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

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(1)
(10)
(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 1-1/4" x 1-1/2" Series 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
1-1/4" x 1-1/2" Series 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
SKU: F383368
Watts
SKU: F383368
Brand: Watts
(5)
$531.51 each
Out of Stock
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Product Image of 1-1/2" 174A Relief Valve w/ Flood Sensor Connectivity (125 psi)
1-1/2" 174A Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F276980
Watts
SKU: F276980
Brand: Watts
(5)
$732.18 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" FNPT x 1-1/2" FNPT RVW61 2,716,000 BTU Bronze Hot Water Relief Valve (30 psi)
1-1/4" FNPT x 1-1/2" FNPT RVW61 2,716,000 BTU Bronze Hot Water Relief Valve (30 psi)
SKU: 1061605
Apollo Valves
SKU: 1061605
Brand: Apollo Valves
$227.67 each
In Stock
Get 9 by Tue, Aug 18
In Stock
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Product Image of 3/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
3/4" LF174A Lead Free Relief Valve w/ Flood Sensor Connectivity (125 psi)
SKU: F121479
Watts
SKU: F121479
Brand: Watts
(5)
$357.41 each
In Stock
Get 6 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 (150 psi)
19 Series 1-1/4" MNPT x 1-1/2" FNPT 4,240 LBS/HR Safety Relief Valve (150 psi)
SKU: 19KGFA150
Apollo Valves
SKU: 19KGFA150
Brand: Apollo Valves
$450.89 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVS32 625 LBS/HR Safety Relief Valve, Polished Chrome (50 psi)
3/4" MNPT x 3/4" FNPT RVS32 625 LBS/HR Safety Relief Valve, Polished Chrome (50 psi)
SKU: 10322P50
Apollo Valves
SKU: 10322P50
Brand: Apollo Valves
(1)
$234.97 each
In Stock
Get 7 by Tue, Aug 18
In Stock
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Product Image of 3/4" 174A Relief Valve w/ Flood Sensor Connectivity (80 psi)
3/4" 174A Relief Valve w/ Flood Sensor Connectivity (80 psi)
SKU: F274612
Watts
SKU: F274612
Brand: Watts
(3)
$267.78 each
In Stock
Get 8 by Wed, Aug 19
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVW17 648,000 BTU Bronze Relief Valve (100 psi)
3/4" MNPT x 3/4" FNPT RVW17 648,000 BTU Bronze Relief Valve (100 psi)
SKU: 1740202
Apollo Valves
SKU: 1740202
Brand: Apollo Valves
$70.35 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 3,696,000 BTU Bronze Hot Water Relief Valve (30 psi)
1-1/2" FNPT x 2" FNPT RVW61 3,696,000 BTU Bronze Hot Water Relief Valve (30 psi)
SKU: 1061705
Apollo Valves
SKU: 1061705
Brand: Apollo Valves
$259.03 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (30 psi)
1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (30 psi)
SKU: F275600
Watts
SKU: F275600
Brand: Watts
(42)
$425.01 each
In Stock
Get 2 by Wed, Aug 19
In Stock
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Product Image of 1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (75 psi)
1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (75 psi)
SKU: F382821
Watts
SKU: F382821
Brand: Watts
(1)
$337.34 each
Out of Stock
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Product Image of 1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
1" x 1-1/4" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
SKU: F382870
Watts
SKU: F382870
Brand: Watts
(5)
$440.46 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 3/4" 174A Relief Valve w/ Flood Sensor Connectivity (45 psi)
3/4" 174A Relief Valve w/ Flood Sensor Connectivity (45 psi)
SKU: F274496
Watts
SKU: F274496
Brand: Watts
$206.58 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 1/2" NPT 339 LBS/HR Steam Safety Relief Valve (50 psi)
1/2" NPT 339 LBS/HR Steam Safety Relief Valve (50 psi)
SKU: 10-512-S50-VLV
Apollo Valves
SKU: 10-512-S50-VLV
Brand: Apollo Valves
$120.21 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 2,089,000 BTU Hot Water Pressure Relief Valve, 80 psi
3/4" FNPT x 1" FNPT RVW61 2,089,000 BTU Hot Water Pressure Relief Valve, 80 psi
SKU: 1061416
Apollo Valves
SKU: 1061416
Brand: Apollo Valves
$208.03 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT LF4L Poppet Type Pressure Relief Valve (150 psi)
3/4" MNPT x 3/4" FNPT LF4L Poppet Type Pressure Relief Valve (150 psi)
SKU: 0556050
Watts
SKU: 0556050
Brand: Watts
$101.68 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 3/4" FNPT RVW30 805,000 BTU Bronze Relief Valve (50 psi)
3/4" FNPT RVW30 805,000 BTU Bronze Relief Valve (50 psi)
SKU: 1030310
Apollo Valves
SKU: 1030310
Brand: Apollo Valves
$127.91 each
In Stock
Get 4 by Tue, Aug 18
In Stock
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Product Image of 3/4" F82 Medium Capacity Pressure Relief Valve, 150 PSI (Lead Free)
3/4" F82 Medium Capacity Pressure Relief Valve, 150 PSI (Lead Free)
SKU: 23341-0150
Cash-Acme
SKU: 23341-0150
Brand: Cash-Acme
$109.74 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1/2" MNPT x FNPT Series 111 Brass 125 PSI Relief Valve
1/2" MNPT x FNPT Series 111 Brass 125 PSI Relief Valve
SKU: 0915527
Watts
SKU: 0915527
Brand: Watts
$51.98 each
In Stock
Get 1 by Wed, Aug 19
In Stock
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Product Image of 1" FNPT x 1-1/4" FNPT RVW61 3,200,000 BTU Bronze Hot Water Relief Valve (75 psi)
1" FNPT x 1-1/4" FNPT RVW61 3,200,000 BTU Bronze Hot Water Relief Valve (75 psi)
SKU: 1061515
Apollo Valves
SKU: 1061515
Brand: Apollo Valves
$249.99 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 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: 1030105
Apollo Valves
SKU: 1030105
Brand: Apollo Valves
(1)
$90.19 each
In Stock
Get 6 by Tue, Aug 18
In Stock
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Product Image of 3/4" F82 Medium Capacity Pressure Relief Valve (75 PSI)
3/4" F82 Medium Capacity Pressure Relief Valve (75 PSI)
SKU: 23341-0075
Cash-Acme
SKU: 23341-0075
Brand: Cash-Acme
$81.61 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 3/4" FNPT x 1" FNPT RVW61 1,641,000 BTU Bronze Hot Water Relief Valve (60 psi)
3/4" FNPT x 1" FNPT RVW61 1,641,000 BTU Bronze Hot Water Relief Valve (60 psi)
SKU: 1061412
Apollo Valves
SKU: 1061412
Brand: Apollo Valves
$118.07 each
In Stock
Get 1 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" 174A ASME Boiler Pressure Relief Valves w/ Flood Sensor Connectivity (50 psi)
1-1/4" 174A ASME Boiler Pressure Relief Valves w/ Flood Sensor Connectivity (50 psi)
SKU: F275824
Watts
SKU: F275824
Brand: Watts
$509.83 each
In Stock
Get 5 by Wed, Aug 19
In Stock
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Product Image of 1/2" MNPT x 1/2" FNPT RVS52 151 LBS/HR Steam Safety Relief Valve (15 psi)
1/2" MNPT x 1/2" FNPT RVS52 151 LBS/HR Steam Safety Relief Valve (15 psi)
SKU: 10512B15
Apollo Valves
SKU: 10512B15
Brand: Apollo Valves
(1)
$86.36 each
In Stock
Get 10 by Tue, Aug 18
In Stock
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Product Image of 19 Series 3/4" MNPT x 1" FNPT 1,152 LBS/HR Safety Relief Valve (100 psi)
19 Series 3/4" MNPT x 1" FNPT 1,152 LBS/HR Safety Relief Valve (100 psi)
SKU: 19KEDA100
Apollo Valves
SKU: 19KEDA100
Brand: Apollo Valves
(1)
$346.25 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 3/4" FNPT x 1" FNPT RVW61 3,096,000 BTU Hot Water Pressure Relief Valve, 125 psi
3/4" FNPT x 1" FNPT RVW61 3,096,000 BTU Hot Water Pressure Relief Valve, 125 psi
SKU: 1061425
Apollo Valves
SKU: 1061425
Brand: Apollo Valves
(1)
$229.53 each
In Stock
Get 6 by Tue, Aug 18
In Stock
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Product Image of 1170-125, 3,735,000 BTU Capacity Relief Valve
1170-125, 3,735,000 BTU Capacity Relief Valve
SKU: 110135
Bell & Gossett
SKU: 110135
Brand: Bell & Gossett
$281.52 each
In Stock
Get 1 by Thu, Aug 20
In Stock
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Product Image of 3/4" F82 Medium Capacity Pressure Relief Valve, 50 PSI (Lead Free)
3/4" F82 Medium Capacity Pressure Relief Valve, 50 PSI (Lead Free)
SKU: 23341-0050
Cash-Acme
SKU: 23341-0050
Brand: Cash-Acme
$106.74 each
In Stock
Get 5 by Tue, Aug 18
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Product Image of 1170-30 1170K Relief Valve
1170-30 1170K Relief Valve
SKU: 110129
Bell & Gossett
SKU: 110129
Brand: Bell & Gossett
$265.87 each
In Stock
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Product Image of 1" FNPT RVW60 1,339,000 BTU Bronze Hot Water Relief Valve, 30 PSIG
1" FNPT RVW60 1,339,000 BTU Bronze Hot Water Relief Valve, 30 PSIG
SKU: 1060505
Apollo Valves
SKU: 1060505
Brand: Apollo Valves
$305.94 each
In Stock
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Product Image of 3/4" MNPT x 3/4" FNPT RVW40 477,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
3/4" MNPT x 3/4" FNPT RVW40 477,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
SKU: 1041705
Apollo Valves
SKU: 1041705
Brand: Apollo Valves
$59.46 each
In Stock
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Product Image of 790-75, 1,615,000 BTU Capacity Relief Valve
790-75, 1,615,000 BTU Capacity Relief Valve
SKU: 110125
Bell & Gossett
SKU: 110125
Brand: Bell & Gossett
$266.44 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 Bronze Adjustable Relief Valve w/ PTFE Disc & Seat (50-250 psi)
1/2" MNPT x 1/2" FNPT Bronze Adjustable Relief Valve w/ PTFE Disc & Seat (50-250 psi)
SKU: 1650125
Apollo Valves
SKU: 1650125
Brand: Apollo Valves
$63.00 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" x 1-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
1-1/4" x 1-1/2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
SKU: F383025
Watts
SKU: F383025
Brand: Watts
(19)
$509.78 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 2-1/2" MNPT x 2-1/2" FNPT RVS12 3,529 LBS/HR Capacity Low Pressure Relief Valve (15 psi)
2-1/2" MNPT x 2-1/2" FNPT RVS12 3,529 LBS/HR Capacity Low Pressure Relief Valve (15 psi)
SKU: 1220608
Apollo Valves
SKU: 1220608
Brand: Apollo Valves
$623.80 each
In Stock
Get 6 by Tue, Aug 18
In Stock
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Product Image of 790-125, 2,535,000 BTU Capacity Relief Valve
790-125, 2,535,000 BTU Capacity Relief Valve
SKU: 110127
Bell & Gossett
SKU: 110127
Brand: Bell & Gossett
$274.95 each
In Stock
Get 3 by Tue, Aug 18
In Stock
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Product Image of 1/2" 53L Poppet Type Pressure Relief Valve (100 psi)
1/2" 53L Poppet Type Pressure Relief Valve (100 psi)
SKU: 0190001
Watts
SKU: 0190001
Brand: Watts
(6)
$89.05 each
Out of Stock
Get it by Tue, Sep 1 - Wed, Sep 9
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Product Image of 19 Series 1-1/2" MNPT x 2" FNPT 6,616 LBS/HR Safety Relief Valve (150 psi)
19 Series 1-1/2" MNPT x 2" FNPT 6,616 LBS/HR Safety Relief Valve (150 psi)
SKU: 19KHGA150
Apollo Valves
SKU: 19KHGA150
Brand: Apollo Valves
$560.25 each
In Stock
Get 4 by Tue, Aug 18
In Stock
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Product Image of 3/4" MNPT x 1" FNPT RVW10 710,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
3/4" MNPT x 1" FNPT RVW10 710,000 BTU Hot Water Relief Valve, 30 PSIG (Brass Finish)
SKU: 1010405
Apollo Valves
SKU: 1010405
Brand: Apollo Valves
$109.79 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 1" FNPT x 1-1/4" FNPT RVW61 2,657,000 BTU Bronze Hot Water Relief Valve (60 psi)
1" FNPT x 1-1/4" FNPT RVW61 2,657,000 BTU Bronze Hot Water Relief Valve (60 psi)
SKU: 1061512
Apollo Valves
SKU: 1061512
Brand: Apollo Valves
$361.42 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 1/2" MIP Pressure Relief Valve (150 PSI), 451-12-150
1/2" MIP Pressure Relief Valve (150 PSI), 451-12-150
SKU: 451-12-150
Prier
SKU: 451-12-150
Brand: Prier
$15.90 each
Out of Stock
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Product Image of 3/4" LFTWHG2 Tankless Heater Valve Set (150 psi)
3/4" LFTWHG2 Tankless Heater Valve Set (150 psi)
SKU: 0120012
Watts
SKU: 0120012
Brand: Watts
(2)
$155.41 each
In Stock
Get 2 by Wed, Aug 19
In Stock
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Product Image of 3/4" x 1" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
3/4" x 1" Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (40 psi)
SKU: F382024
Watts
SKU: F382024
Brand: Watts
$191.51 each
In Stock
Get 5 by Tue, Aug 18
In Stock
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Product Image of 3/4" FNPT RVW60 1,399,000 BTU Bronze Hot Water Relief Valve, 60 PSIG
3/4" FNPT RVW60 1,399,000 BTU Bronze Hot Water Relief Valve, 60 PSIG
SKU: 1060412
Apollo Valves
SKU: 1060412
Brand: Apollo Valves
$179.91 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 RVS32 425 LBS/HR Safety Relief Valve, Polished Chrome (30 psi)
3/4" MNPT x 3/4" FNPT RVS32 425 LBS/HR Safety Relief Valve, Polished Chrome (30 psi)
SKU: 10322P30
Apollo Valves
SKU: 10322P30
Brand: Apollo Valves
(1)
$216.95 each
In Stock
Get 2 by Tue, Aug 18
In Stock
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Product Image of 1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (100 psi)
1-1/4" 174A Relief Valve w/ Flood Sensor Connectivity (100 psi)
SKU: F275950
Watts
SKU: F275950
Brand: Watts
$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 1-1/2" x 2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
1-1/2" x 2" Model 740 Boiler Pressure Relief Valve w/ Flood Sensor Connectivity (60 psi)
SKU: F383800
Watts
SKU: F383800
Brand: Watts
(5)
$1,007.57 each
In Stock
Get 4 by Wed, Aug 19
In Stock
Get 4 by Wed, Aug 19
Resources
FAQs, Manuals & Videos
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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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