© 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. February, 2021 tc Document Number: F-27395-16 www.schneider-electric.com schneider-electric.com | 1 Selection Guide SpaceLogic VBB/VBS Ball Valve and Actuator Assemblies Application The SpaceLogic VBB and VBS Ball Valves and Actuators are 2-Way or 3-Way, 1/2” or 3/4”, characterized ball valves. The SpaceLogic M2 and M3 Actuators are direct coupled to the VBB/VBS Series valves and accept two-position, floating or proportional control signals from a DDC system, controller, or thermostat for control of hot or chilled water, or solutions of up to 60% glycol. Typical applications include VAV reheat, fan coil units, hot and chilled water coils in air handling units, heat pumps and unit ventilators. Features • Easy product selection — all actuators fit all valve bodies. • Fast, easy actuator installation — no linkage or tools required. • Flow characterizing insert provides equal percentage flow characteristic for stable, accurate floating and proportional control. • ANSI IV seat leakage (0.01%) for both 2-Way and 3-Way valves (A and B port). • Brass and stainless steel trim models. • Cvs from 0.3…10. • Normally open, normally closed, and non-spring return assemblies available. • Two-position, Floating or Proportional (0…5 Vdc, 0…10 Vdc, 5…10 Vdc, or 4…20 mA dc). • Proportional actuator is direct or reverse acting. • RoHS Compliant (VBS Assemblies). • Reach Compliant. Applicable Literature • SpaceLogic VBB/VBS Ball Valves with Two-Position Actuators Installation Instructions, F-27392. • SpaceLogic VBB/VBS Ball Valves with Floating Actuators Installation Instructions, F-27393. • SpaceLogic VBB/VBS Ball Valves with Proportional Actuators Installation Instructions, F-27394. • SpaceLogic VBB/VBS Ball Valves and Actuators Sales Brochure, F-27681. • EN-205 Water System Guidelines, F-26080. • EN-206 Guidelines for Powering Multiple Actuators, F-26363.2 | schneider-electric.comSelection Guide February, 2021 tc © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. Document Number: F-27395-16 Specifications Actuator Voltage24 Vac for floating and proportional 100…277 Vac for two position multi-voltage types Power Requirements See Table-1, Table-2, and Table-3. Control Signal2-Position, Floating, or Proportional; half wave rectified power supply Timing, Full Open to Full Close See Table-1, Table-2 and Table-3. Manual Operating Lever / Position Indicator Standard on all models. Auxiliary End Switch (optional) SPST 24 Vac/Vdc, 101 mA…5 A max. Noise Level M2 M3 Running M3 Spring Ret ≤ 45 dB(A) @ 1m ≤ 30 dB(A) @ 1m ≤ 45 dB(A) @ 1m MaterialsThermoplastic base and cover. Approved for use in air plenums. Shipping & Storage Temperature Limit -40…169 °F (-40…76°C). Operating Temperature Limit at max fluid temp. Floating32…140 °F (0…60 °C) Proportional32…140 °F (0…60 °C) Two-Position32…169 °F (0…76 °C) Humidity5…95% relative humidity, non-condensing. LocationsNEMA 2, IEC IP31. Indoor Use Only. Valve Service a Hot and chilled water, up…60% glycol. System Static Pressure Limit 600 psi (4137 kPa). Fluid Temperature Limit20…250°F (-7…121°C). Cv (Kv)See Tables 4 through 7. Close-off Pressure b 130 psi 2-Way; 70 psi 3-Way Differential Pressure30 psi normal operation 20 psi quiet operation. Seat MaterialPTFE Characterized InsertGlass-filled PEEK Seat LeakageANSI class IV (0.01%) at both A and B ports with pressure at inlet. End ConnectionsNPT threaded (VBxxNxx) RangeabilityGreater than 300:1. Body MaterialForged brass. Stem MaterialStainless steel anti-blow out stem with dual Viton™ o-rings. Ball MaterialChrome plated brass (VBB series) or stainless steel (VBS series). a. Not rated for steam service. b. Close-off is defined as the maximum allowable pressure drop to which a valve may be subjected while fully closed. Agency Listings M2 SpaceLogic actuators M3 SpaceLogic actuators: North America: c-UL-us LISTED per UL 873 and C22.2 No.24. European Union: LVD 2006/95/EC and EMC 2004/108/EC directives compliant. North America: c-UL-us LISTED per UL 60730-1 & -2-14 and CSA E60730-1 & -2-14. FCC part15 classB & ICES-003 classB emissions compliant. European Union: LVD 2014/35/EU and EMC 2014/30/EU directives, per EN 60730-1 & -2-14. EN 61000-6-2 immunity & EN 61000-6-3 emissions compliant. Australia This product meets requirements to bear the RCM Mark. Plenum RatingActuators with terminal block or plenum cable leads are plenum rated. CRN NumberCRN OC0970.9012345678NTY. RoHS Compliant VBS valves and M3/M2 actuators comply with European Directive RoHS 2 Directive 2011/65/EU. Please consult factory for part number specific compliance. REACh Compliant Compliant as defined in Article 33 of the REACh Regulation (EC)1907/2006. AAB Supply Return Typical Two-Way Fan Coil Application Supply Bypass Return B ABA Typical Three-Way Fan Coil Application Application Schematics Typical applications For simplicity, balancing valves and control devices are not shown. Mixing applications schneider-electric.com | 3 Selection Guide © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. February, 2021 tc Document Number: F-27395-16 Ball Valve Assembly Selection Procedure 1. Select the actuator. When selecting a ball valve assembly, you must know the control signal type and voltage to first select an actuator. Consult the following tables: Table-1 covers two-position actuator specifications and model numbers, Table-2 covers floating actuator specifications and model numbers and Table-3 covers proportional actuator specifications and model numbers. 2. Select the valve body. The valve body model number is selected based on the line size (1/2” or 3/4”), ball material trim, and flow coefficient (Cv/Kv) required. Consult Table-4 and Table-5 for brass trim valve body specifications and model numbers and Table-6 and Table-7 for stainless steel trim valve body specifications and model numbers. See “Flow Coefficient Selection” for information in determining the flow coefficient. Other considerations 1. General service conditions: Make sure the actuator is suitable for the anticipated ambient conditions and that the valve body is compatible with the system fluid temperature and pressure requirements. 2. Close-off pressure: Confirm that the VBB/VBS ball valve’s close off rating is suitable for the valve control application. 3. Space requirements: If mounting space limitations are a consideration, check the actuator/valve assembly dimensions. 4. Pipe reducers: Refer to Tables for estimating effective Cvs when using pipe reducers. 5. Ordering information. You may order the actuator and valve body separately or as a factory assembly. To order a complete valve and actuator assembly, specify the valve body part number and the actuator part number separated by a “+.” Example: To order actuator valve body VBB2N15 and M312A00 as a factory valve/actuator assembly, specify VBB2N15+M312A00. Flow Direction A notch cut into the stem indicator at the tip of the valve stem is an external indicator of where the closed portion of the ball sits internally. Check the notch position prior to assembling the actuator to verify the ball is orientated in the correct plane. Three-Way, A-Port Closed, B-Port Open Stem Indicator Ball Position AB A B Two-Way Closed Stem Indicator Ball Position or ABA Two-Way Open Stem Indicator Ball Position or AB A Three-Way, A-Port Open, B-Port Closed Stem Indicator Ball Position AB A B In the drawings below, the black mark on the stem indicator represents this stem notch. Stem Indicator Closed Open4 | schneider-electric.comSelection Guide February, 2021 tc © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. Document Number: F-27395-16 Product Selection: Actuators Table-1: Two-Position Actuators Part NumberControl Signal Power Loss Action (Valve Normal Position) VA / VoltageLeads Stroke Timing g Spring Return Timingg End Switch M210A00 Two- Position Normally Open 3.5/1.8 at 24 Vac/24 Vdc Removeable Terminal Block b 50 sec35 sec. M210A01 10 ft. (3.05 m) Plenum Cablec M210A11SPST M210A02 18 in. (45 cm) Appliance Wire M210A12SPST M210M02 6.0/6.0 at 100…277 Vac, 50/60 Hz 18 in. (45 cm) Appliance Wire M210M12SPST M220A00 Normally Closed 3.5/1.8 at 24 Vac/24 Vdc Removeable Terminal Block b M220A01 10 ft. (3.05 m) Plenum Cablec M220A11SPST M220A02 18 in. (45 cm) Appliance Wire M220A12SPST M220M02 6.0/6.0 at 100…277 Vac, 50/60 Hz M220M12SPST Table-2 Floating Actuators Part NumberControl Signal Power Loss Action (Valve Normal Position) VA @ 24 Vac 50/60 Hz Leads Stroke Time, sec. 50/60 Hz Time-out Delay, sec. 50/60 Hz M332A00 Floating (Non-Spring Return)2.3/2.4 Terminal Blockb 159/135181 Sec M332A0110 ft. (3.05 m) Plenum Cablec M312A00 Normally Open 3.2/3.3d Terminal Block b M312A0110 ft. (3.05 m) Plenum Cable c M322A00 Normally Closed Terminal Block b M322A0110 ft. (3.05 m) Plenum Cable c Table-3 Proportional Actuators Part NumberControl Signal Power Loss Action (Valve Normal Position) VA @ 24 Vac 50/60 Hz Leads Stroke Time, sec. 50/60 Hz Time-out Delay, sec. 50/60 Hz M333A00 Proportional a (Vdc : 0…5, 0…10, 2…10, 5…10, 4…20 mA dc e) (Non-Spring Return)2.7/2.8 Terminal Block b 159/135 200/166 M333A0110 ft. (3.05 m) Plenum Cablec 145 Sec M313A00 Normally Open 2.7/2.8 d Terminal Blockb M313A0110 ft. (3.05 m) Plenum Cable c M323A00 Normally Closed Terminal Block b M323A0110 ft. (3.05 m) Plenum Cable c a. Default configured for 0…10 Vdc input signal, direct acting control. b. All terminal block and appliance wire units accept a 1/2” conduit connector fitting (.875” diameter). c. All plenum cable units include an integral 3/8” conduit connector fitting. d. Size transformer for 10 VA per actuator. e. For 4…20 mA control, a separate isolated transformer must be used with each valve. g. Nominal.schneider-electric.com | 5 Selection Guide © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. February, 2021 tc Document Number: F-27395-16 Brass Trim Valves Table-4. 2-Way Brass Trim Valve Bodies End Connection: NPT Size Part Number Cv (Kv) 1/2” VBB2N000.3 (0.3) VBB2N010.7 (0.6) VBB2N021.2 (1.0) VBB2N032.1 (1.8) VBB2N043.5 (3.0) VBB2N054.7 (4.1) VBB2N067.7 (6.7) VBB2N07 b 10 (8.7) 3/4” VBB2N100.3 (0.3) VBB2N110.7 (0.6) VBB2N121.2 (1.0) VBB2N132.1 (1.8) VBB2N143.5 (3.0) VBB2N154.7 (4.1) VBB2N167.7 (6.7) VBB2N17 b 10 (8.7) b. Full Port Model without characterized disc. Table-5. 3-Way Brass Trim Valve Bodies End Connection: NPT SizePart Number Cv (Kv) A Port Cv (Kv) B Port 1/2” VBB3N000.3 (0.3)0.3 (0.3) VBB3N010.6 (0.5)0.8 (0.7) VBB3N021.0 (.85)0.8 (0.7) VBB3N032.0 (1.7)1.5 (1.3) VBB3N043.0 (2.6)1.5 (1.3) VBB3N054.5 (3.9)2.7 (2.3) VBB3N067.3 (6.3)4.1 (3.5) VBB3N07 b 10.0 (8.7)4.8 (4.1) 3/4” VBB3N100.3 (0.3)0.3 (0.3) VBB3N110.6 (0.5)0.8 (0.7) VBB3N121.0 (.85)0.8 (0.7) VBB3N132.0 (1.7)1.5 (1.3) VBB3N143.0 (2.6)1.5 (1.3) VBB3N154.5 (3.9)2.7 (2.3) VBB3N167.3 (6.3)4.1 (3.5) VBB3N17 b 10.0 (8.7)4.8 (4.1) b. Full Port Model without characterized disc. Application Note for 2 and 3-Way Valves SpaceLogic VBB/VBS Ball Valves are Characterized Control Ball Valves designed so that flow through the A-port exhibits equal percentage flow, thus the A-port is the control port. In a 3-way valve, the B-port is the bypass port and flow through the B-port is designed to be less than that of the A-port. In most applications, this reduced flow compensates for the pressure drop seen by the coil supplied by the A-port. Stainless Steel Trim Valves Table-6. 2-Way Stainless Steel Trim Valve Bodies End Connection: NPT Size Part Number Cv (Kv) 1/2” VBS2N000.3 (0.3) VBS2N010.7 (0.6) VBS2N021.2 (1.0) VBS2N032.1 (1.8) VBS2N043.5 (3.0) VBS2N054.7 (4.1) VBS2N067.7 (6.7) VBS2N07 b 10 (8.7) 3/4” VBS2N100.3 (0.3) VBS2N110.7 (0.6) VBS2N121.2 (1.0) VBS2N132.1 (1.8) VBS2N143.5 (3.0) VBS2N154.7 (4.1) VBS2N167.7 (6.7) VBS2N17 b 10 (8.7) b. Full Port Model without characterized disc. Table-7. 3-Way Stainless Steel Trim Valve Bodies End Connection: NPT SizePart Number Cv (Kv) A Port Cv (Kv) B Port 1/2” VBS3N000.3 (0.3)0.3 (0.3) VBS3N010.6 (0.5)0.8 (0.7) VBS3N021.0 (.85)0.8 (0.7) VBS3N032.0 (1.7)1.5 (1.3) VBS3N043.0 (2.6)1.5 (1.3) VBS3N054.5 (3.9)2.7 (2.3) VBS3N067.3 (6.3)4.1 (3.5) VBS3N07 b 10.0 (8.7)4.8 (4.1) 3/4” VBS3N100.3 (0.3)0.3 (0.3) VBS3N110.6 (0.5)0.8 (0.7) VBS3N121.0 (.85)0.8 (0.7) VBS3N132.0 (1.7)1.5 (1.3) VBS3N143.0 (2.6)1.5 (1.3) VBS3N154.5 (3.9)2.7 (2.3) VBS3N167.3 (6.3)4.1 (3.5) VBS3N17 b 10.0 (8.7)4.8 (4.1) b. Full Port Model without characterized disc.6 | schneider-electric.comSelection Guide February, 2021 tc © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. Document Number: F-27395-16 Application Notes The SpaceLogic VBB/VBS Ball Valves and actuator assemblies are designed to make incremental adjustments to flow based on the control signal input. The actuators are not intended for continuous use in zero dead band control systems. Two-Position Spring Return SpaceLogic Actuators When powered, the actuator moves to the desired position, winding the spring return system. When power is removed, the spring returns the actuator to the normal position. Two-position spring return actuators can be purchased with an optional built-in auxiliary SPST end switch for interfacing or signaling; for example, zone pump burner control. Floating/Proportional Spring Return SpaceLogic Actuators When power is applied to the actuator, there is a 3-second delay before the solenoid latches and the gear train is engaged. Upon power loss, the solenoid releases after 2 seconds, allowing the actuator to spring return to normal position. This prevents the loss of valve position during brief outages. The spring return feature should not be used for routine, normal operation. Proportional Spring Return and Non-Spring Return SpaceLogic Actuators The control signal input and action is selected by means of the input signal dip switch on the actuator circuit board. All actuators are shipped with the input signal dip switch (SW1) set to ON for a 0…10 Vdc control signal and the remaing dip switches and the control action dip switch set to OFF for direct action (DA; valves opens with increasing control signal, as shown). When using a 4…20 mA dc control signal, a separate isolation transformer must be used with each actuator. When using switches 1-4, the lowest numbered dip switch set to ON takes priority, e.g. if both SW2 and SW4 are on, SW2 takes precedent. SW1 through SW4 must be OFF (and SW5 ON) for 4-20 mA mode. For more information see Guidelines for Powering Multiple Actuators EN-206 (F-26363). Multiple actuators may be connected to a single controller. Do not exceed the maximum current draw of the controller or transformer. Proportional Actuators perform a self-calibration cycle on power-up. The actuator will run to the open direction for approximately 20 seconds and then to the closed direction for approximately 2 ½ min (60 Hz) or 3 ½ min (50Hz). See Table-2 for exact timing. Once this cycle is complete, the actuator will then accept and respond to the control signal. Do not use manual positioning while power is applied to the actuator. Manual positioning of the actuator while power is applied is NOT recommended. If the actuator is manually positioned while power is applied, the calibration cycle will need to be completed again for the actuator to function properly. To recalibrate the actuator, cycle power off for more than 6 seconds. Floating Spring Return and Non-Spring Return SpaceLogic Actuators Spring Return and Non-Spring Return actuators with time-out will automatically limit the running time of the actuator. The time- out feature automatically cuts off the control signal to the valve after three minutes (see Table-1) of continuous operation. Upon change in control signal direction, the actuator will resume operation. The controller or thermostat used to operate the Non- Spring Return Floating actuator without timeout must be configured to turn off the control signal after being continuously on for three minutes. Multiple actuators may be connected to a single controller. Do not exceed the maximum current draw of the controller or transformer. Power/Failure Action Control SignalPosition upon loss of power Non-Spring Return ActuatorSpring Return Open Actuator - Fail Open Spring Return Closed Actuator - Fail Closed FloatingPower to "Open" terminal will open A to ABMaintain last positionWill spring A to AB openWill spring A to AB closed Proportional DA Dip Switch selected (SW6 OFF)- Increase in control signal will open A to AB Maintain last positionWill spring A to AB openWill spring A to AB closed RA Dip Switch selected (SW6 ON)- increase in control signal will close A to AB Maintain last positionWill spring A to AB openWill spring A to AB closed 2-Position Control SignalSpring Return Open ActuatorSpring Return Closed Actuator Power OnA to AB ClosedA to AB Open Power OffA to AB OpenA to AB Closed Note: 2-Way valve operation described. For a 3-Way valve, A to AB operation is the same. B to AB operation is opposite that of A to AB operation. 123456 0-10V Direct Actingschneider-electric.com | 7 Selection Guide © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. February, 2021 tc Document Number: F-27395-16 5-1/8 (130) 4-3/8 (111) 1/16 (2) 2-3/8 (60) 3-3/4 (95) 1-3/8 (35) 1-3/8 (35) 2-9/16 (65) 3/4 (19) 2-1/2 (64) 1-11/16 (43) 3/8 (10) 2 (50) 5-1/8 (130) 4-3/8 (111) 2-3/8 (60) 3-3/4 (95) 3/4 (19) 2-9/16 (65) 1-3/8 (35) 1-3/8 (35) 1/16 (2) 1-11/16 (43) 2-1/2 (64) 2-3/16 (56) 5-1/8 (130) 4-3/8 (111) 1/2 (12) 3-9/16 (90) 4-7/8 (124) 3/4 (19) 1-3/8 (35) 1-3/8 (35) 2-9/16 (65) 2 (50) 2-1/2 (64) 1-11/16 (43) 3/8 (10) 5-1/8 (130) 4-3/8 (111) 1/2 (12) 3-1/16 (78) 4-7/8 (124) 2-9/16 (65) 1-3/8 (35) 1-3/8 (35) 1-11/16 (43) 2-1/2 (64) 2-3/16 (56) Dimensions 1-3/8 (35) 1-3/8 (35) 1-11/16 (43) 1/2 (12) 3-1/16 (78) 4-7/8 (124) 5-1/8 (130) 4-3/8 (111) 2-3/16 (56) 2-9/16 (65) 2-1/2 (64) 2-Way Floating/Proportional Non-Spring Return Assembly Shipping Weight: 2.2 lbs (998 g)3-Way Floating/Proportional Non-Spring Return Assembly Shipping Weight: 2.4 lbs (1089 g) 2-Way Spring Return Floating/Proportional Spring Return Assembly Shipping Weight: 2.4 lbs (1089 g) All dimensions shown are rounded to the nearest 1/16”. An additional 1” is required above the valve to remove the actuator from the valve. 3-WayFloating/Proportional Spring Return Assembly Shipping Weight: 2.6 lbs (1180 g) 2-Way Spring Return Two Position Assembly Shipping Weight: 2.8 lbs (1270 g)3-Way Spring Return Two Position Assembly Shipping Weight: 3.0 lbs (1360 g) 4.2” 4.6” 4.6” 5.6” 5.6” 5-1/8” 5-1/8” 5-1/8” 5-1/8” 4.2” 4.2” 4.2” 4.2” 3/8 (10) 5-1/8 (130) 3-9/16 (90) 4-7/8 (124) 2 (50) 2-1/2 (64) 1-11/16 (43) 4.2” 5.6” 5-1/8”8 | schneider-electric.comSelection Guide February, 2021 tc © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. Document Number: F-27395-16 Cavitation Limits On Valve Pressure Drop 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 0102030405060708090100110120130 Maximum ∆ P of V alve (psi) Inlet Pressure to Valve (psi) 50 °F Water 140 °F Water 160 °F Water 180 °F Water 200 °F Water 220 °F Water Cavitation Zone 1 1 Maximum allowable ∆ P for a valve with 45 psi and 50 °F water is 30 psi, based on cavitation. Pressure Drop Selection Modulating control valves are usually selected to take a pressure drop of at least 50% of the “available pressure.” As “available pressure” is often difficult to calculate, the normal procedure is to select a valve using a pressure drop at least equal to that in the coil or other load being controlled (except where small booster pumps are used) with a minimum pressure drop of at least 5 psi (34 kPa). When the design temperature drop is less than 60°F (33°C) for conventional heating systems, higher pressure drops across the valve are needed for good results (see below). Pressure Drop Design Temperature Load Drop °F (°C) Recommended Pressure Drop (% of available pressure) Multiplier on Load Drop 60 (33) or more50%1 x Load Drop 40 (22)69%2 x Load Drop 20 (11)70%3 x Load Drop A valve selected with too high a pressure drop can cause erosion and/or wire drawing of the flow characterizing insert. In addition, cavitation can cause noise, damage to the valve trim (and possibly the body), and choke the flow through the valve. A valve selected with too high a pressure drop can cause erosion of seals and/or wire drawing of the seat. In addition, can cause noise, damage to the valve trim (and possibly the body), and choke the flow. Do not exceed the maximum differential pressure (pressure drop) for the valve selected. The following formula can be used on higher temperature water systems, where cavitation could be a problem, to estimate the maximum allowable pressure drop across the valve: P m = 0.5 (P1 – P v ) Where: P m = Maximum allowable pressure drop (psi) P1 = Absolute inlet pressure (psia) P v = Absolute vapor pressure (psia) Note: Add 14.7 psi to gauge supply pressure to obtain 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 psia) Systems where cavitation is shown to be a problem can sometimes be adjusted to provide higher downstream back pressures. Valves having harder seat materials should be furnished if velocities are excessive.schneider-electric.com | 9 Selection Guide © 2021 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. February, 2021 tc Document Number: F-27395-16 Two and 3-Way Valve GPM Table Valve Differential Pressure (ΔP) Both3-Way2-Way3-Way2-Way3-Way2-Way3-Way2-Way3-Way2-Way3-Way2-WayBoth 0.3 Cv0.6 Cv0.7 Cv1.0 Cv1.2 Cv2.0 Cv2.1 Cv3.0 Cv3.5 Cv4.5 Cv4.7 Cv7.3 Cv7.7 Cv10 Cv 0.5 psi0.20.40.50.70.81.41.52.12.53.23.35.25.47.1 1 psi0.30.60.71.01.22.02.13.03.54.54.77.37.710.0 2 psi0.40.91.01.41.72.83.04.24.96.46.610.310.914.1 3 psi0.51.11.21.72.13.53.65.26.17.88.112.613.317.3 4 psi0.61.31.42.02.44.04.26.07.09.09.414.615.420.0 5 psi0.671.51.62.22.74.54.76.77.810.110.516.317.222.4 6 psi0.71.61.72.42.94.95.17.38.611.011.517.918.924.5 7 psi0.81.81.92.63.25.35.67.99.311.912.419.320.426.5 8 psi0.851.92.02.83.45.75.98.59.912.713.320.621.828.3 9 psi0.92.02.13.03.66.06.39.010.513.514.121.923.130.0 10 psi0.952.12.23.23.86.36.69.511.114.214.923.124.331.6 Flow Coefficient Selection When sizing a valve, you must select a flow coefficient (Cv), which is defined as the flow rate in U. S. gallons per minute (GPM) of 60 °F water that will pass through a fully open valve with 1 psi pressure drop (∆p; kv = m3/h with a 1 bar ∆P). It is calculated using the formula: Cv = GPM/( ) (∆P is in psi) or Kv = (m3/h)/( ) (∆P is in bar) Since the flow rate through the heat exchanger is usually specified, the only variable normally available in sizing a valve is the pressure drop. The following information can be used to determine what pressure drop to use in calculating a valve Cv. Once you have determined the Cv, consult Table-4, Table-5, Table-6 and Table-7 to select the valve body having the nearest Cv. Flow Characteristics The VBB/VBS series two- and three-way ball valve assemblies provide equal percentage flow, which is achieved with a flow characterizing insert. The parabolic shape of the orifice allows a gradual change in flow, so that equal movements of the valve stem, at any point of the flow range, change the existing flow an equal percentage, regardless of the flow rate. As shown in the graph to the right a ball valve equipped with the flow insert mirrors the flow characteristic of the coil, resulting in linear heat transfer. Flow Characterizing Insert Opening 100 90 80 70 60 50 40 30 20 10 0 1000607080950403020100 Linear Heat T ran s f e r A v e r a g e C o i l C h a r a c t e r i s t i c E q u a l P e r c e n t a g e F l o w C h a r a c t e r i s t i c Percent of Ball Opening Percent of Maximum FlowNext >