... type features:1, seal by structural ceramics, can prevent solid grain scour to seal face, wear, ensure valve seallasting effective.2, single ... the deposition of slag and jam.3, single seat, one-way sealing.4.the valve ... to seal face andvalve plate , short type structure design makes the body more compact structure ... 8. the valve seal adopt double seal structure type, soft seal + metal seal, metal sealing ...