Principle:, solenoid coil produces electromagnetic force from the seat to lift the pieces off, gas valve China open; power, the electromagnetic force disappears, the spring pressure to close the file on the seat, the valve closes.

Features: In a vacuum, negative pressure, zero pressure can work, but the diameter of not more than 25mm.

Distribution of direct-acting solenoid valve

Principle: It is a direct-acting and pilot-a combination of theory, there is no pressure when the inlet and outlet, the power, the electromagnetic force directly to the pilot valve and main valve off small pieces turn up the lift, the valve opens. When the inlet and outlet pressure to start when the power, the electromagnetic force small pilot valve, main valve chamber under increased pressure, the chamber pressure drops, thus the use of pressure to open up the main valve; off, the pilot valve with a spring force or push off pieces of medium pressure, move down, so that the valve closed.

Features: In the zero pressure or vacuum, high pressure also reliable action, but the power is larger, the level required to be installed.

Pilot solenoid valve

Principle: power, the electromagnetic force open the pilot hole, the chamber pressure to drop rapidly in close formation on the lower piece around the high pressure, fluid pressure to promote the closure member to move up, the valve opens; energized, the spring force to pilot hole is closed, the inlet pressure chamber through the bypass hole quickly formed around the valve off on the high under low pressure, fluid pressure drive off pieces down, close the valve.

Features: high fluid pressure limit, can be any mounting (custom), but must meet the fluid pressure conditions.

Selection of four main points of the solenoid valve

I: Applicability

Fluid piping must be used in the calibration of the electromagnetic valve series models in the same medium.

Fluid temperature must be less than the calibration temperature of the solenoid valve used.

Solenoid valve allows the liquid viscosity generally 20CST less than 20CST should be specified.

Working pressure, maximum pressure piping should be used in less than 0.04MPa as ZS, 2W, ZQDF, ZCM Series and other direct-acting and direct-acting step by step; minimum working pressure greater than 0.04MPa when the pilot can use (differential pressure) solenoid valve; maximum working pressure should be less than the maximum calibrated pressure solenoid valve; generally are one-way solenoid valve work, so pay attention to whether there is anti-pressure, check valve, if installed.

Fluid cleanliness is not high, the solenoid valve should be installed before the filter media requirements for the general cleanliness of the solenoid valve is better.

Note flow pore diameter and over; solenoid valve generally only two control switches; conditions permit, please install the bypass pipe, ease of maintenance; a water hammer phenomenon to customize the solenoid valve opening and closing time adjustment.

Pay attention to environmental effects of temperature on the solenoid General Controls Gas Valve

Supply current and power consumption should be selected according to the output capacity of the power supply voltage of about ± 10% is generally allowed, must pay attention to the exchange value of the higher starting VA.

Second, the reliability

Solenoid valve normally closed and normally open is divided into two kinds; generally used in the normally closed type, power on, power off; but in a very long time on very short time to close the normally open type of use.

Life test, type test items are generally factory, China has not exactly professional standards solenoid valve, so use caution when solenoid valve manufacturers.

Operating time is very short at higher frequencies is generally selected direct-acting, rapid series of large-diameter selection.

Third, the security

Solenoid valve is generally not waterproof, when the conditions are not allowed to use water-based, factories can be customized.

The maximum nominal pressure calibration of the solenoid valve must be more than the maximum pressure within the pipe, otherwise life will be shortened or have other unforeseen circumstances.

Corrosive liquids should be used in stainless steel type, corrosive fluids should use plastic Wang (SLF) solenoid valve.

Explosive environment must use the appropriate explosion-proof products.

Fourth, the economy

There are many solenoid valve can be generic, but meet the above three points should be chosen on the basis of most economic