The invention relates to a switching valve, a switching hydraulic system and a crane. The switching valve is provided with an operating oil inlet port and an operating oil return port. The switching valve further comprises at least two groups of paired valve oil ports, paired cartridge valves are arranged between each group of paired valve ports and the operating oil inlet port as well as the operating oil return port, and the operating oil inlet port and the operating oil return port can switch between at least two groups of the paired valve oil ports by controlling opening and closing of the cartridge valves. The switching valve can connect and disconnect the operating oil inlet port and the operating oil return port with the paired valve oil ports by controlling opening and closing of the cartridge valves, switching between one hydraulic system pump and at least two closed systems is realized stably, the number of hydraulic system pumps is decreased, cost of the hydraulic system and integral truck load are greatly lowered, and the switching valve is high in reliability.
Switching valve, switching hydraulic system and crane
2015-05-20
Patent
Electronic Resource
English
Crane jib switching valve, hydraulic control system and engineering machinery
European Patent Office | 2015
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