Proportional control type remote-control direction switching control valve device
AssigneeDiesel Kiki Co., Ltd.
InventorYuji Satoh
Life of this patent
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Abstract
A remotely operated, direction switching proportional control device comprises a direction switching control valve which includes a hydraulic actuator, an electromagnetic pressure reducing valve interposed between a liquid chamber of the hydraulic actuator and a hydraulic power source and an electromagnetic open or closed valve interposed between the liquid chamber and a liquid tank. Both the pressure-reducing valve and the open or closed valve can be operated against an electromagnetic force for return movement. The device eliminates the requirement for a piston stroke detector and may be operated by a single electromagnetic coil.
Claims1
A proportional control type remote-control direction switching control valve device comprising:
- a first valve disposed between a liquid feed passage and an output passage to be opened and closed;
- a second valve disposed between said output passage and a liquid returning passage to be opened and closed;
- a first spring in abutment with said first valve to urge said valve toward a closed position;
- a second spring interposed between said first valve and said second valve, said second spring having a biasing force greater than that of said first spring;
- and
- an electromagnetic means in abutment with said second valve and energizable to move said second valve in a closing direction and to move said first valve in an opening direction, and wherein said first and second valves and said first and second springs are disposed in a linear array and said first valve is subjected to the pressure of said output passage so as to be moved thereby in a closing direction.
Dependencies are inferred from the claim text.