High-performance pneumatic pneumatic - valve repair the general procedure of what?

High-performance pneumatic pneumatic - valve repair the general procedure of what? A: high-performance pneumatic pneumatic - valve repair general procedure is: 1) Cleaning the external surface of the valve, the available compressed air or kerosene cleaning. 2) Check and write down the valve nameplate and other marks. 3) In order to remove the valve components. 4) Wash parts with kerosene. 5) Check the defects of parts. Hydrostatic test to check the body strength; Check valve seat and valve body and shut down and seal with the situation, and leak test; Check the valve stem and valve stem bushing thread wear; Inspection to shut down and the body sealing ring; Check the cover surface, deburring. Inspection of the flange joint face. 6) High-performance pneumatic pneumatic control valve repair. Surfacing weld defects and replace the sealing ring or seal face; The body and the new change of the sealing ring, and the joint of surfacing welding metal and the body, to leak test; Trim the flange joint surface; Ground sealing surface. 7) Repair to shut down. Weld defects or welding sealing ring; Car light or ground sealing surface. 8) Repair the packing room. Check and repair packing chamber; Trim gland and packing chamber at the bottom of the cone. 9) Replacement parts can't repair. 10) Reassemble the high-performance pneumatic pneumatic control valve. 11) Valve of the whole hydraulic pressure test. 12) The valve paint and marked according to the original record.