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Principle of Flow Control Valve

Flow characteristics of needle valve
KOFLOC needle valves are classified into the simplified type, preci-sion type, and large-capacity type.
Flow characteristics of needle valve

1

The needle used for respective valves comes in various types ac-cording to the flow.

2

The graph shown below summarizes the flow characteristics of representative KOFLOC needle valves.

There may be a slight difference when respective needle valves are actually used because of operating condition errors and instrument errors, as well as the characteristic
summarization based on differential pressure.

In the case of a gas, air is used as a representative for summarization; in the case of other gases, multiply the flow rate by

3

In the case of a liquid, water is used as a representative; in the case
of other liquids, multiply the flow rate by

4

When the viscosity is high, however, contact us for the specific coef-ficient of viscosity.

CAUTION -Precautions on use of needle valves-

Needle valves do not guarantee constant flow continuously.

Opening/closing of other valves, temperature changes, and impact will cause the flow rate to change.

Please determine the period to monitor and readjust the flow rate.

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