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Working principle of solenoid valve

Writer:CondiDate:2017-2-24 10:38

Solenoid valve is an electromagnetic control of industrial equipment, is used to control the fluid automation of the basic components, are actuators; not limited to hydraulic, pneumatic. In our daily life is widely used, first of all we have a preliminary understanding of the solenoid valve, solenoid valve is composed of electromagnetic coil and core, is one or several holes containing the valve body. When the coil is energized or de-energized, the operation of the core will cause the fluid to pass through the valve body or be cut off to achieve the purpose of changing the direction of the fluid.

Solenoid valve works: the solenoid valve has a closed cavity, in different locations open through the hole, each hole leading to a different tubing, the middle of the cavity is the valve, both sides are two electromagnets, which side of the magnet coil power The valve body will be attracted to which side, by controlling the movement of the valve to stalls or leakage of different oil drain holes, and the oil hole is normally open, the hydraulic oil will enter the different drainage pipe, and then through the oil The pressure to promote the piston cylinder, the piston and drive the piston rod, piston rod drive mechanical device moving. This controls the mechanical movement by controlling the current of the electromagnet.
Solenoid valve according to the principle is divided into: direct-acting, distributed direct-acting, pilot-type three categories; according to the structure is divided into diaphragm-type solenoid valve and piston-type solenoid valve two categories.
Principle of direct acting solenoid valve:
When the power, the electromagnetic coil to produce electromagnetic force to lift the closure from the seat, the valve open; power, the electromagnetic force disappears, the spring to close the valve on the valve seat, the valve closed
Distribution of direct-acting solenoid valve works:
It is a direct-acting and pilot-type combination of the principle. Normally closed when the inlet and outlet are not pressure, the electromagnetic force after the direct opening of the pilot hole connected to the main valve piston lift up, the valve open; when the inlet and outlet to start the pressure difference, power, the electromagnetic force first Open the pilot hole, the main valve piston chamber pressure drop, so the use of pressure and electromagnetic force to pull the main piston, the valve port open; power, the spring return to close the pilot hole, the main piston chamber pressurization, to promote the main piston down Move, the valve closes. Normally open and normally closed.
Pilot operated solenoid valve works:
Normally closed --- power, the electromagnetic force to pull the pilot hole spool, the pilot hole open, the main valve piston chamber pressure drop in the main piston cavity and lower cavity on the formation of low pressure, so that the next chamber pressure The main piston to open the valve; power failure, the spring force to close the pilot hole, the main piston chamber pressurization, in the main piston cavity and lower cavity on the formation of high and low pressure, medium pressure and spring force to push the main piston, The Normally open and normally closed.
Diaphragm solenoid valve works:
At the time of energization, the electromagnetic force opens the pilot hole, the upper chamber pressure drops rapidly, the upper and lower pressure difference is formed around the closing member, the fluid pressure drives the closing member to move upward, the valve opens; when the power is off, the spring force closes the pilot hole , The inlet pressure through the bypass hole quickly chamber in the closing valve around the formation of low pressure on the lower, the fluid pressure to promote the closure of the downward movement, close the valve.
Piston solenoid valve works:
After the coil is energized due to suction, moving the core down, the sub-valve plug pressure, the sub-valve closed, the main valve cup pressure increases, when the pressure rose to a certain value, the main valve cups up and down the same pressure , Due to the role of electromagnetic force, moving the core to lose the main valve cup, press the main valve seat, the valve closed. When the coil is de-energized, the electromagnetic suction is zero, the sub-valve plug and the support core are lifted upwards due to the spring action. The auxiliary valve opens and the fluid on the main valve cup is driven by the secondary valve, reducing the effect on the main valve cup Of the pressure, when the main valve on the cup to reduce the pressure to a certain value, the use of pressure to push the main valve cup, the main valve open, the media circulation.
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TypeInfo: Technical Articles

Keywords for the information:Solenoid valve  valve  battery valve principle