How is the air flow in a pneumatic needle valve controlled?

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Multiple Choice

How is the air flow in a pneumatic needle valve controlled?

Explanation:
Flow is controlled by throttling the air with the needle’s position in its seat. Turning the adjustment screw moves the needle toward or away from the seat, changing the tiny opening and thus the flow rate with fine precision. The spring provides a restoring force to set a stable position, but it doesn’t determine the flow—the needle’s placement does. The main body size is fixed, and the outlet nozzle is simply the exit path; it doesn’t regulate flow by itself.

Flow is controlled by throttling the air with the needle’s position in its seat. Turning the adjustment screw moves the needle toward or away from the seat, changing the tiny opening and thus the flow rate with fine precision. The spring provides a restoring force to set a stable position, but it doesn’t determine the flow—the needle’s placement does. The main body size is fixed, and the outlet nozzle is simply the exit path; it doesn’t regulate flow by itself.

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