Stepped direct action solenoid valve

Abstract

The invention relates to a stepped direct action solenoid valve. The stepped direct action solenoid valve comprises a valve seat, a valve cover and a sleeve pipe, and the lower portion of the sleeve pipe is connected with the valve seat and the valve cover through threads; a first sealing element is arranged between the sleeve pipe and the valve seat to conduct sealing; static core iron is arranged on the upper portion of the sleeve pipe, and the sleeve pipe and the static core iron are connected together through welding; a dynamic core iron part is arranged on the lower portion of the static core iron, and a reset spring is arranged between the dynamic core iron and the static core iron; and the valve seat comprises a valve seat inlet and a valve seat outlet, and a valve port is formed in the valve seat, an external thread is formed in the external portion of the upper portion of the valve seat, and an annular plane is arranged at the top of the valve seat. According to the stepped direct action solenoid valve, a buffering spring arranged in the core iron part can reduce load impact borne by sealing elements in the closing process of a valve body; liquid impact is prevented, and the service life of the valve body is prolonged; and through the scheme of the stepped direct action solenoid valve, requirements for electromagnetic force of a matched coil and the manufacturing cost are reduced greatly, the characteristic of zero-pressure-difference valve opening of a direct action solenoid valve is further inherited, and usage is more stable and reliable.

Description

technical field [0001] The invention relates to a step-by-step direct-acting solenoid valve, which belongs to the technical field of solenoid valves. Background technique [0002] The field of control valves often involves solenoid valves to control the on-off of the medium in the system. According to different functional requirements in the system, it can be divided into normally open type and normally closed type. According to the internal structure of the solenoid valve, it can be divided into direct-acting type and Pilot-operated, pilot-operated solenoid valves often need to drive a small orifice (pilot valve) inside the solenoid valve through the electromagnetic coil. When the pilot valve is opened, the sealing moving parts sealed on the larger orifice will be affected by the pressure difference. Open the larger valve port (main valve) to realize the on-off function of the medium in the control system. Then, for the general pilot solenoid valve, when the pressure differ...

AI Technical Summary

Problems solved by technology

[0002] The field of control valves often involves solenoid valves to control the on-off of the medium in the system. According to different functional requirements in the system, it can be divided into normally open type and normally closed type. According to the internal structure of the solenoid valve, it can be divided into direct-acting type and Pilot-operated, pilot-operated solenoid valves often need to drive a small orifice (pilot valve) inside the solenoid valve through the electromagnetic coil. When the pilot valve is opened, the sealing moving parts sealed on the larger orifice will be affected by the pressure difference. Open the larger valve port (main valve) to realize the on-off function of the medium in the control system. Then, for the general pilot solenoid valve, when the pressure difference between the inlet and outlet of the valve body is zero or the pressure difference is very small ( 1psi) is often insufficient or unable to open the valve, and for the direct-acting solenoid valve, although it can start with zero pressure difference, the electromagnetic force of the supporting coil is larger as the valve port becomes larger, so Coils tend to be bulkier and more expensive

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