Fluid handling – Processes
Patent
1988-09-02
1992-02-04
Walton, George L.
Fluid handling
Processes
137240, 137312, 13761417, 13761418, 13761419, 134166C, F16K 1120, F16K 5100, B08B 900
Patent
active
050852418
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for controlling a leakage cavity of a valve according to the preamble of the main claim and an apparatus therefor.
A variety of valves having two sealing places provided are known. These sealing places are disposed in series and prevent in the closed position of the valve the overflow of fluid from one valve casing part into another one. All of these valves have in common that between the two sealing places there is disposed a leakage cavity discharging into the inside of the valve casing. Fundamentally this leakage cavity can be disposed in the closing body or the closing bodies, respectively, of the valve or in the casings thereof. In each case the leakage cavity inlet is located within the interior of the valve casing parts and is closed in all known valves of the category in question in the closed position of the valves by the closing body or the main regulating unit. The outlet of the leakage cavity is formed either on the closing body or closing bodies, respectively, or at the valve casing.
An analysis is given hereinafter of some known valves with two sealing places according to typical features and characteristics.
There are discussed the valves according to the German Utility Model 77 02 634, the European PS 00 98 418 and 02 05 627, the DE-OS 25 05 544, DE-OS 22 20 589 and DE-OS 35 16 128. In addition, a valve of the category characterized in the introduction became known under the designation VPL "SAFE FLOW" Valves by a company pamphlet of Messrs. PASILAC FLOW EQUIPMENT A/S (hereinafter briefly named "PASILAC").
The known valves according to GM 77 02 634, EP 00 98 418 and EP 02 05 627 each comprise two closing members of which either both are designed as seat disks (GM 77 02 634), or both as slides (EP 00 98 418), or one closing member as seat disk and the other as slide (EP 02 05 627). The known valves according to DE-OS 25 05 544, DE-OS 22 20 589, PASILAC and DE-OS 35 16 128 each have only a single closing member, the first three representatives comprising each one seat disk; the last one comprises a slide.
It is shown by the above indicated publications also that in all instances the leakage cavity inlet is closed in the closed position of the valve by the closing body or the main regulating unit, respectively.
In the valves according to GM 77 02 634, EP 00 98 418 and EP 02 05 627 is the leakage cavity outlet located in one of the two closing bodies, in the valve according to DE-OS 25 05 544 in the sole closing body. In the valves according to DE-OS 22 20 589, PASILAC and DE-OS 35 16 128 the leakage cavity outlet is provided in the casing.
In the open position of the valve the leakage cavity outlet is, according to the respective publication, closed by the auxiliary regulating unit only in the valves according to DE-OS 25 05 544, PASILAC and DE-OS 35 16 128. In all other known valves indicated above such a locking is indeed possible in principle, but is not explicitly mentioned.
Besides the normal switching function (open/closed) and in connection with the above-indicated property to prevent in the closed position of the valve the overflow of fluid from one valve casing part into another one, practice is posing more extensive demands on such valves, in particular for their use in fields of food processing and beverages, of Pharmacy and of Chemistry, to be satisfied either individually or in their entirety. Thus it is often desirable that the leakage cavity and the seat surfaces of the valve, individually and independently from one another, can be cleaned by lifting the respective closing member in question. This property is indicated for instance for the valves known from GM 77 02 634 or EP 02 05 627, respectively.
In addition it is often desirable that the leakage cavity can be cleaned not only in the closed position of the valve but also in its open position by cleansing fluid advanced from outside the valve. Such provisions are given for the valves known from GM 77 02 634, EP 00 98 418 and EP 02 05 627.
For reasons of safety it is often necessary that pres
REFERENCES:
patent: 4304251 (1981-12-01), Schadel et al.
patent: 4368753 (1983-01-01), Brakelmann et al.
patent: 4373545 (1983-02-01), Knappe
patent: 4436106 (1984-03-01), Tuchenhagen et al.
patent: 4522223 (1985-06-01), Balsys et al.
patent: 4617955 (1986-10-01), Melgaard
patent: 4655253 (1987-04-01), Ourensma
patent: 4687015 (1987-08-01), Mieth
patent: 4856551 (1989-08-01), Brakelmann
LandOfFree
Process for controlling a leakage cavity of a valve and an appar does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for controlling a leakage cavity of a valve and an appar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for controlling a leakage cavity of a valve and an appar will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-342412