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What is the difference between solenoid valve and electric valve
Source: | Author:pmt76469a | Published time: 2020-05-13 | 1009 Views | Share:
Electromagnetic valve is an industrial equipment controlled by electromagnetism. It is an automatic basic component used to control fluid. It belongs to actuator, not limited to hydraulic and pneumatic. Adjust the direction, flow, speed and other parameters of the medium in the industrial control system. The solenoid valve can cooperat
Electromagnetic valve is an industrial equipment controlled by electromagnetism. It is an automatic basic component used to control fluid. It belongs to actuator, not limited to hydraulic and pneumatic. Adjust the direction, flow, speed and other parameters of the medium in the industrial control system. The solenoid valve can cooperate with different circuits to complete the expected operation, and the accuracy and flexibility of the operation can be ensured. There are many kinds of solenoid valves. Different solenoid valves have different effects in different directions of the control system. The most commonly used ones are check valve, safety valve, direction control valve, speed regulating valve, etc.
There is a closed cavity in the solenoid valve. There are through holes in different directions. Each hole is connected with different oil pipes. The center of the cavity is a piston. There are two electromagnets on both sides. The valve body will be attracted to which side when the magnet coil is energized. After the movement of the control valve body, different oil drain holes will be opened or closed. The oil inlet hole is normally open, and the hydraulic oil will enter different oil drain pipes, Then through the oil pressure to push the piston of the oil cylinder, the piston moves the piston rod, and the piston rod moves the mechanical equipment. In this way, the mechanical movement is controlled by turning off the current of the electromagnet.
Solenoid valves at home and abroad are divided into three categories in principle: direct acting type and step-by-step child pilot type. But from the difference of disc layout and data and the difference of principle, it can be divided into six branches: direct acting diaphragm layout, step-by-step heavy disc layout, pilot diaphragm layout, direct acting piston layout, step-by-step direct acting piston layout and pilot piston layout.
The action force distance of the electric valve is larger than that of the normal valve. The action speed of the electric valve switch can be adjusted, the layout is simple and easy to protect. In the process of action, due to the buffer characteristics of the gas itself, it is not easy to be stuck and damaged, but it is necessary to have a gas source, and its control system is also messy than the electric valve. This kind of valve should be horizontal equipment in the pipeline.
Electric valve is usually composed of electric actuator and valve. The electric valve uses the electric energy as the power to drive the valve through the electric actuator, and completes the opening and closing action of the valve. Then it reaches the intention of switching the pipeline medium.
Solenoid valve is a kind of electric valve; it uses the magnetic field generated by the solenoid coil to pull the valve core, and then changes the on-off of the valve body. When the coil is powered off, the valve core will return relying on the pressure of the tension spring.
1. Switch mode:
The solenoid valve is driven by a coil and can only be opened or closed. The action time of the switch is short.
The electric valve is usually driven by a motor, which can be adjusted by simulating a certain amount of time when the opening or closing action is completed.
2. Nature of work:
The flow coefficient of solenoid valve is very small, and the working pressure difference is very small. For example, the flow coefficient of 25 caliber solenoid valve is much smaller than that of 15 caliber electric ball valve. The drive of the solenoid valve is through the solenoid coil, which is simply damaged by the voltage shock. Equivalent to the effect of the switch, that is, on and off two effects.
The electric valve is usually driven by a motor, compared with voltage shock resistance. The solenoid valve is fast opening and fast closing, usually used in small flow and small pressure, and the local electric valve with large switching frequency is on the contrary. The opening of the electric valve can be controlled, and the conditions include opening, closing, half opening and half closing. It can control the flow of medium in the pipeline, but the solenoid valve can not meet this demand.
The solenoid valve can be reset in case of power failure, and the electric valve needs such function and reset equipment.
3. Applicable technology:
The solenoid valve is suitable for some special technical requirements, such as leakage, special fluid medium, etc., and the price is more expensive.
Electric valve is usually used for conditioning, but also has switching value, such as: fan coil end.