pilot operated relief valve by the main valve ( The relief valve) And the pilot valve ( Straight moving type relief valve) Composition. The main valve is a real relief valve, pressure pilot valve is used to detect pressure system, make the open and close the main valve, to ensure the sealing performance of pilot operated relief valve and other performance indicators, is not only strict with the valve seat sealing surface flatness and surface roughness, and the main valve of the Industrial Valves sealing surface. And strict with the valve seat sealing surface and the pilot valve valve sealing surface flatness and roughness, and strict with compression spring geometry, material and heat treatment. It can meet the requirements of specific pressure. On the normal working state: pilot valve sealing surface under the action of spring force closed, the main valve piston entry and upper chamber through the pilot valve connection, medium into the gas chamber to the main valve piston through the pilot valve, as a result of the piston in the working area is greater than the main valve disc sealing area, piston is the net force downward, to keep the main valve seal. Open: when the main valve inlet pressure rises to the set pressure, first open the pilot valve, main valve chamber through the pilot valve sealing surface of the medium, floating plug valve formation pressure difference fluctuation, move up to the main valve block valve. Close the channel to air chamber, air indoor pressure drops rapidly. When the air chamber pressure decreases to a certain extent, the main valve piston upward force is greater than the sum of downward force and friction force, and the piston moving up side by side. Return status: when the main valve inlet pressure drops to the return pressure, pilot valve first return to the seat, pilot valve sealing surface on the closed ( Outside the exhaust passage off) , floating plug valves open down to make the main entrance and the main valve piston upper air chamber of the open channel, medium through the pilot valve into the upper part of the main valve piston air chamber, the working principle of the pilot relief valve gradually increase. When the air chamber pressure increases to a certain extent, the main valve when the piston to the dint is greater than the upward force and friction force, the sum of the main valve close quickly and return to normal operation.

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