The virtue of the needle valve

The virtue of the needle valve is from the vernier effect of the ratio between the needle's length and its diameter, or the difference in diameter between needle and seat. A long travel axially (the control input) makes for a very small and precise change radially (affecting the resultant flow).
Needle valves may also be used in vacuum systems, when a precise control of gas flow is required, at low pressure,[1] such as when filling gas-filled vacuum tubes, gas lasers and similar devices.
Please make a selection from our High pressure needle valve in various materials or our range of rugged instrument manifold valves. They are suitable for isolation, bleeding, calibration, and testing of pressure instruments.