A valve particularly suited for use with corrosive fluids having a housing formed with a fluid passage, and provided therewithin with a valve plug and seat, and with complete passage liner parts, consisting of corrosion-proof material; and wherein also the sealing between said housing and the passage liner parts is at as few sealing points as possible. The valve plug, or flow passage closing or locking member or piece, is firmly connected with, or fixedly positioned within, the valve housing.WATER POWER CONTROL VALVE The valve seat is a primarily ring-shaped member forming part of the valve flow passage, and mounted for shifting relative to said plug between flexible bellows members integrally connected at the ring sides, and further parts of the flow passage liner.Water Power Control Valves Outwardly of said flexible or folded bellows the fluid passage liner comprises tubular end pieces or sleeves integrally joined or one-piece joined to said bellows at their sleeve inner ends, and which sleeves are at their outer ends firmly connected or sealed to said housing by simple packings. Whereas the mentioned fluid passage forming parts may be fabricated of metal, they preferably, under the invention, consist of corrosion-proof plastic, in particular, polytetrafluoroethylene, or polytetrafluoroethylene reinforced with embedded fillers.

By the reverse from the usual use under the invention of a fixed valve plug and moveable valve seat, the prior, moveable valve stem, requiring to be guided through the housing with packings, is dispensed with. Also eliminated by the one piece seat ring, bellows, and end sleeve construction, are all sealing points inside the valve; Water Control valves the only sealing points required are outside the flow passage between the two end pieces and the valve housing.

In the preferred embodiment hereof, for controlling the valve, or more particularly the moveable valve seat, there is provided a guide piece or sleeve externally connected or keyed to the valve seat, and provided with means whereby the guide sleeve and through it the valve seat may be positioned by an external actuator.

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2011-12-23

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