Refer to the QuickLIT website for the most up-to-date version of this document.1V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product BulletinThe V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants come in two types of control action: direct acting and reverse acting. V246 valves regulate water flow to control refrigerant head pressure in systems with water-cooled condensers.The V246 Series Valves are available in 3/8 in. through 2 in. sizes and have a maximum allowable water pressure of 150 psi (10.3 bar). Direct acting V246valves have an adjustable opening point in a refrigerant pressure range of 200 to 400 psi (13.8 to 27.6 bar), and reverse acting valves have a range of 135 to 300 psi (9.3 to 20.7 bar). V246 valves may be used with standard non-corrosive 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: V246 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.V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure RefrigerantsProduct BulletinCode No. LIT-12011514Issued May 2018V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin2Application OperationThe V246 valve controls refrigerant head pressure by sensing the condensing pressure and adjusting water flow as the condenser requirements change.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 Figure11) 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 Figure11) 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 and Figure2 to make a rough approximation of water flow in gallons per minute (gpm) [cubic meters per hour (m3/hr)]:•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. See Figure3.Note:Add about 20 psi (1.4 bar) for 3/8 in. valves. 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 Figure4.3.Determine the available water pressure to the valve (PAVAIL) using the following steps and Figure5. This is the actual water pressure available to force water through the valve.a.Determine the inlet pressure (PIN). This is the water pressure from city water mains, pumps, or other sources.IMPORTANT:The V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants is intended to control water or coolant flow under normal operating conditions. Where failure or malfunction of the V246 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 V246 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 - PRISECONDOPENV246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin3b.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 manufacturer’s recommended condensing temperature is 105°F (41C), which corresponds to a pressure of 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). The combined pressure loss due to 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 36 GPM (8.2 m3/h).2.Determine the 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 22-WayValvePINCONDPP1P2=-LOSSPPPLoss 1Loss 2=++ ...CondenserFIG:2wy_prss_drpP= P- (P+ P)AVAIL IN COND LOSSV246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin43.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 1-1/4 in. valve (see Figure11):•Flow = 36 GPM (8.2 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)V246 FlowchartsThe maximum recommended differential water pressure across a valve is 60 psi (4.1 bar). Figure 6: 3/8 in. Direct Acting Low-Flow Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.00.10.20.30.50.60.00.51.01.52.02.53.0102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_3.8 in. Low graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin5Figure 7: 3/8 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.00.50.91.41.82.32.73.23.6024681012141618102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_3.8 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3Figure 8: 1/2 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.01.12.33.44.55.7051015202530102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_0.5 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin6Figure 9: 3/4 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.01.12.33.44.55.76.805101520253035102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_0.75 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3Figure 10: 1 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.02.34.56.89.111.413.60102030405060102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_1.0 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin7Figure 11: 1-1/4 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.04.59.113.618.222.727.3020406080100120102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_1.25 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3Figure 12: 1-1/2 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.04.59.113.618.222.727.3020406080100120102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psig(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_1.5 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin8Figure 13: 2 in. Direct Acting Valve Flowchart0.71.42.12.83.54.24.95.56.26.97.68.30.04.59.113.618.222.727.3020406080100120102030405060708090100110120130Refrigerant Head Pressure Above Opening PRise( psig )10 (0.7)5 (0.3)2 (0.1)PAvailPressure Drop Through Valve psi(bar)40 (2.8)30 (2.1)50 (3.4)60 (4.1)14.5 (1.0)20 (1.4)FIG:V246_2 in. graphRefrigerant Head Pressure Above Opening PRise( bar )Flow (gpm)Flow (m/hr)3V246 Series 2-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product Bulletin9DimensionsV246 Screw Connection Valves Dimensions Figure 14: V246 Screw Connection Valves DimensionsACD BEPort 1Port 2FIG:V246_thrddFigure 15: V246 Angle-Body Screw Connection Valves DimensionsBDECAFIG:V246_anglbdyTable 2: V246 Screw Connection Valves DimensionsValve SizeDimensions in Inches (Millimeters)ABCDE3/8 in.2-5/8 (67)1-5/8 (41)6-1/2 (166)3-1/2 (89)3 (77)1/2 in.3-1/16 (78)2 (51)7-3/16 (182)3-13/16 (96)3-3/8 (86)3/4 in.3-3/8 (86)2-3/16 (55)8 (203)4-3/16 (106)3-13/16 (98)1 in.4-3/4 (121)2-13/16 (71)10-1/2 (267)5-15/16 (151)4-9/16 (116)1-1/4 in.4-3/4 (121)2-13/16 (71)10-7/8 (276)6-1/8 (156)4-3/4 (121)Table 3: V246 Angle-Body Screw Connection Valves DimensionsValve SizeDimensions in Inches (Millimeters)ABCDE3/8 in.2-3/4 (70)1-5/8 (41)6-15/16 (176)3-5/8 (92)3-1/8 (80)1/2 in.3-1/8 (80)2 (51)7-1/2 (191)3-7/8 (98)3-1/2 (88)3/4 in.3-9/16 (90)2-1/8 (55)8-9/16 (217)4-5/16 (110)4 (101)Next >