Rotary control valve unit, rotary control hydraulic system and crane
A hydraulic system and control valve technology, applied in the hydraulic field, can solve the problems of unstable load flow, unstable crane rotation and fretting, and unstable valve port pressure difference.
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[0035] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Various preferred embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0036] In this document, unless otherwise specified, the orientation words such as left, right, upper, lower, and middle are determined based on the corresponding drawings. The following describes the embodiments provided by the present invention by taking a hydraulic system applied to a crane as an example.
[0037] Please refer to figure 1 , which is a schematic diagram of the principle of the rotary control valve group provided in Embodiment 1 of the present invention. The rotary control valve group includes a proportional reversing valve 2 , a shuttle valve 5 and a differential relief valve 7 . in:
[0038] The proportional reversing valve 2 can be an existing reversin...
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