| 摘要 |
<p>A hydraulically operated consumer appliance (3) is supplied with hydraulic fluid from a pump (2), and the flow to the appliance is controlled by the valve (1). The latter has a spring-loaded piston (8), with one side enclosing a chamber (5) in the valve body. The chamber is connected at one side to the pump through a non-return valve (26). The other side of the piston encloses a chamber (6) connected to the return flow tank (14). If the pump delivery flow rate exceeds the rate of consumption by the appliance, the pressure in the first chamber rises and moves the piston which, in turn, moves a sliding sleeve (12) so that a chamber (7), which is permanently connected to the pump, is then connected to the return flow tank.</p> |
