Pneumatic valves compared to ordinary valves is actually the most important is more than a pneumatic piston actuator.
Pneumatic valve compared to ordinary valves is actually the most important thing is an additional pneumatic piston actuator. Its components are: adjusting bolt, actuator box, crank arm, cylinder body, cylinder shaft, piston, connecting rod, universal shaft. Different from human operation, it is using compressed air as a power source, through the movement of the piston to drive the crank arm for 90-degree rotation, to make the valve open and close automatically. Take pneumatic butterfly valve as an example, it is composed of actuator and regulator, the actuator here mainly plays a thrust role. According to the size of the control signal pressure to generate the corresponding thrust to promote the action of the regulator. The regulator is the valve body in direct contact with the media, pneumatic butterfly valves can be more energy-saving and precise regulation of fluid flow.
Pneumatic valves are divided into two categories according to the control mode of switching and regulating, a switch two control, a proportional regulation. Pneumatic switch-type valves contain pneumatic actuators, valves, solenoid valves, limit switches, pneumatic handling triplex, manual operating mechanism, mufflers, quick connectors, air compressors, air tubes and so on. Among them, limit switch, air handling triplet, manual operation mechanism, muffler, quick-connect joints can be freely selected according to the actual situation on site. Pneumatic regulating valves mainly include pneumatic actuators, valves, pneumatic and electric positioners, air source processing triplets, manual operation mechanism, muffler, quick-insertion joints, air compressors, air tubes, etc., where the manual operation mechanism, muffler, quick-insertion joints can be selected according to the actual situation on site.
The above is the composition of the pneumatic valve, then how to operate the pneumatic valve correctly? The specific way is as follows:
1, pneumatic valve in operation always in accordance with the clockwise opening and closing.
2, artificial opening and closing of pneumatic valves in the pipeline network should not be too many revolutions, large diameter valves in 200-600 turns can be.
3, the larger opening and closing torque in the pipeline under the condition of the public pressure is appropriate for 240N - m, which is to facilitate the opening and closing operation when there is only one person.
4, pneumatic valve opening and closing operation end should be square cone, and size standardisation, and facing the ground, so that people can operate directly from the ground. Valves with wheel discs are not suitable for underground pipe networks.
5, in order to ensure that the opening and closing is not excessive, the degree of opening and closing of the scale line, should be conspicuously cast in the gearbox cover or after the conversion of the direction of the display disc on the shell, always facing the ground. Once the opening and closing adjustment standard, should be locked with rivets.
6, if the pneumatic valve is buried deeper, to set up a solid and reliable extension pole facilities for personnel to observe the operation. Pneumatic valve in the pipeline network is also not suitable for downhole operation.