How does the pneumatic valve work and its installation and use?

1. The working principle of pneumatic valve
Pneumatic valve is a pneumatic control valve that uses compressed air into the pneumatic actuator to drive the piston to move, and the rotating or lifting torsion shaft drives the valve stem to drive a pneumatic control valve.

Pneumatic valves are divided into three types: single-acting, double-acting, and intelligent adjustment. The single-acting pneumatic actuator is driven by a spring to push the piston structure. There are two principles of open and normally closed. It is either air-open or air-close. When no air enters A spring pushes the piston to close the valve. This principle is normally closed. The valve is closed when the gas enters the cylinder, and the valve is opened by the spring with piston when the gas is cut off. The structure is open.

Attention should be paid to avoid long-term compression of the spring and lose its effect when purchasing. Double-acting is the principle of air-opening and air-closing. The double-acting pneumatic valve needs to be equipped with a two-position five-way solenoid valve. When the gas from the air hole A enters the cylinder, the piston rotates and the torque valve is closed. , The piston drives the torque valve to open.

2. The installation and use of the valve
(1) Before the pneumatic valve is installed and used, the valve must be checked before installation and switch operation test. It can be installed and used only under normal operating conditions.
(2) The installation of the pneumatic valve should make the valve and the pipeline flange as concentric as possible, and fix it with support. Do not subject the ball valve to other external forces to avoid damage to the valve's middle seal and valve deformation. The valve cannot be used due to the failure of the valve switch and the damage of the valve.
(3) It is necessary to ensure that the power source provided by the balloon valve and pneumatic components must be clean and free of oil and water as much as possible. The cleanliness should be less than 0.4 microns.
(4) Before connecting to the air source, the air supply pipeline, air source interface, switch and other devices must be cleaned to prevent malfunctions caused by dirty and sand rushing into the pneumatic actuator due to unclean pipelines.
(5) For the connection of pneumatic actuators, solenoid valves, positioners, filters, pressure reducing valves, etc., copper pipes or nylon pipes can be used. In order to prevent dust and reduce noise, the exhaust port should be equipped with a muffler or muffler joint Flow valve.
(6) After installation, the pneumatic valve should be tested, pressurize the pneumatic actuator to the rated value, the pressure is 0.4 ~ 0.7mpa, open and close the pneumatic ball valve, observe the opening and closing of the valve. It should be rotated flexibly without jamming. If the switch is blocked, the air pressure can be increased, and the valve can be adjusted to be flexible by repeatedly switching on and off.
(7) When installing and debugging the on-off pneumatic valve, first use the manual device to debug (manual button on the solenoid valve), and then energize the debugging after the operation is normal.
(8) Pneumatic valves should be regularly maintained at the rotating part of the valve stem, and oil (oil) should be added once every three months. Regularly drain and drain the pneumatic actuator and the air filter used in conjunction with it. Under normal circumstances, check once every six months, and check and repair once a year.
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