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The wedge gate valve shall be of cast iron completely encapsulated with rubber. The sealing rubber shall be permanently bonded to the cast iron wedge to meet ASTM tests for rubber metal bond ASTM D-249.
In a wedge gate valve, the seats are not parallel, but taper inward from top to bottom. The discs are also tapered. When the discs are forced into the seats, the wedging action provides the sealing force. That is effective for sealing, but one of the drawbacks of a wedge gate is the discs can get 'stuck' in the seat, especially if there is a great change in system temperature from when the valve is closed.
A wedge gate is smooth ,unobstructes waterway, so it has high flow characteristics, 100% smooth passage without turbulent flow , no sediment build-up,and will not impede travel of line leaning tools. As it has Only Three Internal Parts, it Virtually maintenance free. As a wedge gate has no seats rings,there is nothing to be damaged by scoring.
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