Imported electromagnetic valve working principle and classification characteristics analysis

Inlet solenoid valve Overview <br> <br> inlet solenoid valve (Electromagneticvalve) is electromagnetic control of industrial equipment, automation infrastructure element is used to control fluid is actuator, not limited to hydraulic, pneumatic. It is used to adjust the direction, flow rate, speed and other parameters of the media in the industrial control system. Imported solenoid valves can be combined with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed. There are many kinds of imported solenoid valves. Different imported solenoid valves play a role in different positions of the control system. The most commonly used ones are one-way valves, safety valves, directional control valves, and speed control valves.

Inlet solenoid valve works <br> <br> inlet solenoid valve cavity there are closed, opened holes in different positions, each aperture is connected to a different pipeline, the intermediate piston chamber, two sides is an electromagnet, which face The magnet coil energized valve body will be attracted to which side, by controlling the movement of the valve body to open or close different oil drain holes, and the oil inlet hole is normally open, the hydraulic oil will enter a different drain pipe, and then The pressure of the oil pushes the piston of the cylinder, and the piston drives the piston rod, and the piston rod drives the mechanical device. This controls the mechanical movement by controlling the on and off of the electromagnets.

Imported solenoid valve classification

1) Imported direct-acting solenoid valve:

Principle: When the power is turned on, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat and the valve opens. When the power is turned off, the electromagnetic force disappears. The spring presses the closing member against the valve seat and the valve closes.

Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.

2) Imported step-by-step direct acting solenoid valve:

Principle: It is a combination of direct acting and pilot type. When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closing part and the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is turned on, the electromagnetic force pilots the small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber decreases, so that the main valve is pushed upwards by utilizing the pressure difference; when the power is off, the pilot valve utilizes the spring. Force or medium pressure pushes the closure and moves it down to close the valve.

Features: In the zero pressure difference or vacuum, high pressure can also be * action, but the power is relatively large, requires a horizontal installation.

3) Imported pilot solenoid valve:

Principle: When the power is turned on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the upper part is formed around the closing part. The fluid pressure pushes the closing part to move upwards and the valve opens; when the power is turned off, the spring force leads the pilot. The hole is closed and the inlet pressure quickly bypasses the chamber to form a lower, upper high pressure differential around the valve closing member. The fluid pressure pushes the closing member downward and closes the valve.

Features: The upper limit of the fluid pressure range is high and can be installed arbitrarily (customization is required) but the fluid pressure difference must be met.

2. The difference and difference between the valve structure and material in the imported solenoid valve are divided into six subcategories: straight-acting diaphragm structure, step-by-step diaphragm structure, pilot diaphragm structure, and direct-acting piston structure. Step-by-step direct-acting piston structure and pilot piston structure.

3, inlet solenoid valve according to functional classification: inlet water solenoid valve, inlet steam solenoid valve, inlet cooling solenoid valve inlet cryogenic solenoid valve, gas solenoid inlet valve inlet fire solenoid valve, inlet ammonia solenoid valve, inlet gas solenoid valve , imported liquid solenoid valve, imported miniature solenoid valve, imported pulsed solenoid valve, imported hydraulic solenoid valve imported normally open solenoid valve, imported oil solenoid valve, imported DC solenoid valve, imported high-pressure solenoid valve, imported explosion-proof solenoid valve.

The main features of the imported solenoid valve
1, leaks blocked, easy to control the internal leakage, the use of internal and external leakage safety is an element of safety. Other self-control valves usually extend the valve stem and the spool, which is controlled by the electric, pneumatic and hydraulic actuators, can rotate or move. This must solve the problem of external leakage of the valve stem dynamic seal during long-term operation; only the solenoid valve is operated by the electromagnetic force acting on the core sealed in the magnetic isolation sleeve of the electric control valve. There is no dynamic seal, so the leakage is easy to block. . Electric valve torque control is not easy, easy to produce internal leakage, and even pull off the stem head; the structure of the solenoid valve is easy to control the internal leakage until it is reduced to zero. Therefore, the solenoid valve is particularly safe to use, especially for corrosive, toxic or high-low temperature media.

2, the system is simple, then the computer, the low-cost modest solenoid valve itself is simple structure, the price is low, compared to other types of actuators such as regulating valves easy to install and maintain. What is even more remarkable is that the self-contained system is much simpler and the price is much lower. Because the solenoid valve is a switch signal control, it is very convenient to connect with the industrial control computer. In today's era of widespread computer availability and sharply lower prices, the advantages of solenoid valves are even more pronounced.

3, action express, small power, light-weight solenoid valve response time can be as short as several milliseconds, even if the pilot solenoid valve can also be controlled within tens of milliseconds. Due to self-looping, it reacts more sensitively than other self-controlled valves. Well-designed solenoid valve coil power consumption is very low, is an energy-saving product; can also be achieved simply trigger action, automatically maintain the valve position, usually no power at a time. The electromagnetic valve has a small size, which saves space and is light and beautiful.

4, the adjustment accuracy is limited, for media constrained solenoid valve is usually only two kinds of switching status, the valve can only be in two extreme positions, can not be continuously adjusted, so the adjustment accuracy is also subject to certain restrictions.

Solenoid valves have high requirements for the cleanliness of the medium. The granular media cannot be applied. If impurities are present, they must be filtered out first. In addition, viscous media cannot be used, and the specific product is suitable for a relatively narrow range of media viscosity.

5, a variety of models, a wide range of uses Although solenoid valves have congenitally deficient, the advantages are still very prominent, so it is designed into a wide range of products to meet a variety of different needs, use is extremely wide. The progress of solenoid valve technology is also centered around how to overcome congenital deficiencies and how to better develop the inherent advantages.

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