Detailed explanation of the Structure and Operation of Two-position Five-way pilot-operated Pneumatic Solenoid Valve
The two-position five-way pilot-operated pneumatic solenoid valve drives the valve core to change direction rapidly through the pilot valve, completing the action within 0.05 seconds. Combined with the spring and gas reset design, it not only enhances stability but also reduces working pressure, making pneumatic control more efficient and reliable.
①components and principles of a two-position five-way pilot-operated pneumatic solenoid valve
*The composition of the solenoid valve
The two-position five-way pilot-operated pneumatic solenoid valve is composed of three major components: the pilot valve, the valve body and core assembly, and the rear cover assembly, as shown in Figure 1. The name of this valve stems from its unique working characteristics. The so-called "two positions" refer to the fact that the valve core has two working positions and can move left and right under the action of air pressure. When not powered, the valve core will remain at the position shown in Figure 2. When powered on, it will move to the position shown in Figure 3. The "five-way" indicates that the solenoid valve is equipped with five working holes: A, B, R, P, and S. Among them, the P hole is usually used as the air inlet hole of the valve, while the A and B holes are connected to the cylinder or other pneumatic components through joints. The R and S holes serve as exhaust holes, used to discharge gas when the valve core position is switched.
*The working principle and characteristics of solenoid valves
Compared with direct-acting solenoid valves, the design of pilot valves enables the movement of the valve core to be driven by adding direct-acting solenoid valves on one or both sides of the valve body when a smaller power coil cannot directly drive the valve core to reverse direction. This type of valve that achieves reversing by adding a direct-acting solenoid valve is called a pilot-operated solenoid valve. Furthermore, "pneumatic" means that the solenoid valve uses clean compressed gas as the working medium. This design not only extends the service life of the valve but also reduces the minimum working pressure, thereby enhancing the customer's user experience. It has been proven through practice that although the use of springs or compressed air alone is theoretically feasible, to ensure the stability and reliability of the valve, the widely adopted method at present is the combination of springs and gas reset. This design not only extends the service life of the valve but also reduces the minimum working pressure, thereby enhancing the customer's user experience.
②Working details and precautions of solenoid valves
*Valve core reversing process
Next, we will delve into the working principle of solenoid valves. First of all, we will not delve into the internal working mechanism of the pilot valve, but understand it as a whole. When the coil is energized, the pilot valve will output thrust to drive the valve core to move. When the power is cut off, the thrust is zero. When the pilot valve is energized, the valve core will rapidly move towards the rear cover under the action of the pilot valve piston. This reversing process is usually completed within 0.05 seconds. During the reversing process of the valve core, two key points need to be noted. Firstly, when the valve core is transformed, it will first close two holes. For instance, in the transition from Figure 1 to Figure 2, holes P and A will be closed simultaneously, followed by holes B and S, and only then will holes A and R, as well as holes P and B, be connected. Secondly, in order to maintain the connection of holes P and B as shown in Figure 2 and the state of the valve core, it is necessary to supply power to the coil continuously.
*Precautions for Use
Once the movement stops, the P hole will be connected to the B hole, while the B hole and the S hole will be disconnected. Meanwhile, Hole A is connected to Hole R. In this way, the air pressure at end A will be consistent with the atmosphere, while the air pressure at end B will be consistent with the air inlet P. Through this kind of switching, we have achieved the complete reversing process of the valve. By continuously performing power-on and power-off operations, we can effectively control the actuators downstream of the valve, such as cylinders, etc. When designing equipment, engineers should make full use of these features, leverage their advantages, and try to avoid their shortcomings. To keep holes P and B connected, a continuous power supply is required. They will automatically resume after the power is cut off.
Above is a Detailed explanation of the Structure and Operation of the Two-position Five-way pilot-operated Pneumatic Solenoid Valve content To learn more related information, visit https://www.joosungauto.com/.
