Pilot operated safety valve

Pilot operated safety valve, also known as pulse type safety valve, is a non direct load type safety valve. It consists of a main valve and a pilot valve (also known as a secondary valve). The main valve is driven by the pressure of the medium discharged from the pilot valve. When the pressure of the medium in the system reaches the opening pressure of the pilot valve, the pilot valve opens first, and the discharged medium enters the main valve through a bypass pipe, thereby controlling the opening and closing of the main valve. The pilot operated safety valve produced by Shanghai Meiyanyi Pump Valve is a main valve that acts on the valve seat and the top of the main valve core through the supply conduit of the main valve. Due to the large force exerted by the top of the valve core being greater than the bottom (valve seat area), the valve core remains downward, and the closer the pressure in front of the valve is to the set pressure, the more tightly it closes. This self sealing structure increases with the increase of pipeline pressure and the approach to the set point under the dual sealing effect of the main valve's hard and soft materials. When the pressure in front of the valve reaches or exceeds the full pressure, the pilot valve opens, the main valve quickly opens, and the medium is discharged; When the pressure in front of the valve drops below the set pressure, the pilot valve closes and the main valve also closes accordingly. Pilot operated safety valves are suitable for high-pressure and large-diameter applications, with good sealing performance and minimal impact of back pressure on their operation.