| 摘要 |
A steering spindle operated valve arrangement is used to control flow to and from an accumulator pressure source to a servo motor, with an upstream valve means in series with a flow control piston valve to ensure against leakage during times of straight ahead steering when no pressure is required. This is of importance in any vehicle accumulator system to guard against insufficiency of pressure due to leakage, especially where accumulator pressure is used for functions other than steering boost, e.g., brakes, and accessories. The series valve means takes the form of one or more conical valves which are spring and pressure biased to closed position but mechanically opened by manual force upon steering spindle operation. The arrangement is such that the upstream valve means opens prior to opening of the piston valve for pressure feed to a servo motor.
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