Manual

VGF FLANGED VALVES
63-2618 B.B. 12-04 www.honeywell.com
Automation and Control Solutions Honeywell International Honeywell Europe S.A. Honeywell Latin American
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Region
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SERVICE
General
Fig. 20 shows the valve in the fully open or fully flowing
position from the B port to the AB port. As the valve stem
moves downward, the flow from the B to AB ports decreases
and the flow from the A to AB ports increases. As the valve
stem moves upward, the flow from the B to AB ports increases
and the flow from the A to AB ports decreases.
For electric control, a spring return actuator returns the valve
to its normal position (open or closed to the A or the B port,
depending on the actuator selected) in the event of a power
failure. Non-spring return actuators hold the last commanded
position.
For pneumatic control, the actuator returns the valve to its
normal position (open or closed to the A or the B port,
depending on the actuator selected) in the event of a loss of
control air pressure.
For typical flow curves see Fig. 1 and 2.
Fig. 20. Three-way valve operation.
Fig. 21. Two-way valve operation.
A PORT
B PORT
AB PORT
AB PORT
B PORT
A PORT
M22410
MIXING VALVE
DIVERTING VALVE
A PORT
AB PORT
A PORT
AB PORT
M22616
PRESSURE-
BALANCED
VALVE
STANDARD
VALVE