Fluid handling – Removable valve head and seat unit
Patent
1988-05-12
1989-11-21
Nilson, Robert G.
Fluid handling
Removable valve head and seat unit
277186, F16K 308
Patent
active
048815705
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a seal for valves, in particular for upper valve parts, consisting of a profiled ring of a rubber elastic material, in which a supporting ring is arranged.
2. Brief Description of the Prior Art
A seal of the above-mentioned type is known from the volume control valve described in DE-A1-3 206 481. The supporting ring in the known seal has a rectangular cross section; the profiled ring is formed as a lip seal. An annular recess with a rectangular cross section is provided in the profiled ring and accommodates the supporting ring. The external surfaces of the supporting ring and the profiled ring lie on the same cylindrical surface.
DE-C2-3 207 895 and DE-A1-2 944 520 disclose upper valve parts which in each case comprise a fixed valve seat disc (fixed disc) which is made of a ceramic material, is connected to the internal end face and on which a mobile valve seat disc (control disc) which is also of a ceramic material slides internally and against which a sealing ring rests externally. The sealing ring, which is prestressed, rests loosely against the fixed disc and the housing of the upper valve part and projects beyond the end face.
The sealing ring serves on the one hand as a seal for the housing and the fixed disc and on the other hand as a seal for a valve seat which is provided in a lower valve part with which the upper valve part co-operates. The use of the sealing ring means that the pressure of the component part assembly in the upper valve part cannot be accurately adjusted. Too great a pressure may make the parts stiff, while too low a pressure may result in leakages. Furthermore, due to the adhesive effect between the sealing ring and the valve seat, the upper valve part may unintentionally be dismantled. Unauthorised persons may dismantle the sealing ring.
SUMMARY OF THE INVENTION
The invention aims to remedy the above noted problems of the prior art. The object of the invention is to provide a seal which can be accurately fixed in a valve, in particular in an upper valve part, even in the area of its free end faces. According to the invention, this object is either solved in that the supporting ring is formed as a threaded ring which is provided with an external thread, is vulcanized into the profiled ring and the external part of which projects beyond the external surface of the profiled ring or in that the supporting ring is formed as an unslotted spring ring which has a cross section in the form of a horizontal L, the back of which rests against the internal end face of the profiled ring and the external part (base) of which embraces the external surface of the profiled ring.
After it has been inserted in a valve, the seal according to the invention has a defined position. The pressure of the component part assembly of the valve can therefore be accurately adjusted by means of torque wrenches. The number of parts which are not watertight due to too low a pressure and the number of stiff parts due to too great a pressure are minimised. Dismantling from the water supply side by non-experts is not possible, or at least only with difficulty. As dismantling from the opposite side, as in the case of the known upper valve parts, is impossible, the upper valve part as a whole cannot be dismantled after it has been installed. Loads taken up by the sealing ring are not transmitted to the inlet disc, but rather to the supporting ring and from the latter to the housing. The load is removed from the inlet disc. Irrespective of different contact pressures, which are determined by the different shapes and depths of the valve seats of the lower valve parts, the pressure between the inlet disc and the control disc is constant. This is of particular importance when the upper valve part is used in the hot water area: After a layer of grease between the discs has been washed away in the course of continuous use, the parts cannot become stiff.
BRIEF DESCRIPTION OF THE DRAWINGS
Two embodiments of the invention are illustrated in
REFERENCES:
patent: 3780758 (1973-12-01), Devries
patent: 3831621 (1974-08-01), Anthony
patent: 3913612 (1975-10-01), Tolnai
patent: 4005728 (1977-02-01), Thorp
patent: 4172599 (1979-10-01), Forch
patent: 4240643 (1980-12-01), Becker
patent: 4544168 (1985-10-01), Hans
Lange Peter
Ziebach Helmut
Fluhs Drehtechnik GmbH
Nilson Robert G.
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