The efficient use of pneumatic valves is inseparable from the role of various accessories. At present, there are many pneumatic valve accessories on the market. Generally, there are the following categories: double-acting pneumatic actuators, spring return actuators, single solenoid valves, double solenoid valves Control solenoid valve, limit switch feedback device, electrical positioner, pneumatic positioner, electrical converter, air source treatment triplex and manual operation mechanism. Next, the editor will give you a brief introduction of the respective functions of these accessories.

1. Spring return actuator: when the circuit air circuit is cut off or fails, the valve will automatically open or close.
2. Double-acting pneumatic actuator: two-position control for valve opening and closing.
3. Single solenoid valve: the valve opens or closes when the power is supplied, and the valve closes or opens when the power is cut off.
4. Double solenoid valve: the valve opens when one coil is energized, and the valve closes when the other coil is energized, with memory function.
5. Limit switch feedback device: to transmit the signal of the switch position of the valve over a long distance.
6. Electric positioner: adjust and control the medium flow of the valve according to the magnitude of the current signal (standard 4-20mA).
7. Pneumatic positioner: adjust and control the medium flow of the valve according to the size of the air pressure signal (marked 0.02-0.1MPa).
8. Electrical converter: convert current signal into air pressure signal, and use it with pneumatic positioner.
9. Air source treatment triple unit: including air pressure reducing valve, filter, lubricator, to stabilize the air source, clean and lubricate the moving parts.
10. Manual operation mechanism: automatic control can be operated manually under abnormal conditions.

In addition to selecting the right accessories, the efficient application of pneumatic valves should also pay attention to the installation of the equipment. Installation is the first step in use, so we should pay attention to:

1. The installation of the pneumatic valve should be as concentric as possible with the valve and the pipeline flange, and fixed with support. The ball valve cannot be subjected to other external forces, so as not to damage the middle seal of the valve and the deformation of the valve, resulting in ineffective switching of the valve and damage to the valve so that it cannot be used.
2. The power air source provided by the pneumatic ball valve and pneumatic components must be clean and free from oil and water as much as possible. Cleanliness should be less than 0.4 microns.
3. Copper pipes or nylon pipes can be used for the connection of pneumatic actuators, solenoid valves, positioners, filters, pressure reducing valves, etc. In order to prevent dust and reduce noise, the exhaust port should be equipped with a muffler or a sound-absorbing throttling valve.
4. Before the pneumatic valve is installed and used, the pre-installation inspection and switch operation test must be carried out on the valve. It can only be installed and used under the condition of normal operation.
5. After installation, the pneumatic valve should be tested, pressurize the pneumatic actuator to the rated value, the pressure is 0.4 ~ 0.7mpa, carry out the switch test on the pneumatic ball valve, and observe the opening and closing of the valve. It should rotate flexibly without jamming. If there is jamming in the switch, the air pressure can be increased, and the valve can be adjusted to a flexible switch after repeated switching.

The above is the function of the various accessories of the pneumatic valve and the precautions during the installation of the pneumatic valve introduced by the editor. If you want to know more about the pneumatic valve, you are welcome to continue to learn about it on the website of China covna.