Fluid handling – Removable valve head and seat unit – Threaded into valve casing
Patent
1994-03-14
1995-04-18
Hepperle, Stephen M.
Fluid handling
Removable valve head and seat unit
Threaded into valve casing
251268, 251288, F16K 102
Patent
active
054069734
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a valve upper part for fittings, in which an axially movable valve piston and a rotary spindle which are connected together via a thread are placed in a head piece, in which interlinking polyhedra are provided on the valve piston and in the head piece for axial placement and a stop is provided to limit the axial movement and in which a sealing ring which projects beyond the front face of the head piece facing the inlet and is designed on the projecting outer front face as a surface for its rest position on a valve face of the fitting is retained by the head piece.
The discharge of water from sanitary fittings, for example, is controlled with the aid of valve upper parts. For this purpose the valve upper part is screwed into the housing of the sanitary fitting by means of its head piece; a rotary handle or a lever is placed on its spindle.
A valve upper part of the kind mentioned above is known (see US-PS 40 64 904). The known valve upper part has two opposing surfaces for placing the valve piston in the head piece. The axial movement of the valve piston is limited by means of a ring that is retained in the head piece, projects over the outer front face with a projection and projects into a rotary handle on which a projection pointing radially inwards is moulded. In the case of the known valve upper part, the approach point of the valve piston to the seal cannot be accurately fixed. A further drawback is the fact that the rotary handle is required in order to limit the axial movement; this means that only certain rotary handles can be used and thus limits the application of the valve upper part.
This is where the invention intends to provide assistance. The object of the invention is to design a valve upper part of the above-mentioned kind in such a way that the approach point of the valve piston to the seal, which can, moreover, be designed as a geometrically simple seal, e.g. with round or square cross-section, can be accurately fixed. This object is achieved according to the invention in that the axial movement of the valve piston is limited by a stop arranged internally in the head piece and externally on the spindle, in the same cross-sectional plane, and that the internal polyhedron of the head piece and the external polyhedron of the valve piston is formed by teeth which are designed as equilateral triangles in the front view.
The design of a polyhedron for guiding a valve cone in a valve chamber as a triangle in cross-section is essentially known (cf. DE-GM 18 27 237).
The internal polyhedron on the head piece and the external polyhedron on the valve piston which engages in this internal polyhedron are provided for axially guiding the valve piston so as to prevent distortion and for accurately fixing its approach point to the sealing ring which projects over the front face of the head piece facing the inlet. The axial movement of the valve piston in the direction of this front face and hence of a valve face of the fitting is limited by the stop which is formed by a stop surface on the spindle on the one hand and by a stop surface in the head piece on the other hand. The stop surfaces come to rest when the spindle is rotated in the direction of closure. The rest position is the closed position of the valve upper part. With a number m of teeth on the polyhedron and with a pitch n of the movement thread between valve piston and spindle, the accuracy with which the approach point of the valve piston to the seal can be fixed is the ratio m
. In the opposite direction also, i.e. in the return stroke, the axial movement of the valve piston is limited by the stop, viz. by counter-stop surfaces in the spindle and the head piece. It is advantageous to select the stops in such a way that the angle of rotation of the spindle is approx. 270.degree. . The angle of rotation of the spindle can then be set to any angle under 270.degree. by means of a setting screw and a stop pin in the spindle.
Embodiments and further developments of the invention are described in the sub-claims. An example
REFERENCES:
patent: 3082786 (1963-03-01), McLean
patent: 4064904 (1977-12-01), Tolnai
patent: 4138091 (1979-02-01), McGee
patent: 4860784 (1989-08-01), Petersen et al.
patent: 5103857 (1992-04-01), Kuhn et al.
Lange Peter
Ziebach Helmut
Fluehs Drehtechnik GmbH
Hepperle Stephen M.
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