Valves and valve actuation – Valve – Seats
Patent
1997-07-02
1999-06-15
Chambers, A. Michael
Valves and valve actuation
Valve
Seats
251360, 251366, F16K 3100
Patent
active
059114070
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a metal valve housing having highly stressed regions.
In the case of valves, which are intended for corrosive fluids, it is known to line the housing with a material which is resistant to the fluid (Federal Republic of Germany 26 48 729 A1). In this known valve the housing serves merely to support the lining.
In a directional control valve in accordance with DE 21 61 386 C2, the valve housing consists of plastic which encloses the metal parts intended for the valve function, such as a guide bushing with control edges for the control piston and feed and discharge lines, and receives the fastening plate. Furthermore, from DE 12 95 944 a valve tappet is known which is developed as a composite body of cast iron and steel. The cast-iron section is cast onto the steel section by suitable measures.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a valve housing having highly stressed regions, such as, for instance, the control edges of directional control valves, which housing can be produced by known sand-casting methods and assures a long life of the regions of the housing subject to high stresses. According to the invention the housing webs are formed of independent metal rings which are made of a material which is substantially resistant to stressing and have been bound to the housing body upon casting of the housing body. Due to the fact that only the highly stressed regions of the housing consist of a material, such as steel which can withstand these stresses, and thus can be easily attached as independent parts to the casting core and introduced together with it into the mold, the body of the housing can be cast in known manner, in which connection the independent parts attached to the core are connected and welded together with the housing body in form-locked or material-locked manner.
BRIEF DESCRIPTION OF THE DRAWINGS
With the above and other objects and advantages in view, the present invention will become more clearly understood in connection with the detailed description of preferred embodiments, when considered with the accompanying drawings of which:
FIG. 1 is an axial section through a cast directional control valve housing with sand core;
FIG. 2 is an axial section through a part of a cast seat-valve housing with sand core;
FIG. 3 is an axial section through a part of a cast seat-valve housing with sand core in which the control edge is formed by a bushing; and
FIG. 4 is an axial section through a core mold.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, 1 is the housing body cast of cast iron of a directional control valve which has a circumferential pump control space P, working control spaces A, B in communication with loads (not shown) and outside tank control spaces T. The control spaces are separated from each other by webs 2, 3, 4, 5 formed of steel rings, and the outside tank control spaces T are limited towards the outside by steel rings 6 and 7. The steel rings are surrounded by the sand core 10 on three sides and are introduced into the housing casting mold together with the sand core. Upon the pouring of the liquid cast iron, the free outer circumferential surface 11 of the steel rings is bound to the housing by fusion. After removal of the sand core 10, the inner, more densely hatched region 13 of the steel rings is finish-machined. The regions 13 serve for the guidance of the control piston (not shown) and as control edges which cooperate with corresponding control edges of the control piston (not shown) in the manner that adjacent control spaces A-T, P-B and P-A, B-T respectively are connected to each other in the one or other direction of flow of the fluid. During the finish-machining of the steel rings, there is no danger of the rings breaking off in the region of the control edges, as is the case with traditional housings in which the webs also consist of cast iron. The oversize of the steel rings for their finish machining can be kept smaller than in the case
REFERENCES:
patent: 2739613 (1956-03-01), Kulikoff
patent: 5078179 (1992-01-01), Amrhein
Lukasczyk Wolfgang
Rub Karl
Chambers A. Michael
Farber Martin A.
Mannesmann Rexroth AG
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