Electromagnetic valve with differential pressure resistance valve core

Abstract

An electromagnetic valve with a differential pressure resistance valve core is composed of a valve rod, a press cap, a V-shaped sealing ring, a gasket, a sealing pad, a nut, a valve core, a large O-shaped ring, a stifle, a sealing gasket, a valve body, a valve core seat, a small sealing ring, a spring, a small O-shaped ring, a middle O-shaped ring and an electromagnet. The valve core is in a thin-wall cylindrical shape, one end of the valve core is open, the other end is provided with an end face plate, a step connected with the valve rod is positioned in the center of the end face plate, and through holes are arranged on the periphery of the step. A blocking shoulder is arranged at the periphery of the valve core to limit journey of the valve core to improve sealing performance. Under the action of the electromagnet, an upward-moving valve on the valve core is in a close state, pressure water is filled with the valve core and a cavity communicated with the valve core, the sum of axial force stressed on the valve core is nearly zero, pressure difference inside and outside the cylinder wall of the valve core is large, axial force stressed on in the cylinder wall is enough to enable the thin wall of the valve core to expand and deform, and sealing between the valve core and the valve is reliable. When the valve core moves downwards, the valve is open, and water pressure has no side effects on the valve core.

Description

technical field [0001] The invention relates to a solenoid valve with an anti-pressure difference interference spool. Background technique [0002] Solenoid valve is a type of electric valve. It uses the magnetic field generated by the electromagnetic coil to pull the valve core, thereby changing the on-off of the valve body. When the coil is powered off, the valve core will return by the pressure of the spring. Usually the valve core in the valve body adopts a piston-type structure, that is, the circular valve core is fixed on the head of the valve stem, and the end face of the valve core coincides with the through hole of the separation layer in the valve body. Control the on-off of the valve. However, due to the large pressure difference between the two chambers of the separation layer in the valve body, if the direction of water flow is set to be consistent with the opening direction of the valve core, the locking condition of the valve will be very poor, which will eas...

AI Technical Summary

Problems solved by technology

However, due to the large pressure difference between the two chambers of the separation layer in the valve body, if the direction of water flow is set to be consistent with the opening direction of the valve core, the locking condition of the valve will be very poor, which will easily cause the gap between the through hole of the separation layer and the meshing surface of the valve core. Leakage; if the valve core is set to open against the direction of water flow, although the sealing performance of the valve can be improved, the load to open the valve will increase

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