Valve and closure member

A valve having an inlet and an outlet, and a closure member which is rotatably arranged in the valve to be moved between a fully closed position and a fully open position so as to control flow of a fluid from the inlet to the outlet of the valve;

• said closure member comprising:
• a flow inlet area and a flow outlet area;
• the flow inlet area comprising:
• an initial flow inlet area having at least one initial opening which is first subjected to fluid from the inlet of the valve when the closure member is rotated from the fully closed position towards an initial open position, and a main inlet flow area having at least one main opening which is subjected to fluid from the inlet after the at least one initial opening has been subjected to fluid and the closure member is rotated further from the initial open position towards the fully open position of the closure member;
• the flow outlet area comprising:
• an initial flow outlet area which is arranged to first discharge flow to the outlet of the valve when the closure member is rotated from the fully closed position towards the initial open position, and a main outlet flow area which is arranged to discharge flow when the closure member is rotated further from the initial open position towards the fully open position;
• at least one main flow channel extending from the main inlet flow area to the main flow outlet area allowing flow from the inlet of the valve through the closure member to the outlet of the valve;
• and at least one initial flow channel, different from the at least one main flow channel, having a helical shape, located within the closure member and extending closest to an outer periphery of the closure member for guiding flow from the initial flow inlet area to the initial flow outlet area.