The use of compressed air to promote the combination of multiple actuator pneumatic piston, transfer to the beams and features within the curve of the track, driven hollow shaft rotates, the compressed air input to the plate cylinder, change the location and out of gas in order to change the direction of spindle rotation, depending on the load (valve) of torque required to rotate the request, the number of adjustable cylinder combination to drive the load (valve) work.
Two position five way solenoid valve is usually double acting pneumatic actuator supporting the use of two is the two position control: On - off, the five is five channel ventilation, 1 of which are connected with an air supply, external air chamber two and the double acting cylinder of the air inlet and outlet connected with the internal two the gas chamber inlet and outlet connection, the working principle of double effect can refer to specific working principle of pneumatic valve actuator. As more and more control methods and means, in actual industrial production and industrial control, the method used to control pneumatic actuators is also a lot of, commonly used are the following.
Intelligent display instrument
Intelligent display instrument is used to monitor the working state of the valve and control valve actuator apparatus of the work, it is through the two-way valve position sensor to monitor the working state to determine the valve is in a valve open or closed valve state, recorded by programming valve switch, and there are two road and the valve opening corresponding to 4 ~ 20mA and output two normally open normally closed output contact. Through these output signals, control valve switching action.
Control system
PLC is more and more widely used in the control system. Because this scheme is developed on the PLC of OMRON, it is introduced by OMRON of PLC.
Hardware composition: 1 computers, 1 sets of PLC (including CPU, I/O module, ID212, OC224, AD003 module), 2 relays, 2 solenoid valves, 1 pneumatic valve actuators.
General requirements
1. The specifications and types of pneumatic valves manufactured shall comply with the requirements of piping design documents.
2, pneumatic valve model should be marked in accordance with the GB code requirements. If the enterprise standard, should indicate the relevant description of the model.
3, pneumatic pressure valve, requirements or pipeline working pressure, without affecting the price of the premise, the valve can withstand the working pressure should be greater than the actual pipe work pressure; any side pneumatic valve closing conditions should be able to withstand 1.1 times the value of the valve working pressure without leakage; valve opening conditions, the valve should be able to withstand two times the working pressure valve requirements.
4, pneumatic valve manufacturing standards, should be based on the national standard number, if the enterprise standards, procurement contracts should be accompanied by enterprise documents.