Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1993-12-06
1996-11-19
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
134166C, 137240, 13761417, 13761418, B08B 304, B08B 902, F16K 1120
Patent
active
055753051
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a procedure for cleaning a double seat valve under the heading of claim 1 and a valve arrangement for implementing the procedure under the heading of claim 8 or 9. A method of the type characterized above is known from DE 31 08 778 C2. This procedure solves the problem of cleaning both seat surfaces of the closing members in a valve of the type under discussion simultaneously. In doing so, the cleansing and/or disinfecting agent is introduced either from outside the double seat valve through the leakage hollow space or through a valve housing part to both exposed seats (compare FIGS. 1-5a of the drawings).
In EP-A-0 208 126, the procedure known from DE 31 08 778 C 2 is further developed in such a way that in a double seat valve equipped with a slider and a seat plate, for the purposes of cleaning the seat of the slide type closing member, the seat is movable only in the direction of the associated valve housing, while the seat plate remains on its seat surface. The cleansing agent is introduced from outside of the double seat valve via the leakage hollow space to the exposed seating surface. This as well as the older procedure contributes to cleansing a relevant double seat valve area, namely the seat area. Nonetheless, in practice it is necessary to include other relevant areas in the cleaning procedure, those of the rod passage guides through the associated valve housing parts.
In valves with slide type closing members, it is necessary to take special precautions so that the compressive forces exerted by the fluid in the conduits upon the closing members can be absorbed. These forces may be compensated for either through suitable measures in the valve drive or through pressure compensating measures on the closing member in the valve housing area (cf. EP-A-00 39 319, FIG. 1; EP-A-0 208 126, FIG. 3.2). The former measure leads to driving gears of relatively large dimensions, while pressure-compensating measures on the closing member naturally require large rod guide passages, which are problematic simply because of their large sealing length with regard to their ability to be cleansed and their safety with reference to mixing product and cleaning fluid.
It is known from EP-A-00 39 319 that a chamber should be placed between the seals of the pressure compensating piston which can be rinsed by cleansing agents. In order to ensure sufficient cleansing agent throughput, there must be a sufficiently large static pressure where the cleansing agent enters. Nonetheless, for safety reasons, it is generally desirable that the cleansing agent is subject to as little pressure as possible on the rod seal facing the interior area of the valve housing. In any case, one must nonetheless take care that at certain time intervals the area behind the seal, with its relatively large circumferential length (into which, because of the actuating movement of the valve, product can occasionally be dragged), and the contact surfaces between seal and rod can be subjected to or irrigated by cleansing agents. It is shown in DE 37 01 027 A1(cf. FIGS. 7 and 8) how two particular sealing points arranged in series on the side of the housing which act together with a slide type closing member whose intermediate space can be rinsed from time to time in the area of one of the sealing points without having to expose the entire seating area of the closing member. While the previously cited figures show a one piece seal with two sealing points, the possibility of seal arrangements with two separate seals follows from the introduction of the description and the claims. Separate cleansing of two seals arranged at a distance on the side of the housing interacting with a slide-like closing member, or with a rod guided out of the valve housing by a partial displacement of the closing member or of the rod for the purpose of exposing one or the other seal to the valve housing part which contains the cleansing agent is explained in greater detail in publication W 0 88/05512(cf. e.g. FIGS. 21, 22; 25, 2
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Davis David L.
Otto Tuchenhagen GmbH & Co. KG
Walton George L.
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