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Plastic spraying--using corona discharge phenomenon to make the powder coating adsorb on the valves, so that the whole valves can obtain a certain thickness of the powder coating, and then the powder is melted, leveled and solidified by heat, that is, a hard coating film is formed on the surface of the valves.

paint spraying--Spray the paint directly onto the surface of the valves and then dry it naturally or at low temperature to make a film .