Detented selectable variable orifice

A valve arrangement comprising:

• a valve housing defining a flow passage and a cross-bore that extends across the flow passage, the cross-bore defining a central axis, the cross-bore having first and second opposite ends positioned on opposite sides of the flow passage;
• a valve member that mounts within the cross-bore and that is rotatable within the cross-bore about the central axis of the cross-bore, the valve member defining a flow-control opening for controlling flow through the flow passage across the cross-bore, the valve member being rotatable about the central axis to vary a cross-sectional area of the flow-control opening that is available for permitting flow through the flow passage, the valve member rotatable about the central axis between a plurality of detent positions, corresponding to different flow levels;
• a spring positioned adjacent the first end of the cross-bore for applying a biasing force to the valve member in an axial direction along the central axis such that the valve member is biased toward the second end of the cross-bore;
• and
• a detent arrangement that defines the detent positions, the detent arrangement including a ramp interface configured such that when a predetermined level of torque is applied to the valve member about the central axis the ramp interface converts the torque into sufficient axial force to overcome the biasing force applied by the spring causing the valve member to move along the central axis in a direction toward the first end of the cross-bore to allow the valve member to move from a first detent position to a second detent position, wherein at least one of the first detent position and the second detent position defines a partial flow-control opening.