Analysis of differences and commonality between pneumatic solenoid valve and hydraulic solenoid valve

Analysis of differences and commonality between pneumatic solenoid valve and hydraulic solenoid valve

1. Comparative analysis of pneumatic solenoid valve and hydraulic solenoid valve

There are significant differences between pneumatic solenoid valve and hydraulic solenoid valve in many aspects. These differences are not only reflected in their working principles, but also involve many aspects such as application scenarios, performance characteristics and generality. By exploring these differences in depth, we can gain a more complete understanding of what makes these two solenoid valves unique.

2, pneumatic solenoid valve

The solenoid valve, an industrial device controlled by electromagnetism, is the basic element of automation in fluid control. As an actuator, its application is not limited to hydraulic or pneumatic. In industrial control systems, it plays a vital role in accurately adjusting the direction, flow, speed and other key parameters of the medium. By cooperating with different circuits, the solenoid valve can achieve the desired control effect, and its control accuracy and flexibility are effectively guaranteed.

3, pneumatic valve

Solenoid valve, this industrial equipment controlled by electromagnetic, its working principle lies in its internal closed chamber. The chamber is provided with through holes at different locations, each of which is connected with a specific oil pipe. A piston is placed in the center of the chamber, which is equipped with two electromagnets on both sides. When the magnet coil on one side is energized, the valve body is attracted to that side, and the different oil discharge holes are opened or closed by controlling the movement of the valve body. Since the oil inlet hole is always open, the hydraulic oil can enter the different discharge tubing and push the cylinder piston through the pressure of the oil. The movement of the piston further drives the piston rod, thus driving the movement of the mechanical device. This way of controlling the mechanical movement by controlling the current of the electromagnet is also suitable for pneumatic systems.

In production, we often use solenoid valves including two three-way, two four-way and two five-way and other types. So, what is the difference between pneumatic solenoid valve and hydraulic solenoid valve? Simply put, the main difference between the two is the type of fluid being controlled. Hydraulic solenoid valves are mainly used to control the pressure and flow direction of oil, while pneumatic solenoid valves focus on controlling the pressure and flow direction of compressed air. Although the two belong to the same category of fluid valves, and the working principle is similar, they are not universal.

4, hydraulic valve

Hydraulic valve, as a key component in the hydraulic system, its role is to control the pressure, flow and direction of the hydraulic system. By changing the position of the spool, the fluid in the hydraulic system can be precisely controlled. Similar to solenoid valves, hydraulic valves also have a variety of types, such as check valves, reversing valves, etc., to meet different control needs. In hydraulic systems, the synergy of these valves ensures the stable operation and efficient performance of the system.

5, pneumatic solenoid valve and hydraulic solenoid valve why not universal?

There are significant differences in the design of pneumatic solenoid valves and hydraulic solenoid valves, which cause them to be incompatible. Although these two solenoid valves are used to control fluids, the fluid properties, working pressures and installation environments they apply are different. Therefore, the selection must be differentiated according to the specific application scenarios to ensure the normal operation of the system and the full play of performance.

6. Energy differences

The pneumatic solenoid valve usually adopts the mode of centralized gas supply in the air compressor station, and the working pressure of the pressure reducing valve is adjusted to meet different use needs and control points. The hydraulic solenoid valve is provided with a return oil line for collecting the used hydraulic oil back to the tank. In addition, the pneumatic control valve is equipped with an exhaust port to discharge compressed air directly into the atmosphere.

7, leakage requirements difference

Hydraulic valves have strict requirements in terms of leakage to the outside, but small amounts of leakage within the components are allowed. In contrast, pneumatic control valves are different, in addition to the gap sealed valve, other types of valves in principle do not allow internal leakage. This is because the internal leakage of the pneumatic valve is at risk of causing an accident. On the other hand, the pneumatic pipe can allow a slight leak, but the leakage of the hydraulic pipe will cause the system pressure to drop and pollute the environment.

8, lubrication demand difference

The hydraulic system uses hydraulic oil as the working medium, so the hydraulic valve has no specific lubrication requirements. The pneumatic system uses air as the working medium, because the air lacks lubricity, so most pneumatic valves need to be lubricated by oil mist. In order to ensure the normal operation of pneumatic valves, all pneumatic systems are equipped with pneumatic triplets. In addition, the parts and components of the valve should be resistant to water corrosion, or take appropriate anti-rust measures to ensure its long-term reliability.

9, pressure range difference

The operating pressure range of pneumatic valves is lower than that of hydraulic valves. Generally, the operating pressure of pneumatic valves is limited to 10bar (that is, 1Mpa), and some high-performance pneumatic valves may be able to withstand pressure up to 40bar. However, the working pressure of hydraulic valves is often higher, usually not more than 50Mpa. If the pneumatic valve is used in excess of its maximum permissible pressure, it is likely to cause serious accidents.

10. Differences in application characteristics

Pneumatic valves usually have the advantage of being compact and lightweight, which makes them excellent for integrated installation. At the same time, the pneumatic valve has a high operating frequency and a long service life, which meets the needs of various industrial applications. With the development of technology, pneumatic valves are developing in the direction of low power and miniaturization, and now ultra-low power solenoid valves with a power of only 0.5W have appeared. In addition, the pneumatic valve can also be directly connected with the microcomputer and PLC programmable controller, and even installed together with electronic devices on the printed circuit board, through the standard board can easily connect the ventilation circuit, simplifying the wiring process, very suitable for pneumatic industrial manipulators and complex manufacturing assembly lines and other scenes.