A diaphragm valve assembly, comprising: a body defining a valve chamber, a first passageway through the body, and a second passageway through the body, wherein the first and second passageways serve as an inlet and an outlet for the valve chamber;Forged Steel Valves a removable valve seat installed in the valve chamber around one of the passageways; a seat holding means for holding the valve seat in place in the valve chamber, the seat holding means comprising a seat holder that is shaped to surround the valve seat; a flexibly resilient diaphragm having a valve closing portion and means for holding the diaphragm in position in the valve chamber, such that the valve closing portion is disposed juxtaposed the valve seat, the diaphragm being shaped such that, when fitted, the valve closing portion is spaced from the valve seat; and a selectively operable driving means for driving the valve closing portion of the diaphragm into contact with the valve seat for closing the valve; wherein the body further comprises a protruding rim portion around the one of the passageways,BALANCING VALVES wherein the rim portion and the seat holder define a recess adapted to receive the valve seat such that the valve seat is held between the seat holder and the rim portion; wherein the body defines a floor surface within the valve chamber,Bellow Seal Valve the floor surface comprising a seat supporting surface around the rim portion, the seat supporting surface being adapted to contact and support the valve seat; wherein the floor surface is recessed around the seat supporting surface to form a seat holder channel adapted to receive the seat holder; and wherein the seat holder channel for receiving the seat holder is formed deeper into the body of the diaphragm valve than the seat supporting surface

of the seat base for receiving the valve seat therein.

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