ZH Series Pneumatic Actuator Market
Technical standards for pneumatic actuators
Products in each industry have their own standards, and products that meet various requirements can be applied to various industries. Among them, the products in the valve industry strictly comply with their standards. Only when they meet all aspects of the standards, can they ensure that there will be no failures in operation. Today we will focus on the pneumatic actuator products in the industry. The function of the pneumatic actuator is to adjust the valve actuator through air pressure opening and closing. In the actual operation process, it is necessary to fully understand the technical standards of each link. Here's a brief introduction
1、 Standards to be met structurally
1. The pneumatic device is mainly made of air cylinder. The piston, gear shaft, end cover, seal and screw sleeve pneumatic device shall also include opening indication, travel limit, solenoid valve, positioner, pneumatic element and manual mechanism. It is composed of signal feedback and other components.
2. The connection size of pneumatic device and valve shall meet the requirements of ISO5211 (bottom), GB/T12222 and GB/T12223.
3. When the air supply is interrupted, the pneumatic device with manual mechanism shall be able to use its manual mechanism to open and close the valve. When facing the handwheel, the handwheel or handle shall be rotated counterclockwise until the valve is opened, and clockwise until the valve is closed.
4. When the end of the piston rod is an internal and external thread, there should be a wrench opening suitable for the standard wrench.
5. The sealing ring of the piston shall be easy to replace and repair.
6. For pneumatic device with buffer mechanism, the stroke length of buffer mechanism can refer to Table 1.
7. The pneumatic device with adjustable buffer mechanism shall have a mechanism to adjust the buffer effect outside the cylinder.
8. The thread size of cylinder inlet and outlet shall meet the requirements of MANURNORM (accessory standard) GB/T7306.1. GB/T7306.2 and GB/T7307.
Pneumatic straight stroke actuator
2、 Standards to be met in performance
1. The rated output force or torque of the pneumatic device shall meet the requirements of GB/T12222 and GB/T12223
2. In case of no load, input the air pressure in the cylinder as specified in Table 2, and the action is stable without blockage and creeping.
3. The pneumatic device starts under the air pressure of 0.6MPa The output torque or thrust in both directions shall be closed, and its value shall not be less than the value marked on the sign of the pneumatic device. The action shall be flexible without deformation and other abnormal phenomena.
4. When the sealing test is conducted under the working pressure, the amount of air leaking from each back pressure side shall not exceed (3)+0.15D) cm3/min (standard state). The amount of air leaking from the output shaft shall not exceed (3)+0.15d) cm3/min.
5. The strength test shall be conducted with 1.5 times of the large working pressure. After maintaining the test pressure for 3min, the cylinder end cover and static sealing parts shall be free of leakage and structural deformation.
6. Action life time, pneumatic device simulates valve action. When maintaining the output torque or thrust capacity in both directions, the number of opening and closing operations shall not be less than 50000 times (the opening and closing cycle is once).
7. When the piston moves to the end of the stroke, the pneumatic device with buffer mechanism is not allowed to impact.
3、 Appearance standard
1. Cast cylinder end cover, end flange and box shall be free of scratches, cuts, air holes and burrs.
2. The coating or chemical treatment layer on the external surface of the pneumatic device shall be flat, smooth, uniform in color, and free of oil stain, indentation and other mechanical damage.
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