Question

A control valve operates from 3-15 psi control signal. To have a 40 gal/min flow rate, express the signal input in psi if it is a linear valve from 0 to 90 gal/min.

• A. 6.8 psi
• B. 8.3 psi
• C. 7.6 psi
• D. 12.4 psi

Answer 1

The correct option is B 8.3 psi

The pressure signal at 40 gal/ min is
$P-3=\frac{40-0}{90-0}(15-3)$
$P-0.444(15-3)+3$
$P=8.33psi$