Gate valve

Details Gate valve Gate valve

1991-07-22

1992-09-01

Michalsky, Gerald A.

Valves and valve actuation

Reciprocating valve

Gate

137315, 137375, 251267, F16K 300

Patent

active

051433508

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a one-piece armature housing.
Such an armature is known from the French patent application 2,266,069. In order to permit mounting of the closing wedge inside the housing, the latter exhibits the characteristic that, of the two connecting pipes between which the sliding wedge is to be disposed so as to form a seal, only one is equipped with a seating ring. The housing parts holding the seating ring, as well as the seating ring, reduce the flow cross section which is smaller than the nominal width of the armature. These components are missing at the opposite connecting pipe thereby making it possible to insert the sliding wedge in the housing. For the sliding wedge to maintain pressure against the seating ring, the pressure connection without a seating ring is provided with two inclines which are transverse to the flow direction and lie opposite one another. These cooperate with suitable protrusions on the sliding wedge to thus maintain pressure in the closed position. The inclines must have dimensions which, on the one hand, permit reliable pressing to be achieved and, on the other hand, permit passage of the sliding wedge and connection thereof to the driving spindle.
Since, for installation, the valving element must be smaller than the cross section of the openings in the couplings, the corresponding seat cross section is consequently relatively small and the ratio of coupling cross section of the armature housing to seat cross section exceedingly unfavorable. Taken in conjunction with the requisite protruding inclines, this results in a poor flow coefficient zeta.


OBJECT OF THE INVENTION

For gate valves of the type indicated at the outset, it is an object of the invention to obtain a significantly better relationship between flow cross section and seat cross section for the same valve size while, at the same time, improving the flow characteristics.


SUMMARY OF THE INVENTION

In surprising fashion, this object is achieved in that the valve seat is non-circular, particularly oval, and that a valving element which cooperates therewith has a non-circular sealing surface whose largest dimension is greater than the largest dimension of the opening cross section of the coupling used for installation.
In this manner, a ratio of 1:1 can be obtained between coupling cross section, which corresponds to the cross section at nominal width, and seat cross section. Together with the inclined disposition of the seating surface, an exceedingly advantageous flow coefficient is thus achieved. The flow coefficient is significantly less than half that of a normal valve thereby making substantial energy savings possible.
An embodiment of the invention provides for the valving element to have one or more guide cams which are known per se and abut one or more guides in the housing so as to prevent rotation. The guides can here be designed as ridges embraced by cams or protrusions, a groove which receives a cam or the like, and so on.
An embodiment of the invention provides for the valving element to be equipped with a non-rotary spindle. This assures reliable positioning of the valving element in the valve seat.
Other embodiments of the invention include different types of means for preventing rotation of the valving element. Thus, for one, the housing can have an internal contour which is oval, for instance, and permits the non-circular valving element to perform a stroke while simultaneously inhibiting rotation of the same. It is also possible to provide, between the valving element and the spindle, means such as a pin or the like, by way of example, for the prevention of rotation.
Another embodiment provides for the valving element to have a yieldable, sealing overlay. The valving element is then protected and a reliable sealing action is obtained even, for instance, in cast armature housings having unworked seating surfaces.
To protect the connection between spindle and valving element, a further embodiment provides for the yieldable, sealing overlay to abut and est

REFERENCES:
patent: 2420849 (1947-05-01), Wilson
patent: 3662778 (1972-05-01), Leopold et al.
patent: 3963214 (1976-06-01), Hackman et al.
patent: 4162058 (1979-07-01), Ellis

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