valve seat

... valve port 气门座 valve seat 气门座镶圈（嵌镶式气门座圈） valve seat insert(valve seat ring) 气门座锥角 ...

 valve-seat insert

... valve-seat grinding machine 气门座研磨机 valve-seat insert 气门座镶圈 valve-seat inserter 气门座镶装机 ...

 valve-seat ring

... valve-seat renewing tool 气门座修整刀具 valve-seat ring 气门座镶圈 valve-seat ring tool 气门座圈镶修工具 ...