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licVavesHydrauofliLarge-SzeModuarVavesExampesAppcationsVavesirection-ControVavesKDSeriesESeriesMSeriesContro■ Unit configuration■ Specifications■ SpecificationsElectromagnetic Proportional Relief Valve UnitsElectromagnetic Proportional Relief ValvesDedicated Controller ■Hydraulic symbolApprox. weightkg19Approx. weightkgBolt insertion length1005.5Approx. weightkg1.4Sub-plate MPS-31Allowable back pressureMPaAccuracyF.S.±2.5 %12llllDllill Supply power voltageMaximum power consumption100 VAC50/60 Hz100 VANo.79E since2025Inline filterMIF-31Control rangeMPaSupply power voltageRated currentA5 to 70100 VAC50/60 HzControllerECR-3Hydraulic oil temperature°CAmbient temperature °C10 to 600 to 40Ambient conditions Ambient temperature: 0 to 40 °CAmbient humidity: 85 % RH max. (no condensation) Control Valves* For details on the MIF-31 and MPS-31, see pages 147 and 148. ● Be sure to read the operation manual for the product thoroughly before use to obtain a good understanding of the product.● PRV-12B and 13B proportional relief valves must be used with an ECR-3 proportional relief controller. ● For reliable operation, proportional relief valves must be used with an MIF-31 inline filter. If a line filter is used separately, it must be installed near the proportional relief valve. ● If the valve is used outside the flow range shown below, accuracy is not guaranteed. Be sure to use the valve within the specified ranges. Otherwise, the equipment may be damaged resulting in poor performance. ● Be sure to use the valve within the specified hydraulic oil temperature range. The use of an oil cooler is recommended. ● If air is not removed from the proportional relief valve, pressure fluctuates. If there is considered to be air inside the valve, for example, when it is used for the first time, be sure to remove the air. ● Install the proportional relief valve horizontally (with the air vent facing upward). ● If a rapid pressure drop is needed, install a check valve with bypass or the like to protect the proportional relief valve against a shock. ● When no load is applied to the hydraulic system under external control, if the pump is turned off while the control voltage is applied, or if a valve is operated without a load, there may be a significant difference between the feedback pressure and the target control pressure, and the solenoid current output may become maximum. In this case, the solenoid coil or the elements in the controller may be damaged. If no load is applied to the hydraulic circuit under external control, also set EXT voltage to 0 V.*One solenoid connection cable (5 m), one pressure sensor connection cable (5 m), and four O-rings (P9) are included.* Analog output is optional. The dedicated cable (ECR-ADO, sold separately) is needed.● The first proportional solenoid relief valves for 70 MPa in Japan. Any preset pressure can be configured thanks to current control.　Since the built-in pressure sensor provides feedback, pressure can be maintained stably even if the oil temperature changes.■VUP-12B■VUP-12B/13BElectromagnetic proportional relief valve ModelVUP-12BPRV-12BVUP-13BPRV-13BModel Flow rangeL/minPRV-12B0.25 to 1.0PRV-13B0.8 to 3.0ModelInput for external control(1)Variable resistor (5 to 10 kΩ) (2)Voltage control (0 to 5 V or 1 to 5 V) ECR-3(Input impedance: 470 kΩ) 110