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.
Vatac 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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The Vatac Spring loaded safety valves are basicly in structures of Full Lift Safety Relief and Low Lift Safety Relief.
A full lift safety valve is one in which the disc lifts sufficiently, so that the curtain area no longer influences the discharge area. The discharge area, and therefore the capacity of the valve are subsequently determined by the bore area. This occurs when the disc lifts a distance of at least a quarter of the bore diameter. A full lift conventional safety valve is often the best choice for general steam applications.
Full-nozzles are usually incorporated in safety valves designed for process and high pressure applications, especially when the fluid is corrosive. Conversely, the semi-nozzle design consists of a seating ring fitted into the body, the top of which forms the seat of the valve. The advantage of this arrangement is that the seat can easily be replaced, without replacing the whole inlet.
In low lift valves, the disc only lifts a distance of 1/24th of the bore diameter. The discharge area is determined entirely by the position of the disc, and since the disc only lifts a small amount, the capacities tend to be much lower than those of full or high lift valves.
» Sizes: DN15 through DN500
» Body Styles: Flanged, Welded or Threaded
» Pressure Class: ANSI CL150 to CL1500, PN16 to PN260
» Materials in Carbon Steel, Stainless Steel, Duplex Steel or Bronze
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Flanged Y Strainer· Compact Design · Bolted or Threaded Cover · Perforable or Mesh Lined Stainless Steel Screens · Suitable for Liquid, Gas or Steam
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