| 摘要 |
The invention is directed to a valve actuating device (20) comprising a body (22) with a bore (221) and a bottom (222), an actuating element (24) sealingly housed in the bore (221) of the body (22) and forming a first chamber (25) with the body (22), a piston (26) sealingly extending through a bore (241) in the actuating element (24), said piston (26) and bore (241) delimiting a second actuating chamber (27), a passage for an auxiliary fluid between the first and second chambers (25, 27) so that a movement of the piston (26) in the bore (241) of the actuating member (24) can increase the pressure in the first chamber (25) and move the actuating element (24). The fluid passage comprises a restriction (28) and a check-valve (30), both arranged in parallel, so as to limit the flow of the auxiliary fluid from the second chamber (27) to the first chamber (25). |
