1) Sealing surface wear. The following are the same as the "
(2) stem and stem nut trapezoidal thread wear situation. The following are the same as the "
(3) whether the filler out of date failure, if damaged should be replaced. The following are the same as the "
(4) electric valve repair assembly, should be sealed performance test.
In the operation of the electric valve, all kinds of valve should be complete, intact. Flange and bracket bolts indispensable, the thread should be intact, not allowed to loose phenomenon. Handle on the fastening nut, if found loose should be tightened in time to avoid wear joints or lost hand wheel and nameplate. If the handwheel is lost, it is not permissible to use a live wrench instead. The packing gland does not allow skew or no preload gap. Electric valves that are susceptible to rain and snow, dust, sand and other dirt contaminated, the valve stem to install the protective cover. The scale on the electric valve should be kept complete, accurate and clear. Electric valve seals, caps, pneumatic accessories, etc. should be complete and intact. Insulation jacket should be no depression, cracks. Not allowed to run in the electric valve on the beat, station or support heavy objects; especially non-metallic electric valves and cast iron electric valves, but also to prohibit.