It is the monopolization products of our company. In coal chemical industry, shutter for transporting coal gas is frequently hard to open or is sealed up untightly. Basing on loose characteristic of coal gas and assimilate foreign advanced experience, we improve tranditional gate valve. The new product adopt double-decker.  Before opening the gate valve, jacket heats (about 140°c) and melt 

Tar NaiZha polymer on the undersurface , which makes it easy to open the gate valve.