Fully Open

• Which of the variables can be controlled, to modify the relative forces and thus the state of the control valve?

Answer: P3

Fully Open

P1 x A1 > P3(0) x A2

P2 = P1 - P

P3 = 0

Q= working flow

P1 P2

A1

A2

P3

Fully Open

F1 = A1 x P1

P1 P2

A1

F1= Net Force for Opening

A = D / 4 2r = DD / 4 = D x HThus for unrestrictedflow H = D1/4

How Open is Open?Η

HH

H

2r = D

Control Valve Basic Patterns

• Y-Pattern

• Globe

• Saunders

• Angle

• In-Line