A Solenoid Valve with Zero Pressure Difference Start and Long Life

Abstract

The invention relates to a long life solenoid valve started with zero pressure difference. The long life solenoid valve comprises a valve seat, valve covers and a sleeve fixed to the valve seat and the valve covers in a threaded connection mode. A first sealing piece is arranged between the sleeve and the valve seat for sealing; static core iron is arranged on the upper portion of the sleeve; the sleeve is connected with the static core iron together in a welding mode; a movable core iron part and a guiding part are arranged on the lower portion of the static core iron; the guiding part is arranged in an inner cavity of the movable core iron part; a reset spring is arranged between the guiding part and the static core iron; a second sealing piece is arranged in the movable core iron part; and in the valve closing state, the lower portion of the second sealing piece is attached to a valve opening formed in the valve seat in a sealed mode. The reset spring abuts against the guiding part, the borne load impact on the sealing pieces in the valve body closing process can be reduced, and liquid impact is prevented, so that the life of a valve body is long; through the scheme, the requirement for electromagnetic force of a matched coil and manufacturing cost are greatly reduced, the characteristics of zero pressure difference valve opening of a direct-action type solenoid valve are inherited, and using is more stable and reliable.

Description

technical field [0001] The invention relates to a zero-pressure-difference startup high-life 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...

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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

[0003] CN201120229694 discloses a solenoid valve. A return spring is generally provided above the seal inside the moving iron core of this type of solenoid valve to slow down the impact on the seal when the solenoid valve is closed. In this way, the seal still has a large Deformation, as the number of times the valve body is used increases, the sealing part of the seal will often have internal leakage, which will affect the performance of the valve body

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