Shanghai Valve Factory (SVF) Co. Ltd

SVFModel API/ASME VIM Series -Spring Safety Valve

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Compact structure, beautiful appearance, precision casting, and smooth surface. Split type is adopted for valve seat and valve body to facilitate assembly/disassembly and maintenance. Reasonably designed disc holder and adjusting ring make the safety valve open rapidly and reseat timely; the valve seat and valve clack are coated with hard alloy by build-up welding to achieve good wear and erosion resistance and reliable seal, and prolong the service life. Spring is prestressed at constant temperature with stable rigidity and small deviation in set-pressure. Model: A21 A11 A27 A28 A41 A42 A47 A48 A61 A62 A67 A68.

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  • Design and manufacture standard:  Design and manufacture standard:
  • Design standard: ASME VIII, API520
  • Structure length: API526
  • Inside nominal diameter: 1/2 -20
  • Pressure range: 150LB-2500LB
  • Compact structure, beautiful appearance, precision casting, and smooth surface.
  • The valve seat is separable to the valve body for easy maintenance.
  • The umbrella-type disc holder works with valve seat adjusting ring for adjustment, which can effectively increase the
  • lift force, so that the valve can be fully opened rapidly at a low overpressure to discharge media;
  • The valve can rapidly reseat after overpressure relief to reach satisfactory blowdown.