Kayaba Kogyo Kabushiki Kaisha

Hikaru Murata

Yasuji Umeda

Yasusada Sakurai

Yasuo Doi

A pressure responsive sequence device wherein in order to carry out the pressure responsive sequencing operation in both the meter-in and meter-out flow control modes, between a supply line and a discharge line of a primary actuator is inserted a switching valve which automatically switches, in response to the pressure difference between the supply and discharge lines, to communicate either of them having a lower pressure than the other with a tank through a low pressure relief valve; and a sequencing valve is inserted in a supply line which communicates a pump in a hydraulic power source with a secondary actuator.

Pressure responsive sequencing device

A pressure-reducing device which incorporates, in a hydraulic actuating system provided with more than one circuit module, a flow rate control valve which is set at a lower flow rate value than the fluid supply rate from the hydraulic source and is installed in the supply side of a circuit module so as to control precisely the maximum working pressure of any of the said circuit modules thereby assuring that the maximum working pressure is at a value lower than the maximum pressure value set by a main relief valve installed in the fluid supply side leading from the hydraulic source. A relief valve is installed in the lower stream of the said flow rate control valve so as to control its maximum working pressure.

Pressure-reducing device

A fluid control valve, which relates to fluid control valves in which a pilot passage is opened or closed as a pilot flow is detected in the said pilot passage by means of a limit orifice mechanism located at the middle of the flow and a valve spool is switched by the differential pressure produced in the fluid passing the said limit orifice mechanism so as to effect a switch-over between unloaded and loaded states, and incorporates, as the said valve spool, a first valve spool effecting the switching action based on the differential pressure of the fluid passing the limit orifice mechanism and a second valve spool arranged in series with the first valve spool effecting a switching action being effected by the fluid pressure so that a load check function may also be provided.

Growing community of inventors

Gifu, Japan

Hikaru Murata