| 摘要 |
A valve for enabling the controls of a fluid-operated actuator, comprising a first body (2) that forms a longitudinal cavity (12) that has, at one end (2a), an inlet (13) for high-pressure fluid and at least one outlet (14) for discharging the fluid, a flow control element (22) that forms internally an axial cavity (26) and can move in the longitudinal cavity (12) between a position that opens the inlet (13) and a position that closes the inlet (13) and viceversa, a second body (3) that is connected hermetically to the other end of the first body (2) and has an extension (33) that is inserted hermetically in the axial cavity (26) and, on the opposite side with respect to the extension (33), a port (38) suitable to receive a pressurized actuation fluid for the actuation of a slider (44) that can move in a cylindrical seat (37) of the extension (33) between an inactive position and a stroke limit position, the flow control element (22) forming, with respect to the extension (33), a variable-volume pressurization chamber (48) and annular fluid transfer chambers (50,51,52) that are suitable to transfer the fluid that arrives from the inlet (13) toward the outlet (14), the pressurization chamber (48) and the transfer chambers (50,51,52) being detachably connected by the slider (44) in order to selectively move the flow control element (22) into the closure position, when the slider (44) is in the stroke limit position and the pressurization chamber (48) has the maximum volume, or into the open position, when the slider (44) is in the stroke start position and the pressurization chamber (48) has the minimum volume. <IMAGE> |
