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ANWVF Pilot-operated safety valves are suitable for high pressure, large diameter applications. The pilot operated safety valve has a good sealing performance, and its action is rarely affected by back pressure. The disadvantage of this type of safety valve is that its reliability is related to the main valve and the pilot valve, and the action is not as fast and reliable as the direct-acting safety valve, and the structure is complicated.
In conventional PRVs, the valve is normally held closed by a spring or similar mechanism that presses a disk or piston on a seat, which is forced open if the pressure is greater than the mechanical value of the spring. In the PORV, the valve is held shut by piping a small amount of the fluid to the rear of the sealing disk, with the pressure balanced on either side. A separate actuator on the piping releases pressure in the line if it crosses a threshold. This releases the pressure on the back of the seal, causing the valve to open.
Pressure ratings: 0.12~413 BAR
Body materials: Carbon Steel, Stainless Steel and Duplex Steel
standards: Screwed (NPT) to
Socket weld to ASME B16.11
Flanged to ASME B16.5
classes 150, 300, 600, 1500
Butt-welded ASME B16.25;
R.F ASME B16.5
* Material Test Certificate available
* Third party inspection or customer visual inspection available