Fluid handling – Systems – Multi-way valve unit
Patent
1992-08-11
1994-04-12
Rivell, John
Fluid handling
Systems
Multi-way valve unit
1376254, 251 54, 188298, 18832218, F16K 1106, F16K 3172
Patent
active
053017161
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sanitary water fitting, especially in the form of a single-handle mixing unit, with a casing, an activation handle, and with a control unit presenting a disk, piston, balls, or the like, as well as with a closing damper to extend the closure time and reduce the closure rate arranged between the handle and the fitting casing, whereby the closure damper is designed as a liquid-filled piston and cylinder unit.
A water fitting of this type is described in EP-0 214 358 B1, whereby a closure damper is arranged between the handle and the control unit or between the handle and the fitting housing, which provides for a prolonging of the closure time and a reduction of the closure rate. The document is limited with respect to its solution proposal for the concrete designing of the closure damper to referring to a piston and cylinder unit in which especially liquid is compressed between the damper piston and the damper cylinder, which in the final phase of the closure process of the sanitary water fitting of this type necessarily leads to a prolongation of the closure time and reduction of the closure rate, without this being disturbing to the user.
The object of the present invention is therefore, in an extension of the water fitting of this type, to provide an expanded solution proposal for the suitable designing of the piston and cylinder unit as a closure damper.
The solution of this task, including advantageous designs and extensions, appears in the contents of the claims accompanying this specification.
In its basic concept, the invention proposes a liquid-tight membrane surrounding the piston and cylinder unit outside connecting with the cylinder on the one hand and the piston on the other, watertight in both cases, which forms a membrane chamber when the piston is pushed in, and for a flow connection to exist between the inside space of the cylinder sealed against the piston and its outside surrounded by the membrane. The concept of an exclusive compression of the liquid in the closure movement is thereby abandoned, because the liquid in the cylinder space at first compressed in the compression movement of the piston over a definite flow route into a membrane chamber formed by a liquid-tight membrane enclosing the piston and cylinder unit outside is expelled and flows back into the inside space in the exahust movement of the piston. This entails the advantage that the closure damper is more adjustable in its damping behavior in the closure movement of the fitting, and it assumes its initial position for the closure movement more rapidly in the opening of the water fitting, since the liquid can rapidly flow back into the cylinder inside space.
One execution example of the invention provides for the purpose for the piston to be sealed liquid-tight against the cylinder by means of a sealing ring inserted into an encircling piston groove, whereby the groove presents a notch for designing a flow connection from the cylinder inside space with the membrane chamber arranged at the outside going around the sealing ring over one peripheral section. This assures the possibility of the liquid being able to flow back at the sealing ring into the cylinder inside space in the compression and exhaust movements of the piston. For this purpose, the specified height of the piston groove in the movement direction of the piston is greater than the diameter of the sealing ring, so that the sealing ring is suitably shifted according to the compression and exhaust movements of the piston against the cylinder and more or less releases the flow connection created by the notch design.
It is proposed according to one execution example of the invention for the notch to consist of a deepening of the piston groove on the piston side and for it to extend until the end of the piston. It is advantageous in this connection, according to one form of execution of the invention, for the notch to overtop the assigned upper edge of the piston groove with a section narrowing in the exhaust direction of the piston, because
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American Standard Inc.
Knab Ann M.
Rivell John
Robinson Elaine Brenner
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