An automatic pump in which a large volume of water flows through a valve that it periodically forces shut, the sudden pressure change being used to raise a smaller volume of water to a higher level.
- There is a device called a hydraulic ram, which causes water to flow uphill with no outside influences except the actual flow of water.
- Technicians used a customized hydraulic ram to stress the tendons to a predetermined gauge pressure corresponding to the design jacking force.
- Under this method the head of the crane is raised by means of a hydraulic ram so as to create a gap between the head of the crane and the mast.
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