Valves and valve actuation – Lost motion between actuator and valve – Check valve with external opening and closing means
Patent
1992-04-09
1993-09-07
Chambers, A. Michael
Valves and valve actuation
Lost motion between actuator and valve
Check valve with external opening and closing means
251357, F16K 3144
Patent
active
052421481
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an upper valve part for fixtures, in which an axially movable valve piston and a rotatable spindle are guided in a headpiece and are connected with one another via a thread.
Upper valve parts are used, for example, for controlling the water outflow from sanitary fixtures. To this end, the upper valve part is screwed with its headpiece into the housing of the sanitary fixture; a control knob or handle is fitted onto its spindle.
STATE OF THE ART
Two basic groups of upper valve parts can be distinguished depending on the manner in which the water flow is controlled in the region of a valve seat provided coaxial to the valve piston in the housing of the sanitary fixture. In one group (cf., for example, DE 85 24 528 U1), once the upper valve part has been screwed into place, a valve disc provided on the end face of the valve piston rests upon the valve seat with a sealing disc, which is secured to said valve disc. A rotation of the control knob results in a rotation of the spindle, which is converted via the thread into an axial movement of the valve piston, so that the valve seat is released by the valve disc with the sealing disc in proportion to the rotation of the control knob. A rotation of the control knob in the opposite direction results in the closure of the valve. In the other group (cf., for example, DE 32 07 895 C2), a sealing ring is immovably clamped between the headpiece and the valve seat. In the region of the end face of the headpiece facing the water supply a fixed disc made of ceramic material is held, which is provided with through openings. Instead of the valve piston, a carrier is provided which is rotatable together with the spindle. A control disc of ceramic material, which is also provided with through openings and rests against the side of the fixed disc facing away from the water supply, is held by the carrier. A rotation of the control knob results in a rotational movement of the spindle and the carrier, so that the control disc opens or closes the through openings of the fixed disc in proportion to the rotation of the control knob.
REPRESENTATION OF THE INVENTION
The invention aims to provide a further group of upper valve parts. It is the object of the invention to minimize wear and disturbances in the case of an upper valve part, which are essentially caused in the first group by the sealing disc coming to rest upon and lifting off the valve seat and in the second group by the sliding contact of the ceramic discs against one another. This object is attained according to the invention in that a sealing ring is held by the headpiece, which sealing ring projects beyond the end face of the headpiece facing the supply duct and is designed on the projecting outer end face as a surface for resting against a valve seat and on the opposite inner end face as a lip seal, which cooperates with the valve piston, which in its section cooperating with the lip seal is designed in a flat and seal-free manner.
According to the invention, the sealing ring rests with its outer end face against the valve seat. The term "valve seat" is also understood to mean the flat shoulder of a stepped bore formed in a housing. The position of the sealing ring is determined by the headpiece and is dependent upon whether the upper valve part is in the closed or open state. When the upper valve part is closed, the lip seal of the sealing ring rests against the valve piston. The term "lip seal" is understood to mean any seal which is inherently flexible and tilts from one end position into another according to the hydrostatic or pneumatic pressure acting upon it. The valve piston is flat in the section cooperating with the lip seal. It does not comprise a sealing ring in this section. A rotation of the control knob results in a rotation of the spindle, which is converted via the thread into an axial movement of the valve piston. When the upper valve part is opened, the valve piston moves away from the lip seal until the latter is released from the valve piston: The uppe
REFERENCES:
patent: 1910994 (1933-05-01), Joyce
patent: 3420493 (1969-01-01), Kraft
patent: 3454032 (1969-07-01), Hinz et al.
Lange Peter
Ziebach Helmut
Chambers A. Michael
Fluhs Drehtechnik GmbH
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