Three-way valves are widely used in the chemical, plastic, and foundry industries. In the past, most of them were manually operated. With the development of science and technology, automatic control technology has been widely used in various production fields. It was under this circumstance that the air-controlled three-way valve was born. The pneumatic three-way valve can realize automatic control during the production process through electric-pneumatic control technology.
Pneumatic three-way valve structure diagram (1. Cylinder block 2. Piston 3. Piston rod 4. Cylinder head 5. Roller assembly 6. Spiral guide sleeve 7. Protective cover 8. Valve stem 9. Adjustment wire sleeve 10. Spiral sleeve Shell 11. Valve body 12. Valve port 13. Valve core)
The working principle of the air-controlled three-way valve is as follows:
The pneumatic three-way valve consists of upper, middle and lower parts. The upper part is a double-acting cylinder, the middle part is a rotating component, and the lower part is a three-way ball valve. When piston 2 is at the upper end of the cylinder, chamber I and chamber II are connected. When the air source enters the cylinder from P1, piston 2 in the cylinder moves downward under the action of air pressure, and piston rod 3 drives roller 5 to be guided along the spiral guide sleeve shell. The downward movement of the groove causes the spiral guide sleeve 6 to rotate. When the piston 2 moves downward to the lower end of the cylinder, the spiral guide sleeve rotates 90°. The spiral guide sleeve drives the ball valve stem 8 to rotate 90° and the valve core 13 to rotate 90°. In this way, I The cavity is isolated from the II cavity, and the I cavity is connected to the III cavity. On the contrary, when the air source enters the cylinder from P2, the piston 2 in the cylinder moves upward under the action of air pressure. The piston rod 3 drives the roller 5 to move upward, causing the spiral guide sleeve 6 to rotate. When the piston 2 moves upward to the upper end of the cylinder, the spiral The guide sleeve rotates 90° in the opposite direction, the spiral guide sleeve drives the ball valve stem 8 to rotate 90° in the opposite direction, and the valve core 13 to rotate 90° in the opposite direction, so that the I chamber is isolated from the III chamber, and the I chamber is connected to the II chamber.
The pneumatic three-way valve can be controlled by controlling the air inlet and outlet directions of ports P1 and P2 through the pneumatic electromagnetic reversing valve. The media that can pass through the pneumatic three-way valve are fluid, gas-liquid mixture and semi-fluid.