Patent ID: 8156958

Claim:
A fluid regulating device, comprising: a valve body defining an inlet, an outlet, and a throat disposed between the inlet and the outlet; an actuator coupled to the valve body and comprising a valve disc and a diaphragm operably coupled to the valve disc, the valve disc disposed in the valve body and adapted for displacement between an open position and a closed position relative to the throat of the valve body in response to changes in pressure at the outlet of the valve body sensed by the diaphragm; a selected valve port disposed within the throat of the valve body, the selected valve port comprising a generally cylindrical member including a valve seat that is sealingly engaged by the valve disc when the valve disc is in the closed position, and an elongated orifice providing a flow path for fluid to pass through the selected valve port; a seat height that comprises a distance that the valve seat extends along the elongated orifice; and an orifice diameter that comprises an internal diameter of the elongated orifice, the selected valve port being pre-selected from a plurality of valve ports, each of the plurality of valve ports comprising an elongated orifice having an orifice diameter, and a valve seat having a seat height, the seat heights of the plurality of valve ports varying in inverse proportion to the orifice diameters of the plurality of valve ports.