Valves and valve actuation – Valve – Bodies
Patent
1991-07-22
1993-02-23
Chambers, A. Michael
Valves and valve actuation
Valve
Bodies
251366, F16K 5100
Patent
active
051883392
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a valve housing.
A housing for gate valves is known from the German Auslegeschrift 15 50 613 and is made of sheet metal shells. The housing shells in this known structure are shaped from sheet metal so that they are hinged to one another and merge seamlessly at the bottom of the housing. After shaping, the housing shells are bent up about the longitudinal axis of the housing chamber and are welded to each other at the abutting edges. Such a manufacturing method allows the disadvantageous weld seam in the bottom of the housing to be eliminated; however, this method is very expensive because of the additional bending procedure.
It is also known to so design a valve housing assembled from hemispherical shells that the weld seam connecting the two shell portions to one another is located in a plane which intersects the transverse and longitudinal axes of the valve (Sulzer technical bulletin, February 1973). In this known housing, which is associated with a low-pressure regulating valve, the weld seam runs around the entire housing without any breaks and without crossing another weld seam. In addition to connecting the housing shells, such weld seam also secures a part carrying the valve seat. This housing design, which is advantageous from as regards welding, has been used in a similar form for a ball cock housing (German Offenlegungsschrift 23 47 825).
The hemispherical shells employed in the known valve housings constitute only the central portion of the housing which must be completed on the sides with tubular stubs. Two additional weld seams must be provided for these tubular stubs which, for connection to a pipe, are equipped with a flange or are designed to be welded. Additional weld seams are formed when a housing mount or an intermediate floor is necessary to complete the valve.
OBJECT OF THE INVENTION
It is an object of the invention to provide a sheet metal valve housing which, while suitable for different types of shutoff valves and allowing favorable flow, can be produced with a small number of weld seams.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by a valve housing comprising a first shell having two sections which are inclined and seamlessly connected to one another. One of the sections has a first plane end face and the housing further comprises a second shell having two sections which are inclined and seamlessly connected to one another. One section of the second shell has a second plane end face which confronts the first plane end face, and the housing further comprises a seam of fused and hardened material which bonds the plane end faces to one another .
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side view of a valve housing,
FIG. 2 is a sectional view of the upper half of the main part of the valve housing illustrated in FIG. 1, and
FIG. 3 is a sectional view of the lower half of the main part of the housing.
DESCRIPTION OF PREFERRED EMBODIMENTS
The valve housing consisting essentially of a main part 1 and a housing mount 2 has flanges 3 welded thereto. The main part 1 is constituted by two shell portions 4,5. The shell portions 4,5--illustrated in FIGS. 2 and 3--are connected to one another by a circumferentially complete weld seam. A handwheel 6 forms the upper end of the valve.
The upper shell portion 4 and the lower shell portion 5 essentially constitute the peripheries of two conical frustums 7 which are bevelled at the end of larger diameter and, in the region of the bevel, seamlessly merge into a cylindrical zone 8 having a plane end. The conical frustum constitutes the simplest form of shell portion. However, modifications derived from the conical frustum are also feasible.
The upper shell portion 4 is provided with an opening 9 which is defined by an outwardly directed flange and serves for connection of the housing mount 2. Both shell portions 4,5 are provided with a cylindrical calibrater in the zone 8. The calibrater could also be conical or spherical.
The housing of the inventi
REFERENCES:
patent: 1148119 (1915-07-01), Patterson
patent: 2869221 (1959-01-01), Siepmann
Sulzer Technical Bulletin, Feb. 1973.
Bartoschek Manfred
Lovisetto Primo
Chambers A. Michael
Kontler Peter K.
KSB Aktiengesellschaft
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