Selective control device for plural kinds of oil-hydraulic actuators

A selective control device for plural kinds of oil-hydraulic actuators, comprising a directional control valve and an actuator selective valve, said actuator selective valve for selecting an operative oil-hydraulic actuator from among plural kinds of oil-hydraulic actuators adapted to be selectively connected to an oil-hydraulic pump through said directional control valve and said actuator selective valve arranged in series with said directional control valve so that the said operative oil-hydraulic actuator selected by the actuator selective valve is operable by said directional control valve, and a preselected one of the oil-hydraulic actuators including an oil-hydraulic cylinder, said actuator selective valve being provided with selective positions and a quick extensional position, said quick extensional position for quick extension operation of the oil-hydraulic cylinder of the preselected one of the oil hydraulic actuators, said selective positions corresponding to each of said plural kinds of oil-hydraulic actuators, said quick extensional position communicating an extensional pressure port of said actuator selective valve to a bottom side oil chamber of said oil-hydraulic cylinder and also communicating a head side oil chamber thereof to said bottom side oil chamber.