| 摘要 |
<p>A steering circuit includes a fluid pump having an inlet in communication with a reservoir and an outlet. An actuator is in selective communication with the fluid pump. A steering unit defines a fluid inlet port in fluid communication with the fluid pump a fluid outlet port in fluid communication with the fluid pump and first and second control ports in fluid communication with the actuator. The steering unit includes a valve assembly having an open center neutral position that provides fluid communication between the fluid inlet port and the fluid outlet port and a fluid meter. A pressure relieving valve provides fluid communication between the outlet of the fluid pump and the reservoir when fluid pressure exceeds a threshold value. A bypass valve provides selective fluid communication between the outlet of the fluid pump and the reservoir. The bypass valve is disposed in parallel to the pressure relieving valve.</p> |
