What are the selection bases and principles of solenoid valves?

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Solenoid valves are divided into two types of AC and DC power sources, and the industrial ones are generally AC 220V and DC 24V. Functionally, there are two types: normally open and normally closed.

Its purpose is to be used as a pipeline switch, which is the same as a faucet, but it is controlled by the circuit to achieve the function of opening or closing.

Solenoid valve: used for on-off control of liquid and gas lines, it is two-position DO control. It is generally used for the control of small pipes.

1.Switch form: The solenoid valve is driven by the coil, which can only be opened or closed, and the action time is short when the switch is opened.

2.Working nature: The general flow coefficient of solenoid valves is very small, and the working pressure difference is very small.

For example, the flow coefficient of a 25-caliber solenoid valve is much smaller than that of a 15-caliber electric ball valve. The solenoid valve is driven by a solenoid coil, which is more easily damaged by voltage shock. It is equivalent to the role of the switch, which is the two functions of opening and closing.

The solenoid valve can be reset when the power is off, and the electric valve needs to add a reset device to such a function.

3.Applicable process: solenoid valve is suitable for some special process requirements, such as leakage, special fluid medium, etc., which is more expensive.

Shengen Automation.

The selection of solenoid valves should first follow the four principles of safety, reliability, applicability and economy, and secondly, select according to the on-site conditions in six aspects (i.e., pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action modes, and special requirements).

Safety, applicability, reliability, economy, Zhenrui electromechanical.

Classification of solenoid valves: 1. Solenoid valves are divided into three categories in principle: Principle of direct-acting solenoid valve:

When energized, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat, and the valve opens; When the power is off, the electromagnetic force disappears, the spring presses the shut-off against the valve seat, and the valve closes. Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm.

Principle of step-by-step direct-acting solenoid valve: it is a combination of direct-acting and pilot-operated principle, when there is no pressure difference between the inlet and outlet, after the power is on, the electromagnetic force directly lifts the pilot valve and the main valve closure up in turn, and the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is applied, the pressure of the lower chamber of the electromagnetic pilot valve and the main valve rises, and the pressure of the upper chamber decreases, so as to use the pressure difference to push the main valve upward; When the power is off, the pilot valve uses the spring force or the pressure of the medium of the closed silver cavity car to push the shut-off and move down to close the valve.

Features: It can also operate when there is zero pressure difference or vacuum and high pressure, but the power is large, and it must be installed horizontally. Pilot Operated Solenoid Valve Principle:

When energized, the electromagnetic force opens the pilot hole, the pressure of the upper chamber drops rapidly, and a low and high pressure difference is formed around the closing piece, and the fluid pressure pushes the closing part to move upwards and the valve opens; When the power is off, the spring force closes the pilot hole, and the inlet pressure quickly forms a low and high pressure difference around the valve through the bypass hole, and the fluid pressure pushes the closing part to move down and close the valve. Features: The upper limit of the fluid pressure range is high, and it can be installed arbitrarily (customization required) but the fluid pressure differential condition must be met.

2. Solenoid valves are divided into six sub-categories from the differences in valve structure and materials and the difference in principle: direct-acting diaphragm structure, step-by-step direct-acting diaphragm structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, and pilot piston structure. 3. Solenoid valves are classified according to their functions

Water solenoid valve, steam solenoid valve, refrigeration solenoid valve, cryogenic solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, miniature solenoid valve, pulse solenoid valve, hydraulic solenoid valve, normally open solenoid valve, oil solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve, etc.