When assembling, leave the mark on body of piston rod frontward.
装配时, 杆身上的记号要朝前。
Pull the piston assembly free of the body by grasping the sleeve and pulling down.
抓住套筒往下拉，将活塞总成从阀体内拉出。
Sealing tightness is ensured by the compression of the sealing rings against the piston and valve body.
受压的密封环紧紧贴住旋塞和阀体，确保密封的严密。
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