How to choose a pneumatic valve and what are the advantages of pneumatic 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 influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, 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.

Do you want an on/off valve or a control valve?

What are the advantages of pneumatic valvesPneumatic double-position butterfly valves use special pneumatic devices of the slide bucket, and the automatic opening and closing of the valve, speed adjustment and adjustment of the size of the fire position are completed. At the same time, the pneumatic components are made of high-temperature resistant materials, which can realize the valve to withstand 300 high temperatures. This kind of pneumatic component is generally relatively small, so it is very cheap.

Ducular milled cast iron is used as the bracket and connecting sleeve, because the material itself has a lubricating effect, and the service life can be guaranteed without adding additional moisturizer. The pneumatic actuator adopts a two-way output shaft and a two-way adjustment type, which is used to solve the problem of adjusting the position of the large and small fire of the double-position butterfly valve. With fluoroelastomer sealing rings, the cylinder itself can withstand 150 high temperatures.

Graphite is used as filler, which has high temperature resistance and good lubrication performance. The material of the selected stem is 2Cr13, which can meet the requirements of temperature resistance and rust resistance. The material of the connecting sleeve and bracket is ball ground cast iron, which can also play a certain lubricating role under the condition of ensuring strength.

The valve has the advantages of fast action speed and adjustable speed, high temperature resistance, suitable for frequent action, long service life and low cost, and the applicable medium is high temperature air.

The difference between pneumatic control valve and hydraulic valve.

a) Different energy sources are used.

Pneumatic components and devices can use the method of centralized air supply of air compressor station to adjust the working pressure of their respective pressure reducing valves according to the different requirements and control points. The hydraulic valves are equipped with a return line to facilitate the collection of used hydraulic oil in the oil tank. Pneumatic control valve.

The compressed air is discharged directly into the atmosphere through the exhaust port.

ii) The requirements for leakage are different.

Hydraulic valves are strict about leakage to the outside, but small leaks inside the elements are allowed. In the case of pneumatic control valves, in principle, internal leakage is not allowed, except for gap-sealed valves. Internal leakage of pneumatic valves poses a risk of accidents.

For pneumatic pipes, a small amount of leakage is allowed; Leakage of hydraulic pipelines will cause a drop in system pressure and pollution to the environment.

3) Different requirements for lubrication.

The working medium of the hydraulic system is hydraulic oil, and the hydraulic valve does not have the requirement of lubrication; The working medium of the pneumatic system is air, and the air is not lubricated, so many pneumatic valves need to be lubricated by oil mist. The parts of the valve should be made of materials that are not susceptible to water corrosion, or necessary anti-rust measures should be taken.

4) The pressure range is different.

Pneumatic valves have a lower operating pressure range than hydraulic valves. The working pressure of pneumatic valves is usually within 10 bar, and a few can reach less than 40 bar. However, the working pressure of the hydraulic valve is very high (usually within 50MPa).

If the pneumatic valve is used in excess of the maximum allowable pressure. Serious accidents tend to occur.

5) Different characteristics of use.

Generally, pneumatic valves are more compact and lightweight than hydraulic valves, easy to integrate and install, and the valves have high working frequency and long service life. Pneumatic valves are developing in the direction of low power and miniaturization, and low-power solenoid valves with only power have appeared. It can be directly connected with microcomputer and PLC programmable controller, or can be installed on the printed circuit board together with electronic devices, and the gas-electric circuit is connected through the standard board, eliminating a large number of wiring, and is suitable for pneumatic industrial manipulators, complex manufacturing assembly lines and other occasions.

When the pneumatic valve enters the middle cavity between the two pistons of the cylinder from the air source, the two pistons are separated and move to the direction of both ends of the cylinder, and the air of the air cavity at both ends is discharged through the other air port, and the two piston racks are synchronously driven to rotate the output shaft (gear) in the counterclockwise direction. Make the valve open and close.

The electric valve controls the valve body through the power supply, and the hydraulic valve passes through the hydraulic oil principle.