Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1994-01-21
1996-12-03
Walton, George L.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
1374545, 251266, 251267, 251268, 251359, 251364, F16K 2500, F16K 3150
Patent
active
055800319
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a stop valve more particularly constructed as a valve top for use in sanitary fittings.
A valve top for sanitary fittings is already known (DE-OS 27 37 839), in which an axially movable closing body provided with a rubber-like packing or gasket, is movable towards an annular valve seat body. An operator can turn the actuating member until he thinks that the valve is closed. He can therefore give rise to inadmissibly high pressures, which lead to premature valve wear.
A stop valve is also known (German patent 29 38 315), in which the sealing body has a rubber disk fixed between two metal parts, the sealing body cooperating with a conical valve seat. On excessively tightening the valve metal parts engage with one another, so that there is no overstressing of the rubber disk. However, the valve has a very complicated and costly construction.
In addition, a stop and regulating valve is known (German patent 24 28 242), in which the sealing member located at one end of a spindle has an elastic packing positioned between two disks. The valve seat is also conical. Actuation is limited in that the metallic front face of the actuating member engages with the metallic valve seat. As the front face only engages linearly on the conical valve seat, the latter can be damaged.
The problem of the invention is to provide a stop valve, particularly for use in sanitary fittings, which is in the form of a valve top, which can be simply constructed from a few operating parts and is subject to limited wear.
With the stop valve proposed by the invention it is possible with simple means for the forces acting on the valve seat to be limited, so that the valve is subject to limited wear and consequently has a long life. The resilience of the valve seat compared with the closing body cooperating therewith for closing the valve ensures that the surface pressure remains low.
According to a further development of the invention the valve seat has a rubber-elastic material sleeve on which acts a spring. This sleeve forms in the vicinity of its front face facing the closing body the sealing face for the valve seat. Advantageously the sleeve is held in its position facing the closing body by a stop member engaging thereon. According to the invention the stop member can act on the actuating member.
The invention proposes that the movement path of the closing body limited by the stop member is made such that the movement path extends somewhat further than up to the closing body-side end position of the valve seat. Thus, when the valve is in the closed position an engagement of the closing body on the valve seat always takes place under the action of the latter and can in particular be provided by a spring, which engages on the valve seat and/or the sleeve.
In the case of the valve proposed by the invention the closing body is part of the actuating member, i.e. is constructed in one piece therewith. However, it is also advantageously possible according to the invention for the closing body to be a component separate from the actuating member. It is therefore possible to make the closing body from less expensive material, e.g. to injection mould it in one piece from plastic. The mechanical movement and guidance of the closing body can then be carried out by metallic components.
The invention proposes that the actuating member be constructed as a rotary spindle. It can be a conventional rotary spindle in which, due to a thread engagement during each rotation, simultaneously a longitudinal movement also takes place. However, it is also possible to form the actuating member by an axially, non-moving rotary element.
As proposed by the invention, the closing body need only be guided in axially movable manner, so that there is no rotation during a longitudinal movement. Thus, in the case of engagement between the closing body and the valve seat, there is then no relative movement in the circumferential direction, which can contribute to an increased life.
It is also possible to allow a relative movement in the ci
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Hans Grohe GmbH & Co. KG
Walton George L.
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