Valves and valve actuation – Lost motion between actuator and valve – Overload release
Patent
1989-02-13
1991-10-29
Walton, George L.
Valves and valve actuation
Lost motion between actuator and valve
Overload release
1374545, 137613, 251229, 251267, 251272, 251276, 464 37, 464 41, F16D 702, F16K 3144
Patent
active
050609092
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention relates to a shut-off valve for fluids comprising a valve housing, a valve piston with valve cone arranged upstream of an associated valve seat, and a piston holder accommodating the valve piston and being axially adjustable in the valve housing by means of a spindle, with the axial motion of the spindle holder being converted to a radial motion when the valve piston reaches a stroke limit.
A corresponding shut-off valve is disclosed in EP-B-0 073 855. By the arrangement of the valve cone in relation to the valve seat and the provision of a slip clutch preventing the valve from overtightening either in the opening or the closing position, a highly functional shut-off valve particularly for sanitation fittings is available. A corresponding valve can also be made of plastic, entailing considerable advantages over metal valves with regard to production and wear.
OBJECT OF THE INVENTION
The object of the present invention is to develop a shut-off valve of the type mentioned at the outset such that simple design measures preclude any "overtightening" of the valve, and also to ensure that simple assembly is possible of the elements making up the valve. It should also be avoided that foreign bodies can flow through the valve, with backflow through the valve being prevented in particular. Finally, the possibility should also be created to install the shut-off valve in fittings with non-standard dimensions.
The object is substantially achieved by providing the piston holder with axial projections on the outer wall which slide axially in associated axial recesses in the inner wall of the valve housing or which are movable into respectively adjacent recesses when the stroke limit is reached in order to achieve the radial motion. The recesses provided on the outer wall of the piston holder are preferably of "yielding" design here, in order on the one hand to avoid unwelcome wear and tear without however straining the axial guideway, and on the other hand to ensure that the projections "jump" from recess to recess when the stroke limit is reached. The individual elements preferably comprise plastics such as polyacetates or polyamides, which have long service lives. As a result, the manufacturing costs of a valve in accordance with the invention can also be considerably reduced. There are also advantages as regards weight. In accordance with a further noteworthy embodiment of the invention, the piston holder is connected to the spindle or shaft by a retaining element which passes through a radial slot in the piston holder.
A proposal that is separately protected is that the port connecting a fluid-carrying fitting to the valve be closable by an element which is arranged coaxially to the valve piston and is axially movable, and which constitutes a non-return valve. Here, the element configured as a non-return valve is preferably movable underneath the valve seat and along the valve piston to make a sealing contact with a sector of the housing which in its turn accommodates the valve seat on the opposite side.
Also noteworthy is the separately inventive proposal for the valve cone to be mounted axially movable by a chamber of hollow cylinder type which in its turn abuts in sealing contact against a port provided inside the fitting. The advantage of this is that the valve seat itself does not have to extend in a tubular area of the fitting, which would involve a mutual adjustment of the dimensions.
Finally, the invention is distinguished in particular by the fact that length differences of the valve housing can be compensated by screwing a stop element preferably of cap nut type directly or indirectly onto the valve housing, where the axial movement of the stop element caused by the screw motion can be converted to an exclusively radial motion preferably depending on the torque to be applied for screwing. A slip clutch is therefore provided to ensure that no uncontrolled forces can affect the valve housing.
The claims contain further features which have separately inventive content per se
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patent: 1082988 (1913-12-01), Wolff
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patent: 3006361 (1961-10-01), Reinemann
patent: 4006787 (1977-02-01), Rumpp et al.
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patent: 4619437 (1986-10-01), Williams et al.
patent: 4738277 (1988-04-01), Thomas
patent: 4766641 (1988-08-01), Daglow
patent: 4778149 (1988-10-01), Pesovic et al.
Bierman Jordan B.
Walton George L.
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