Refer to the QuickLIT website for the most up-to-date version of this document.1V248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletinThe V248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants regulate water flow to control refrigerant head pressure in systems with single or multiple water-cooled condensers.V248valves have an adjustable opening point in a refrigerant pressure range of 200 to 400 psi (13.8 to 27.6 bar). V248 valves are available in 1/2 in. through 1-1/2 in. size for use with standard, non-corrosive, high-pressure refrigerants. Maritime models, which have nickel copper (Monel®) internal parts, are available for applications where the media may be corrosive to the internal parts. This product is made of copper alloy, which contains lead. The product is therefore not to be used on drinking water.Figure 1: V248 Series ValveTable 1: Features and BenefitsFeaturesBenefitsNo Close Fitting or Sliding Parts in Water PassagesProvides robust control in less than ideal conditions.Accessible Range SpringAllows easy manual flushing.Take-Apart ConstructionAllows access to valve interior without removing valve from refrigeration system or pumping down the system.Pressure-Balanced DesignResists changes to setpoint caused by gradual or sudden water pressure changes.Corrosion-Resistant Material for Internal PartsPromotes long valve life.V248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure RefrigerantsProductBulletinCode No. LIT-12011515Issued May 2018V248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin2Application OperationThe V248 valve controls refrigerant head pressures by sensing the condensing pressure and adjusting water flow to meet cooling demand as the condenser requirements change. The 3-way design modulates water between the condenser and the bypass line.Valve SizingEach application is unique and requires specific engineering data to properly size and design a system to fulfill the appropriate requirements. Typically, a valve is replaced with another valve of the same size in a properly sized and engineered system.To make a rough field estimate of the size of valve for an application, find the valve size needed by locating a point on a flow chart (see Figure6 through Figure9) that satisfies these requirements:•water flow required by the condenser (Flow)•refrigerant head pressure rise (PRISE)•available water pressure (PAVAIL)Follow these steps, and use the information obtained to locate a point on one of the flowcharts (see Figure6 through Figure9) that satisfies all three steps.1.Take the water flow required by the condenser (Flow) from information provided by the manufacturer of the condensing unit. If the manufacturer’s information is unavailable, use the following information to make a rough approximation of water flow in gallons per minute (gpm) [cubic meters per hour (m3/hr)] using Figure2:•System Capacity (Tons of Refrigeration)•Outlet Water Temperature (Temp. Outlet)•Inlet Water Temperature (Temp. Inlet)Calculate the flow using the following formula:Note:If the outlet temperature is unknown, assume it to be 10F(6C) above the inlet temperature.2.Determine refrigerant head pressure rise above the valve opening point (PRISE) using Figure4 and the following steps:a.The Valve Closing Pressure (PCLOSE) is equal to the refrigerant pressure at the highest ambient temperature the refrigeration equipment experiences in the Off cycle. Use a Pressure-Temperature Chart for the refrigerant selected to find this pressure.b.To approximate the Valve Opening Pressure (POPEN), add about 10 psi (0.7 bar) to the Valve Closing Pressure. c.From the Pressure-Temperature Chart for the refrigerant selected, read the Refrigerant Condensing Pressure (PCOND) (operating head pressure) corresponding to the selected condensing temperature.d.Subtract the Valve Opening Pressure from the Refrigerant Condensing Pressure. This gives the head pressure rise. See Figure4.IMPORTANT:The V248 Series 3-Way Pressure-Actuated Water-Regulating Valve for High-Pressure Refrigerants is intended to control water or coolant flow under normal operating conditions. Where failure or malfunction of the V248 valve could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the V248 valve.Figure 2: Flow RequiredFlow = Tons of Refrigeration x 30(Temp. - Temp.)OutletInletFIG:flw_eqnFigure 3: Valve Opening PressureFIG:eqn_opn_prssrP = P +10 psi (0.7 bar)OPENCLOSEFigure 4: Refrigerant Head Pressure RiseFIG:eqn_hd_prssr_rsP = P - PRISECONDOPENV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin33.Determine the available water pressure to the valve (PAVAIL) using the following steps and Figure5. This the actual water pressure available to force water through the valve.a.Determine the minimum inlet pressure (PIN). This is the water pressure from city water mains, pumps, or other sources.b.Pressure drop through condenser (PCOND) is the difference in water pressure between the condenser inlet and the condenser outlet. Obtain this information from the condenser manufacturer.c.Estimate or calculate the pressure drop through all associated piping (PLOSS).d.Subtract the PCOND and PLOSS from PIN. The result is PAVAIL. 4.Select the proper valve size from the flowcharts by locating a point on a chart that satisfies the flow, the head pressure rise above opening point, and the pressure drop across the valve.Metric ConversionsUse these equations to convert between U.S. and S.I. units.•1 dm3/s = 3.6 m3/h = 15.9 U.S. gal. /min. = 13.2U.K.gal. /min.•1 bar = 100 kPa = 0.1 MPa 1.02 kg/cm2 = 0.987atm 14.5 psiValve Sizing ExampleA 12-ton capacity R410A system has an inlet water temperature of 85F (29C) and an outlet water temperature of 95F (35C).The required flow for an R410A system is found to be 30 GPM (6.8 m3/h). The manufacturer’s recommended condensing temperature is 105°F (41C), and the corresponding condensing pressure is 340psi (23.4 bar). The maximum ambient temperature is estimated at 90F (32C). City water pressure is 40psi (2.8 bar) and the manufacturer’s table gives a pressure drop through the condenser at 15 psi (1 bar). Drop through the installed piping is approximately 4psi (0.3 bar). Use the valve sizing process to find the correctly sized valve for this application:1.Find or calculate the water flow required by the condenser. See Figure2.•Flow: According to the data provided, the required flow is 30 GPM (6.8 m3/h).2.Determine refrigerant head pressure rise above the valve opening point. See Figure3 and Figure4.•PCLOSE: Closing point is refrigerant pressure corresponding to 90F (32C) = 274 psi (18.9bar). Using a refrigerant pressure-temperature charts for the refrigerant (R410A), the refrigerant is 274 psi at 90F (18.9 bar at 32C).•POPEN: Opening point = 274 psi + 10 psi = 284psi (18.9 bar + 0.7 bar = 19.6 bar)•PCOND: Condensing pressure = 340 psi (23.4bar)•PRISE: Head pressure rise = 340 psi -284 psi = 56 psi (23.4 bar - 19.6 bar = 3.9 bar)Figure 5: Available Water PressureCooling TowerPumpP1P2PPLoss 1Loss 23-WayValvePINCONDPP1P2=-LOSSPPPLoss 1Loss 2=++ ...CondenserBalancing ValveBypass LineFIG:3wy_prss_drpP= P- (P+ P)AVAIL IN COND LOSSV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin43.Determine the available water pressure to the valve. See Figure5.•PIN: Inlet water pressure = 40 psi (2.8 bar)•PCOND: Pressure drop through the condenser = 15 psi (1 bar)•PLOSS: Combined piping pressure loss = 4 psi (0.3 bar)•PAVAIL: Available water pressure to the valve = 40psi - (15 psi + 4 psi) = 21psi (2.8 bar - [1 bar + 0.3 bar] = 1.4 bar)4.Using the following data and the flowcharts, the only valve that comes close to meeting all the criteria (without being oversized) is a 1 in. valve. See Figure8.•Flow = 30 GPM (6.8 m3/h)•PRISE = a head pressure rise of 56psi (3.9 bar)•PAVAIL = available water pressure to the valve is 21 psi (1.4 bar)V248 FlowchartsThe maximum recommended differential water pressure across a valve is 20 psi (1.4 bar). Figure 6: 1/2 in. Direct Acting Valve Flowchart0.71.42.12.83.54.14.85.56.26.90.00.71.42.02.73.44.10369121518102030405060708090100110Refrigerant Head Pressure Above Opening PRise(bar)Flow (m³/hr)Flow (gpm)Refrigerant Head Pressure Above Opening PRise( psig )FIG:V248_0.5 in. graph10 (0.7)5 (0.3)2 (0.1)Pressure DropThrough Valve,psig(bar)14.5 (1.0)20 (1.4)Figure 7: 3/4 in. Direct Acting Valve Flowchart0.71.42.12.83.54.14.85.56.26.90.01.12.33.44.55.70510152025102030405060708090100110Refrigerant Head Pressure Above Opening PRise(bar)Flow (M³/hr)Flow (gpm)Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)Pressure DropThrough Valve,psig(bar)14.5 (1.0)20 (1.4)FIG:V248_0.75 in. graphV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin5Figure 8: 1 in. Direct Acting Valve Flowchart0.71.42.12.83.54.14.85.56.26.90.02.34.56.89.111.401020304050102030405060708090100110Refrigerant Head Pressure Above Opening PRise(bar)Flow (m³/hr)Flow (gpm)Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)14.5 (1.0)20 (1.4)Pressure DropThrough Valve,psig(bar)FIG:V248_1.0 in. graphFigure 9: 1-1/4 in. Direct Acting Valve Flowchart0.71.42.12.83.54.14.85.56.26.90.02.34.56.89.111.413.615.9010203040506070102030405060708090100110Refrigerant Head Pressure Above Opening PRise(bar)Flow (m³/hr)Flow (gpm)Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)14.5 (1.0)20 (1.4)Pressure DropThrough Valve,psig(bar)FIG:V248_1.25 in. graphFigure 10: 1-1/2 in. Direct Acting Valve Flowchart0.71.42.12.83.54.14.85.56.26.90.02.34.56.89.111.413.615.918.201020304050607080102030405060708090100110Refrigerant Head Pressure Above Opening PRise(bar)Flow (m³/hr)Flow (gpm)Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)14.5 (1.0)20 (1.4)Pressure DropThrough Valve,psig(bar)FIG:V248_1.5 in. graphV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin6DimensionsV248 Screw Connection Valves Table 2: 1/2 in. Through 1-1/4 in. V248 Screw Connection Valves DimensionsValve SizeDimensions in Inches (Millimeters)ABCDEF1/2 in.3-1/16 (78)2 (51)8-11/16 (220)3-13/16 (96)1-1/2 (38)3-3/8 (86)3/4 in.3-3/8 (86)2-3/16 (55)9-3/4 (248)4-3/16 (106)1-3/4 (44)3-13/16 (98)1 in.4-3/4 (121)2-13/16 (71)12-1/2 (318)5-15/16 (151)2-1/16 (52)4-1/2 (114)1-1/4 in.4-3/4 (121)2-13/16 (71)13-1/4 (336)6-1/8 (156)2-3/8 (60)4-3/4 (121)Figure 11: 1/2 in. Through 1-1/4 in. V248 Screw Connection Valves DimensionsACD BEPort 3PluggedPort 1Port 2FIG:V248_thddFV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin7 Table 3: 1/2 in. V248 Screw Connection Valves DimensionsValve SizeDimensions in Inches (Millimeters)ABCDEF1-1/2 in.6 (152)3-1/2 (89)15-1/4 (382)8 (203)9-5/16 (237)6-7/8 (175)Figure 12: 1-1/2 in. V248 Screw Connection Valves DimensionsEPORT 1PORT 2PORT 3FIG:V248_3 way valveV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin8V248 Union Sweat Connection Valves Table 4: V248 Union Sweat Connection Valves DimensionsValve SizeDimensions in Inches (Millimeters)ABCDEF3/4 in.3-3/8 (86)2-3/16 (55)9-3/4 (248)4-3/16 (106)1-3/4 (44)3-13/16 (98)1 in.4-3/4 (121)2-13/16 (71)12-1/2 (318)5-15/16 (151)2-1/16 (52)4-1/2 (114)1-1/4 in.4-3/4 (121)2-13/16 (71)13-1/4 (336)6-1/8 (156)2-3/8 (60)4-3/4 (121)Figure 13: V248 Union Sweat Connection Valves DimensionsBFDAECPort 1Port 3PluggedPort 2FIG:V248_unbdyV248 Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants ProductBulletin9SelectionStock ModelsWhen ordering V248 valves, specify the complete product code number. See Table5 and Table6. Table 5: North American Standard Production Models - Range 200 to 400 psiProduct Code NumberConstructionValve Size and ConnectionElement StyleShipping Weight, lb (kg)V248GB1-001CDirect Acting, Commercial1/2 in. NPT ScrewStyle 55.0 (2.3)V248GC1-001CDirect Acting, Commercial3/4 in. NPT ScrewStyle 56.5 (3.0)V248GD1-001CDirect Acting, Commercial1 in. NPT ScrewStyle 512.0 (5.4)V248GE1-001CDirect Acting, Commercial1-1/4 in. NPT ScrewStyle 516.0 (7.2)V248GF1-001CDirect Acting, Commercial1-1/2 in. NPT ScrewStyle 525.0 (11.3)V248GK1-001CDirect Acting, Commercial3/4 in. Union SweatStyle 57.0 (3.2)V248GL1-001CDirect Acting, Commercial1 in. Union SweatStyle 512.0 (5.4)V248GM1-001CDirect Acting, Commercial1-1/4 in. Union SweatStyle 513.7 (6.2)Table 6: European Standard Production Models - Range 13.8 to 27.8 barProduct Code NumberConstructionValve Size and ConnectionElement StyleShipping Weight, lb (kg)V248GB1B001CDirect Acting, Commercial1/2 in. BSPT Screw, ISO7Style 55.0 (2.3)V248GC1B001CDirect Acting, Commercial3/4 in. BSPT Screw, ISO7Style 56.5 (3.0)V248GD1B001CDirect Acting, Commercial1 in. BSPT Screw, ISO7Style 512.1 (5.5)V248GE1B001CDirect Acting, Commercial1-1/4 in. BSPT Screw, ISO7Style 516.0 (7.2)V248GF1B001CDirect Acting, Commercial1-1/2 in. BSPT Screw, ISO7Style 525 (11.3)V248HC1B001CDirect Acting, Maritime3/4 in. BSPP Screw, ISO228Style 56.5 (3.0)Next >