Pilot-operated type high-pressure solenoid valve

Abstract

The invention discloses a pilot-operated type high-pressure solenoid valve which comprises an electromagnetic head, a plastic upper cover and a valve body sequentially connected from top to bottom. Anelectromagnetic conduction mechanism is arranged in the electromagnetic head and the plastic upper cover, is used for realizing on and off of the pilot-operated type high-pressure solenoid valve, andcomprises a high-pressure piston cap; the high-pressure piston cap is slidably arranged in the plastic upper cover; a plastic piston is arranged in the valve body and can move in the valve body; a first through slot is formed in the plastic piston; the high-pressure piston cap is connected with the first through slot in a matching way; a limiting block is arranged on the outer wall of the high-pressure piston cap; a limiting table is arranged on the top part of the first through slot; and when the pilot-operated type high-pressure solenoid valve is at an off state, the limiting block is abutted against the limiting table. The pilot-operated type high-pressure solenoid valve provided by the invention has the advantages of fast reaction speed, good sealing effect at an off state, and difficulty in occurring a jam phenomenon.

Description

technical field [0001] The invention relates to the technical field of solenoid valves, in particular to a pilot-operated high-pressure solenoid valve. Background technique [0002] The pilot solenoid valve includes a pilot valve and a main valve, and the two are connected by a channel. When the solenoid valve coil is energized, the moving iron core and the static iron core are attracted to open the pilot valve hole. Because the external water intake of the pilot valve is smaller than the internal drainage As a result, the pressure difference produces an upward thrust, and the pilot valve floats upward; due to the opening of the pilot valve, the main valve spool generates an upward thrust due to the pressure difference because the external water intake is smaller than the internal drainage, and the main valve spool floats upward. That is, the spool of the main valve is separated from the main valve port, the main valve is opened, and the medium flows from the inlet to the ou...

AI Technical Summary

Problems solved by technology

[0004] (1) The piston and the upper cover of the valve body are generally made of stainless steel. Due to the heavy weight of the piston, the response time of the pilot solenoid valve is prolonged; and when there are gravel and other substances in the water, the stainless steel valve body upper cover and the stainless steel piston are easy to contact. The jamming phenomenon occurs, which affects the use effect and service life of the pilot solenoid valve;

[0005] (2) There is a problem of insufficient coaxiality of the internal axial fittings, which leads to the failure of the pressing surface to tightly press the medium inlet, which in turn causes the phenomenon of medium leakage caused by insufficient sealing of the pilot solenoid valve

[0006] (3) When there are gravel and other substances in the water, there is a stuck phenomenon between the piston cap and the piston, which affects the use effect of the pilot solenoid valve; in severe cases, the conduction of the pilot solenoid valve cannot be realized

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