Valve requirements

- Jun 18, 2019-

1. Valves should be stored in dry and ventilated rooms with blockage at both ends of the passage.


2. Valves stored for a long time should be inspected regularly to remove dirt and coated with rust-proof oil on the processing surface.


3. After installation, regular inspections shall be carried out. The main inspections are as follows:


(1) Wear condition of sealing surface.


(2) Trapezoidal thread wear of stem and stem nut.


(3) Whether the filler is out of date or not, and if it is damaged, it should be replaced in time.


(4) After the valve is repaired and assembled, the sealing performance test shall be carried out.


Valves in operation, all kinds of valves should be complete and intact. Bolts on flanges and brackets are indispensable. Threads should be intact and intact. No loosening is allowed. The fastening nuts on the handwheel should be tightened in time if loosening is found, so as not to wear the connection or lose the handwheel and nameplate. If the handwheel is lost, it is not allowed to be replaced by a live wrench. It should be matched in time. Packing glands are not allowed to skew or have no pre-tightening clearance. For valves in environments susceptible to rain, snow, dust, sand and other pollutants, the valve stem should be equipped with protective cover. The ruler on the valve should be complete, accurate and clear. The lead seal, cap and pneumatic accessories of the valve should be in good condition. Thermal insulation jacket should be free from depression and crack. It is not allowed to knock, stand or support heavy objects on valves in operation, especially non-metallic valves and cast iron valves.