SKU: 0121428
    Brand: Watts
    $209.99 each
      Box Up & Save 1%  
    $415.18 box of 2
    $207.59 each
    32
    Thu, Dec 26
    32
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    32 Thu, Dec 26
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  • 3/4" NCLX-LS Domestic T&P Relief Valve Product Image
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    3/4" NCLX-LS Domestic T&P Relief Valve 19084-0150 3/4" NCLX-LS Domestic T&P Relief Valve
    SKU: 19084-0150
    Brand: Cash-Acme
    $18.95 each
    33
    Thu, Dec 26
    33
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    33 Thu, Dec 26
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  • 3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet) Product Image
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    3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet) 16931-0150 3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet)
    Contains Lead
    SKU: 16931-0150
    Brand: Cash-Acme
    $105.95 each
    2
    Thu, Dec 26
    2
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    2 Thu, Dec 26
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  • 3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet) Product Image
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    3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet) 19783-0150 3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet)
    Contains Lead
    SKU: 19783-0150
    Brand: Cash-Acme
    (1)
    $16.95 each
    5
    Thu, Dec 26
    5
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    5 Thu, Dec 26
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  • 3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi) Product Image
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    3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi) 0121421 3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi)
    SKU: 0121421
    Brand: Watts
    $229.99 each
      Box Up & Save 4%  
    $662.07 box of 3
    $220.69 each
    5
    Thu, Dec 26
    5
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    5 Thu, Dec 26
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  • 1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet) Product Image
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    1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet) 22894-0150 1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet)
    Contains Lead
    SKU: 22894-0150
    Brand: Cash-Acme
    (1)
    $149.95 each
    1
    Thu, Dec 26
    1
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    1 Thu, Dec 26
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  • 3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet) Product Image
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    3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet) 23275-0150 3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet)
    SKU: 23275-0150
    Brand: Cash-Acme
    $145.95 each
    5
    Thu, Dec 26
    5
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    5 Thu, Dec 26
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  • 100XL8-100210 3/4" Temperature & Pressure Relief Valve Product Image
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    100XL8-100210 3/4" Temperature & Pressure Relief Valve 0066123 100XL8-100210 3/4" Temperature & Pressure Relief Valve
    SKU: 0066123
    Brand: Watts
    $42.99 each
    5
    Thu, Dec 26
    5
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    5 Thu, Dec 26
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  • 3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet) Product Image
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    3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet) 23255-0150 3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet)
    SKU: 23255-0150
    Brand: Cash-Acme
    $59.99 each
    6
    Thu, Dec 26
    6
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    6 Thu, Dec 26
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  • 3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet) Product Image
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    3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet) 23256-0150 3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet)
    SKU: 23256-0150
    Brand: Cash-Acme
    (1)
    $133.95 each
    3
    Thu, Dec 26
    3
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    3 Thu, Dec 26
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Resources

Articles

  • A Temperature and Pressure (T & P) relief valve is the primary "back-up" safety device that prevents water in a pressurized hot water heater from overheating. A T & P relief valve is a two-in-one safety device, which responds both to excessive temperature and to excessive pressure in a water heater. If a system exceeds its temperature/pressure limit, a water heater or pipe will burst, making the proper installation of a T&P relief valve essential.

    How does it work?

    A T & P valve responds to excessive temperature by expansion of the thermostat. This lifts the disc off its seat and discharges overheated water. As overheated water exits the tank it is replaced by cool water. This process regulates the water temperature in a hot water heater. Typically, when a valve is relieving water in volume, it is due to excessive temperature.

    The valve also responds to excessive pressure by discharging water to prevent further pressure increase. When water is heated in a closed system, it expands and causes an increase in pressure. This is called thermal expansion. When the system is opened, pressure will return to normal, and the relief valve will stop dripping. When a backflow prevention device or check valve is installed on the water service entering a building, a closed system is created. When water is heated, it expands. Because the water has nowhere to go in a closed system, a potentially dangerous situation is created, and a T&P relief valve must be installed. If a T & P valve is dripping, rather than relieving in volume, the valve is prevented from closing tightly. A dripping valve usually indicates either thermal expansion or debris on the seat.

    T & P relief valves may be constructed of bronze or cast iron. To select the proper T & P relief valve a system's capacity, pressure, and temperature requirements must be determined. We offer a wide selection of Bell & Gossett, Watts, Zurn - Wilkins, McDonnell & Miller, and Cash - Acme relief valves to protect your heating system.

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