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20,000 - 30,000 (1)
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500,000 - 600,000 (15)
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1,000,000 - 2,000,000 (43)
2,000,000 - 3,000,000 (32)

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(117)
(1)

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$10 to $15 (3)
$15 to $20 (11)
$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 (10)

Pressure Relief Valves

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Product Image of 3/4" Series LF174A Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (50 psi)
3/4" Series LF174A Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (50 psi)
SKU: F121465
Watts
SKU: F121465
Brand: Watts
$450.46 each
In Stock
Get 17 by Wed, Aug 19 - Thu, Aug 20
In Stock
Get 17 by Wed, Aug 19 - Thu, Aug 20
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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, Sep 1 - Wed, Sep 9
Out of Stock
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Product Image of 250-2-36, Relief Valve 2" NPT, 36 psi (2.5 kg/cm2)
250-2-36, Relief Valve 2" NPT, 36 psi (2.5 kg/cm2)
SKU: 183125
McDonnell & Miller
SKU: 183125
Brand: McDonnell & Miller
$1,103.29 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 2" FNPT RVW60 19,565,000 BTU Bronze Hot Water Relief Valve (150 psi)
2" FNPT RVW60 19,565,000 BTU Bronze Hot Water Relief Valve (150 psi)
SKU: 1060834
Apollo Valves
SKU: 1060834
Brand: Apollo Valves
$1,289.38 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 260-1-1/2-36, Relief Valve 1-1/2" NPT, 36 psi (2.5 kg/cm2)
260-1-1/2-36, Relief Valve 1-1/2" NPT, 36 psi (2.5 kg/cm2)
SKU: 182725
McDonnell & Miller
SKU: 182725
Brand: McDonnell & Miller
$959.00 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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 RVS52 339 LBS/HR Steam Safety Relief Valve, Polished Chrome (50 psi)
1/2" MNPT x 1/2" FNPT RVS52 339 LBS/HR Steam Safety Relief Valve, Polished Chrome (50 psi)
SKU: 10512P50
Apollo Valves
SKU: 10512P50
Brand: Apollo Valves
$125.00 each
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Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F121494
Watts
SKU: F121494
Brand: Watts
(3)
$999.39 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 250-1-40, Relief Valve 1" NPT, 40 psi (2.8 kg/cm2)
250-1-40, Relief Valve 1" NPT, 40 psi (2.8 kg/cm2)
SKU: 182030
McDonnell & Miller
SKU: 182030
Brand: McDonnell & Miller
$266.60 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 19 Series 3/4" MNPT x 3/4" FNPT Safety Relief Valve (30 psi)
19 Series 3/4" MNPT x 3/4" FNPT Safety Relief Valve (30 psi)
SKU: 19MDDA30
Apollo Valves
SKU: 19MDDA30
Brand: Apollo Valves
$360.46 each
Backorder
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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 Wed, Sep 16 - Wed, Oct 14
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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
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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 Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/4" RVW60 4,987,000 BTU Capacity Bronze Relief Valve, 80 psi
1-1/4" RVW60 4,987,000 BTU Capacity Bronze Relief Valve, 80 psi
SKU: 1060616
Apollo Valves
SKU: 1060616
Brand: Apollo Valves
$551.00 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 3/4" 530C Poppet Style Relief Valve, 100-300 psi Adjustable
3/4" 530C Poppet Style Relief Valve, 100-300 psi Adjustable
SKU: 0372273
Watts
SKU: 0372273
Brand: Watts
(1)
$132.58 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 250-2-50, Relief Valve 2" NPT, 50 psi (3.5 kg/cm2)
250-2-50, Relief Valve 2" NPT, 50 psi (3.5 kg/cm2)
SKU: 183325
McDonnell & Miller
SKU: 183325
Brand: McDonnell & Miller
$1,103.29 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 250-1-15, Relief Valve 1" NPT, 15 psi (1 kg/cm2)
250-1-15, Relief Valve 1" NPT, 15 psi (1 kg/cm2)
SKU: 181920
McDonnell & Miller
SKU: 181920
Brand: McDonnell & Miller
$266.60 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/2" x 2-1/2" MNPT x FNPT Sec VIII Liquid Bronze Safety Relief Valve (100 psig) 511HGBJMAA0100
1-1/2" x 2-1/2" MNPT x FNPT Sec VIII Liquid Bronze Safety Relief Valve (100 psig) 511HGBJMAA0100
SKU: 511HGBJMAA0100
Apollo Valves
SKU: 511HGBJMAA0100
Brand: Apollo Valves
$1,006.02 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 250-3/4-100, Relief Valve 3/4" NPT, 100 psi (7 kg/cm2)
250-3/4-100, Relief Valve 3/4" NPT, 100 psi (7 kg/cm2)
SKU: 181725
McDonnell & Miller
SKU: 181725
Brand: McDonnell & Miller
$179.24 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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, Aug 18
In Stock
Get 1 by Tue, Aug 18
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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
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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
Get it by Tue, Sep 1 - Wed, Sep 9
Out of Stock
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Product Image of 19 Series 3/4" MNPT x 1" FNPT 2,160 LBS/HR Safety Relief Valve (200 psi)
19 Series 3/4" MNPT x 1" FNPT 2,160 LBS/HR Safety Relief Valve (200 psi)
SKU: 19KEDA200
Apollo Valves
SKU: 19KEDA200
Brand: Apollo Valves
$352.70 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 3/4" MNPT x 3/4" FNPT RVS13 383 LBS/HR Low Pressure Steam Safety Relief Valve (10 psi)
3/4" MNPT x 3/4" FNPT RVS13 383 LBS/HR Low Pressure Steam Safety Relief Valve (10 psi)
SKU: 13211B10
Apollo Valves
SKU: 13211B10
Brand: Apollo Valves
$112.07 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 250-2-30, Relief Valve 2" NPT, 30 psi (2.1 kg/cm2)
250-2-30, Relief Valve 2" NPT, 30 psi (2.1 kg/cm2)
SKU: 183025
McDonnell & Miller
SKU: 183025
Brand: McDonnell & Miller
$974.21 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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 Wed, Sep 16 - Wed, Oct 14
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Product Image of 2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F121558
Watts
SKU: F121558
Brand: Watts
(3)
$2,565.64 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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, Sep 1 - Wed, Sep 9
Out of Stock
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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
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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, Sep 1 - Wed, Sep 9
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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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
$103.81 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/2" 174A Relief Valve w/ Flood Sensor Connectivity (95 psi)
1-1/2" 174A Relief Valve w/ Flood Sensor Connectivity (95 psi)
SKU: F276889
Watts
SKU: F276889
Brand: Watts
$1,859.11 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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 Wed, Sep 16 - Wed, Oct 14
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Product Image of 1" 174A Relief Valve w/ Flood Sensor Connectivity (55 psi)
1" 174A Relief Valve w/ Flood Sensor Connectivity (55 psi)
SKU: F275056
Watts
SKU: F275056
Brand: Watts
$388.05 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
1-1/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F121514
Watts
SKU: F121514
Brand: Watts
(3)
$1,572.01 each
In Stock
Get 1 by Wed, Aug 19
In Stock
Get 1 by Wed, Aug 19
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Product Image of 3/4" MNPT x 1/2" FNPT LF53-125 Poppet Type Lead Free Pressure Relief Valve (125 psi)
3/4" MNPT x 1/2" FNPT LF53-125 Poppet Type Lead Free Pressure Relief Valve (125 psi)
SKU: 0121438
Watts
SKU: 0121438
Brand: Watts
$140.46 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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
Get it by Wed, Sep 16 - Wed, Oct 14
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Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 250-1-36, Relief Valve 1" NPT, 36 psi (2.5 kg/cm2)
250-1-36, Relief Valve 1" NPT, 36 psi (2.5 kg/cm2)
SKU: 182025
McDonnell & Miller
SKU: 182025
Brand: McDonnell & Miller
$266.60 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 260-1-1/2-30, Relief Valve 1-1/2 NPT, 30 psi (2.1 kg/cm2)
260-1-1/2-30, Relief Valve 1-1/2 NPT, 30 psi (2.1 kg/cm2)
SKU: 182625
McDonnell & Miller
SKU: 182625
Brand: McDonnell & Miller
$929.08 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (80 psi)
1-1/2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (80 psi)
SKU: F121540
Watts
SKU: F121540
Brand: Watts
(3)
$2,365.05 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 2-1/2" MNPT x 2-1/2" FNPT RVS14 4676 BTU High Capacity Low Pressure Safety Valve w/ Test Gag (15 psi)
2-1/2" MNPT x 2-1/2" FNPT RVS14 4676 BTU High Capacity Low Pressure Safety Valve w/ Test Gag (15 psi)
SKU: 1420608G
Apollo Valves
SKU: 1420608G
Brand: Apollo Valves
$1,363.14 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (60 psi)
1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (60 psi)
SKU: F121491
Watts
SKU: F121491
Brand: Watts
$919.82 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (150 psi)
2" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (150 psi)
SKU: F121575
Watts
SKU: F121575
Brand: Watts
(3)
$3,293.57 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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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, Aug 20
In Stock
Get 1 by Thu, Aug 20
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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
$164.34 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
Resources
FAQs, Manuals & Videos
Articles
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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