| 摘要 |
<p>The invention relates to a distributor for a fluid coming from a pressurised-fluid source, under a pressure that depends on the pressure of a control fluid. The distributor comprises, in a bore (3) formed in a body (1), a double valve means formed, on the one hand, by a first piston (21) of which one end defines, with a first plug (5), a control chamber (23) receiving the control fluid while the other end (27) is pierced by a channel (29) connected to a low-pressure fluid reservoir (11), while an annular chamber (31) surrounds the first piston (21) and is connected to the user circuit of the distributed fluid; and, on the other hand, by a disc (33) forming a valve head and resting on a circular seat (35), immobile with respect to the body (1), by virtue of a return spring (43). The disc (33) faces the first piston's other end (27) which is able to move up, under the action of the pressure in the control chamber (23), against the disc (33) in order to close off communication between the channel (29) and the annular chamber (31) and then to displace the disc (33) in order to open communication between a pressurised-fluid inlet channel and the annular chamber (31). …<??>According to the invention, the distributor comprises in addition a second piston (39), one of whose faces is joined to the face of the disc (33) opposed to the seat (35) of the latter, and the other of whose faces defines with a second plug (7), by which the bore (3) is closed, an equalising chamber (41) in permanent communication with the annular chamber (31). …<IMAGE>… </p> |
