A fluid regulating device, comprising: a regulator valve having an inlet, an outlet, and a valve port disposed between the inlet and the outlet; an actuator coupled to the regulator valve and comprising a valve disc, the valve disc disposed within the regulator valve and adapted for displacement along a longitudinal axis between a closed position sealingly engaging the valve port and an open position disposed away from the valve port, the valve disc having a first end and a second end, wherein the first end is longitudinally opposite the second end; the valve disc including: a sealing surface disposed at the first end of the valve disc and adjacent to an outer radial end of the valve disc, the sealing surface adapted to sealingly engage the valve port in the closed position; an intermediate surface (30, 30') disposed radially inward of the sealing surface; and one or more disc passages longitudinally extending through the valve disc from the first end to the second end: characterised by: a groove formed in the intermediate surface (30, 30'), the groove extending along a groove axis extending along the intermediate surface (30, 30') normal to the longitudinal axis, the groove axis being at least partially curved when viewed along the longitudinal axis, wherein said one or more disc passages each comprises a first end disposed adjacent to the first end of the valve disc, and wherein the or each first end of the one or more disc passages is radially disposed between the sealing surface and the groove. a regulator valve having an inlet, an outlet, and a valve port disposed between the inlet and the outlet; an actuator coupled to the regulator valve and comprising a valve disc, the valve disc disposed within the regulator valve and adapted for displacement along a longitudinal axis between a closed position sealingly engaging the valve port and an open position disposed away from the valve port, the valve disc having a first end and a second end, wherein the first end is longitudinally opposite the second end; the valve disc including: a sealing surface disposed at the first end of the valve disc and adjacent to an outer radial end of the valve disc, the sealing surface adapted to sealingly engage the valve port in the closed position; an intermediate surface (30, 30') disposed radially inward of the sealing surface; and one or more disc passages longitudinally extending through the valve disc from the first end to the second end: characterised by: a groove formed in the intermediate surface (30, 30'), the groove extending along a groove axis extending along the intermediate surface (30, 30') normal to the longitudinal axis, the groove axis being at least partially curved when viewed along the longitudinal axis, wherein said one or more disc passages each comprises a first end disposed adjacent to the first end of the valve disc, and wherein the or each first end of the one or more disc passages is radially disposed between the sealing surface and the groove. a sealing surface disposed at the first end of the valve disc and adjacent to an outer radial end of the valve disc, the sealing surface adapted to sealingly engage the valve port in the closed position; an intermediate surface (30, 30') disposed radially inward of the sealing surface; and one or more disc passages longitudinally extending through the valve disc from the first end to the second end: characterised by: a groove formed in the intermediate surface (30, 30'), the groove extending along a groove axis extending along the intermediate surface (30, 30') normal to the longitudinal axis, the groove axis being at least partially curved when viewed along the longitudinal axis, wherein said one or more disc passages each comprises a first end disposed adjacent to the first end of the valve disc, and wherein the or each first end of the one or more disc passages is radially disposed between the sealing surface and the groove.