| 摘要 |
A pressure control assembly comprises a control valve set for controlling communication between an inlet and an outlet, a control spring acting in a sense to resist closure of the valve set and a device for varying the control force of the control spring acting on the valve set. The device for varying the control force may comprise a differential pressure responsive member which moves in response to a differential pressure to move an abutment engaging the spring between normal and actuated positions to compress or expand the spring and thus vary its force.
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