| 摘要 |
A fluid flow control valve has a bore within which a control member is slidable in response to variations in a servo pressure signal. The control member is also rotatable and includes a relieved portion which co-operates with a control orifice to regulate said servo pressure signal. It is arranged that in a number of discrete rotational positions of the control member the control orifice is shut off to prevent sliding movement, whereby flow through the valve can be set to predetermined levels by rotation of the control element to these positions. In one rotational position all flow is shut off, independent of the sliding position of the control element.
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