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Temperature & Pressure Relief Valves

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
    (4)
    $11.95 each
    300
    Wed, Aug 19
    300
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    300 Wed, Aug 19
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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)
    $15.86 each
    178
    Wed, Aug 19
    199
    QtyArrives
    178 Wed, Aug 19
    21 Thu, Aug 20
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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
    (4)
    $19.99 each
    52
    Wed, Aug 19
    52
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    52 Wed, Aug 19
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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)
    $140.39 each
    49
    Wed, Aug 19
    56
    QtyArrives
    49 Wed, Aug 19
    7 Thu, Aug 20
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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)
    $229.60 each
    33
    Wed, Aug 19
    33
    QtyArrives
    33 Wed, Aug 19
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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)
    $24.99 each
    113
    Wed, Aug 19
    113
    QtyArrives
    113 Wed, Aug 19
    Questions? Call 1-888-757-4774
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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
    (2)
    $16.15 each
    44
    Wed, Aug 19
    44
    QtyArrives
    44 Wed, Aug 19
    Questions? Call 1-888-757-4774
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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)
    $89.69 each
    101
    Wed, Aug 19
    105
    QtyArrives
    101 Wed, Aug 19
    4 Thu, Aug 20
    Questions? Call 1-888-757-4774
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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
    30
    Wed, Aug 19
    30
    QtyArrives
    30 Wed, Aug 19
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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)
    $24.99 each
    32
    Wed, Aug 19
    33
    QtyArrives
    32 Wed, Aug 19
    1 Thu, Aug 20
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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
    28
    Wed, Aug 19
    28
    QtyArrives
    28 Wed, Aug 19
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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)
    $31.39 each
    53
    Wed, Aug 19
    53
    QtyArrives
    53 Wed, Aug 19
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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
    21
    Wed, Aug 19
    21
    QtyArrives
    21 Wed, Aug 19
    Questions? Call 1-888-757-4774
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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)
    $20.11 each
    32
    Wed, Aug 19
    32
    QtyArrives
    32 Wed, Aug 19
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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
    37
    Wed, Aug 19
    37
    QtyArrives
    37 Wed, Aug 19
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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
    4
    Wed, Aug 19
    4
    QtyArrives
    4 Wed, Aug 19
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  • 3/4" NCLX-8 T&P Relief Valve Product Image
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    3/4" NCLX-8 T&P Relief Valve 16372-0150 3/4" NCLX-8 T&P Relief Valve
    SKU: 16372-0150
    Brand: Cash-Acme
    $17.99 each
    13
    Wed, Aug 19
    13
    QtyArrives
    13 Wed, Aug 19
    Questions? Call 1-888-757-4774
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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
    $199.99 each
    8
    Wed, Aug 19
    8
    QtyArrives
    8 Wed, Aug 19
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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
    16
    Wed, Aug 19
    16
    QtyArrives
    16 Wed, Aug 19
    Questions? Call 1-888-757-4774
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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
    (2)
    $16.95 each
    16
    Wed, Aug 19
    16
    QtyArrives
    16 Wed, Aug 19
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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
    14
    Wed, Aug 19
    14
    QtyArrives
    14 Wed, Aug 19
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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
    $217.99 each
    10
    Wed, Aug 19
    10
    QtyArrives
    10 Wed, Aug 19
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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
    12
    Wed, Aug 19
    12
    QtyArrives
    12 Wed, Aug 19
    Questions? Call 1-888-757-4774
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  • 1" FVMX-5C Commercial T&P Relief Valve Product Image
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    1" FVMX-5C Commercial T&P Relief Valve 16939-0150 1" FVMX-5C Commercial T&P Relief Valve
    Contains Lead
    SKU: 16939-0150
    Brand: Cash-Acme
    (2)
    $77.95 each
    7
    Wed, Aug 19
    7
    QtyArrives
    7 Wed, Aug 19
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FAQs, Manuals & Videos
View Resources

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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