Solenoid valve is used to control the traffic automation of basic components, belonging to the actuator; Not limited to hydraulic, pneumatic, solenoid valve used to control the direction of hydraulic flow, machinery in power plants are generally controlled by the hydraulic pressure plate, so the electromagnetic valve will be used by the
Working principle:
Solenoid valve with a closed cavity, in a different position with through-hole, each hole leads to different tubing, in the middle of the cavity has a valve, both sides have two pieces of electromagnet, blocked by controlling the movement of the valve body or discharge of oil leakage of different aperture, and the oil hole is always open, hydraulic fluid will enter the different oil drain, and then through the oil pressure oil to the pistons, piston, in turn, move the piston rod, piston rod drive mechanism, therefore, the mechanical movement is to control the current of the electromagnet,
1, direct acting solenoid valve principle: when the power supply starts up, the electromagnetic coil electromagnetic force shut down from the seat, the valve opens; Disappear when power off, the electromagnetic force, spring shut down on the seat, the valve closed, features: in a vacuum, negative pressure, can work normally below zero, but not greater than 25 mm in diameter,
2, the principle of distributed direct acting solenoid valve: it is a combination of direct acting and pilot operated principle, when there is no pressure difference between inlet and outlet, after electrify, electromagnetic force directly to the pilot valve and main valve closed part of the increase, in turn the valve to open, after the import and export to start the pressure difference, after electrify, the electromagnetic pilot valve, main valve inferior vena pressure rising, the cavity pressure drop, using the differential pressure to push up the main valve, pilot valve using the spring force or medium pressure push off part, move down, to close the valve, and features: in zero differential pressure or vacuum, high pressure can also be * action, but power is larger, requirements must be installed horizontally,
3, the forerunner principle of the electromagnetic valve: when the electric current, electromagnetic force to open the guide hole, the upper chamber pressure drops rapidly, around the closed form high and low pressure difference, fluid pressure boosting up close movement, the valve opening; Spring force to close the guide hole, inlet pressure through the by pass hole quickly by closing valve forms around low and high pressure difference, fluid pressure push close the valve down, features: high fluid pressure range limit, can be arbitrary installation (custom), but must satisfy the fluid pressure difference condition, should consider when using some of its features, such as dielectric properties, environmental temperature, working frequency, power and other factors,