The John 74 Safety Relief Valve is engineered with a pivoting disc for precise alignment to the nozzle, ensuring optimal operation. Its top guiding, unobstructed seat bore, and full lift capability guarantee the highest discharge rates, offering maximum plant protection. To handle substantial flows effectively, the inlet pipework should maintain a maximum inlet pressure drop of 3%. This valve is available in both conventional and balanced bellows types, featuring a specialized disc design tailored for liquid applications, enhancing overall valve performance.
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Body |
Bronze |
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Trim |
Stainless Steel / EPDM (-20°C to 95°C), EPDM – Hot water (-46°C to 150°C) |
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Sizes |
25, 32, 40, 50, 65, 80,100 |
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Min Temperature |
-46°C |
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Max Temperature |
260°C |
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Pressure Rating |
Variable on Size and Medium |
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Max Pressure Rating |
Variable on Size and Medium |
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Connections |
Flanged x Flanged |
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Standards |
AS 1271, Class A; BS6759 Pt 1,2,3; ASME- Boiler and Pressure Vessel Code, Section VIII |
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Options |
Lever or Dome Cap |
How to Order
The quickest way to order is to use this enquiry form or call our sales line. We will endeavour to get back to the same or next business day.
Other Valves
Other Valves
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- Air Valves
- Ball Valves
- Butterfly Valves
- Check Valves
- Globe Valves
Contact Information
Head Office Ballarat 03 5336 2113
Sydney 0411 749 507
Perth Office 08 9249 1942
Brisbane Office 0409 192 177
Adelaide Office 0418 503 570