Fluid handling – Systems – Flow path with serial valves and/or closures
Patent
1998-05-18
2000-04-11
Ferensic, Denise L.
Fluid handling
Systems
Flow path with serial valves and/or closures
13761411, 137613, 251 635, 251 63, F16K 31222, F16K 31143
Patent
active
06047730&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an actuating device for double seat valves with two individually movable closure members.
A generic actuating device for double seat valves is known from the company publication UNIVENT Doppeldicht-Ventil TYP 916 [UNIVENT Type 916 double sealed valve], GEA AHLBORN, Sarstedt. This solution is a space saving actuating device in which the main adjustment mechanism and individual adjustment mechanisms are combined in a common drive housing; because of the proposed piston arrangements, however, the state-of-the-art solution does not at all provide the possibility of externally adjustable partial stroke limitations for both closure members when such are required.
The state of the art in question was developed to the effect that there is provided between the drive housing and valve housing a so-called lantern (spacer) which makes it possible, with the piston arrangement otherwise unchanged, to provide at least one partial stroke limitation for the dependently actuated closure member in the main adjustment mechanism and an individual adjustment mechanism. Since the piston of the individual adjustment mechanism for the individually actuated closure member is provided between the main adjustment mechanism and the individual adjustment mechanism for the dependently actuated closure member, there is no possibility of providing externally adjustable partial stroke limitation for the piston. This lastnamed state of the art is documented by company data of the Cherry-Byrell Corporation, Cedar Rapids, Iowa, U.S.A.
In order to create the possibility of providing externally adjustable partial stroke limitations for both closure members, it has been proposed that the adjusting rod of the individually actuated closure member be extended to the outside through the main adjustment mechanism and that the individual adjustment mechanism required be mounted there, on a side of the actuating mechanism facing away from the valve housing of the double seat valve (DE 30 05 329 C2). Not only does an actuating device such as this differ fundamentally from the generic device, it also saves less space and in particular is more costly to install.
In a control mechanism for double seat valves disclosed in DE 31 08 973 C2, both adjusting rods extend upward through the main adjustment mechanism and are connected externally with each associated individual adjustment mechanism. Although this state-of-the-art actuating device does provide the possibility of making adjustable partial stroke limitations externally and from one side, the design as a whole is very costly and the dimensions excessive, in that the individual adjustment mechanisms are not integrated into the housing of the main adjustment mechanism but are rather added to this housing by way of an inserted spacer housing. In addition, a distinctly higher installation cost is required than with integrated actuation solutions.
A cleanable double seat valve with leakage control is known from DE 31 33 273 A1; in it both valve heads may be transferred to partly open positions individually and independently of each other. For this purpose the double seat valve has, below a main adjustment mechanism producing the full stroke, an additional adjustment mechanism having in a single housing cylinder compartments separated by pistons which are limited and individually controllable. This overall actuating device is also of a design which takes up much space, in that the individual adjustment mechanisms are not integrated into the housing of the main adjustment mechanism but are provided as added components between the main adjustment mechanism and a spacer housing connected to the valve housing. Adjustable partial stroke limitations are not provided. They are theoretically possible, but on smaller valve heads, only by extending the valve rod connected to a valve head through the main adjustment mechanism and providing adjustable partial stroke limitation above the latter.
The object of this invention is to develop a generic device by an installation friendly and space savin
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Coura Herbert Robert
Schreiber Jurgen
Ferensic Denise L.
Kim Joanne Y.
Tuchenhagen GmbH
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