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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 Cash-Acme
    SKU: 18821-0150
    Brand: Cash-Acme
    (7)
    $11.68 each
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    61
    Mon, Nov 1
    122
    QtyArrives
    61 Mon, Nov 1
    61 Tue, Nov 2
    Questions? Call 1-888-757-4774
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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 Watts
    SKU: 0556000
    Brand: Watts
    (7)
    $20.30 each
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    Mon, Nov 8 – Mon, Nov 15
    Arrives
    Mon, Nov 8 – Mon, Nov 15
    Questions? Call 1-888-757-4774 or
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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 Watts
    SKU: 0556001
    Brand: Watts
    (4)
    $27.23 each
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    15
    Mon, Nov 1
    104
    QtyArrives
    15 Mon, Nov 1
    89 Tue, Nov 2
    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 Cash-Acme
    SKU: 23261-0150
    Brand: Cash-Acme
    (3)
    $18.74 each
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    7
    Mon, Nov 1
    139
    QtyArrives
    7 Mon, Nov 1
    132 Tue, Nov 2
    Questions? Call 1-888-757-4774
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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 Watts
    SKU: 0556002
    Brand: Watts
    (1)
    $28.61 each
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    41
    Tue, Nov 2
    41
    QtyArrives
    41 Tue, Nov 2
    Questions? Call 1-888-757-4774
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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 Watts
    SKU: 0556016
    Brand: Watts
    (6)
    $179.69 each
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    2
    Mon, Nov 1
    4
    QtyArrives
    2 Mon, Nov 1
    2 Tue, Nov 2
    Questions? Call 1-888-757-4774
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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 Watts
    SKU: 0556008
    Brand: Watts
    (2)
    $293.87 each
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    Mon, Nov 15 – Mon, Nov 22
    Arrives
    Mon, Nov 15 – Mon, Nov 22
    Questions? Call 1-888-757-4774 or
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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 Watts
    SKU: 0156731
    Brand: Watts
    (6)
    $99.99 each
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    15
    Mon, Nov 1
    49
    QtyArrives
    15 Mon, Nov 1
    34 Tue, Nov 2
    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 Watts
    SKU: 0556003
    Brand: Watts
    (2)
    $28.00 each
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    1
    Mon, Nov 1
    15
    QtyArrives
    1 Mon, Nov 1
    14 Tue, Nov 2
    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 Cash-Acme
    SKU: 19783-0150
    Brand: Cash-Acme
    (1)
    $16.97 each
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    16
    Mon, Nov 1
    78
    QtyArrives
    16 Mon, Nov 1
    62 Tue, Nov 2
    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 Watts
    SKU: 0121325
    Brand: Watts
    (12)
    $36.66 each
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    22
    Tue, Nov 2
    22
    QtyArrives
    22 Tue, Nov 2
    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 Cash-Acme
    SKU: 19084-0150
    Brand: Cash-Acme
    (1)
    $20.77 each
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    5
    Mon, Nov 1
    54
    QtyArrives
    5 Mon, Nov 1
    49 Tue, Nov 2
    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 Cash-Acme
    SKU: 22894-0150
    Brand: Cash-Acme
    (2)
    $173.67 each
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    6
    Mon, Nov 1
    46
    QtyArrives
    6 Mon, Nov 1
    40 Tue, Nov 2
    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 Cash-Acme
    SKU: 23279-0150
    Brand: Cash-Acme
    (1)
    $25.38 each
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    6
    Tue, Nov 2
    6
    QtyArrives
    6 Tue, Nov 2
    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 Cash-Acme
    SKU: 23263-0150
    Brand: Cash-Acme
    $44.04 each
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    8
    Mon, Nov 1
    31
    QtyArrives
    8 Mon, Nov 1
    23 Tue, Nov 2
    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 Cash-Acme
    SKU: 16372-0150
    Brand: Cash-Acme
    (1)
    $20.93 each
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    8
    Mon, Nov 1
    21
    QtyArrives
    8 Mon, Nov 1
    13 Tue, Nov 2
    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 Cash-Acme
    SKU: 19497-0050
    Brand: Cash-Acme
    (1)
    $50.50 each
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    4
    Mon, Nov 1
    29
    QtyArrives
    4 Mon, Nov 1
    25 Tue, Nov 2
    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 Cash-Acme
    SKU: 23255-0150
    Brand: Cash-Acme
    $69.72 each
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    19
    Mon, Nov 1
    28
    QtyArrives
    19 Mon, Nov 1
    9 Tue, Nov 2
    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 Watts
    SKU: 0121344
    Brand: Watts
    (1)
    $25.75 each
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    2
    Mon, Nov 1
    29
    QtyArrives
    2 Mon, Nov 1
    27 Tue, Nov 2
    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 Cash-Acme
    SKU: 16934-0150
    Brand: Cash-Acme
    $80.42 each
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    11
    Mon, Nov 1
    43
    QtyArrives
    11 Mon, Nov 1
    32 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • 3/4" NCLX-A Domestic T&P Relief Valve Product Image
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    3/4" NCLX-A Domestic T&P Relief Valve 22348-0150 3/4" NCLX-A Domestic T&P Relief Valve
    SKU: 22348-0150 Cash-Acme
    SKU: 22348-0150
    Brand: Cash-Acme
    $18.91 each
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    Mon, Nov 15 – Mon, Nov 22
    Arrives
    Mon, Nov 15 – Mon, Nov 22
    Questions? Call 1-888-757-4774 or
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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 Watts
    SKU: 0121428
    Brand: Watts
    $222.99 each
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    13
    Mon, Nov 1
    18
    QtyArrives
    13 Mon, Nov 1
    5 Tue, Nov 2
    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 Watts
    SKU: 0066090
    Brand: Watts
    $19.14 each
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    55
    Tue, Nov 2
    55
    QtyArrives
    55 Tue, Nov 2
    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 Cash-Acme
    SKU: 15638-0150
    Brand: Cash-Acme
    $172.94 each
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    1
    Mon, Nov 1
    12
    QtyArrives
    1 Mon, Nov 1
    11 Tue, Nov 2
    Questions? Call 1-888-757-4774
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FAQs, Manuals & Videos
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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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