Direct-Action solenoid valve

Principle: When energized, the electromagnetic coil generates magnetic force to lift the closing part from the seat, the valve opens, the electric force disappears, the spring closes the piece on the seat, and the valve closes.

Features: In the vacuum, negative pressure, 0 pressure can work normally, but the path is generally not more than 25mm.

Step Direct-Action solenoid valve

Principle: It is a direct and pilot-type combination of the principle, when the inlet and outlet no pressure difference, after the electricity, electromagnetic force directly to the pilot small valve and the main valve closed in turn up, the valve opened. When the inlet and outlet reach the starting pressure difference, after the electricity, the electromagnetic force pilot small valve, the main valve lower chamber pressure rises, the upper chamber pressure drop, thereby using the pressure differential to push the main valve upward; When the power is off, the pilot valve uses the spring force or the medium pressure to push the closing parts, move downward and make the valve close.

Features: in 0 pressure differential or vacuum, high pressure can also be * action, but the power is large, requirements must be installed horizontally.

Pilot type solenoid valve

Principle: When energized, the electromagnetic force opens the pilot hole and the upper chamber pressure drops rapidly, in the closure around the formation of a low pressure differential, fluid pressure to push the closing piece upward movement, valve open, power off, the spring force to the pilot hole closed, the inlet pressure through the bypass hole rapid chamber in the closed valve parts around the formation of low high pressure differential, Fluid pressure pushes the closing piece downward and closes the valve.

Characteristics: The upper limit of fluid pressure range is high, can be installed arbitrarily (need to be customized) but must satisfy the fluid pressure difference condition.

2, solenoid valve from the valve structure and material differences and the principle of the difference, divided into six branches of small categories: direct motion diaphragm structure, step-by-step direct motion diaphragm structure, the pilot diaphragm structure, direct motion piston structure, step-by-step direct piston structure, the pilot piston structure.

3, solenoid valve according to function classification: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low-temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, LIQUID solenoid valve, micro solenoid valve, pulse solenoid valve, hydraulic solenoid valve often open solenoid valve, oil solenoid valve, DC solenoid valve, high-pressure solenoid valve, Explosion-proof solenoid valve.

Internal and external leaks are factors that endanger security. Other control valves usually extend the stem, which controls the rotation or movement of the spool by electric, pneumatic and hydraulic actuators. This is to solve the long-term action valve stem dynamic seal external leakage problem; the only solenoid valve is the electromagnetic force acting on the seal in the electric control valve magnetic casing inside the iron core completed, there is no dynamic seal, so the external leakage is easy to block. Electric valve torque control is not easy, easily produce internal leakage, or even pull off the stem head; the structure of solenoid valve is easy to control internal leakage, until the drop to zero. Therefore, the solenoid valve is particularly safe to use, especially for corrosive, poisonous or low temperature media.

2, the system is simple, then pick up the computer, low price

The solenoid valve itself is simple in structure and low in price, which is easy to install and maintain compared with other kinds of actuator such as regulating valve. More notably, the system is much simpler and much cheaper. Because solenoid valve is switch signal control, it is very convenient to connect with industrial control computer. In today's popularity of computers, the price of a sharp decline in the era, the advantages of solenoid valve more obvious.

3, the Action Express, the power is small, the shape is lightweight

Solenoid valve response time can be as short as several milliseconds, even the pilot solenoid valve can be controlled within dozens of milliseconds. Because of its own circuit, more sensitive than other control valves. Properly designed solenoid valve coil power Consumption is very low, is a energy-saving products, but also can do only trigger action, automatically maintain valve position, usually do not use electricity. Solenoid valve small size, not only save space, but also lightweight and beautiful.

4, adjust the precision is limited, the application medium is limited

Solenoid valve usually only two types of state, the spool can only be in two limit positions, can not be continuously adjusted, so the adjustment accuracy is also subject to a certain limit.

Solenoid valve on the medium cleanliness of high requirements, including granular media can not be applied, such as impurities must be filtered first. In addition, viscous media can not be applied, and the specific product suitable for the medium viscosity range is relatively narrow.

5, a variety of models, wide range of uses

Although the solenoid valve is congenitally deficient, the advantages are still very prominent, so the design of a variety of products to meet a variety of different needs, the use of a very wide range. Solenoid Valve Technology Progress is also around how to overcome congenital deficiencies, how to better play the inherent advantages of the deployment.