Control valve

A control valve comprising:

• a valve body having a fluid inlet, a fluid outlet, and an inner cavity between the fluid inlet and the fluid outlet;
• a flow rate presetting assembly including:
• an adjusting rod having a first end projecting from the valve body and a second end extending into the inner cavity, the adjusting rod rotating around an axis;
• a control component disposed at a bottom side of the valve body and rotating around the axis, and connected in a shape-fitted manner to the first end of the adjusting rod to rotate the adjusting rod;
• and
• an adjusting component disposed in the inner cavity and fixedly connected to the adjusting rod, the adjusting component rotating between a first position and a second position under the driving action of the adjusting rod to set a maximum degree of opening of the control valve;
• an indicator on a surface of the control component, wherein a deviation of the indicator relative to a reference position indicates a maximum flow rate corresponding to a position of the adjusting component, the reference position fixed relative to the valve body;
• and
• a locking member disposed at the control component, the locking member switching between a free position allowing rotation of the control component relative to the valve body and a locked position preventing rotation of the control component relative to the valve body
• wherein the free position and the locked position of the locking member are distributed in a radial direction perpendicular to the axis.