Fluid handling – Processes
Patent
1989-08-31
1991-02-26
Walton, George L.
Fluid handling
Processes
137312, 13761413, 13762548, 1376275, 2513353, 251900, F16K 300, F16K 11065, F16K 5100
Patent
active
049954164
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for controlling the medium inlet into at least one leakage cavity of a valve and an apparatus for its performance.
The state of the art known so far in the field of the so-called leak-proof polyway-switching valves can e.g. be gathered from DE-PS 20 27 792. In the cleansing position and/or the sterilizing position, this valve satisfies (cp. column 5, lines 40 et seq.) the minimum requirement to be met, namely that there must exist, at any time, at least two seals between the filling material to be packed and e.g. a cleansing agent for the vessels, and that the space between the seals is to be rinsed with the cleansing agent. In analogy with field of pneumatics, the known valve constitutes a so-called 4/2-way valve, since it is provided with four connections (three casing connections, one leakage cavity connection) and two switching positions. There is not given a normal position in which the valve, as seen from the middle valve casing part, is either open or closed at both sides. From FIG. 2 of the above cited reference, it is furthermore evident that in the illustrated filling position of the valve there exists only a simple sealing between the middle valve casing part 3 and the lower valve casing part 4. While in this position, product is transferred from the upper valve casing part 2 to the middle valve casing part 3, and pressurized cleansing agent can basically stand in line in the lower valve casing part 4. In this case a defective sealing in the lower seat region or an impact of pressure from the lower valve casing part 4 would lead to a mixing of product and cleansing agent, since the lower seat region is not protected against leakage.
German patent application No. P 37 01 027.1 furthermore describes a valve with a leakage cavity, which is provided with two sealing places disposed in series and in the closed position of the valve prevents the overflow of fluids from one valve casing part into another. There the leakage cavity is disposed between the sealing places and connected with the environment of the valve via the valve casing. With this so-called double seat valve, the technical problem of controlling the medium inlet from the inner space to the leakage cavity not only in the closed position of the valve but also in other positions of the valve is solved. The solution of the procedural problem is achieved by controlling the connection between the leakage cavity and the inner space in positions other than the closed position of the valve with the same effect and in the same manner as in the closed position by means of an arrangement providing a substitution for the closing member with respect to its interaction with the leakage cavity. With a view to the concrete realization of this substitution there is inter alia provided a shutter element which, with respect to the closing member, is disposed in relatively mobile relation in the direction of the degree of its freedom of motion and controls the connection between the leakage cavity and the inner space of the valve casing parts. In the course of this, at least in the open position of the valve, the shutter element is in permanent contact with the two sealing places, these sealing places comprising sealing means disposed on the side of the valve casing, or on the side of the closing member or the shutter element, respectively.
From the above mentioned German patent application there is also known a sealing arrangement comprising two separate seals disposed on the side of the valve casing; in the Euro-PCT-application (WO 88/05512) claiming the priority of said German patent application, these two discrete seals inter alia are seals with an annular cross section.
Starting out from the prior art shown, it is the object of the invention to create a process for the control of the medium inlet into at least one leakage cavity of a valve, wherein the valve comprises more than two valve casing parts with feed and drain casing parts and in particular has controllable connections between the leakage cavity and the inne
REFERENCES:
patent: 2485504 (1949-10-01), Morgan
patent: 3819152 (1974-06-01), Clippard, III
patent: 3938543 (1976-02-01), Sorenson
patent: 3973583 (1976-08-01), Sorenson
patent: 4314579 (1982-02-01), Wheatley et al.
patent: 4418711 (1983-12-01), Stoll et al.
patent: 4566479 (1986-01-01), Rotte et al.
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