Product Overview

Technical Data
2091
Fluid chilled, hot water, up to 60% glycol
Flow characteristic equal percentage
Controllable flow range 75°
Valve Size [mm] 2” [50]
Pipe connection NPT female ends
Housing Nickel-plated brass body
Ball stainless steel
Stem stainless steel
Stem seal EPDM (lubricated)
Seat PTFE
O-ring EPDM (lubricated)
Characterised disc stainless steel
Body Pressure Rating 400 psi
Close-off pressure ∆ps 200 psi
Cv 65
Weight 5.29 lb [2.4 kg]
Fluid Temp Range (water) 0...250°F [-18...120°C]
Leakage rate 0% for A – AB
Maintenance maintenance-free
Flow/Mounting Details
Application
This valve is typically used in air handling units on heating or cooling coils, and
fan coil unit heating or cooling coils. Some other common applications include
Unit Ventilators, VAV box re-heat coils and bypass loops. This valve is suitable
for use in a hydronic system with variable flow.
Suitable Actuators
Non-Spring Spring
B251 ARB(X) AFRB(X)
Dimensions (Inches [mm])
B
A
C
D
H2
E F
H1
ARB, ARX
A B C D E F H1
10.2”
[260]
4.9” [125] 7.7” [196] 6.0” [152] 1.7” [44] 1.2” [30]
Safety Notes
WARNING: For Belimo products sold in California: these products do or may
contain chemicals which are known to the State of California to cause cancer
and or birth defects or other reproductive harms. For more information see
www.p65warnings.ca.gov.
B251 Technical Data Sheet
Stainless Steel Ball and Stem
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 09/11/2019 - Subject to change. © Belimo Aircontrols (USA), Inc.