Motors: expansible chamber type – With motive fluid valve – Inlet fluid supplemented by controlled fluid pressurized in...
Patent
1990-06-20
1991-12-31
Michalsky, Gerald A.
Motors: expansible chamber type
With motive fluid valve
Inlet fluid supplemented by controlled fluid pressurized in...
91450, 91536, 13759615, 137885, F15B 1304, F16K 1306
Patent
active
050761447
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a poppet valve device in which a plurality of poppet valves are operated to switch by switching operations of a pilot valve, and especially to a poppet valve device in which a plurality of poppet valves are sequentially operated to switch by switching operations of a pilot valve actuated by, for instance, an electromagnetic solenoid or the like which operates in response to an external input signal.
BACKGROUND OF THE INVENTION
A poppet valve device, in which a pressure difference is produced between the front and the rear of a poppet in a poppet valve by switching operations of a pilot valve, and thus the poppet is moved to operate the poppet valve for switching, has been known.
With such a poppet valve device, although a plurality of poppet valves can be simultaneously operated to switch by means of a single pilot valve, it is impossible to sequentially operate a plurality of poppet valves for switching.
Consequently, in the case where a plurality of poppet valves are to be sequentially operated for switching, pilot valves are respectively provided in correspondence to the respective poppet valves and provision is made such that the timings for operating the respective pilot valves for switching are shifted to sequentially operate for switching, hence not only a number of pilot valves is increased and a cost becomes high, but also the plurality of pilot valves must be sequentially operated for switching, and the operations would become very troublesome.
SUMMARY OF THE INVENTION
The present invention has been worked out in view of the above-mentioned circumstance, and one object of the invention is to provide a poppet valve device in which provision is made such that a plurality of poppet valves can be sequentially operated for switching by switching operations of a single pilot valve.
Another object of the present invention is to provide a poppet valve device, in which two, first and second, poppet valves are provided, and among these, a pressure on the outlet side of the first poppet valve can be made to be a preset pressure.
In order to achieve the above-mentioned objects, according to a first aspect of the present invention, there is provided a poppet valve device comprising at least two, first and second, or more, that is, a plurality of poppet valves, each of which is constructed in such manner that a poppet for communicating or intercepting an inlet port and an outlet port formed on one side of a cylindrical body fitted within a valve bore may be moved towards a communicating position by a pressure on the inlet port side acting upon its pressure receiving portion, while it may be moved towards an intercepting position by a pressure acting upon its back pressure chamber, and a pilot valve which connects the back pressure chambers of the respective ones of the aforementioned plurality of poppet valves to a tank, and which includes a variable choke portion controlled by an external input signal so that the pressures in the respective back pressure chambers when the respective poppets in the aforementioned respective poppet valves are moved to the positions for communicating the respective inlet ports with the respective outlet ports may be made different from one another.
According to a second aspect of the present invention, there is provided a poppet valve device as described above in connection to the first aspect, wherein the poppet of the aforementioned first poppet valve is mounted so as to be freely slidable along a smaller diameter cylindrical body of an axial body fitted within the above-mentioned cylindrical body from the other side of the cylindrical body, and is biased towards the above-mentioned intercepting position by a resilient force of a compression spring interposed between the above-mentioned axial body and the poppet, and the inner diameters of the respective ones of the aforementioned outlet port and the above-described poppet are made identical.
According to a third aspect of the present invention, there is provided a
Ishizaki Naoki
Karakama Tadao
Nunotani Sadao
Takano Toshiro
Kabushiki Kaisha Komatsu Seisakusho
Michalsky Gerald A.
LandOfFree
Poppet valve device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Poppet valve device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Poppet valve device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1501235