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Apollo Valves (166)
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20,000 - 30,000 (1)
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500,000 - 600,000 (15)
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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 2-1/2" MNPT x 2-1/2" FNPT RVS14 4676 BTU High Capacity Low Pressure Safety Valve (15 psi)
2-1/2" MNPT x 2-1/2" FNPT RVS14 4676 BTU High Capacity Low Pressure Safety Valve (15 psi)
SKU: 1420608
Apollo Valves
SKU: 1420608
Brand: Apollo Valves
$946.13 each
In Stock
Get 8 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" RVW61 4,720,000 BTU Capacity Bronze Relief Valve, 75 psi
1-1/4" RVW61 4,720,000 BTU Capacity Bronze Relief Valve, 75 psi
SKU: 1060615
Apollo Valves
SKU: 1060615
Brand: Apollo Valves
(1)
$373.23 each
In Stock
Get 5 by Tue, Aug 18
In Stock
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Product Image of 1/2" P1550 MNPT x FNPT Pressure Relief Valve (125 PSI) (Lead Free)
1/2" P1550 MNPT x FNPT Pressure Relief Valve (125 PSI) (Lead Free)
SKU: 12-P1550XL-125
Zurn
SKU: 12-P1550XL-125
Brand: Zurn
(2)
$82.99 each
In Stock
Get 5 by Tue, Aug 18
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVS32 425 LBS/HR Safety Relief Valve, Polished Chrome (25 psi)
3/4" MNPT x 3/4" FNPT RVS32 425 LBS/HR Safety Relief Valve, Polished Chrome (25 psi)
SKU: 10322P25
Apollo Valves
SKU: 10322P25
Brand: Apollo Valves
$247.46 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1" FNPT RVW60 5,044,000 BTU Bronze Hot Water Relief Valve (150 psi)
1" FNPT RVW60 5,044,000 BTU Bronze Hot Water Relief Valve (150 psi)
SKU: 1060534
Apollo Valves
SKU: 1060534
Brand: Apollo Valves
$319.67 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 2" FNPT x 2-1/2" FNPT RVW61 6,091,000 BTU Bronze Hot Water Relief Valve (30 psi)
2" FNPT x 2-1/2" FNPT RVW61 6,091,000 BTU Bronze Hot Water Relief Valve (30 psi)
SKU: 1061805
Apollo Valves
SKU: 1061805
Brand: Apollo Valves
$746.66 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 RVW60 2,728,000 BTU Bronze Hot Water Relief Valve, 75 PSIG
1" FNPT RVW60 2,728,000 BTU Bronze Hot Water Relief Valve, 75 PSIG
SKU: 1060515
Apollo Valves
SKU: 1060515
Brand: Apollo Valves
$278.17 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1/2" MNPT Vacuum Relief Valve
1/2" MNPT Vacuum Relief Valve
SKU: 304040A
Caleffi
SKU: 304040A
Brand: Caleffi
$37.95 each
In Stock
Get 52 by Wed, Aug 19
In Stock
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Product Image of 3/4" MNPT x FNPT Bronze Hot Water Safety Relief Valve (45 psig) 1041709
3/4" MNPT x FNPT Bronze Hot Water Safety Relief Valve (45 psig) 1041709
SKU: 1041709
Apollo Valves
SKU: 1041709
Brand: Apollo Valves
$62.76 each
In Stock
Get 3 by Wed, Aug 19
In Stock
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Product Image of 1-1/4" RVW60 2,316,000 BTU Capacity Bronze Relief Valve, 30 psi
1-1/4" RVW60 2,316,000 BTU Capacity Bronze Relief Valve, 30 psi
SKU: 1060605
Apollo Valves
SKU: 1060605
Brand: Apollo Valves
$384.41 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" FNPT x 1-1/2" FNPT RVW61 3,969,000 BTU Bronze Hot Water Relief Valve (50 psi)
1-1/4" FNPT x 1-1/2" FNPT RVW61 3,969,000 BTU Bronze Hot Water Relief Valve (50 psi)
SKU: 1061610
Apollo Valves
SKU: 1061610
Brand: Apollo Valves
$227.67 each
In Stock
Get 2 by Tue, Aug 18
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Product Image of 1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (125 psi)
1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F276050
Watts
SKU: F276050
Brand: Watts
(5)
$732.33 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
Out of Stock
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Product Image of 3/4" FNPT x 1" FNPT RVW61 3,655,000 BTU Bronze Hot Water Relief Valve (150 psi)
3/4" FNPT x 1" FNPT RVW61 3,655,000 BTU Bronze Hot Water Relief Valve (150 psi)
SKU: 1061434
Apollo Valves
SKU: 1061434
Brand: Apollo Valves
$224.25 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 415M1-015 3/4" Steam Safety Relief Valve (Brass)
415M1-015 3/4" Steam Safety Relief Valve (Brass)
SKU: 0346045
Watts
SKU: 0346045
Brand: Watts
$120.47 each
In Stock
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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: 10512S30
Apollo Valves
SKU: 10512S30
Brand: Apollo Valves
$83.98 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1" FNPT x 1-1/4" FNPT RVW61 5,011,000 BTU Bronze Hot Water Relief Valve (125 psi)
1" FNPT x 1-1/4" FNPT RVW61 5,011,000 BTU Bronze Hot Water Relief Valve (125 psi)
SKU: 1061525
Apollo Valves
SKU: 1061525
Brand: Apollo Valves
$279.99 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 3/4" FNPT x 1" FNPT RVW61 2,536,000 BTU Bronze Hot Water Relief Valve (100 psi)
3/4" FNPT x 1" FNPT RVW61 2,536,000 BTU Bronze Hot Water Relief Valve (100 psi)
SKU: 1061420
Apollo Valves
SKU: 1061420
Brand: Apollo Valves
$216.49 each
In Stock
Get 5 by Wed, Aug 19
In Stock
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Product Image of 3/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (100 psi)
3/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (100 psi)
SKU: F121475
Watts
SKU: F121475
Brand: Watts
$252.09 each
In Stock
Get 7 by Wed, Aug 19
In Stock
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Product Image of 1" FNPT RVW60 1,956,000 BTU Bronze Hot Water Relief Valve, 50 PSIG
1" FNPT RVW60 1,956,000 BTU Bronze Hot Water Relief Valve, 50 PSIG
SKU: 1060510
Apollo Valves
SKU: 1060510
Brand: Apollo Valves
$306.18 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" 174A Relief Valve w/ Flood Sensor Connectivity (30 psi)
1-1/2" 174A Relief Valve w/ Flood Sensor Connectivity (30 psi)
SKU: F276500
Watts
SKU: F276500
Brand: Watts
(42)
$1,135.11 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVW30 550,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
3/4" MNPT x 3/4" FNPT RVW30 550,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
SKU: 1030305
Apollo Valves
SKU: 1030305
Brand: Apollo Valves
(2)
$101.23 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1/2" P1500XL MNPT x FNPT Pressure Relief Valve (Lead Free)
1/2" P1500XL MNPT x FNPT Pressure Relief Valve (Lead Free)
SKU: 12-P1500XL
Zurn
SKU: 12-P1500XL
Brand: Zurn
(3)
$109.99 each
In Stock
Get 17 by Thu, Aug 20
In Stock
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Product Image of 3/4" 3L-125 Poppet Type Pressure Relief Valve w/ Test Lever (125 psi)
3/4" 3L-125 Poppet Type Pressure Relief Valve w/ Test Lever (125 psi)
SKU: 0011640
Watts
SKU: 0011640
Brand: Watts
$91.48 each
Backorder
Get it by Wed, Sep 9 - Wed, Sep 16
Backorder
Get it by Wed, Sep 9 - Wed, Sep 16
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Product Image of 1" 174A ASME Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (100 psi)
1" 174A ASME Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (100 psi)
SKU: F275264
Watts
SKU: F275264
Brand: Watts
$371.55 each
Backorder
Get it by Wed, Sep 16 - Wed, Oct 14
Backorder
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Product Image of 1-1/2" FNPT x 2" FNPT RVW61 6,252,000 BTU Bronze Hot Water Relief Valve (60 psi)
1-1/2" FNPT x 2" FNPT RVW61 6,252,000 BTU Bronze Hot Water Relief Valve (60 psi)
SKU: 1061712
Apollo Valves
SKU: 1061712
Brand: Apollo Valves
$800.16 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" FNPT x 1-1/2" FNPT RVW61 5,535,000 BTU Bronze Relief Valve (75 psi)
1-1/4" FNPT x 1-1/2" FNPT RVW61 5,535,000 BTU Bronze Relief Valve (75 psi)
SKU: 1061615
Apollo Valves
SKU: 1061615
Brand: Apollo Valves
$200.59 each
In Stock
Get 6 by Tue, Aug 18
In Stock
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Product Image of 1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
1" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F121504
Watts
SKU: F121504
Brand: Watts
(5)
$687.17 each
In Stock
Get 2 by Wed, Aug 19
In Stock
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Product Image of 1/2" x 3/4" FNPT Safety Valve for Solar Heating Systems (90 psi Preset)
1/2" x 3/4" FNPT Safety Valve for Solar Heating Systems (90 psi Preset)
SKU: 253046
Caleffi
SKU: 253046
Brand: Caleffi
$58.15 each
In Stock
Get 28 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" FNPT x 2" FNPT RVW61 7,531,000 BTU Bronze Hot Water Relief Valve (75 psi)
1-1/2" FNPT x 2" FNPT RVW61 7,531,000 BTU Bronze Hot Water Relief Valve (75 psi)
SKU: 1061715
Apollo Valves
SKU: 1061715
Brand: Apollo Valves
(1)
$688.95 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" FNPT x 2" FNPT RVW61 5,400,000 BTU Bronze Hot Water Relief Valve (50 psi)
1-1/2" FNPT x 2" FNPT RVW61 5,400,000 BTU Bronze Hot Water Relief Valve (50 psi)
SKU: 1061710
Apollo Valves
SKU: 1061710
Brand: Apollo Valves
$956.39 each
In Stock
Get 5 by Tue, Aug 18
In Stock
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Product Image of 1" FNPT RVW60 4,272,000 BTU Bronze Hot Water Relief Valve (125 psi)
1" FNPT RVW60 4,272,000 BTU Bronze Hot Water Relief Valve (125 psi)
SKU: 1060525
Apollo Valves
SKU: 1060525
Brand: Apollo Valves
$293.33 each
In Stock
Get 2 by Tue, Aug 18
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Product Image of 3/4" 530C Poppet Style Relief Valve, 100-300 psi Adjustable (Lead Free)
3/4" 530C Poppet Style Relief Valve, 100-300 psi Adjustable (Lead Free)
SKU: 0121626
Watts
SKU: 0121626
Brand: Watts
$129.41 each
In Stock
Get 3 by Wed, Aug 19
In Stock
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Product Image of 3/4"LF3L Poppet Type Pressure Relief Valve, 100 psi, Test Lever (Lead Free)
3/4"LF3L Poppet Type Pressure Relief Valve, 100 psi, Test Lever (Lead Free)
SKU: 0121327
Watts
SKU: 0121327
Brand: Watts
$112.11 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1" 1170-50, ASME Safety Relief Valve
1" 1170-50, ASME Safety Relief Valve
SKU: 110132
Bell & Gossett
SKU: 110132
Brand: Bell & Gossett
$286.77 each
In Stock
Get 2 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 (75 psi)
2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F384442
Watts
SKU: F384442
Brand: Watts
(1)
$1,158.26 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 3/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
3/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F121470
Watts
SKU: F121470
Brand: Watts
(3)
$319.57 each
In Stock
Get 6 by Wed, Aug 19
In Stock
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Product Image of 2" FNPT x 2-1/2" FNPT RVW61 10,305,000 BTU Bronze Hot Water Relief Valve (60 psi)
2" FNPT x 2-1/2" FNPT RVW61 10,305,000 BTU Bronze Hot Water Relief Valve (60 psi)
SKU: 1061812
Apollo Valves
SKU: 1061812
Brand: Apollo Valves
$1,267.00 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 3/4" x 1" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
3/4" x 1" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
SKU: F382264
Watts
SKU: F382264
Brand: Watts
(1)
$350.66 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 1/2" MNPT x FNPT Series 111 Brass 150 PSI Relief Valve
1/2" MNPT x FNPT Series 111 Brass 150 PSI Relief Valve
SKU: 0915587
Watts
SKU: 0915587
Brand: Watts
$70.88 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (80 psi)
1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (80 psi)
SKU: F275828
Watts
SKU: F275828
Brand: Watts
$1,007.25 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" RVW60 3,151,000 BTU Capacity Bronze Relief Valve, 30 psi
1-1/2" RVW60 3,151,000 BTU Capacity Bronze Relief Valve, 30 psi
SKU: 1060705
Apollo Valves
SKU: 1060705
Brand: Apollo Valves
$643.18 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" RVW60 7,390,000 BTU Capacity, Bronze Relief Valve, 125 psi
1-1/4" RVW60 7,390,000 BTU Capacity, Bronze Relief Valve, 125 psi
SKU: 1060625
Apollo Valves
SKU: 1060625
Brand: Apollo Valves
$452.01 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 2" 174A Relief Valve w/ Flood Sensor Connectivity (75 psi)
2" 174A Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F278330
Watts
SKU: F278330
Brand: Watts
(3)
$1,135.21 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1" FNPT x 1-1/4" FNPT RVW61 6,278,000 BTU Bronze Hot Water Relief Valve (160 psi)
1" FNPT x 1-1/4" FNPT RVW61 6,278,000 BTU Bronze Hot Water Relief Valve (160 psi)
SKU: 1061536
Apollo Valves
SKU: 1061536
Brand: Apollo Valves
$370.33 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1-1/2" FNPT x 2" FNPT RVW61 11,792,000 BTU Bronze Hot Water Relief Valve (125 psi)
1-1/2" FNPT x 2" FNPT RVW61 11,792,000 BTU Bronze Hot Water Relief Valve (125 psi)
SKU: 1061725
Apollo Valves
SKU: 1061725
Brand: Apollo Valves
$766.00 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 1-1/4" FNPT x 1-1/2" FNPT RVW61 7,101,000 BTU Bronze Hot Water Relief Valve (100 psi)
1-1/4" FNPT x 1-1/2" FNPT RVW61 7,101,000 BTU Bronze Hot Water Relief Valve (100 psi)
SKU: 1061620
Apollo Valves
SKU: 1061620
Brand: Apollo Valves
$589.09 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
2" x 2-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (45 psi)
SKU: F384242
Watts
SKU: F384242
Brand: Watts
(1)
$1,085.80 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" RVW60 8,725,000 BTU Capacity Bronze Relief Valve, 150 psi
1-1/4" RVW60 8,725,000 BTU Capacity Bronze Relief Valve, 150 psi
SKU: 1060634
Apollo Valves
SKU: 1060634
Brand: Apollo Valves
$452.01 each
In Stock
Get 2 by Wed, Aug 19
In Stock
Get 2 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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