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20 tips of valve installation

  • Author:Cowinns
  • Source:Cowinns
  • Release on :2020-03-04
20 tips of valve installation

    1. When installing the valve, you need to clean the inner cavity and sealing surface , whether the connecting bolts are evenly tightened , and check whether the packing is tight.

  2. The valve is closed during installation.

  3. Large-size gate valves,triple off set butterfly valve and pneumatic regulating valves should be installed vertically to avoid being biased to one side due to the heavy weight of the spool, which would cause leakage.

  4. Have a set of correct installation process standards.

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

  6. The stop valve should be installed in such a way that the flow direction of the medium is consistent with the arrow marked on the valve body. For valves that are not opened and closed frequently but need to be strictly guaranteed to not leak in the closed state, they can be reverse installed to tightly close them with the help of the medium pressure .

  7. When tightening the compression screw, the valve should be in a slightly open state, so as not to damage the sealing surface at the top of the valve.

  8. The low temperature valve should be opened and closed in cold state as much as possible before positioning. It is required to be flexible without jamming.

  9. The liquid valve should be configured with a 10 ° inclination angle between the valve stem and the level to prevent liquid from flowing down the valve stem, and more seriously, to prevent leakage.

  10. After the large-scale air separation tower is barely cold, pre-tighten the flange of the connecting valve once in the cold state to prevent leakage at normal temperature and leakage at low temperature.

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

  12. After all the valves are in place, they should be opened and closed again. It is qualified to be flexible without jamming.

  13 , the valve should generally be positioned before the pipeline installation. The piping should be natural, and the position should not be pulled hard to avoid leaving pre stress.

  14. Non-metallic valves, some are hard and brittle, and some have low strength. During operation, the opening and closing force cannot be too large, especially not to be vigorous. Also pay attention to avoid object collision.

  15. When handling and installing the valve, be careful of bumping and scratching accidents.

  16. When using the new valve, do not press the packing too tightly, so as not to leak, so as not to cause too much pressure on the valve stem, accelerate wear and tear, and open and close effort.

  17. Before the valve is installed, 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 to prevent foreign objects from being trapped in the valve sealing seat.

  19. The high temperature valve is installed at normal temperature. After use, the temperature rises, the bolts expand due to heat, and the gap increases. Therefore, it must be tightened again. This problem needs to be paid attention to, otherwise it is easy to leak.

  20. When installing the valve, such as metal to metal seat butterfly valve confirm whether the medium flow direction, installation form and hand wheel position meet the requirements.

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