Valve appearance inspection

1. Whether there are sand holes, cracks and other defects on the inner and outer surfaces of the valve body.

2. Whether the tight connection between the high-pressure gate valve and the valve body is firm, whether the valve core matches the high-pressure gate valve, and whether the protruding surface is defective.

3. Whether the connection between the valve seat and the valve core is flexible and reliable, whether the valve seat is bent, whether the external thread is damaged or corroded.

4. Whether the filling material and sealing ring are aging and damaged, whether the valve is easy to open, etc.

5. There should be a factory nameplate on the valve body, and the valve body and nameplate should include: manufacturer's name, valve name, pound class, nominal diameter, pipe diameter and other signs.

6. The opening and closing parts of the valve should meet the following requirements:

(a) Valves such as globe valves, globe valves, one-way throttle valves, butterfly valves, water pump bottom valves, and regulating valves should be in the fully closed position.

(b) The plug valve and the valve shut-off should be in the fully open position.

(c) The pneumatic butterfly valve should be in the closed position. Do not close it too tightly to avoid damaging the pneumatic butterfly valve.

(d) The piston valve of the check valve shall be closed and fixed.

7. The spring-type safety valve should have a lead seal, and the lever-type valve should have a hammer-type positioning device.

8. The piston valve or valve core posture of the check valve should be flexible and accurate, without axial force, offset or tilt.

9. The inner surface of rubber-lined pipes, pond-lined porcelain and plastic-lined valves should be flat and smooth.

10. The protruding surface of the flange should meet the regulations and there should be no tangential scratches.

11. The valve must not be damaged, missing parts, eroded, or the factory nameplate has fallen off, and the valve body must not be stained.

12. There should be safety protection covers on both sides of the valve, the rocker or manual operation should be flexible, and there should be no jamming.

13. The valve quality certification documents should include the following:

(a) Manufacturer's name and date of manufacture.

(b) Product name, model specification and specification model.

(c) Class, nominal diameter pipe diameter, usable substance and usable temperature.

(d) According to the specification, inspection results and inspection date.

(e) The factory identification code, the inspection staff and the person responsible for the inspection are stamped.