Valves and valve actuation – With means to increase head and seat contact pressure – Fluid pressure
Patent
1990-06-12
1992-02-11
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
Fluid pressure
251195, F16K 316
Patent
active
050870173
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a gate valve and more particularly to a valve body for a non-sliding type gate valve for high vacuum use.
BACKGROUND ART
Conventionally, such a gate valve for high vacuum use generally comprises a valve housing, and a valve body mounted thereto adapted to open and close the valve opening formed in the valve housing. The valve body comprises a valve plate and a counter plate arranged opposite to each other, and the valve plate is adapted to close the valve opening by being urged against the valve seat formed in the valve housing. In a gate valve of this kind, in order to urge the valve body against the valve seat to perform a sealing action thereto, mechanism such as those using a linkage, a shifting mechanism with taper blocks, or a mechanism utilizing balls or rollers, etc. have been used.
However, it has been well-known that these mechanisms reveal various problems in that they all have members such as rolling members, shifting members, etc., which move relative to each other, so that during the use of the gate valve in a highly vacuum atmosphere the relatively moving members may become clogged, making the opening or closing of the valve body impossible, its rapid opening or closing impossible, or dust may be generated due to the relative movements of the members, etc.
In order to solve these problems to some extent, gate valves have already been proposed in which as a sealing mechanism a metallic bellow, diaphragms, etc. are used, and two types of these valves are known, i.e. one in which double bellows are arranged concentrically on the valve seat confronting the valve plate, the other in which a metallic bellows is arranged between the valve plate and the counter plate. Among these types, in the former, since the bellows is arranged at the side of the valve seat it has a complicated constitution, and is thicker and excessively heavy in comparison with the latter type. On the other hand, the latter type has such defects that, since the weight of the valve plate portion is great owing to the arrangement of the metallic bellows, a guide mechanism for preventing the valve plate from oscillations, etc., the relatively sliding portions need to be provided within a high vacuum environment.
Thus, it will be apparent that in these proposed gate valves for high vacuum use there are also various problems in their constitution.
As a gate valve for high vacuum use, the present applicant has already proposed an invention entitled "A Non-Sliding Gate Valve for High Vacuum Use" as Japanese Patent Application No. 62-86937, filed on Apr. 10, 1987, for the purpose of resolving the problems inherent to hitherto known gate valves.
As apparent from the Specification and drawings of the above previously proposed patent application, this "non-sliding gate valve for high vacuum use" has the following constitution as shown in FIGS. 2 and 3 of the appended drawings.
The gate valve comprises a hollow box-like valve housing 1 having substantially an elliptical configuration when viewed in an elevational view and of a shallow depth when viewed from the side, and a valve body 2 disposed therein and having substantially a circular plate-like shape, the valve body 2 being adapted to close or open the valve opening 1.sub.1 formed axially in the valve housing 1. On the outside of the valve housing 1, on its top wall 3 a pair of brackets 4.sub.1 , 4.sub.2 are vertically secured thereto with a gap being left therebetween in the longitudinal direction of the top wall 3 (see FIG. 3), a bearing member 5 having substantially an inverted U-shaped configuration being disposed within the gap between the brackets 4.sub.1 and 4.sub.2 with its leg members 5.sub.1 and 5.sub.2 being pivoted to the confronting brackets 4.sub.1 and 4.sub.2, respectively, by pivot 6.sub.1 and 6.sub.2, respectively. The central web portion 5.sub.3 of the bearing member 5 has a hollow bar-like rod 7 centrally secured near its upper end portion, the valve body 2 being radially secured to the rod 7 at its lower end. Swin
REFERENCES:
patent: 3524467 (1970-08-01), Worley
patent: 3717322 (1973-02-01), Bernard
patent: 4157169 (1979-06-01), Norman
patent: 4381100 (1983-04-01), Schoenberg
Hayashi Yuzo
Irie Norikimi
Sawa Toshio
Fox John C.
Irie Koken Kabushiki Kaisha
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