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Temperature & Pressure Relief Valves

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More About Temperature & Pressure Relief Valves

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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Product Image of 3/4" NCLX-5L Domestic T&P Relief Valve
3/4" NCLX-5L Domestic T&P Relief Valve
SKU: 18821-0150
Cash-Acme
SKU: 18821-0150
Brand: Cash-Acme
(18)
$17.57 each
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Product Image of LF100XL-4 3/4" Lead Free Self Closing T & P Relief Valve
$32.88 each
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Product Image of LFLL100XL, 3/4" Lead Free Extended Shank T & P Relief Valve
$63.70 each
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Product Image of 3/4" NCLX-A Domestic T&P Relief Valve
3/4" NCLX-A Domestic T&P Relief Valve
SKU: 22348-0150
Cash-Acme
SKU: 22348-0150
Brand: Cash-Acme
(1)
$17.86 each
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Product Image of LF100XL-8,  3/4" Lead Free T & P Relief Valve
LF100XL-8, 3/4" Lead Free T & P Relief Valve
SKU: 0556001
Watts
SKU: 0556001
Brand: Watts
(8)
$38.85 each
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Product Image of 3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet)
$92.73 each
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Product Image of 3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet)
$29.63 each
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Product Image of 3/4" 40XL-5 Lead Free T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$346.92 each
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Product Image of 1" LF40XL-4 Lead Free T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$643.48 each
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Product Image of LFL100XL3M7, 3/4" Lead Free Extended Shank T & P Relief Valve
$60.14 each
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Product Image of 1" FVMX-3LS Commercial T&P Relief Valve Long Shank, Lead Free (Male Inlet)
$135.93 each
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Product Image of 3/4" 40XL-5 T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$165.61 each
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Product Image of SL100XL 3/4" Self Closing T & P Relief Valve w/ Extended Shank (150 PSI, 210F)
$74.04 each
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Product Image of 3/4" FVMX-1LS Commercial T&P Relief Valve (Male Inlet, Long Shank)
$211.71 each
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Product Image of 3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free
$31.20 each
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Product Image of 1" FVX-5L Commercial T&P Relief Valve (Female Inlet)
$341.16 each
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Product Image of 1" FVMX-5C Commercial T&P Relief Valve
1" FVMX-5C Commercial T&P Relief Valve
SKU: 16939-0150
Cash-Acme
SKU: 16939-0150
Brand: Cash-Acme
(2)
$117.32 each
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Product Image of 3/4" NCLX-8 T&P Relief Valve
3/4" NCLX-8 T&P Relief Valve
SKU: 16372-0150
Cash-Acme
SKU: 16372-0150
Brand: Cash-Acme
(1)
$39.20 each
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Product Image of LF100XL 3/4" Lead Free T & P Relief Valve (175 PSI, 210 F)
$57.62 each
Out of Stock
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Product Image of 3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet)
$164.32 each
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Product Image of 3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet)
$73.63 each
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Product Image of 3/4" FVMX-5C Commercial T&P Relief Valve (Male Inlet)
$64.62 each
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Product Image of 100XL-125210 3/4" Self Closing T & P Relief Valve w/ Test Lever (125 PSI, 210 F)
$32.53 each
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Product Image of 3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free (1" Element)
$36.27 each
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Product Image of 1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet)
$227.48 each
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Product Image of 1" x 1-1/4" F-95 Commercial T&P Relief Valve (Female Inlet)
$140.46 each
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Product Image of 1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi)
$52.14 each
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Product Image of 3/4" NCLX-LS Domestic T&P Relief Valve
3/4" NCLX-LS Domestic T&P Relief Valve
SKU: 19084-0150
Cash-Acme
SKU: 19084-0150
Brand: Cash-Acme
(2)
$30.78 each
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Product Image of 1" FVMX-4LS Commercial T&P Relief Valve Long Shank, Lead Free (Male Inlet)
$321.05 each
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Product Image of 3/4" NCLX-5S Domestic T&P Relief Valve, Extended Length Body (Lead Free)
$52.84 each
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Product Image of 1" FVMX-3C Commercial T&P Relief Valve, Lead Free (Male Inlet)
$181.73 each
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Product Image of 3/4" LF40XL-8 Lead Free T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$409.79 each
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Product Image of 3/4" MNPT x 3/4" FNPT 18C400 105,000 BTU Capacity T & P Relief Valve w/ 3" Probe (150 psi)
$33.66 each
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Product Image of 3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet)
$222.66 each
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Product Image of 1" LF40XL-7 Lead Free T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$544.76 each
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Product Image of 3/4" 40XL-M15 Lead Free T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$607.96 each
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Product Image of 3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet)
$182.87 each
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Product Image of 1" FVMX-5C Commercial T&P Relief Valve, 125 psi, Lead Free (Male Inlet)
$129.37 each
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Product Image of L100XL-100210, 3/4" Extended Shank T & P Relief Valve
$50.39 each
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Product Image of 1" LFN240X-6 Lead FreeT&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$976.34 each
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Product Image of 3/4" LF10L-2, T & P Relief Valve, Lead Free - 150 psi
$59.14 each
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Product Image of 3/4" FNPT x 3/4" FNPT Commercial ASME T&P Relief Valve (3" Element, 125 psi)
$184.88 each
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Product Image of 10L-2-75210 3/4" Brass Self Closing T & P Relief Valve w/ Test Lever (75 PSI, 210 F)
$72.96 each
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Product Image of 3/4" 40L-3 T&P Relief Valve w/ Flood Sensor Connectivity (150 psi)
$296.16 each
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Product Image of 1" Commercial ASME T&P Relief Valve (8" Element, 150 psi)
$412.86 each
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Product Image of 1" FVX-3C Commercial T&P Relief Valve, 150 PSI (Female Inlet)
$301.44 each
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Product Image of 1" LF140X-6 Lead Free Relief Valve w/ Extension Thermostat w/ Flood Sensor Connectivity (150 psi)
$878.17 each
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Product Image of LF100XL-Z11 3/4" Lead Free T & P Relief Valve (100 PSI, 180 F)
LF100XL-Z11 3/4" Lead Free T & P Relief Valve (100 PSI, 180 F)
SKU: 0121357
Watts
SKU: 0121357
Brand: Watts
$27.40 each
In Stock
Get 6 by Thu, Jun 26
In Stock
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Resources
FAQs, Manuals & Videos
Articles
More About Temperature & Pressure Relief Valves
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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Show In Stock Only (71)

Brand

Apollo Valves (27)
Cash-Acme (40)
SharkBite (1)
Watts (63)
Zurn (7)

Size

1/2" (5)
3/4" (71)
1" (41)
1-1/4" (7)
1-1/2" (12)
2" (3)
2-1/2" (1)

ASME Rating (BTU/HR)

0 - 999,999 (15)
1,000,000 - 1,499,999 (18)
1,500,000 - 1,999,999 (13)
2,000,000 - 2,499,999 (15)
3,000,000 - 3,499,999 (3)
3,500,000 - 3,999,999 (2)
4,000,000 - 4,499,999 (6)
5,000,000 - 5,499,999 (1)
6,000,000+ (7)

CSA Rating (BTU/HR)

0 - 99,999 (10)
100,000 - 199,999 (35)
200,000 - 299,999 (24)
400,000 - 499,999 (2)
500,000 - 599,999 (18)
600,000 - 699,999 (2)
700,000 - 799,999 (9)
1,000,000+ (8)

Pressure Set Point

50 (3)
75 (2)
100 (3)
125 (17)
150 (93)
175 (2)
110 (1)
30 (1)

Thermostat Length

1" (2)
1-1/2" (1)
2" (9)
2-1/8" (3)
3" (30)
3-1/2" (1)
4" (17)
4-1/16" (1)
4-1/2" (13)
4-3/4" (3)
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Review Score

(40)
(3)

Price Range

$10 to $15 (1)
$15 to $20 (2)
$20 to $25 (1)
$25 to $30 (3)
$30 to $35 (7)
$35 to $40 (6)
$40 to $45 (2)
$50 to $60 (6)
$60 to $70 (4)
$70 to $80 (6)
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