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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
    (7)
    $10.94 each
    703
    Fri, May 21
    703
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    703 Fri, May 21
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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
    (7)
    $16.65 each
    Thu, May 27 – Fri, Jun 4
    Arrives
    Thu, May 27 – Fri, Jun 4
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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)
    $22.34 each
    Thu, May 27 – Fri, Jun 4
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    Thu, May 27 – Fri, Jun 4
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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
    (3)
    $16.15 each
    164
    Fri, May 21
    164
    QtyArrives
    164 Fri, May 21
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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)
    $23.91 each
    Thu, May 27 – Fri, Jun 4
    Arrives
    Thu, May 27 – Fri, Jun 4
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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)
    $147.41 each
    Fri, Jun 4 – Fri, Jun 11
    Arrives
    Fri, Jun 4 – Fri, Jun 11
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  • 1" LF40XL-4 Lead Free T&P Relief Valve (150 psi) Product Image
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    1" LF40XL-4 Lead Free T&P Relief Valve (150 psi) 0556008 1" LF40XL-4 Lead Free T&P Relief Valve (150 psi)
    SKU: 0556008
    Brand: Watts
    (2)
    $241.08 each
    Fri, Jun 4 – Fri, Jun 11
    Arrives
    Fri, Jun 4 – Fri, Jun 11
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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)
    $94.18 each
    44
    Fri, May 21
    44
    QtyArrives
    44 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    (2)
    $25.22 each
    29
    Fri, May 21
    29
    QtyArrives
    29 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    (12)
    $30.64 each
    13
    Fri, May 21
    13
    QtyArrives
    13 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    (2)
    $149.96 each
    32
    Fri, May 21
    32
    QtyArrives
    32 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    (1)
    $21.42 each
    Fri, Jun 4 – Fri, Jun 11
    Arrives
    Fri, Jun 4 – Fri, Jun 11
    Questions? Call 1-888-757-4774 or LiveChat Img Chat Us
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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)
    $24.83 each
    Fri, Jun 4 – Fri, Jun 11
    Arrives
    Fri, Jun 4 – Fri, Jun 11
    Questions? Call 1-888-757-4774 or LiveChat Img Chat Us
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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
    $16.06 each
    88
    Fri, May 21
    88
    QtyArrives
    88 Fri, May 21
    Questions? Call 1-888-757-4774
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  • 3/4" NCLX-5S Domestic T&P Relief Valve, Extended Length Body (Lead Free) Product Image
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    3/4" NCLX-5S Domestic T&P Relief Valve, Extended Length Body (Lead Free) 23263-0150 3/4" NCLX-5S Domestic T&P Relief Valve, Extended Length Body (Lead Free)
    SKU: 23263-0150
    Brand: Cash-Acme
    $37.93 each
    34
    Fri, May 21
    34
    QtyArrives
    34 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    $58.04 each
    25
    Fri, May 21
    25
    QtyArrives
    25 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    $18.00 each
    35
    Fri, May 21
    35
    QtyArrives
    35 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    50
    Fri, May 21
    50
    QtyArrives
    50 Fri, May 21
    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)
    $21.12 each
    10
    Fri, May 21
    10
    QtyArrives
    10 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    Fri, May 21
    21
    QtyArrives
    21 Fri, May 21
    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
    $210.00 each
    29
    Fri, May 21
    29
    QtyArrives
    29 Fri, May 21
    Questions? Call 1-888-757-4774
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  • 1" FVX-5L Commercial T&P Relief Valve (Female Inlet) Product Image
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    1" FVX-5L Commercial T&P Relief Valve (Female Inlet) 15638-0150 1" FVX-5L Commercial T&P Relief Valve (Female Inlet)
    SKU: 15638-0150
    Brand: Cash-Acme
    $149.32 each
    15
    Fri, May 21
    15
    QtyArrives
    15 Fri, May 21
    Questions? Call 1-888-757-4774
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  • 100XL-125210 3/4" Self Closing T & P Relief Valve w/ Test Lever (125 PSI, 210 F) Product Image
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    100XL-125210 3/4" Self Closing T & P Relief Valve w/ Test Lever (125 PSI, 210 F) 0066090 100XL-125210 3/4" Self Closing T & P Relief Valve w/ Test Lever (125 PSI, 210 F)
    SKU: 0066090
    Brand: Watts
    $17.42 each
    24
    Fri, May 21
    24
    QtyArrives
    24 Fri, May 21
    Questions? Call 1-888-757-4774
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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
    $45.15 each
    Thu, May 27 – Fri, Jun 4
    Arrives
    Thu, May 27 – Fri, Jun 4
    Questions? Call 1-888-757-4774 or LiveChat Img Chat Us
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FAQs, Manuals & Videos

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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