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Control Ball Butterfly
Threaded Flanged Resilient Seat
Attribute Specification
VBN3 VBF3 VFF3
VFF6
Pipe Size
1/2"
[DN15]
•
3/4" [DN20] •
1"
[DN25]
•
1 1/4" [DN32] •
1 1/2" [DN40] •
2" [DN50] • •
•
2 1/2"
[DN65]
• • •
3" [DN80] • •
4"
[DN100]
• • •
5" [DN125] • • •
6" [DN150] • • •
Other (maximum size) 20" [DN500]
Pipe Fittings
Sweat
NPT Internal Thread •
Inverted Flare
ANSI Flange • • •
Static Pressure
ANSI 125/150 •
ANSI 250/300
Other 360 psi 250 psi
Media
Chilled Water • • • •
Hot Water • • • •
Flow Capacity, Cv
Multiple ratings per pipe size • •
One rating/size above 1/2" • •
Valve Action
Mixing A-B-AB porting • • •
Mixing A-AB-B porting •
Diverting AB-B-A porting • o •
Diverting A-AB-B porting •
A-port Flow
Characteristic
Equal Percentage
Modified Equal Percentage • • • •
Linear
Quick Open
B-port Flow
Characteristic
Modified Equal Percentage • •
Linear
Linear, Reduced Cv • •
Total Constant Flow
Quick Open
Close-off
pressure***
High (60 psid minimum) • • •
Medium (30 psid minimum) • • •
Varies with actuator
Maximum
Seat
Leakage**
ANSI Class III (0.10% Cv max.)
ANSI Class IV (0.01% Cv max.) • A-port • •
Bubble-tight design • •
Other (see product data literature) B-port
Rangeability
High (50:1 minimum) • •
Medium* (15~50:1) o
Low (under 15:1) • •
Trim
Brass, plated brass, bronze •
Stainless Steel •
Resilient materials • •
In-line
Serviceability
Cartridge
Packing • •
Rebuild •
Actuation Options
Electronic Modulating • • • •
Tri-state floating • • • •
Pulse Width Modulation
2-position low voltage • • Limited
2-position line voltage o o • •
Electric Spring Return • • Limited
Electronic Fail Safe
Pneumatic, low pressure Limited
Pnuematic bidirectional (Hi-Pr) • •
Pnuematic spring return (Hi-Pr) • •
Notes * Best used with supply water reset from outdoor air temperature.
** A port specification
*** A-port maximum operating differential pressure. Static close-off pressure may be higher. Maximum pressure for quiet service may be less.
**** Stem down to close
***** Stem up to close
"Limited" = not available in large sizes
VALVE SELECTION
Control Valve Selection Criteria
3-Way