Fluid handling – Systems – Flow path with serial valves and/or closures
Patent
1991-07-16
1992-06-23
Schwadron, Martin P.
Fluid handling
Systems
Flow path with serial valves and/or closures
2511496, 251321, 251900, F16L 2900, F16K 3904
Patent
active
051234483
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a valve arrangement intended for pressure fluids, such as high-pressure oil, and being of the kind set forth in the preamble of the following claim 1.
Such valve arrangements are incorporated, inter alia, in quick-couplings of the kind which comprise a male part which can be pushed into a female part, so as to connect together two conduits or passageways. The valve arrangement may also be included in a hydraulic valve operative to open and close the connection between two conduits or passageways.
The valve arrangements include an elastic or resilient sealing ring which is fitted in a circular groove and which is subject to the effect of high-pressure fluid on one side thereof. The valve arrangement may also include a further sealing ring, which may be subject to the effect of high-pressure fluid, low-pressure fluid or atmospheric pressure on the other side thereof. By high-pressure fluid is normally meant high-pressure oil having a pressure of at least 10 bars and in those cases to which the invention pertains generally a pressure of at least some hundred bars.
When such a valve is opened, the high-pressure fluid will flow through the valve in an explosive, violent fashion for a short period of time and will strike the elastic sealing ring in such a manner that the ring would be torn from its groove unless precautionary measures are taken to prevent this from happening. These precautionary measures normally involve the incorporation of a solenoid valve in the conduit upstream of the valve arrangement, this solenoid valve being kept closed when the valve arrangement is adjusted from a closed to an open valve-setting and the sealing ring is moved through the risk zone. Only then is the solenoid valve opened, so as to allow the high-pressure oil, or other high-pressure fluid, to pass through the valve without damaging the sealing ring. The provision of the solenoid valve, or any other kind of closing valve, however, adds to the manufacturing costs and complicates manipulation of the valve arrangement. Furthermore, the presence of the additional closing valve considerably prolongs the time taken to open the valve arrangement.
Consequently, an object of the present invention is to provide a valve arrangement of the aforesaid kind which can be opened without the aid of additional closing valves.
The invention is intended primarily to improve quick-couplings intended for connecting a pressure-oil source having a pressure of several hundred bars to a hydraulic tool, and then particularly to quick-couplings of the kind in which a number of male coupling-parts are attached to a carrier plate which can be moved hydraulically, backwards and forwards in relation to stationarily mounted female coupling-parts intended to receive respective male parts upon forward coupling-movement of the carrier plate. In these instances it is unnecessary to provide the female coupling-parts with locking sleeves which coacts with balls such as to lock the male part to the female part when coupling the two parts manually together at a relatively low pressure in a conventional manner. However, the invention is also intended for application in quick-couplings where the fluid pressure is sufficiently low to enable the male and female parts to be coupled manually, such as in the case of various types of hydraulic tools which operate at a hydraulic pressure of about 10 bars or less.
The improved, inventive valve arrangement of the aforesaid kind has the characteristic features set forth in the characterizing clause of the following claim 1.
Thus, the elastic sealing ring is protected by an axially displaceable valve sleeve which holds the throughflow passageway closed until the sealing ring has been moved to a safe position, whereafter displacement of the valve sleeve opens the throughflow passageway.
These and other details and advantages significant of the invention are described below in more detail with reference to a number of exemplifying embodiments of an inventive valve arrangement illustrated in the ac
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Jonsson Ake
Kjellberg Kenneth
Lee Kevin L.
Nyberg Bo Erik
Schwadron Martin P.
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