1. Inside and outside the pneumatic gate valve (including the variable speed transmission box), first of all, shot blasting, sand removal and rust removal, and strive to electrostatically spray powder non-toxic epoxy resin with a thickness of more than 0.3mm. When it is difficult to electrostatically spray non-toxic epoxy resin for extra-large valves, similar non-toxic epoxy paint should also be brushed and sprayed.

2. The interior of the valve body and all parts of the valve plate require comprehensive anti-corrosion. On the one hand, it will not corrode when immersed in water, and there will be no electrochemical corrosion between the two metals; on the other hand, the surface is smooth to reduce the water resistance.

3. The hygienic requirements of the anti-corrosion epoxy resin or paint in the valve body of the pneumatic gate valve should have the test report of the corresponding authority. The chemical and physical properties should also meet the relevant requirements.