China safety valve manufacturers, safety valve suppliers, safety valve factory. Pressure relief valve - A spring-loaded pressure relief valve which is designed to open to relieve excess pressure and to reclose and prevent the further flow of fluid after normal conditions have been restored. It is characterised by a rapid-opening 'pop' action or by opening in a manner generally proportional to the increase in pressure over the opening pressure. It may be used for either compressible or incompressible fluids, depending on design, adjustment, or application. This is a general term, which includes safety valves, relief valves and safety relief valves.
Relief valve - A pressure relief device actuated by inlet static pressure having a gradual lift generally proportional to the increase in pressure over opening pressure. Relief valves are commonly used in liquid systems, especially for lower capacities and thermal expansion duty. They can also be used on pumped systems as pressure overspill devices.
ZGV offers a broad line of Pressure Relief Valves covering Full Lift Safety Relief, Pilot-operated Safety Relief Valve (POSRV), Low Pressure Safety Valve (LPSV), Vacuum Pressure Safety Valve (VPSV), Low and Vacuum Pressure Safety Valve (LVPSV).
STANDARDS COMPLIANCE:
» ASME PTC 25.3, API RP 520, 521, API 526, API 527, EN ISO 4126
» ASME B16.10, EN558-1 / DIN 3202
» ASME B16.5a, ASME B16.11, ASME B1.20.1, DIN 2543~2545, EN 12627
» ISO 5208, API 598, DIN 3230, MSS SP-117
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