| 摘要 |
An overload relief valve for use in preventing damage to the hydraulic system for adjustably positioning a working element, such as a blade. A single relief valve permits relief of high fluid pressure developed in either of the control cylinders by providing a crossover function therebetween under such conditions, as well as to relieve the fluid to tank in the event of a high pressure condition existing in both cylinders concurrently. The crossover relief may be effected by a similar first preselected high pressure condition in either of the cylinders.
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