... dirty on gate or seal surface 4.api ce,iso With GS,CE certificate Non-toxic,environmental-friendly material Customized design offered ... slag,dust and jam.3, single seat, one-way sealing with pressure.ZHONGCHENG'S special advantages:1, It can be used ... to block ash and deposition. 3, The valve is sealed with high quality ceramic, and has high mechanical strength.4, The ...