| 摘要 |
<p>A valve for the hydraulic braking of work machines or the like comprises an outer casing (2) provided with a longitudinal seat (3) and with at least one first port (P) for the connection of the seat (3) to a pumping assembly for feeding pressurized fluid, at least one second port (T) for connecting the seat to a fluid discharge and recovery tank, and at least one third port (M) for connecting the seat (3) to the braking system of a work machine or the like, a slider (4) which can slide along the seat (3) and is provided with a contoured portion (4a) which is suitable to allow/prevent the passage of the fluid through the connecting ports, and a reaction surface which is connected to the third connecting port (M), and means (8) for actuating the sliding of the slider (4) in the seat (3) in contrast with the pressurized fluid that affects the reaction surface. The actuation means comprise first elastic means (8), which are interposed between the casing (2) and the slider (4) and are adapted to contrast the thrust of the pressurized fluid against the reaction surface, second elastic means (9) which can be interposed substantially between a first abutment element (10) associated with the slider (4) and a second abutment element (11) arranged inside the casing (2), which are adapted to contrast the thrust of the first elastic means (8), and means (12) for manually actuating the loading/unloading of the second elastic means (9).
</p> |
