soft-sealing valve seat  软密封阀座

gas valve valve seat  气门-门座

Valve-valve seat  气门-气门座

expanding shut type hard sealing ball valves  撑拢式硬密封球阀

Hard Sealing  硬密封

hard seat  硬垫岩

hard valve  高真空电子管

soft-hard sealing  软硬密封

gland sealing valve  轴封供汽阀

Protective Sealing Valve  防护密闭门

triple eccentric seat sealing system  三偏心密封结构

Valve Sealing  阀门密封

valve sealing face  密封面

Valve Sealing Surface  密封面; 阀门密封面

Air valve seat  气门座

ball and seat valve  球形止回阀

ball resolver valve seat  球形分解器阀座

ball valve seat  球阀座

carbide tipped valve seat reamer  硬质合金气门座铰刀