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1. Introduction
GB/T4213-92 is a Chinese Standard for pneumatic control valves, developed and published by Chinas Quality and Technology Supervision Bureau based on corresponding foreign standards. It includes four parts: general requirements, dimensions, special requirements and inspection rules. Through this standard, it provides technical specifications and other requirements for pneumatic control valves, which are widely used in low temperature, medium temperature and high temperature air, steam and hot fluid systems.
2. General Requirements
The GB/T4213-92 standard specifies general requirements for the pneumatic control valves, including materials, design, and the requirements for the surface finish, markings and packaging. It requires that the materials used in the valve should have sufficient strength, and it should be free from defects and any conductive material which causes corrosion. The welding technique should also meet with the requirements and should be securely attached and reinforced.
3. Dimensions
The GB/T4213-92 also specifies the dimension requirements for pneumatic control valves, including external dimensions, nominal diameters and internal diameters. According to this standard, the external diameter should be the same as the nominal diameter and the internal diameter should be larger than the nominal diameter. The size of the internal diameter of the valve should also depend on its pressure rating, operating temperature and other conditions.
4. Special Requirements
The GB/T4213-92 also specifies some special requirements for pneumatic control valves, such as the working temperature and pressure range, the type of actuator, the type of pneumatic valve, the number of connections, the type of connection and the connection shape. It also requires the testing conditions and the test conditions for material performance and air tightness, etc.
5. Inspection Rules
The GB/T4213-92 also specifies inspection rules for pneumatic control valves. These rules include visual inspection, pressure testing, water tightness test, air tightness test, operation test, material performance test, dimension test and so on. All these tests should be conducted according to this standard and the results should meet with the requirements.
Conclusion
GB/T4213-92 is the standard for pneumatic control valves developed and published by Chinas Quality and Technology Supervision Bureau based on corresponding foreign standards. It includes general requirements, dimensions, special requirements and inspection rules, which provide technical specifications and other requirements for pneumatic control valves. This standard is essential for the production, design and inspection of pneumatic control valves.
