Overview of Primary Product

VBN THREADED CONTROL BALL VALVES AND ACTUATORS
63-4378—08 14
Application Notes
IMPORTANT
Valve sizing is important for correct system operation.
Undersized valves do not have sufficient capacity at
maximum load. Oversized valves do not have sufficient
authority over the load in modulating applications.
Oversized valves can cause excessive cycling and the
seat and ball can be damaged because of the restricted
opening.
Proper Use
These valves are only for use in cold, warm, and hot water
systems. Not suitable for oil, combustible gases, or steam.
They are designed for a medium temperature range of from
35 to 250°F, at a maximum pressure of 360 psig VBN
valves are to be operated with the appropriate Honeywell
direct coupled actuators only.
Water should be properly filtered, treated and conditioned
according to local conditions and the recommendations of
the boiler or chiller manufacturers. The installation of a
strainers and filters is recommended.
IMPORTANT
The presence of excessive iron oxide (red rust) in
the system voids the valve warranty.
Required Operating Torque
Both Honeywell non-spring return MVN and spring return
low torque direct coupled actuators can be utilized with the
VBN2 and VBN3 valves. VB valves use a patented seat
design that reduces the torque needed from the actuator.
Table 12. Close-off, Differential Pressure Ratings.
Flow Characteristics, Fig. 8, 9
The VBN2 Two-Way Ball Valves have:
• an equal percentage flow characteristic with
characterized flow control insert.
• a linear flow characteristic with full port balls.
The VBN3 Three-Way Ball Valves have:
• between ports A and AB: an equal percentage flow
characteristic.
• between ports B and AB: a linear flow characteristic at
20% reduced C
v
.
Fig. 8. Typical characterized VBN2 flow.
Fig. 9. Typical characterized VBN3 flow.
Fig. 10. Pressure derating curve.
The valve body is rated for WOG (water, oil, and gas), but
the valve with its internal components are only rated for
water and not for oil or gas.
Valve
Type Valve Size (in.)
Close-off
Pressure Rating
(psid)
2-way 1/2, 3/4 130
1, 1-1/4, 1-1/2, 2, 2-1/2, 3 100
3-way 1/2, 3/4, 1 50
1-1/4, 1-1/2, 2, 2-1/2 40
NOTE: 3-way close-off ratings apply to 3-way valves
with the B port plugged
0%
20%
40%
60%
80%
100%
0° 30° 60° 90°
VALVE STEM STROKE
FLOW
2-WAY
CHARACTERIZED
FLOW
FULL PORT
FLOW
M29551
0%
20%
40%
60%
80%
100%
0° 30°
60°
90°
VALVE STEM STROKE
FLOW
2-WAY AND 3-WAY
CHARACTERIZED
A PORT FLOW
3-WAY VALVE
B PORT FLOW
TOTAL COIL + BYPASS FLOW
M29525
600 WOG PRESSURE/TEMPERATURE CHART
0
100
200
300
400
500
600
700
0
TEMPERATURE (F)
PRESSURE
(PSI)
M29530
100 200 300
400