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Apollo Valves (166)
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1/2" (43)
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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)
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1,000,000 - 2,000,000 (43)
2,000,000 - 3,000,000 (32)

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(1)
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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" FNPT x 1" FNPT RVW10 710,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
3/4" FNPT x 1" FNPT RVW10 710,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
SKU: 1010205
Apollo Valves
SKU: 1010205
Brand: Apollo Valves
$90.13 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 3/4" FNPT x 1" FNPT RVW10 1,035,000 BTU Hot Water Relief Valve, 50 PSIG (Brass Finish)
3/4" FNPT x 1" FNPT RVW10 1,035,000 BTU Hot Water Relief Valve, 50 PSIG (Brass Finish)
SKU: 1010210
Apollo Valves
SKU: 1010210
Brand: Apollo Valves
$113.96 each
In Stock
Get 3 by Wed, Aug 19
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVS13 475 LBS/HR Low Pressure Steam Safety Relief Valve (8 psi)i
3/4" MNPT x 3/4" FNPT RVS13 475 LBS/HR Low Pressure Steam Safety Relief Valve (8 psi)i
SKU: 13211B08
Apollo Valves
SKU: 13211B08
Brand: Apollo Valves
$127.62 each
In Stock
Get 2 by Tue, Aug 18
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Product Image of 1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
SKU: F382589
Watts
SKU: F382589
Brand: Watts
$467.45 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1/2" MIP Pressure Relief Valve (125 PSI), 451-12-125
1/2" MIP Pressure Relief Valve (125 PSI), 451-12-125
SKU: 451-12-125
Prier
SKU: 451-12-125
Brand: Prier
$15.89 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 19 Series 2" MNPT x 2-1/2" FNPT 10,864 LBS/HR Safety Relief Valve (150 psi)
19 Series 2" MNPT x 2-1/2" FNPT 10,864 LBS/HR Safety Relief Valve (150 psi)
SKU: 19KJHA150
Apollo Valves
SKU: 19KJHA150
Brand: Apollo Valves
$904.42 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" 3301-50 4900K Relief Valve
1-1/2" 3301-50 4900K Relief Valve
SKU: 110082
Bell & Gossett
SKU: 110082
Brand: Bell & Gossett
$1,593.28 each
In Stock
Get 1 by Tue, Aug 18
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Product Image of 1/2" MIP Pressure Relief Valve (75 PSI), 451-12-75
1/2" MIP Pressure Relief Valve (75 PSI), 451-12-75
SKU: 451-12-75
Prier
SKU: 451-12-75
Brand: Prier
$15.90 each
Out of Stock
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Product Image of 790-100, 2,075,000 BTU Capacity Relief Valve
790-100, 2,075,000 BTU Capacity Relief Valve
SKU: 110126
Bell & Gossett
SKU: 110126
Brand: Bell & Gossett
(2)
$253.39 each
In Stock
Get 6 by Thu, Aug 20
In Stock
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Product Image of 790-45, 1,065,000 BTU Capacity Relief Valve
790-45, 1,065,000 BTU Capacity Relief Valve
SKU: 110123
Bell & Gossett
SKU: 110123
Brand: Bell & Gossett
(1)
$241.37 each
In Stock
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In Stock
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Product Image of 3/4" MIP Pressure Relief Valve (75 PSI), 451-34-75
3/4" MIP Pressure Relief Valve (75 PSI), 451-34-75
SKU: 451-34-75
Prier
SKU: 451-34-75
Brand: Prier
$17.62 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 1" FNPT RVW60 3,500,000 BTU Bronze Hot Water Relief Valve, 100 PSI
1" FNPT RVW60 3,500,000 BTU Bronze Hot Water Relief Valve, 100 PSI
SKU: 1060520
Apollo Valves
SKU: 1060520
Brand: Apollo Valves
$293.33 each
In Stock
Get 4 by Tue, Aug 18
In Stock
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Product Image of 19 Series 1-1/4" MNPT x 1-1/2" FNPT 4,240 LBS/HR Safety Relief Valve, Brass Trim/Metal Seat (150 psi)
19 Series 1-1/4" MNPT x 1-1/2" FNPT 4,240 LBS/HR Safety Relief Valve, Brass Trim/Metal Seat (150 psi)
SKU: 19MGFA150
Apollo Valves
SKU: 19MGFA150
Brand: Apollo Valves
$531.63 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1/2" MNPT x 1/2" FNPT RVS52 151 LBS/HR Steam Safety Relief Valve, Polished Chrome (15 psi)
1/2" MNPT x 1/2" FNPT RVS52 151 LBS/HR Steam Safety Relief Valve, Polished Chrome (15 psi)
SKU: 10512P15
Apollo Valves
SKU: 10512P15
Brand: Apollo Valves
$87.97 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (150 psi)
1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (150 psi)
SKU: F276250
Watts
SKU: F276250
Brand: Watts
(3)
$610.71 each
Backorder
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Product Image of 1-1/2" FNPT x 2" FNPT RVW61 4,974,000 BTU Bronze Hot Water Relief Valve (45 psi)
1-1/2" FNPT x 2" FNPT RVW61 4,974,000 BTU Bronze Hot Water Relief Valve (45 psi)
SKU: 1061709
Apollo Valves
SKU: 1061709
Brand: Apollo Valves
$752.94 each
In Stock
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Product Image of 1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (100 psi)
1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (100 psi)
SKU: F121499
Watts
SKU: F121499
Brand: Watts
$910.50 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1-1/4" FNPT RVW60 3,918,000 BTU Bronze Hot Water Relief Valve (60 psi)
1-1/4" FNPT RVW60 3,918,000 BTU Bronze Hot Water Relief Valve (60 psi)
SKU: 1060612
Apollo Valves
SKU: 1060612
Brand: Apollo Valves
$682.48 each
In Stock
Get 2 by Wed, Aug 19
In Stock
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Product Image of 1-1/4" 174A ASME Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
1-1/4" 174A ASME Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
SKU: F275826
Watts
SKU: F275826
Brand: Watts
$978.44 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVS13 407 LBS/HR Low Pressure Steam Safety Relief Valve (10 psi)
3/4" MNPT x 3/4" FNPT RVS13 407 LBS/HR Low Pressure Steam Safety Relief Valve (10 psi)
SKU: 13511B10
Apollo Valves
SKU: 13511B10
Brand: Apollo Valves
$44.05 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
SKU: F382818
Watts
SKU: F382818
Brand: Watts
(1)
$339.74 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1" 1170-100, 3,060,000 BTU Capacity Relief Valve
1" 1170-100, 3,060,000 BTU Capacity Relief Valve
SKU: 110134
Bell & Gossett
SKU: 110134
Brand: Bell & Gossett
$288.83 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 3/4" MNPT x Top RVS13 333 LBS/HR Low Pressure Steam Safety Valve (5 psi)
3/4" MNPT x Top RVS13 333 LBS/HR Low Pressure Steam Safety Valve (5 psi)
SKU: 13101B05
Apollo Valves
SKU: 13101B05
Brand: Apollo Valves
$80.56 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 (125 psi)
1-1/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F121524
Watts
SKU: F121524
Brand: Watts
(5)
$1,757.18 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 3" MNPT x 3" FNPT RVS14 6843 BTU High Capacity Low Pressure Safety Valve (15 psi)
3" MNPT x 3" FNPT RVS14 6843 BTU High Capacity Low Pressure Safety Valve (15 psi)
SKU: 1420708
Apollo Valves
SKU: 1420708
Brand: Apollo Valves
$1,199.99 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1/2" LF53-125 Poppet Type Lead Free Pressure Relief Valve (125 psi)
1/2" LF53-125 Poppet Type Lead Free Pressure Relief Valve (125 psi)
SKU: 0121436
Watts
SKU: 0121436
Brand: Watts
$142.47 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" x 2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
1-1/2" x 2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
SKU: F383742
Watts
SKU: F383742
Brand: Watts
(1)
$694.36 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1/2" Wilkins P1550 MNPT x FNPT Pressure Relief Valve, 100 PSI (Lead Free)
1/2" Wilkins P1550 MNPT x FNPT Pressure Relief Valve, 100 PSI (Lead Free)
SKU: 12-P1550XL-100
Zurn
SKU: 12-P1550XL-100
Brand: Zurn
(1)
$70.96 each
In Stock
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Product Image of 2" 174A Relief Valve w/ Flood Sensor Connectivity (125 psi)
2" 174A Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F278480
Watts
SKU: F278480
Brand: Watts
(5)
$1,249.09 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 3/4" P1550 MNPT x FNPT Pressure Relief Valve (125 PSI) (Lead Free)
3/4" P1550 MNPT x FNPT Pressure Relief Valve (125 PSI) (Lead Free)
SKU: 34-P1550XL-125
Zurn
SKU: 34-P1550XL-125
Brand: Zurn
$104.99 each
In Stock
Get 68 by Wed, Aug 19
In Stock
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Product Image of 1" FNPT Bronze Hot Water Relief Valve, 60 PSIG
1" FNPT Bronze Hot Water Relief Valve, 60 PSIG
SKU: 1060512
Apollo Valves
SKU: 1060512
Brand: Apollo Valves
$373.31 each
In Stock
Get 4 by Tue, Aug 18
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Product Image of 2" 174A Relief Valve w/ Flood Sensor Connectivity (80 psi)
2" 174A Relief Valve w/ Flood Sensor Connectivity (80 psi)
SKU: F278332
Watts
SKU: F278332
Brand: Watts
$711.33 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/4" FNPT x 1-1/2" FNPT RVW61 3,343,000 BTU Bronze Hot Water Relief Valve (40 psi)
1-1/4" FNPT x 1-1/2" FNPT RVW61 3,343,000 BTU Bronze Hot Water Relief Valve (40 psi)
SKU: 1061607
Apollo Valves
SKU: 1061607
Brand: Apollo Valves
$529.43 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1/2" MIP Pressure Relief Valve (200 PSI), 451-12-200
1/2" MIP Pressure Relief Valve (200 PSI), 451-12-200
SKU: 451-12-200
Prier
SKU: 451-12-200
Brand: Prier
$15.89 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
Out of Stock
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Product Image of 1" FNPT x 1-1/4" FNPT RVW61 3,381,000 BTU Bronze Hot Water Relief Valve (80 psi)
1" FNPT x 1-1/4" FNPT RVW61 3,381,000 BTU Bronze Hot Water Relief Valve (80 psi)
SKU: 1061516
Apollo Valves
SKU: 1061516
Brand: Apollo Valves
$424.18 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
SKU: F384240
Watts
SKU: F384240
Brand: Watts
(19)
$942.14 each
Backorder
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Product Image of 1-1/4" FNPT RVW60 6,055,000 BTU Bronze Hot Water Relief Valve (100 psi)
1-1/4" FNPT RVW60 6,055,000 BTU Bronze Hot Water Relief Valve (100 psi)
SKU: 1060620
Apollo Valves
SKU: 1060620
Brand: Apollo Valves
$557.34 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1-1/4" FNPT x 1-1/2" FNPT RVW61 10,860,000 BTU Bronze Hot Water Relief Valve (160 psi)
1-1/4" FNPT x 1-1/2" FNPT RVW61 10,860,000 BTU Bronze Hot Water Relief Valve (160 psi)
SKU: 1061636
Apollo Valves
SKU: 1061636
Brand: Apollo Valves
$564.21 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 19 Series 1/2" MNPT x 3/4" FNPT 929 LBS/HR Safety Relief Valve (150 psi)
19 Series 1/2" MNPT x 3/4" FNPT 929 LBS/HR Safety Relief Valve (150 psi)
SKU: 19KDCA150
Apollo Valves
SKU: 19KDCA150
Brand: Apollo Valves
$298.19 each
In Stock
Get 2 by Fri, Aug 21
In Stock
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Product Image of 1" 174A Relief Valve w/ Flood Sensor Connectivity (45 psi)
1" 174A Relief Valve w/ Flood Sensor Connectivity (45 psi)
SKU: F275024
Watts
SKU: F275024
Brand: Watts
(3)
$647.15 each
In Stock
Get 1 by Fri, Aug 21
In Stock
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Product Image of 1/2" P1550 MNPT x FNPT Pressure Relief Valve (75 PSI) (Lead Free)
1/2" P1550 MNPT x FNPT Pressure Relief Valve (75 PSI) (Lead Free)
SKU: 12-P1550XL-75
Zurn
SKU: 12-P1550XL-75
Brand: Zurn
$91.99 each
In Stock
Get 109 by Wed, Aug 19
In Stock
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Product Image of 2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (36 psi)
2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (36 psi)
SKU: F384044
Watts
SKU: F384044
Brand: Watts
$1,102.63 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 3/4" 100XL T & P Relief Valve, Lead Free (75 psi)
3/4" 100XL T & P Relief Valve, Lead Free (75 psi)
SKU: 0124180
Watts
SKU: 0124180
Brand: Watts
$67.13 each
In Stock
Get 1 by Thu, Aug 20
In Stock
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Product Image of 3/4" MIP Commercial Grade Pressure Relief Valve & Close Nipple
3/4" MIP Commercial Grade Pressure Relief Valve & Close Nipple
SKU: H-20723-CN
Webstone
SKU: H-20723-CN
Brand: Webstone
$85.15 each
In Stock
Get 1 by Thu, Aug 20 - Fri, Aug 21
In Stock
Get 1 by Thu, Aug 20 - Fri, Aug 21
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Product Image of 3/4" FNPT x 1" FNPT RVW61 635,000 BTU Bronze Hot Water Relief Valve (15 psi)
3/4" FNPT x 1" FNPT RVW61 635,000 BTU Bronze Hot Water Relief Valve (15 psi)
SKU: 1061401
Apollo Valves
SKU: 1061401
Brand: Apollo Valves
$214.66 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1-1/4" RVW60 3,384,000 BTU Capacity, Bronze Relief Valve, 50 psi
1-1/4" RVW60 3,384,000 BTU Capacity, Bronze Relief Valve, 50 psi
SKU: 1060610
Apollo Valves
SKU: 1060610
Brand: Apollo Valves
$461.06 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 1-1/2" x 2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (75 psi)
1-1/2" x 2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F383942
Watts
SKU: F383942
Brand: Watts
(1)
$786.64 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
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Product Image of 3301-30 3301K Relief Valve
3301-30 3301K Relief Valve
SKU: 110033
Bell & Gossett
SKU: 110033
Brand: Bell & Gossett
$1,669.56 each
In Stock
Get 1 by Wed, Aug 19
In Stock
Get 1 by Wed, Aug 19
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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