Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing
Patent
1989-08-31
1991-09-17
Rosenthal, Arnold
Fluid handling
With cleaner, lubrication added to fluid or liquid sealing...
Cleaning or steam sterilizing
137246, 251318, 251900, F16K 324, F16K 2500
Patent
active
050485555
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and an apparatus for protecting and for supporting a seal of a valve.
A valve of the initially identified group of the art is known from DE-A-37 01 027 and also from European Patent Application 0 279 177. The subject matters of the above mentioned patent applications according to the respective preambles of the main claims start out from a valve with a leakage cavity which is provided with two sealing places arranged in series to prevent in the closed position of the valve the overflow of fluids from one valve casing part into another. In the last mentioned patent application, the two sealing places inter alia are realized by means of a sealing arrangement comprising two separate seals arranged on the side of the valve casing, said two discrete seals inter alia being provided as seals with circular cross section. As far as the two known valves are concerned the leakage cavity is arranged between the sealing places and connected with the environment of the valve via the valve casing. These so-called double-seat valves, apart from the control of the medium inlet from the inner cavity of the valve to the leakage cavity known per se in connection with the closed position of the valve, solve the technical problem of controlling this inlet also in other positions of the valve. The solution of this technical problem is achieved in that the medium inlet from the inner cavity to the leakage cavity is controlled in positions other than the closed position of the valve by providing a substitute for the closing member to have the same effect as in the closed position with respect to its interaction with the leakage cavity. With a view to the actual realization of the object there is provided, among others, a locking element comprising an inner passage which is disposed in relatively mobile relationship to the closing member in the direction of the degree of its freedom of motion. Thereby the locking element, at least in the open position of the valve, is in permanent contact with the two sealing places or the two seals.
In each and every case of use, the known locking element is always in interaction with two seals or sealing places and, according to its purpose, it alone controls the medium inlet from the inner cavity to the leakage cavity between the two seals or sealing places.
As far as the known valves are concerned, the locking element takes over, in positions other than the closed position of the valve, the protection and the support of the two seals or sealing places, if these are realized by sealing means arranged on the side of the valve casing. For seals arranged on the side of the closing member, the known locking element in the proposed arrangement and its mode of operation do not provide any protection or support.
Starting out from the state of the art shown, it is the problem of the present invention to ensure, with a valve of the initially identified group of the art, protection and support of the seal in positions other than the closed position. It is now intended to mainly show solutions which protect and support, in particular, seals arranged on the side of the closing member.
The problem is solved by characterizing features. When applying the process of the invention to today's common valves these are provided with switching functions and properties which are novel and advantageous.
Advantageous embodiments of the valve for performing the above identified process are described.
One particular advantage achieved with the invention resides in the fact that the action principle known from DE-A-37 01 027 and EP-0 279 177 between a locking element and seals arranged on the side of the valve casing is consistently transferred and applied to valves of the most simple structure with a single on/off-function on the one hand and to complex valves with the most different switching functions and properties on the other hand. Thus, it was possible for the first time to dispose a seal with circular cross section, a so-called O-ring, with restricted mobility in a groove on the s
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patent: 3776260 (1973-12-01), Ruddick
patent: 4360039 (1982-11-01), Jeppsson
patent: 4605035 (1986-08-01), Rasmussen et al.
patent: 4647012 (1987-03-01), Gartner
Mieth Hans O.
Schlotterbeck Erich
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