| 摘要 |
<p>A spring biased check valve (116) is positioned within the piston rod (52, 54) and is operatively connected with one of the passageways (134, 126, 130). The check valve (116) has a valve member displaceable from a valve seat (120) by hydraulic pressure to overcome the spring bias (122, 124) and allow flow in one direction. The centre tube (102) is axially displaceable relative to the piston rod (52). Displacement is effected by end of stroke movement of the cylinder body (38) and displacement of the centre tube (102) causes displacement of the valve member (116) to mechanically open the check valve.</p> |
