Safety Relief Valves
ASME Section VIII — individually tested, UV stamped since 1912
The industry standard for refrigerant system overpressure protection. Every valve is precision-machined in Williamsport, PA, individually bench-tested, and UV stamped to ASME Section VIII. Available in single-piece, two-piece Quick Release cartridge, and Green Line aluminum configurations. Custom set pressures at no additional charge.
Compare the Family
Safety Relief Valves at a glance
Showing 6 of 52 models — compare all in the catalog
| Specification | Relief Valve - 800View specs | Relief Valve - 800 OPView specs | Relief Valve - 800DView specs | Relief Valve - 800D OPView specs | Relief Valve - 800QRView specs | Relief Valve - 800QR OPView specs |
|---|---|---|---|---|---|---|
| Inlet Port Size | — | — | 1/2" | 1/2" | 1/2" | 1/2" |
| Outlet Port Size | 3/4" | 3/4" | 3/4" | 3/4" | 3/4" | 3/4" |
| Material Type | — | — | Ductile | Ductile | Stainless | Stainless |
| Assembly Options | Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve | Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve | Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve | Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve | Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve | Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve |
| Available in 2 pieces | — | — | — | — | Yes | Yes |
Why Cyrus Shank
Every safety relief valve is built the same way
ASME Certified Quality
Manufactured and documented to the standards your inspectors and codes require.
Custom Set Pressures
Factory-set to your exact spec at no additional charge on any model in the family.
100% Bench Tested
Every unit is individually tested and verified before it leaves our factory.
American-Made Since 1912
Precision-machined in Williamsport, PA by a family-owned manufacturer.
Where It's Used
Safety Relief Valves for demanding refrigeration systems
Commercial Refrigeration
Supermarkets, walk-in coolers, and display case systems.
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Industrial HVAC
Chiller plants and large-tonnage mechanical systems.
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Cold Storage
Large ammonia refrigeration warehouses and distribution.
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Food Processing
Ammonia and process-cooling systems in food plants.
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