Month: March 2023

1.The pipelines before and after the valve are ready, the pipelines should be coaxial, and the sealing surfaces of the two flanges of the flange connection valve should be parallel. The threaded connection valve thread should be intact. The thread standard should match the valve. The pipeline should be able to bear the weight of the valve, especially when the valve is installed lying flat, proper support should be made to the valve to prevent damage to the valve parts.

2.Purge the pipes before and after the valve to remove oil stains, welding slag and other debris in the pipes.

3.Check the mark of the valve to find out that the valve is intact. Fully open and close the valve several times to confirm that it is working properly

4.Remove the protective parts on the connecting ports at both ends of the valve.

5.Check whether there is any foreign matter in the flow passage in the valve. Even if there are only small foreign matter between the valve plate and the sealing surface, it may damage the sealing surface of the valve seat.

1 It is necessary to verify that the upstream and downstream pipelines of the valve have been relieved of pressure before disassembling.

2 Care must be taken to prevent damage to the sealing surface of parts, especially non-metal parts, when disassembling and reassembling.

3 The bolts on the flange must be tightened symmetrically, gradually and evenly during assembly.

4 Metal chips, fibers, grease (except those specified for use), dust, other impurities, foreign objects, etc., should not be allowed to contaminate, adhere or stay on the surface of the parts or enter the cavity during assembly.

1 The valve is forbidden to be transported by hanging on the handwheel with a hook

2 Before the valve is used, both ends of the flow channel must be plugged with valve sleeves to prevent dust impurities from entering, and there must be plug sleeves to protect the sealing surface. Keep the valve dry and ventilated. When the valve is not used for a long time, the inner cavity of the valve should be cleaned. Clean, additionally coated with anti-rust oil to prevent rust.

3 Before the valve is installed, it is necessary to check whether there is any impurities in the valve cavity, and check whether the valve is open or closed.

4 The valve must be installed in the pipeline in a horizontal state, and must not be suspended, inclined, etc., and a bracket must be provided in the suspended position.

5 Each time the valve is opened and closed, the valve position indicator must be in the same position as described above.

6 When the valve needs maintenance in the pipeline, the valve should be in a half-open and half-closed state, and then withdraw for maintenance

7 During the use of the valve, check the tightness of the bolts and nuts, and stop when necessary.