at about one - fifth of the bursting pressure . A less proportion , such as one - eighth , should be adopted under less favourable conditions . Where hydraulic power is applied to movable machines , the continuity of the supply to meet the varying positions of the machines is insured by a ball and… … Fig . 8 . upon the ram , piston , or other working parts of a quick - acting hydraulic machine . This is accomplished by introducing relief valves . Fig . 9 shows their application to the slide valve of a crane . P , P represent the pressure , and E , E the ' exhaust pas - sages . It will be seen…
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