Shanghai Brilliant tells you twenty valve installation precautions


One page book

 What should I pay attention to when installing valves? Let's explain the precautions for valve installation below.

1. When installing the valve, it is necessary to clean the inner cavity and sealing surface, whether the connecting bolts are evenly tightened, and check whether the packing is pressed.

2. The valve is closed during installation.

3. Large-specification gate valves and pneumatic control valves should be installed vertically, so as not to be biased to one side due to the large self-weight of the valve core, which will cause leakage.

4. There is a correct set of installation process standards.

5. The valve should be installed in accordance with the permitted working position, but attention must be paid to the convenience of maintenance and operation.

6. The installation of the globe valve should make the medium flow direction consistent with the arrow marked on the valve body, and the valve that is not often opened and closed but needs to be strictly guaranteed not leaking in the closed state can be installed in reverse to close it with the help of medium pressure.

7. When tightening the pressing screw, the valve should be in a slightly open state to avoid crushing the sealing surface of the top of the valve.

8. The cryogenic valve should be opened and closed in a cold state as much as possible before positioning, and it is required to be flexible and free of jamming.

9. The liquid valve should be configured with a 10° inclination angle between the stem and the horizontal to avoid the liquid flowing out along the stem, and more seriously, to avoid leakage.

10. After the large air separation tower is bare cold, the connecting valve flange is preloaded once in the cold state to prevent leakage at room temperature and at low temperature.

11. It is strictly forbidden to climb the valve stem as scaffolding during installation.

12. After all valves are in place, they should be opened and closed again, and the flexible and no jamming phenomenon is qualified.

13. The valve should generally be positioned before the pipeline is installed. The piping should be natural, and the position is not right, so as not to leave prestress.

14. Non-metallic valves, some are hard and brittle, some have low strength, and when operating, the opening and closing force cannot be too large, especially not violently. Also pay attention to avoid bumping objects.

15. When handling and installing valves, beware of bumps and scratches.

16. When the new valve is used, the packing should not be pressed too tightly, so as not to leak, so as to avoid too much pressure on the valve stem, accelerate wear, and open and close with difficulty.

17. Before the valve is installed, it is necessary to confirm that the valve meets the design requirements and relevant standards.

18. Before installing the valve, the inside of the pipeline should be cleaned to remove impurities such as iron filings and prevent foreign matter from being included in the valve sealing seat.

19. The high temperature valve is installed at room temperature, after use, the temperature rises, the bolt expands by heating, and the gap increases, so it must be tightened again, this problem needs to be paid attention to, otherwise it is easy to leak.

20. The installation of the valve should confirm whether the flow direction of the medium, the installation form and the position of the handwheel meet the regulations.

The above is the precautions when installing the valve, I hope to bring some help to friends in need