Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing
Patent
1997-10-10
1999-10-12
Walton, George L.
Fluid handling
With cleaner, lubrication added to fluid or liquid sealing...
Cleaning or steam sterilizing
15140061, 1510416, 251 63, B08B 904, F16K 5100
Patent
active
059642432
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a valve and in particular it relates to a valve which is to be used in installations where there is a likelihood of sedimentation or scaling in the region of the flow path which is to be controlled by the valve.
The valve has a particular application to installations where liquors are stored in vats or reservoirs which are associated with a drain provided with a valve. In many cases, while the liquor is maintained at a particular condition such as above a predetermined temperature, at which there is usually no precipitation or sedimentation. However, sedimentation can occur at critical times and when the conditions such as temperature vary and this can be particularly prevalent in the region of a drain which is generally associated with a well formed in the wall of the vat or reservoir. As a result of the well the liquor contained in the well is subject to cooling and often is stagnant. As a result precipitation or sedimentation will occur in the region of the drain, and it is often the situation that when the drain valve is opened, the build up of deposits in the region of the drain aperture can result in a blockage which prevents an adequate flow of liquor from the drain. It then becomes necessary to attempt to clear the aperture from the surface of the liquor or through the open valve by some external tool or the like. Such an arrangement is not only difficult but can be extremely hazardous to the personnel and can result in damage to the vat, and drain.
Some arrangements have been proposed in the past to provide means in association with valves which can be used to clear a fluid pathway upstream from a valve in order to ensure a flow of fluid on the valve being opened. Examples of these arrangements are disclosed in U.S. Pat. No. 1,467,492, U.S. Pat. No. 2,530,433, U.S. Pat. No. 3,211,422, U.S. Pat. No. 4,391,289 and U.S. Pat. No. 4,192,342. A difficulty with many of these prior art devices however is the dependent nature of the clearing action with the movement of the valve member towards and away from the valve seat. In addition it is necessary to ensure that once the valve is opened that sufficient clearance exists for any particles of solid material that have been created prior to the opening of the valve by the clearing action and/or which are in the region of the opening prior to opening will be able to pass through the opened valve without obstructing the flow through the valve. It is also desirable that the clearing means be able to move past the valve seat and into the volume associated with the valve in order to be able to penetrate any layer of sediment that has built up over the outlet and to provide an opening through the layer of sediment or scale.
It is an object of this invention to provide a valve which can be utilised in circumstances where sedimentation or scaling can occur which can otherwise limit an adequate fluid flow through the valve, when open.
Accordingly, the invention resides in a valve comprising a body adapted to be associated with an opening in the wall of a fluid reservoir or flowline, to provide a flow path, from an inlet at said opening, to an outlet, a valve seat located across the flow path at the inlet, a valve member movably supported from the body to be movable between a closed position at which it is sealing engagement with the valve seat and an open position at which it is spaced from the valve seat, an elongate clearing element which is slidably supported from the valve member, said clearing member having an outer end which is movable towards and away from the valve member between an extended position at which it extends from the valve member through the valve seat beyond the opening and a retracted position closely adjacent the valve member, a drive means to cause movement of the valve member between the open and closed positions and to cause movement of the clearing member between the extended and retracted positions.
According to a preferred feature of the invention the clearing element is movable with the valve member on movement
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The Original Ram Type Drain Valve, 6 pages (no date).
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