您要查找的是不是：
- AIR VALVE IS MADE UP OF UPPER VALVE SEAT, LOWER VALVE SEAT, 5 KINDS OF ACCURATE VALVE SLICE AND 25 SPRINGS. 该气阀是由上阀座、下阀座及大小5种精密阀片和25个弹簧等零件组成。
- upper valve seat 上端阀座
- Clean or replace the relief valve seat. 清洗或更换安全阀阀座。
- Damage or fouled relief valve seat. 安全阀阀座损坏或受到污染。
- Damaged or fouled relief valve seat. 安全阀阀座受到损坏或污染。
- When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat. 当手轮旋转到关闭位置，上阀杆推动横膈膜，横膈膜下垂，迫使下阀杆接触阀座。
- Place the relief valve seat back into the chamber bore. 将安全阀阀座放回到镗孔内。
- Slide the diaphragm assembly into the relief valve seat. 将隔膜总成滑进到安全阀阀座内。
- Remove the upper valving of X-tree above the spool. 抬开大四通以上采油树闸门部分。
- Remove the pressed in relief valve seat and seat O-ring. 拆卸压进去的安全阀阀座和阀座O形环。
- The maximum differential pressure across the valve seat. 通过阀门阀座的最大压差。
- Quick replaceable valve seat, convenient maintenance. 阀座可以快换，维修方便。
- Stellite takes a high polish and is used in steel valve seat rings. 钨铬钴合金具有很高的抛光度，用作钢阀门的阀座环。
- The upper stem is threaded into the diaphragm retainer nut. When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat. 上阀杆通过丝口旋在横膈膜止动螺母里。当手轮旋转到关闭位置，上阀杆推动横膈膜，横膈膜下垂，迫使下阀杆接触阀座。
- The exhaust valve seats skimmed up. 排气阀座整新。
- All valve seats and seat discs shall be replaceable. 所有阀门阀座和阀座阀瓣应该是可更换的。
- These valves eliminate the need of elastomeric packing by sealing the upper valve with a series of metal diaphragms. 它们通过使用一系列的金属横膈膜来密封阀门上部，不需要人造橡胶衬垫。
- Electrolysis of relief valve seat or first check seats. 安全阀阀座或第一止回阀阀座被电解或电蚀。
- Electrolysis or relief valve seat or first check seats. 安全阀阀座或第一止回阀阀座产生电蚀。
- If the cage disengages prematurely, simply use the cage as a tool to screw the check valve seat from the valve body. 如果预先拆卸阀笼，就可以将阀笼作为工具从阀体上旋转止回阀阀座。
