Patent ID: 8826933

Claim:
A control assembly for regulating the flow of a fluid through a fluid flow-path of a regulator, the control assembly comprising: a hollow control member moveable between an open position and a closed position; a seat ring disposed outside of the hollow control member and adapted to be engaged by the control member when the control member occupies the closed position to prevent the flow of fluid through the fluid flow-path; a diaphragm subassembly connected to the control member and including a diaphragm, the diaphragm extending radially outward from the control member and adapted to respond to pressure changes on opposing sides thereof for moving the control member when installed within a regulator; a central rod extending at least partly through and concentric with the hollow control member and adapted to be disposed through a casing of the regulator; a first spring seat removably disposed in the hollow control member and defining an opening receiving the central rod, the first spring seat fixed relative to and disposed concentric with the central rod; a second spring seat removably disposed in the hollow control member and defining an opening receiving the central rod, the second spring seat being fixed relative to the control member and disposed concentric with the central rod, wherein the first spring seat and the second spring seat are each removably disposed on the central rod; and a spring disposed in the hollow control member and being disposed between the first and second spring seats, the spring biasing the control member away from the seat ring and into the open position.