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 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 , the groove extending along a groove axis extending along the intermediate surface 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 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 , the groove extending along a groove axis extending along the intermediate surface 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 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 , the groove extending along a groove axis extending along the intermediate surface 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 . <EOS>