The invention relates to a rotary combined control valve, comprising a valve body, a reversing valve and an electric proportional overflow valve; a rotary motor is provided with a first oil port and a second oil port, the first oil port and the second oil port are respectively communicated with a first working port and a second working port of the reversing valve by a first oil path and a second oil path, and the first working port and the second working port of the reversing valve are communicated with an return oil path via the electric proportional overflow valve; an oil inlet of the reversing valve is communicated with a main oil path. The invention also provides a rotary system, a crane and a control method. The stationarity of the rotary system in a whole process can be improved, and a free slip rotating function is provided.


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    Title :

    Rotary combined control valve, rotary system, crane and control method


    Contributors:
    ZHANG PENG (author) / ZHANG FUYI (author) / ZHANG SHENGNAN (author) / ZHANG ZHEN (author)

    Publication date :

    2015-06-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B66C Krane , CRANES



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