The industry commonly known as the pneumatic head of pneumatic device is actually another call, gas pressure is driving opening and closing of the valve or adjusting device

structure

1, pneumatic device must be by cylinder, opening indicator, travel limit, pneumatic components, manual institutions, signal feedback and etc. Parts

2, pneumatic device and connection of valve size should comply with the GB/T12222 and GB/T12223 rules

3, with manual institutions of pneumatic device, in the air when interrupt, should use its manual institutions for the opening and closing of the valve operation, face the handwheel, the handwheel or handle counterclockwise for valve should be open, clockwise for valve shut

4, piston rod ends for internal and external threads, should have standard wrench suitable wrench mouth

5, piston sealing ring should be convenient to replace and maintenance

6, with the buffering mechanism of pneumatic device, the buffering mechanism trip length can consult table l rules

7, with adjustable buffering mechanism of pneumatic device, should adjust its cushioning cylinder external institution

8, cylinder engines in and out of the thread sizes should comply with the GB/T7306.1, GB/T7306.2 and GB/T7307 rules

performance

1, pneumatic device rated output force or torque should comply with the GB/T12222 and GB/T12223 rules

2, no-load cases in, in the air to enter the pressure of the provisions on table 2, the movements should be smoothly, no card resistance and creep phenomenon

3 in 0.6 MPa, the air pressure, the pneumatic device and closed two directions, the output torque or thrust, the value that should be no less than the sign of pneumatic device indicated by numerical, and action should be flexible and not allowed in each part of the permanent deformation and other abnormal phenomenon

4, seal to experiment with the maximum working pressure test, from their own back pressure side leak out of the air quantity does not allow more than (3 + 0.15 D) cm3 / min (standard state); From the output shaft cover, in the amount of air leak out of not allowing more than (3 + 0.15 d) cm3 / min

5, strength test use 1.5 the maximum working pressure test, keeping the test pressure 3 min, the cylinder cover and static sealing parts are not allowed to have leakage and structural deformation

6, action life times, pneumatic device simulation valve actuation, keep in two directions of the output torque or thrust of their ability, open the opening and closing of operation shall be no less than 50000 times the number (rev.-for a closed cycle)

7, take the buffering mechanism of pneumatic device, when the piston moves to travel terminal location, not be allowed shock

Surface quality and appearance

1, casting of the cylinder cover, the end flange, the case may not have Nick, cut on, porosity, burr, etc

2, pneumatic device outside surface paint layer or chemical processing layer should level off, smooth, the color and luster is even, no pollution, indentation and other mechanical damage