This invention relates to a valve, and more particularly a valve for use in controlling the flow of fluid or semi-fluid medium where the medium is very erosive and can also harden or set to foul the seating of a valve closure member on an associated valve seat.

The valve of the present invention has been developed particularly for use in the alumina industry, where the flow of alumina medium through a plant in to be controlled by opening and closing of the valve.

It is an object of the present invention to provide a valve which ensures maximum life of the valve as erosion occurs whereby the tolerance between the mating surfaces of the valve member and the associated valve seat varies, and for which compensation is required during prolonged use of the valve.

In accordance with the present invention there is envisaged a valve comprising a valve housing having a valve seat therein, a valve member moveable via a valve spindle between positions spaced from and seated on the valve seat, wherein said valve member is required to lap at least once on said valve seat to compensate for any variation of tolerance between said valve member and said valve seat resulting from build up of medium or erosion, WATER POWER CONTROL VALVEwherein said valve spindle extends outwardly of said valve housing and means are provided between the valve spindle outwardly of said housing and said valve housing itself to compensate for relative movement therebetween during said lapping action of said valve member on said valve seat.

Preferably at least two pillars are provided extending between said housing and an outer end of said valve spindle and parallel thereto, whilst a collar is provided surrounding said valve spindle in threadible engagement therewith and extending to, and surrounding, Water Control valves said pillars such as to be axially movable relative thereto, whilst compressible mans are provided between the underside of said collar and underlying abutment means on said pillars to provide said means to compensate for relative movement between said valve spindle and said valve body during said lapping action.

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2011-12-06

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