A metering device for adjusting a flow rate of a flow of liquid comprises a flow-rate adjusting device including a rotatable adjusting member, and an actuating member for rotating the adjusting member. The actuating member is connectable with the adjusting member and may be disengaged therefrom in a...http://www.google.ca/patents/US4953594?utm_source=gb-gplus-sharePatent US4953594 - Flow control
