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Classification of solenoid valve

There are closed chambers in the solenoid valve and open holes in different positions. Each hole leads to different tubing. In the middle of the cavity, the valve is the valve, and the two sides are two electromagnets. The one side of the magnet coil will be attracted to the side, and the valve is controlled by the movement of the valve to keep or leak out the different holes of the oil discharge, and the hole is often opened. The hydraulic oil will enter the different oil exhausting tubes, and then push the piston of the oil through the pressure of the oil. The piston drives the piston rod, and the piston rod drives the mechanical device. This controls the mechanical movement by controlling the current of the electromagnet.
The solenoid valves can be divided into liquid solenoid valves, air solenoid valves, steam solenoid valves, gas electromagnetic valves, oil solenoid valves, fire fighting solenoid valves, refrigeration solenoid valves, anticorrosive electromagnetic valves, high temperature solenoid valves, high pressure electromagnetically valves, pressure free electromagnetic valves, ultra low temperature electricity. Magnetic valve (cryogenic solenoid valve), vacuum solenoid valve and so on.
According to the internal structure of solenoid valve, it can be divided into pilot type, direct type, compound type, recoil type, self-supporting type, pulse type, bistable state, bidirectional type, etc. According to the different use material of the solenoid valve, it can be divided into: cast iron (gray cast iron, spheroidal graphite cast iron), copper body (cast copper, forging copper), cast steel body, all stainless steel (304, 316), non metal material (ABS, polytetrafluoroethylene). According to the pressure of medium in the pipe, the vacuum type (-0.1~0Mpa), low pressure type (0~0.8Mpa), medium pressure type (1.0~2.5Mpa), high pressure type (4.0~6.4Mpa) and ultra high pressure type (10~21Mpa) can be divided into normal temperature type (5 C ~80 C), medium temperature type (100 C ~150 C), and high temperature type (150 C ~220). At high temperature (250 ~450 C), low temperature (-40 C ~0 C), ultra low temperature (-196 C). According to the working voltage is divided into: AC voltage: AC220V 380V 110V 24V; DC voltage: DC24V 12V 6V 220V; commonly used voltage is AC220V DC24V, recommended users try to choose common voltage, special voltage supply cycle longer.
According to the protection level of solenoid valve, it can be divided into: explosion-proof, waterproof, outdoor type and so on.
Use solenoid valve: can only be used as switch volume, is DO control, can only be used for small pipe control, common in DN50 and below pipes, up very little. 1. switch mode: solenoid valve is driven by the coil, which can only be opened or closed, and the action time of the switch is short. 2. the nature of work: solenoid valve general circulation coefficient is very small, and the working pressure is very small. For example, the general 25 caliber solenoid valve circulation coefficient is much smaller than the 15 caliber electric ball valve. The solenoid valve is driven by electromagnetic coil, which is easily damaged by voltage impact. Equivalent to the role of the switch is to open and close 2 functions. Solenoid valve can be reset in general power failure, electric valve to such functions need to add reset device. 3. applicable process: solenoid valve is suitable for some special process requirements, such as leakage, special fluid medium, and so on, and the price is more expensive. The selection of type selection valve should first follow the four principles of safety, reliability, applicability and economy, and more importantly, the cost of a solenoid valve in the whole automatic control system and even the production line is negligible in the whole automatic control system. The characteristic solenoid valve is an automatic basic element used to control the direction of the fluid. It belongs to the actuator; it is usually used in mechanical control and industrial valves to control the direction of the medium so as to control the switch of the valve. Working principle solenoid valve has a closed cavity, open holes in different positions, each hole leads to different tubing, the middle of the cavity is the valve, the two sides are two electromagnets, which the magnet coil body will be attracted to the side, by controlling the movement of the body to file or leak out the different holes of oil discharge, and into the oil hole. It is often open, the hydraulic oil will enter the different oil exhaust pipes, and then through the pressure of oil to push the piston of the oil cylinder, the piston also drives the piston rod, and the piston rod drives the mechanical device. This controls the mechanical movement by controlling the current of the electromagnet. As an actuator of automatic instrument, solenoid valve has increased sharply in recent years.
The following are the general characteristics and analysis of the solenoid valve: (1) leakage is blocked, internal leakage is easy to control, and use is safe. (2) the system is simple and the computer is cheap. (3) action express, small power, light shape. (4) the adjustment precision is limited and the suitable medium is limited. (5) a variety of models and a wide range of uses.

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