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Show In Stock Only (211)

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Apollo Valves (166)
Bell & Gossett (13)
Caleffi (3)
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Watts (128)
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1/2" (44)
3/4" (145)
1" (84)
1" x 1-1/2" (1)
1" x 1-1/4" (1)
1-1/2" x 2" (1)
1-1/2" x 2-1/2" (2)
1-1/4" (57)
1-1/2" (60)
2" (54)

Pressure Set Point
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5 (4)
8 (2)
10 (3)
15 (24)
20 (3)
30 (46)
35 (1)
36 (5)
40 (12)
45 (12)

Capacity (BTU)
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20,000 - 30,000 (1)
100,000 - 150,000 (1)
400,000 - 500,000 (7)
500,000 - 600,000 (15)
600,000 - 700,000 (6)
700,000 - 800,000 (8)
800,000 - 900,000 (8)
900,000 - 1,000,000 (9)
1,000,000 - 2,000,000 (41)
2,000,000 - 3,000,000 (32)

Review Score
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(1)
(10)
(118)
(1)

Price Range
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$10 to $15 (2)
$15 to $20 (12)
$20 to $25 (2)
$25 to $30 (1)
$30 to $35 (1)
$35 to $40 (4)
$40 to $45 (4)
$45 to $50 (5)
$50 to $60 (8)
$60 to $70 (11)

Pressure Relief Valves

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Product Image of LFBP30 1/2" By-Pass Control Relief Valve (10-50 psi)
LFBP30 1/2" By-Pass Control Relief Valve (10-50 psi)
SKU: 0121399
Watts
SKU: 0121399
Brand: Watts
$591.75 each
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Product Image of 1" x 1-1/2" MNPT x FNPT Bronze Safety Relief Valve Packed Lever (250 psig) 513FEBJMAA0250
1" x 1-1/2" MNPT x FNPT Bronze Safety Relief Valve Packed Lever (250 psig) 513FEBJMAA0250
SKU: 513FEBJMAA0250
Apollo Valves
SKU: 513FEBJMAA0250
Brand: Apollo Valves
$566.58 each
Out of Stock
Get it by Tue, Oct 20 - Tue, Oct 27
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Product Image of 1-1/2" x 2" MNPT x FNPT Steam Bronze Safety Relief Valve Metal Seat, 15 psig, 19MHGL15
1-1/2" x 2" MNPT x FNPT Steam Bronze Safety Relief Valve Metal Seat, 15 psig, 19MHGL15
SKU: 19MHGL15
Apollo Valves
SKU: 19MHGL15
Brand: Apollo Valves
$472.76 each
Out of Stock
Get it by Tue, Oct 20 - Tue, Oct 27
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Product Image of 250-2-45, Relief Valve 2" NPT, 45 psi (3.2 kg/cm2)
250-2-45, Relief Valve 2" NPT, 45 psi (3.2 kg/cm2)
SKU: 183225
McDonnell & Miller
SKU: 183225
Brand: McDonnell & Miller
$1,242.20 each
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Product Image of 1-1/2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (150 psi)
1-1/2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (150 psi)
SKU: F121549
Watts
SKU: F121549
Brand: Watts
(3)
$2,233.21 each
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Product Image of 1" F82 Pressure Relief Valve, Lead Free (75 PSI)
1" F82 Pressure Relief Valve, Lead Free (75 PSI)
SKU: 23356-0075
Cash-Acme
SKU: 23356-0075
Brand: Cash-Acme
$89.31 each
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Product Image of 2" MNPT x FNPT Steam Bronze Safety Relief Valve Metal Seat (200 psig) 19MHHL200
2" MNPT x FNPT Steam Bronze Safety Relief Valve Metal Seat (200 psig) 19MHHL200
SKU: 19MHHL200
Apollo Valves
SKU: 19MHHL200
Brand: Apollo Valves
$827.07 each
Out of Stock
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Product Image of 19 Series 1-1/4" MNPT x 1-1/2" FNPT 3,595 LBS/HR Safety Relief Valve (125 psi)
19 Series 1-1/4" MNPT x 1-1/2" FNPT 3,595 LBS/HR Safety Relief Valve (125 psi)
SKU: 19KGFA125
Apollo Valves
SKU: 19KGFA125
Brand: Apollo Valves
$471.37 each
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Product Image of 3/4" MNPT x FNPT Bronze Relief Valve w/ 8" Element (150 psig) 18C5118150
3/4" MNPT x FNPT Bronze Relief Valve w/ 8" Element (150 psig) 18C5118150
SKU: 18C5118150
Apollo Valves
SKU: 18C5118150
Brand: Apollo Valves
$162.78 each
Out of Stock
Get it by Tue, Oct 20 - Tue, Oct 27
Out of Stock
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Product Image of 250-3/4-50, Relief Valve 3/4" NPT, 50 psi (3.5 kg/cm2)
250-3/4-50, Relief Valve 3/4" NPT, 50 psi (3.5 kg/cm2)
SKU: 181525
McDonnell & Miller
SKU: 181525
Brand: McDonnell & Miller
$163.10 each
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Product Image of 2" RVW60 1 Bronze Relief Valve, 174 psi
2" RVW60 1 Bronze Relief Valve, 174 psi
SKU: 1060810
Apollo Valves
SKU: 1060810
Brand: Apollo Valves
$1,001.58 each
Out of Stock
Get it by Tue, Oct 20 - Tue, Oct 27
Out of Stock
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Product Image of 250-3/4-36, Relief Valve 3/4" NPT, 36 psi (2.5 kg/cm2)
250-3/4-36, Relief Valve 3/4" NPT, 36 psi (2.5 kg/cm2)
SKU: 181325
McDonnell & Miller
SKU: 181325
Brand: McDonnell & Miller
$164.35 each
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Product Image of 250-2-40, Relief Valve 2" NPT, 40 psi (2.8 kg/cm2)
250-2-40, Relief Valve 2" NPT, 40 psi (2.8 kg/cm2)
SKU: 183175
McDonnell & Miller
SKU: 183175
Brand: McDonnell & Miller
$1,276.66 each
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Product Image of 3/4" Threaded Bronze Safety Relief Valve w/ Standard Outlet 130 psig, 1060430
3/4" Threaded Bronze Safety Relief Valve w/ Standard Outlet 130 psig, 1060430
SKU: 1060430
Apollo Valves
SKU: 1060430
Brand: Apollo Valves
$228.92 each
Out of Stock
Get it by Tue, Oct 20 - Tue, Oct 27
Out of Stock
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Product Image of 2" 174A Relief Valve w/ Flood Sensor Connectivity (30 psi)
2" 174A Relief Valve w/ Flood Sensor Connectivity (30 psi)
SKU: F278030
Watts
SKU: F278030
Brand: Watts
(42)
$810.94 each
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Product Image of 2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F121571
Watts
SKU: F121571
Brand: Watts
(5)
$2,703.32 each
Backorder
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Product Image of 260-1-1/2-45, Relief Valve 1-1/2" NPT, 45 psi (3.2 kg/cm2)
260-1-1/2-45, Relief Valve 1-1/2" NPT, 45 psi (3.2 kg/cm2)
SKU: 182825
McDonnell & Miller
SKU: 182825
Brand: McDonnell & Miller
$959.00 each
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Product Image of 19 Series 2" MNPT x 2-1/2" FNPT 7,557 LBS/HR Safety Relief Valve (100 psi)
19 Series 2" MNPT x 2-1/2" FNPT 7,557 LBS/HR Safety Relief Valve (100 psi)
SKU: 19KJHA100
Apollo Valves
SKU: 19KJHA100
Brand: Apollo Valves
$905.62 each
Backorder
Get it by Tue, Nov 3 - Wed, Dec 2
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Product Image of 260-1-1/2-50, Relief Valve 1-1/2 NPT, 50 psi (3.5 kg/cm2)
260-1-1/2-50, Relief Valve 1-1/2 NPT, 50 psi (3.5 kg/cm2)
SKU: 182925
McDonnell & Miller
SKU: 182925
Brand: McDonnell & Miller
$959.00 each
Backorder
Get it by Tue, Nov 3 - Wed, Dec 2
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Product Image of 1-1/2" RVW60 4,604,000 BTU Capacity Bronze Relief Valve, 50 psi
1-1/2" RVW60 4,604,000 BTU Capacity Bronze Relief Valve, 50 psi
SKU: 1060710
Apollo Valves
SKU: 1060710
Brand: Apollo Valves
$668.92 each
Backorder
Get it by Tue, Nov 3 - Wed, Dec 2
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Product Image of 1-1/2" RVW60 10,054,000 BTU Capacity Bronze Relief Valve, 125 psi
1-1/2" RVW60 10,054,000 BTU Capacity Bronze Relief Valve, 125 psi
SKU: 1060725
Apollo Valves
SKU: 1060725
Brand: Apollo Valves
$668.92 each
Backorder
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Product Image of Switch, Cord, Seal Assembly for WM264 Pump
Switch, Cord, Seal Assembly for WM264 Pump
SKU: 011-563
Zoeller
SKU: 011-563
Brand: Zoeller
$150.93 each
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Product Image of 1" MNPT x 1" FNPT RVS13 643 LBS/HR Low Pressure Steam Safety Valve (10 psi)
1" MNPT x 1" FNPT RVS13 643 LBS/HR Low Pressure Steam Safety Valve (10 psi)
SKU: 13202B10
Apollo Valves
SKU: 13202B10
Brand: Apollo Valves
$88.46 each
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Product Image of 1/2" MNPT x 1/2" FNPT Bronze Adjustable Relief Valve w/ Nitrile Disc & Seat (50-250 psi)
1/2" MNPT x 1/2" FNPT Bronze Adjustable Relief Valve w/ Nitrile Disc & Seat (50-250 psi)
SKU: 1650101
Apollo Valves
SKU: 1650101
Brand: Apollo Valves
$105.45 each
Backorder
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Product Image of 19 Series 3/4" MNPT x 1" FNPT 310 LBS/HR Safety Relief Valve (15 psi)
19 Series 3/4" MNPT x 1" FNPT 310 LBS/HR Safety Relief Valve (15 psi)
SKU: 19KEDA15
Apollo Valves
SKU: 19KEDA15
Brand: Apollo Valves
$384.69 each
In Stock
Get 1 by Thu, Oct 8
In Stock
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Product Image of 2" RVW60 5,193,000 BTU Capacity Bronze Relief Valve, 30 psi
2" RVW60 5,193,000 BTU Capacity Bronze Relief Valve, 30 psi
SKU: 1060805
Apollo Valves
SKU: 1060805
Brand: Apollo Valves
$952.09 each
Backorder
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Product Image of 2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
SKU: F384342
Watts
SKU: F384342
Brand: Watts
(5)
$1,442.62 each
Backorder
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Product Image of Relief Valve 1" NPT, 30 psi (2.1 kg/cm2)
Relief Valve 1" NPT, 30 psi (2.1 kg/cm2)
SKU: 250-1-30
McDonnell & Miller
SKU: 250-1-30
Brand: McDonnell & Miller
(1)
$122.75 each
In Stock
Get 1 by Tue, Oct 6
In Stock
Get 1 by Tue, Oct 6
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Product Image of 1/2" MNPT x 1/2" FNPT RVS52 232 LBS/HR Steam Safety Relief Valve (30 psi)
1/2" MNPT x 1/2" FNPT RVS52 232 LBS/HR Steam Safety Relief Valve (30 psi)
SKU: 10512B30
Apollo Valves
SKU: 10512B30
Brand: Apollo Valves
$99.83 each
Backorder
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Product Image of 250-3/4-15, Relief Valve 3/4" NPT, 15 psi (1 kg/cm2)
250-3/4-15, Relief Valve 3/4" NPT, 15 psi (1 kg/cm2)
SKU: 181220
McDonnell & Miller
SKU: 181220
Brand: McDonnell & Miller
$163.10 each
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Product Image of 1-1/2" LF340X-8 Lead Free Automatic Reseating Pressure Relief Valve (125 psi)
1-1/2" LF340X-8 Lead Free Automatic Reseating Pressure Relief Valve (125 psi)
SKU: F121604
Watts
SKU: F121604
Brand: Watts
$4,567.58 each
Backorder
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Product Image of 3/4" FNPT x 1" FNPT RVW61 746,000 BTU Bronze Hot Water Relief Valve (20 psi)
3/4" FNPT x 1" FNPT RVW61 746,000 BTU Bronze Hot Water Relief Valve (20 psi)
SKU: 1061402
Apollo Valves
SKU: 1061402
Brand: Apollo Valves
$222.43 each
Backorder
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Product Image of 1/2" MNPT x 1/2" FNPT RVS52 205 LBS/HR Steam Safety Relief Valve (25 psi)
1/2" MNPT x 1/2" FNPT RVS52 205 LBS/HR Steam Safety Relief Valve (25 psi)
SKU: 10512B25
Apollo Valves
SKU: 10512B25
Brand: Apollo Valves
$89.59 each
Backorder
Get it by Tue, Nov 3 - Wed, Dec 2
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Product Image of 250-1-65, Relief Valve 1" NPT, 65 psi (4.6 kg/cm2)
250-1-65, Relief Valve 1" NPT, 65 psi (4.6 kg/cm2)
SKU: 182235
McDonnell & Miller
SKU: 182235
Brand: McDonnell & Miller
$251.45 each
Backorder
Get it by Tue, Nov 3 - Wed, Dec 2
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More About Pressure Relief Valves
Pressure Relief Valves are Safety Relief Valves which protect fired and unfired hot water vessels against hazardous operating pressures. Pressure Relief Valves vary in BTU capacities, and should be selected based on the capacity of your heating system.
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