... can prevent solid grain scour, wear to seal face,ensure valve seal lasting effective.2, single seat design can effectively prevent the comdeposition of ... valve is sealed with high quality ceramic, and has high mechanical strength.4, The valve has good wear resistance and ... 316/ Cr13% and so on4. Sealing face: soft seal such as Ceramic ,rubber,PTFE and Metal seal.5. Packing: PTFE, reinforce Graphite etc ...