密封座 meaning in Chinese

seal holder
seal receptacle

Road vehicles - sheat - type glow - plugs with seating and their cylinder head housing - part 1 : m14 1 , 25 glow - plugs iso 6550 - 1 : 1994
道路车辆.锥形密封座火花塞及汽缸盖孔.第1部分: m14
Road vehicles - sheath - type glow - plugs with conical seating and their cylinder head housing - part 2 : m12 1 , 25 glow - plugs iso 6550 - 2 : 1994
道路车辆.带圆锥形密封座和汽缸盖孔的火花塞.第2部分
Easy on / off : sphere disengaging from seal seat on opening and closing without any contact but small torque and flexible rotation
开关轻便：启、闭时，球面与密封座脱离，无任何接触，扭矩小，转动灵活。