Fluid handling – Systems – Flow path with serial valves and/or closures
Patent
1998-11-23
2000-07-04
Ferensic, Denise L.
Fluid handling
Systems
Flow path with serial valves and/or closures
13761404, F16L 3728
Patent
active
060823992
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a quick coupling for hoses or pipes for pressure media especially for hydraulic media under high pressure.
Quick couplings of this type are previously known in a number of different constructions. These couplings are intended for use in hydraulic systems for example and they are so called no-spillage couplings, i.e. both parts of the coupling are tight even in decoupled state and there is no leakage of pressure medium to the surroundings when the coupling is decoupled.
If a coupling of this type is used in a hydraulic system under high pressure, there can be damage to the coupling when the parts are coupled together under pressure. This is due to the fact that if one coupling part is under pressure and the other is pressureless, there will be, when coupled together, a heavy pressure impact when the pressure medium flows into the pressureless coupling part. This will involve a great risk that the pressure medium will cause damage to sealing rings or the like or even tear out the sealing rings. Thus, they will not be able to perform their function when the coupling is decoupled and torn off parts of sealing rings or entire sealing rings may be carried further into the hydraulic system and cause damage to other locations therein. When there is a sudden drop in pressure on one side of a coupled coupling, there is also a flow suroe which can give rise to corresponding damage.
The invention is intended to achieve a quick coupling of the type described by way of introduction which removes the risks described above and provides secure decoupling and coupling together even under high pressure with no risk that the sealing rings or other sealings means will be damaged or torn out by the pressure medium. This is achieved according to the invention by providing the quick coupling with those features which are disclosed in the characterizing clause of claim 1.
Advantageous embodiments of the invention are disclosed in the subclaims.
The invention will be described in more detail below with reference to the accompanying drawing in which:
FIG. 1 shows a longitudinal section through a quick coupling according to one embodiment of the invention in its decoupled state;
FIGS. 2 and 3 show longitudinal sections through the quick coupling according to FIG. 1 in two different states during a coupling sequence; and
FIG. 4 shows a longitudinal section through the quick coupling according to FIG. 1 in its coupled state.
The quick coupling shown in the drawing according to the invention consists of two main parts, namely a female part 1 and a nipple 2. The female part 1 is essentially cylindrical and is provided with connector means for connecting a hose, a pipe or the like (not shown). The female part 1 has a valve element which is axially displaceable between a closed position, which is shown in FIG. 1, and an open position, which is shown in FIG. 4. In the closed position shown in FIG. 1, the valve element 4 seals against the female part 1 with the aid of a sealing ring 5, which is disposed in a groove in the wall of a channel 6 in the female part 1.
The valve element 4 is provided with an extension 7 which extends towards the end of the female part 1 facing away from the connection means 3. At its free end, the extension 7 is provided with an enlarged end piece 8, the outer diameter of which is equal to the outer diameter of the portion of the valve element cooperating with the sealing ring 5. The diameter of the extension 7 is appreciably smaller. A tube 9 is disposed around the extension 7, and this tube has the same outer diameter as the end piece 8 and a greater inner diameter than the extension 7 so as to form an annular channel between the extension 7 and the tube 9. The tube 9 is provided with a radial flange 10, which is an abutment surface for one end of a spring 11, the other end of which abuts against a contact surface of the female part 1. The spring 11 presses the tube 9 against the end piece 8, which in turn, via the extension 7, urges the valve element 4 to the closed position shown in FI
REFERENCES:
patent: 4564042 (1986-01-01), Ekman
patent: 5123448 (1992-06-01), Kjellberg et al.
patent: 5179976 (1993-01-01), Boland et al.
patent: 5337782 (1994-08-01), Wilcox
patent: 5482083 (1996-01-01), Jenski
patent: 5592970 (1997-01-01), Stucchi et al.
Bo Erik NYBERG
Ferensic Denise L.
Kim Joanne Y.
LandOfFree
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