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Temperature & Pressure Relief Valves

  • LF100XL-4 3/4" Lead Free<Br>Self Closing T & P Relief<br>Valve Product Image
    $15.49 each
    $147.90 box of 10
    $14.79 each
    360
    Tue, Sep 3
    360
    QtyArrives
    360 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" NCLX-5L Domestic T&P Relief Valve Product Image
    3/4" NCLX-5L Domestic T&P Relief Valve
    SKU: 18821-0150
    Brand: Cash-Acme
    (1)
    $11.95 each
    58
    Tue, Sep 3
    58
    QtyArrives
    58 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • LF100XL-8,  3/4" Lead Free T & P Relief Valve Product Image
    $20.99 each
    $200.90 box of 10
    $20.09 each
    129
    Tue, Sep 3
    129
    QtyArrives
    129 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi) Product Image
    $102.99 each
    78
    Tue, Sep 3
    78
    QtyArrives
    78 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free Product Image
    3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free
    SKU: 23261-0150
    Brand: Cash-Acme
    (1)
    $16.15 each
    $93.30 box of 6
    $15.55 each
    15
    Tue, Sep 3
    15
    QtyArrives
    15 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • LFLL100XL, 3/4" Lead<br>Free Extended Shank<br>T & P Relief Valve Product Image
    $25.99 each
    $248.90 box of 10
    $24.89 each
    104
    Tue, Sep 3
    104
    QtyArrives
    104 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 1" 40XL-4 Lead Free T&P Relief Valve (150 psi) Product Image
    $159.99 each
    69
    Tue, Sep 3
    69
    QtyArrives
    69 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi) Product Image
    $32.99 each
    $315.90 box of 10
    $31.59 each
    39
    Tue, Sep 3
    39
    QtyArrives
    39 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free <br>(1" Element) Product Image
    $22.75 each
    9
    Tue, Sep 3
    9
    QtyArrives
    9 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" 40XL-5 T&P Relief Valve (150 psi) Product Image
    3/4" 40XL-5 T&P Relief Valve (150 psi)
    Contains Lead
    SKU: 0156731
    Brand: Watts
    (6)
    $95.99 each
    45
    Tue, Sep 3
    45
    QtyArrives
    45 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" FVMX-5C Commercial T&P Relief Valve<br>(Male Inlet) Product Image
    $53.95 each
    11
    Tue, Sep 3
    11
    QtyArrives
    11 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • LFL100XL3M7, 3/4" Lead<br>Free Extended Shank<br>T & P Relief Valve Product Image
    $26.99 each
    $258.90 box of 10
    $25.89 each
    41
    Tue, Sep 3
    41
    QtyArrives
    41 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet) Product Image
    $45.95 each
    14
    Tue, Sep 3
    14
    QtyArrives
    14 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • LF100XL 3/4" Lead Free<br>T & P Relief Valve<br>(175 PSI, 210 F) Product Image
    $18.49 each
    $176.90 box of 10
    $17.69 each
    17
    Tue, Sep 3
    17
    QtyArrives
    17 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 1" LF40XL-7 Lead Free T&P Relief Valve (150 psi) Product Image
    $209.99 each
    $403.78 box of 2
    $201.89 each
    8
    Tue, Sep 3
    8
    QtyArrives
    8 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" NCLX-LS Domestic T&P Relief Valve Product Image
    3/4" NCLX-LS Domestic T&P Relief Valve
    SKU: 19084-0150
    Brand: Cash-Acme
    $18.95 each
    30
    Tue, Sep 3
    30
    QtyArrives
    30 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet) Product Image
    3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet)
    Contains Lead
    SKU: 19783-0150
    Brand: Cash-Acme
    (1)
    $16.95 each
    17
    Tue, Sep 3
    17
    QtyArrives
    17 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet) Product Image
    $105.95 each
    5
    Tue, Sep 3
    5
    QtyArrives
    5 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet) Product Image
    $145.95 each
    6
    Tue, Sep 3
    6
    QtyArrives
    6 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi) Product Image
    $229.99 each
    $662.07 box of 3
    $220.69 each
    5
    Tue, Sep 3
    5
    QtyArrives
    5 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet) Product Image
    1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet)
    Contains Lead
    SKU: 22894-0150
    Brand: Cash-Acme
    (1)
    $149.95 each
    Tue, Sep 10 – Thu, Sep 12
    Arrives
    Tue, Sep 10 – Thu, Sep 12
    Questions? Call 1-888-757-4774 or LiveChat Img Chat Us
  • 3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet) Product Image
    $133.95 each
    3
    Tue, Sep 3
    3
    QtyArrives
    3 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 100XL8-100210 3/4" Temperature & Pressure Relief Valve Product Image
    $42.99 each
    8
    Tue, Sep 3
    8
    QtyArrives
    8 Tue, Sep 3
    Questions? Call 1-888-757-4774
  • 3/4" LF10L-2, T & P Relief Valve, Lead Free - 150 psi Product Image
    $42.99 each
    9
    Tue, Sep 3
    9
    QtyArrives
    9 Tue, Sep 3
    Questions? Call 1-888-757-4774

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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