Patent ID: 8146884

Claim:
A control valve comprising: a first flow channel and a second flow channel; a valve chamber through which the first flow channel is in a flow connection with the second flow channel; and a closing member which is arranged in the valve chamber and from which a shaft extends for turning the closing member about a rotation axis in the valve chamber to constrict the flow connection between the first flow channel and the second flow channel, wherein the flow connection in the valve chamber is implemented so that, on a first plane cutting the rotation axis perpendicularly the closing member and the valve chamber comprise at least one adjustable inlet opening for establishing a flow connection between the first flow channel and an inner part of the valve chamber, and, on a second plane cutting the rotation axis perpendicularly and arranged at a distance from the first plane in the direction of the rotation axis, at least one discharge opening for establishing a flow connection between an inner part of the valve chamber and the second flow channel, the at least one adjustable inlet opening is arranged to reduce a force at which the closing member is pressed towards the valve chamber during the flow, the closing member is designed to, when in a closed position, be sealingly pressed towards the at least one discharge opening of the valve chamber, and the flow connection comprises a flow connection into the valve chamber and a flow connection out of the valve chamber that are constricted at all the openings when the closing member is turned about the rotation axis in the valve chamber.