User Guide

ManualsBrandsBarber Colman ManualsFlanged Valves3" Cast Iron Flanged Valve (85 cv)

Application

VB-8223 series single seat, stem up to close, two-way

valves control water from 20 to 281°F (-7 to 138°C) or

steam to 281°F (138°C) maximum in heating or air

conditioning systems. They are used for two-position or

proportional electric/electronic or pneumatic control of

hot water, chilled water, or low pressure steam. Valve

assemblies require an actuator and valve linkage that

may be purchased separately or as part of a complete

factory valve assembly.

Danger: Do not use for combustible gas applications.

The VB-8223 series valve packings are not rated for

combustible gas applications, and if used in these

applications, gas leaks and explosions may result.

Features

• Valve sizes 2-1/2" to 6".

• Excellent close-off capability up to 125 psi.

• Meets ANSI IV seat leakage specifications.

• 125 psig pressure rating per ANSI Standards

(B16.1–1993) for flanged cast iron bodies.

• Self-adjusting spring-loaded TFE/EPDM packing.

• Expanded operating temperature 20° to 281°F

VB-8223 Series

2-1/2" to 6" 125 psi Flanged

Stem Up Closed

Two-Way Valves

General Instructions

Typical of VB-8223-0-5-P

2-1/2" to 6"

Summary of content (12 pages)

PAGE 1
VB-8223 Series 2-1/2" to 6" 125 psi Flanged Stem Up Closed Two-Way Valves General Instructions Application VB-8223 series single seat, stem up to close, two-way valves control water from 20 to 281°F (-7 to 138°C) or steam to 281°F (138°C) maximum in heating or air conditioning systems. They are used for two-position or proportional electric/electronic or pneumatic control of hot water, chilled water, or low pressure steam.
PAGE 2
Applicable Literature F-Number Audience Purpose Vx-8xxx Series Selection Guide Provides features, specifications, mounting dimensions, and other criteria useful to the selection of Vx-8xxx series valves. F-25683 TAC Valve Products Catalog, F-27384 Provides a comprehensive listing of TAC component products, describing their features and specifications, and provides other reference material useful to their selection.
PAGE 3
SPECIFICATIONS Table-1 Specifications/Models Specifications Service Flow Characteristics (Figure-1) Sizes Type of End Fitting Valve Materials Body Seat Stem Plug Packing Seat Ring ANSI Pressure Class (Figure-2) Maximum Inlet Pressure, Steam Allowable Control Media Temperature Close-off Pressurea Allowable Differential Pressure for Steamb Valve Size Cv Ratingc 2-1/2” 56 3” 85 4” 145 5" 240 6" 370 kvs Ratingc 48 74 125 208 320 Valve Body Series VB-8223-0-5-P Chilled or Hot Water (up to 50% Glycol) and St
PAGE 4
Table-2 Typical Compatible Actuators and Linkages Required Valve Linkage Control Signal Type Spring Return 2-1/2” to 5" Valves 6" Valves Normal Position MA61-7200 Two Position 120 Vac Yes Nonea — Closed MA61-7201 Two Position 230 Vac Yes Nonea — Closed MA61-7203 Two Position 24 Vac Yes Nonea — Closed MA41-7150 Two Position 120 Vac Yes AV-607 AV-609 Closedb MA41-7151 Two Position 230 Vac Yes AV-607 AV-609 Closedb Actuator Series MA41-7153 Two Position 24 Vac Yes AV-607
PAGE 5
Flow Characteristics The flow curve shown in (Figure-1) is representative of all sizes. All valve plugs have lower gain when nearly closed to enhance control at low demand. Two-way valves are nominally equal percentage and normally used for water and low pressure steam.
PAGE 6
VALVE SIZING AND SELECTION Water Flow Coefficient (Cv) Sizing a valve requires selecting a flow coefficient (Cv), which is defined as the flow rate in gallons per minute (gpm) of 60°F water that will pass through the fully open valve with a 1 psi pressure drop (Δp). It is calculated according to the formulas shown in Cv Equation for Water and Cv Equation for Steam.
PAGE 7
gpm = Flow rate of water that will pass through fully open valve, measured in U.S. gallons per minute (60 °F (15.6 °C) water). ΔP = Differential pressure (pressure drop), measured in psi. Steam Two-position Two-position zone valves and direct radiation valves are normally sized using a minimum of 10% of inlet pressure (psig). Proportional Proportional control valves are normally sized using: • For low pressure (15 psig or less), use ΔP of 80% of gauge inlet pressure.
PAGE 8
Note: Add 14.7 psi to the gauge supply pressure to obtain the absolute pressure value. For example, if a valve is controlling 200°F water at an inlet pressure of 18 psig, the maximum pressure drop allowable would be: Pm = 0.5 [(18 + 14.7) – 11.53] = 10.6 psi (Vapor pressure of 200°F water is 11.53 psi.) Therefore, if the pressure drop for this valve is less than 10.6 psi, cavitation should not be a problem.
PAGE 9
Flanged Valve Bodies The VB-8223-0-5-P series flanged valve bodies conform to American Standard 125 psi Cast Iron Pipe Flanges. The companion flanges (not provided) should be the same specification as the valve. The 125 psi flanges have plain flat faces and should not be bolted to a raised faced flange. 1. All parts should be clean to assure tight seals. 2. The pipe with the companion flanges installed should be properly supported and aligned.
PAGE 10
MAINTENANCE & FIELD REPAIR Regular maintenance of the total system is recommended to assure sustained performance. See Figure-4 and Table-7 for maintenance kits and their part numbers. Kits 1, 2, and 6 Bracket Nut 2 Kit 6 Stem and Plug Assembly 3 Kit 1 and 6 Packing Cartridge Kit 2 3 Kits 4 and 6 Wiper "O" Ring Kits 5 and 6 Valve Seat Assembly 3 1 Kits 3, 5, and 6 Top Gasket 1 3 Note: Refer to accompanying table for kit part numbers.
PAGE 11
Water System Maintenance All heating and cooling systems are susceptible to valve and system problems caused by improper water treatment and system storage procedures. These guidelines are provided to help avoid valve and water system problems resulting from improperly treated water or storage procedures in cooling and hot water systems, and to obtain maximum life from TAC valves. Durability of valve stems and packings is dependent on maintaining non-damaging water conditions.
PAGE 12
E D B C A Figure-6 Flange Dimensions Table-9 Flange Detail for American Standard 125 psi Cast Iron Pipe Flanges (Figure-6) Flanges Nominal Pipe Size Drilling Flange Diameter A Flange Thickness B Diameter of Bolt Circle C 2-1/2” 7” 11/16” 5-1/2” 3” 7-1/2” 3/4” 6” 4” 9” 5" 10" 6" 11" 15/16” 1" Bolting Diameter of Bolt Holes D Number of Bolts 3/4” 4 Diameter of Bolts 5/8” 7-1/2” 8-1/2" 9-1/2" 7/8" 8 Length of Machine Bolts E 2-1/2” 3" 3/4" 3-1/4" On October 1st, 2009, TAC be