User Guide

ManualsBrandsBarber Colman ManualsFlanged Valves5" Cast Iron Flanged Mixing Valve (290 cv)

Application

VB-8303 series three-way valves control hot or chilled

water in heating or air conditioning systems. These

valves may be piped as mixing valves with 2 inlets ("A"

and "B") and one outlet ("AB") or as diverting valves

with one inlet ("AB") and two outlets ("A" and "B"). They

are used for two-position or proportional control

applications. Valve assemblies require an

electric/electronic or pneumatic actuator and valve

linkage that may be purchased separately or as part of

a complete factory valve assembly.

These valves will also operate satisfactorily as two-way

angle valves if either end (side) port is closed off.

Danger:

Do not use for combustible gas applications.

The VB-8303 series valves are not rated for

combustible gas applications, and if used in these

applications, gas leaks and explosions may result.

Caution:

Piping must always use the "AB" (bottom)

port as the common. Whether diverting or mixing, the

"AB" port is the common. Pipe accordingly.

Features

• Valve sizes 2-1/2" to 6".

• Excellent close-off capability up to 35 psi.

• Meets ANSI III 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 temperatures 20° to 281°F

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

Universal Three-Way

Mixing/Diverting Valves

General Instructions

VB-8303 Series

Typical of VB-8303-0-5-P

2-1/2” to 6”

Summary of content (16 pages)

PAGE 1
VB-8303 Series 2-1/2" to 6" 125 psi Flanged Universal Three-Way Mixing/Diverting Valves General Instructions Application VB-8303 series three-way valves control hot or chilled water in heating or air conditioning systems. These valves may be piped as mixing valves with 2 inlets ("A" and "B") and one outlet ("AB") or as diverting valves with one inlet ("AB") and two outlets ("A" and "B"). They are used for two-position or proportional control applications.
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-27383 TAC Pneumatic Products Catalog 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 Body Seat Stem Valve Materials Plug Packing Seat Ring ANSI Pressure Class (Figure-2) Allowable Control Media Temperature Close-off Pressurea Valve Size Cv Ratingb 80c 95d 2-1/2” 115e 110c 3” 120d 120e 4” 190f 5" 290f 6" 500f kvs Ratingb 69c 82d 99e 95c 104d 104e 164f 251f 433f Valve Body Series VB-8303-0-5-P Chilled or Hot Water Modified Linear (May Be Piped as Mixing or Diverting)
PAGE 4
Table-2 Typical Compatible Actuators and Linkages Actuator Series MA61-7200 MA61-7201 MA61-7203 MA41-7150 MA41-7151 MA41-7153 MA40-7170 MA40-7171 MA40-7173 MF-63103 MF-63123 MF-63123-211 MF-63123-411 MF41-6343 MF41-7153 MF40-7173 MF61-7203 MK-6811f MK-6911 with AK-42309-500g MS41-7153 MS40-7170 MS40-7171 MS40-7173 MS41-6340 MS41-6341 MS41-6343 MS61-7203 a b c d e f g h Control Signal Type Spring Return Two Position 120 Vac Two Position 230 Vac Two Position 24 Vac Two Position 120 Vac Two Position 230 Vac
PAGE 5
100% Percent Full Flow 90% 80% 70% "A" Port 60% "B" Port 50% 40% 30% 20% 10% 0% 0 10 20 Stem Down Figure-1 30 40 50 60 Percent Valve Stem Lift 70 80 90 100 Stem Up Typical Modified Linear Flow Characteristics Rangeability Rangeability is the ratio of rated flow to the minimum controllable flow through a valve. The nominal rangeability for VB-8303 series valves is greater than 100:1. Temperature/Pressure Ratings See Figure-2 for temperature and pressure ratings.
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”. Since the flow rate through the heat exchanger is usually specified, the only variable normally available in sizing a valve is the pressure drop.
PAGE 7
Table-4 Water Capacity in Gallons Per Minute for VB-8303 Seriesa Valve Body Part Number VB-8303-0-5-12 Differential Pressure (ΔP in psi) Cv Rating 1 2 3 4 5 6 7 8 9 10 15 20 25 30 35 80 80 113 139 160 179 196 212 226 240 253 310 358 400 438 473 95 95 134 165 190 212 233 251 269 285 300 368 425 475 520 562 115 115 163 199 230 257 282 304 325 345 364 445 514 575 630 680 110 110 156 191 220 246 269 291 311 330 348 426 492 550 602
PAGE 8
Table-5 Vapor Pressure of Water Table Vapor Pressure (psia) Water Temp. (°F) Vapor Pressure (psia) Water Temp. (°F) Vapor Pressure (psia) Water Temp. (°F) 0.12 90 0.70 140 2.89 190 9.34 0.18 100 0.95 150 3.72 200 11.53 110 1.28 160 4.74 210 14.12 120 1.69 170 5.99 220 17.19 2.22 180 7.51 230 20.78 Water Temp. (°F) Vapor Pressure (psia) 40 50 60 0.26 70 0.36 80 0.
PAGE 9
A B Flow Flow Note: A label on the side of the valve provides port identification Stem Position Flow B to AB Up A Port Closed A to AB AB Down Flow Figure-3 B Port Closed VB-8303 Piped as Mixing Valve A B Flow Flow Note: A label on the side of the valve provides port identification Stem Position Flow AB to B Up A Port Closed AB to A AB Down B Port Closed Flow Figure-4 Valve Body VB-8303 Piped as Diverting Valve Gasket* Companion Flange* *Not supplied with valve.
PAGE 10
Note: A label on the side of the valve provides port identification Valve A Valve Bypass B A B Coil AB AB Return Bypass Return Coil Supply Stem Position Flow Supply Stem Position Flow Up Through Coil Bypass Up Through Coil Down Through Coil Down Through Coil Bypass Figure-6 VB-8303 Typical Piping for Control of Heating or Cooling Coil Note: A label on the side of the valve provides port identification A B AB System Pump Bypass Supply Return Boiler Stem Position Flow Up T
PAGE 11
Coil Balancing Cock Secondary Pump Note: A label on the side of the valve provides port identification A From Other Zones B AB To Other Zones Balancing Cock Return Supply Figure-8 VB-8303 Typical Primary-Secondary Piping CHECKOUT 1. Make sure the valve stem operates smoothly before installing the valve linkage and the actuator. Initial breakaway force can be expected. 2. If the stem does not operate smoothly, it may indicate that the valve stem was bent by rough handling.
PAGE 12
MAINTENANCE & FIELD REPAIR Regular maintenance of the total system is recommended to assure sustained performance. See Figure-9 and Table-6 for maintenance kits and their part numbers.
PAGE 13
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 14
E D B C A Figure-11 Flange Dimensions Table-8 Flange Detail for American Standard 125 psi Cast Iron Pipe Flanges (Figure-11) Flanges Nominal Pipe Size 2-1/2” 3” 4” 5" 6" 14 Flange Diameter A 7” 7-1/2” 9” 10" 11" Flange Thickness B 11/16” 3/4” 15/16” 1" Drilling Diameter of Diameter of Bolt Holes Bolt Circle D C 5-1/2” 6” 3/4” 7-1/2” 8-1/2" 7/8" 9-1/2" © Copyright 2008 TAC All Rights Reserved.
PAGE 16
Copyright 2008, TAC All brand names, trademarks and registered trademarks are the property of their respective owners. Information contained within this document is subject to change without notice. F-27197-4 TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 www.tac.