| 摘要 |
<p>Agricultural implement (1) with a fluid system to fold up a subframe (20), comprising - a conduit assembly, - a pump (110), - a reservoir (120), - an operable multiple position valve (130) with an inlet (P), an outlet (T) and a flow-through port (S), switching between: a pump position, a neutral position, and a discharge position; - an accumulator (170); - a cylinder (180); a valve assembly (140) comprising: - a non-return valve (150), and - a pressure valve (160) comprising a first port (I) to the flow-through port, a second port (II) to the accumulator and the second valve port, and a third port (III) to the cylinder; - a closing element (161), wherein, in a first closing position, the first port is closed and the third port is open to the second port, and, in a second closing position, the second port is closed and the third port is open to the first port. This provides a simple, resilient hydraulic lifting system for an agricultural implement.</p> |
