Solenoid valve classification detailed explanation

Solenoid valve classification:

At present, there are many kinds of domestic solenoid valve products, which can satisfy the transmission of almost all fluid media. The solenoid valves collectively referred to on the market are divided into three main categories:

1) Direct-acting solenoid valve:

Principle: When energized, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat, and the valve is opened; when the power is off, the electromagnetic force disappears, the spring presses the closing member against the valve seat, and the valve is closed.

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

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

Principle: It is a combination of direct motion and pilot type. When there is no pressure difference between the inlet and the outlet, after the power is applied, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upward, and the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is turned on

The electromagnetic force leads the small valve, the pressure of the lower chamber of the main valve rises, and the pressure of the upper chamber drops, so that the main valve is pushed upward by the pressure difference; when the power is off, the pilot valve uses the spring force or the medium pressure to push the closing member and move downwards. Close the valve.

Features: It can also be operated at zero differential pressure or vacuum or high pressure, but the power is large and requires horizontal installation.

3) Pilot solenoid valve:

Principle: When energized, 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 lower part is formed around the closing member. The fluid pressure pushes the closing member upward to move the valve to open; when the power is off, the spring force leads the pilot. Hole closed, inlet pressure through

Through the bypass hole, the rapid chamber forms a lower low and high pressure difference around the valve member, and the fluid pressure pushes the closing member downward to close the valve.

Features: The upper limit of the fluid pressure range is high, it can be installed arbitrarily (customized), but the fluid pressure difference condition must be met.

Solenoid valves are divided into six sub-categories: the direct-acting diaphragm structure, the step-by-step direct diaphragm structure, the pilot diaphragm structure, the direct-acting piston structure, and the step-by-step difference in valve structure and material. Direct acting piston structure, pilot piston structure.

First, according to the dielectric properties of the solenoid valve - temperature classification

There are many different solenoid valve products to choose from: low temperature solenoid valve, low temperature solenoid valve, normal temperature solenoid valve, Chinese solenoid valve, high temperature solenoid valve and ultra high temperature solenoid valve.

Two: according to the solenoid valve media properties - pressure classification

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), ultra high pressure type (10~21Mpa)

Three: According to the material selection of the solenoid valve

Due to the wide application range of solenoid valve products, solenoid valve products used in each place require solenoid valves of different materials to adapt to the working environment. Therefore, in the choice of materials, there are many types of solenoid valves. The solenoid valve body materials commonly used in the force valve industry are:

Brass, SS304/SS316 (stainless steel), WCB (low carbon steel with carbon content 0.3-0.5%), PTFE (polytetrafluoroethylene), PVC (polyvinyl chloride), solenoid valve models are divided into: plastic solenoid valve , stainless steel solenoid valve, etc.

Four: according to the different classification of the internal structure of the solenoid valve

Pilot solenoid valve, direct acting solenoid valve, compound solenoid valve, recoil solenoid valve, pulse solenoid valve, two-way solenoid valve, etc.

According to the medium in the controlled pipeline and the working conditions, the solenoid valve can be divided into: liquid solenoid valve, gas solenoid valve, steam solenoid valve, gas solenoid valve, oil solenoid valve, fire special solenoid valve, refrigeration Solenoid valve, anti-corrosion solenoid valve, high temperature solenoid valve

, high pressure solenoid valve, no differential pressure solenoid valve, ultra low temperature solenoid valve (deep cold solenoid valve), vacuum solenoid valve, etc.

Five: classified according to the protection standards of solenoid valves

Explosion-proof type, waterproof type, outdoor type, etc.

Six: According to the physical structure and characteristics of the product

Small-diameter solenoid valve, large-diameter solenoid valve, special miniature solenoid valve (exact solenoid valve)