Fluid handling – Larner-johnson type valves; i.e. – telescoping internal valve...
Patent
1994-10-24
1996-02-13
Michalsky, Gerald A.
Fluid handling
Larner-johnson type valves; i.e., telescoping internal valve...
251282, 251333, F16K 3144, F16K 324, F16K 112
Patent
active
054905354
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a valve for controlling a fluid medium flowing under pressure, comprising inlet openings and outlet openings, an inlet member having the medium flowing axially therethrough, a sleeve-shaped control member axially displaceable between a closed and an open position in relation to the inlet member, a first radially projecting, elastic sealing ring and a first annular sealing edge which is adapted to be pressed sealingly against the first sealing ring in the closed position of the control member, whereby the displaceable control member is enclosed by a valve housing and the space between the control member and valve housing is acted upon with the fluid medium flowing under pressure so that essentially no resulting pressure in axial direction is present at the control member and therefore the control member is displaceable without any appreciable expenditure of force, a second radially projecting, elastic sealing ring is provided in axial spaced relation to the first sealing ring and a second annular sealing edge is adapted to be pressed sealingly against the second sealing ring in the closed position of the control member.
A valve of this type is known from U.S. Pat. No. 3,654,950. The first and second sealing rings provided therein are U-shaped and formed from a flexible material with two legs, between which a spring is inserted. Shortly before reaching the closed position, the one leg is pressed forcibly against one of the first and second annular sealing edges due to a differential pressure. As a result of this strong pressing action, there is, of necessity, a relatively large areal contact between sealing ring and sealing edge so that a relatively large force must be applied when opening the valve.
When such valves are used in mining and underground workings, they are controlled and supplied from a central control device via data lines which are known per se. Since only small electrical currents ought to flow in these data lines in view of a possible risk of explosion, the supply to the valves presupposes a low intrinsic current requirement and therefore as small an actuating force, in particular opening force, as possible. The known valve does, however, have a high intrinsic current requirement due to the large opening force required.
The object of the invention is to improve a valve of the generic type such that it is easy to open with a more or less infinitesimal expenditure of force, whereby the valve is also intended to allow, in particular, the control of fluid media flowing under very high pressure.
The object is accomplished by the invention, in a valve of the generic type, in that the first and second annular sealing edges are designed to be relatively sharp and like knife edges and in a closed position of the valve form a sealing region in the form of a circular line between the first and second sealing rings, on the one hand, and the first and second sealing edges, on the other hand.
The following description comprising the preferred embodiments of the invention serves to explain the invention further in conjunction with the attached drawings.
In the drawings:
FIG. 1 is a sectional illustration of an inventive valve for controlling a fluid medium flowing under pressure in a closed position;
FIG. 2 is a sectional illustration of the valve from FIG. 1 in an open position;
FIG. 3 is an enlarged, sectional, individual illustration of a tubular inlet member and a sleeve-shaped control member axially displaceable thereon in a closed position;
FIG. 4 is a sectional view of a second embodiment of an inventive valve in a closed position;
FIG. 5 is a sectional view of a third embodiment of an inventive valve in an open position;
FIG. 6 is a sectional view of a fourth embodiment of an inventive valve in an open position;
FIG. 7 is a sectional view of a fifth embodiment of an inventive valve in an open position.
A valve 1 illustrated in FIG. 1 in a closed position has a valve housing 2, preferably made of metal, in which an axial valve bore 3 is located. A tubular, likewise preferab
REFERENCES:
patent: 2010416 (1935-08-01), Schlagenhauff
patent: 3654950 (1972-04-01), Hamm
Bebro-Electronic Bengel & Bross GmbH
Michalsky Gerald A.
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