Manual control valve (for flow control)
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Those who are familiar with flow control valves, please explain the principle of manual control valves (used for flow control) as well as how to select them. Thank you for your reply.
A conical valve stem and a hole in the valve seat; as the stem moves up and down, the change in the cross-sectional area of the hole leads to changes in the flow capacity, and this is what is known as a control valve. It is generally called a needle valve. OP, you can communicate via private message for further details
I wonder how your manual adjustment reflects the flow rate after such adjustment?