... ,such as heavy medium piping system for coal preparation plantPneumatic ceramic knife gate valve features:1, seal by structural ceramics, ... and deposition. 3, The valve is sealed with high quality ceramic, and has high mechanical strength.4, The valve has good wear resistance ... Cr13% and so on4. Sealing face: soft seal such as Ceramic ,rubber,PTFE and Metal seal.5. Packing: PTFE, reinforce Graphite ...