| 摘要 |
The valve is fitted in the pressure pipe passing from a hydraulic pump operated by the tractor engine to a clutch of the power take-off shaft to avoid shock on clutch engagement. The valve is provided with an inlet opening (A), an outlet opening (B), which are in direct connection with each other, and a leakage opening (C), which communicates with the inlet and outlet openings (A and B) of the attenuation valve via a bleed valve (20) placed inside the body (10) of the attenuation valve (4). The bleed valve (20) automatically regulates the ratio of the flows passing through the outlet opening (B) of the attenuation valve (4) and through the leakage opening (C) as well as the pressure of the flow passing from the outlet opening (B) to the clutch (5), and thereby the engagement time of the power take off shaft (9). The valve also contains a choke channel (11) in which a floating piston (12) is located with clearance to provide throttled flow into an annular space (14) to act on a piston (16) influencing the opening of bleed valve (20). <IMAGE> |
