Proportional Electro-Hydraulic Flow Control (and Check) Valves
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1 Proportional Electro-Hydraulic Flow Control (and Check) Valves EH SERIES The system flow rate can be controlled remotely as desired by regulating input voltage. Further, since pressure and temperature compensation functions are provided the preselected flow rate is not affected by pressure (load) or temperature (fluid viscosity). EIC-H-117- Specification odel Number Description EHF G-3- EHF G-6- ax. Operating Pres. Kgf/cm² 21 ax. etred Flow 6: 6 : in. etred Flow in. Differential Pressure Kgf/cm² 1 Free Flow (only with check valves) Pilot Flow At Normal.5 1 At Transition 2.6 in. Pilot Pressure Kgf/cm² Frequency Response Refer to Frequency Response on page 666 Hysteresis 3% or Less Repeatability 1% or Less Coil Resistance Ω 1 Supply Electric Power 2V DC (21 to 28V DC included Ripple) Power Input (ax.) W 28 Graphic Symbols Input Signal Voltage ax. etred Flow / 5 V DC Input Impedance kω 1 5 C Ambient Temperature (With Circulated Air) inimum differential pressure means fine pressure compensation at inlet and outlet port. The repeatability of the valve is obtained by having it tested independently On the conditions similar to its original testing. EHFCG odel Number Designation F- EHF -G E -5 Special Seals F: Special Seals for Phosphate Ester Type Fluid (Omit if not required 662 Series Number EHF: Proportional Electro- Hydraulic Flow Control Valve EHFC: Proportional Electro- Hydraulic Flow Control and Check Valve Type of ounting G: Sub-Plate ounting Valve Size ax. etred Flow Pilot Connection 3 6: 6 : 6 : None: E : Design Number 5
2 ounting Bolts odel Number -3 EHFCG-3-6 EHFCG-6 Socket head cap Screw 1 x 8Lg. 16 x 13Lg. Qty Bolt Kit odel Number BK-3-5 BK-6-5 Sub-Plate Sl. No. 1 2 odel Number -3 EHFCG-3-6 EHFCG-6 Sub-Plate odel Numbers Thread size ass Kg. EFG-3Y-28 3/8 BSP.F 5.7 EFG-3Z-28 1 BSP.F 5.6 EFG-6Y-28 1 BSP.F 12.5 EFG-6Z / BSP.F 16 Sub-plates are available. Specify sub-plate model number from the table above. When sub-plates are not used, the mounting surface should have a good machined finish. For Sub-plates details please refer page no Instructions Drain Back Pressure Check that the drain back pressure does not exceed 2 Kgf/cm². Pilot Type Selection This valve is constructed so as to operate at a predetermined pilot pressure, for the 3, a pilot pressure of 1 Kgf/cm² or higher is required. For the 6, the required pilot pressure is 15 Kgf/cm² or higher. To obtain such a required pilot pressure, select the pilot type according to the circuit examples on the right. 1 Example of Circuit Use the external pilot type (type symbol E) whether a meter-in or meter-out circuit is employed. 3 Use the internal pilot type (type symbol: None) 3 EHFCG- - -E EHFCG- - -E-5 6 H Use the external pilot type (type symbol: E) E E-5 6 Proportional Electro-Hydraulic Flow Control and Check Valves 663
3 EHFCG -3 Electrical Conduit Connection 1/2 BSP.F Thd. 11 Dia. x Thru Dia. Spot Face Places Inlet port for controlled flow or Outlet port for reverse free flow Air Vent 3 Hex. Soc. Locking Pin 6 Dia. Outlet port for controlled flow or Inlet port for reversed free flow Inc. anual Pr. Adj. Screw 3 Hex. Soc Pilot Port Drain Port Adaptor Octagonal Width ounting Surface (O-Ring Furnished) DIENSIONS IN ILLIETRES EHFCG -6 Electrical Conduit Connection 1/2 BSP.F Thd Dia. x Thru. 26 Dia. Spot Face Places Inlet port for controlled flow or Outlet port for reverse free flow Air Vent 3 Hex. Soc Inc. anual Pr. Adj. Screw 3 Hex. Soc 9 72 Locking Pin 16 Dia. 2 Places ounting Surface (O-Ring Furnished) Outlet Port for controlled flow or Inlet port for reversed free flow Pilot Port Drain Port Adaptor Octagonal Width Detail of Amplifier Connecting Terminal Terminal Name IN Input Signal (+) C Input Signal (CO) V 2 V } Power Supply CH Output Current Check (to C). DITHER Use as it is since they are factory preset to the optimum position. (Do not touch is in normal condition) 66
4 Circuit Schematic IN Input C OSC CH X DITHER.2 Ω 2V V For CH terminal, external instruments should have input impedance of more than 1 kω. Use shielded cable for Input connection. The ground of the shielded cable must be connected to input signal side. Input Signal Voltage Vs. Viscosity : 3 cst EHFCG 3 EHFCG 6 1 EHF? G EHF? G Input Signal Voltage V DC Differential Pressure Vs. EHFCG Kgf/cm² Differential Pressure Input Signal Voltage V DC EHFCG Kgf/cm² Differential Pressure H Proportional Electro-Hydraulic Flow Control and Check Valves 665
5 Viscosity Vs. Oil : ISO VG 6 Oil. Gain(dB) 1 11 EHFCG EHFCG 6 EH SERIES Temperature Viscosity C cst Temperature Viscosity C cst Step Response (Example) EHFCG 3 6 Step Signal EHFCG 6 Step Signal Time The step response right are those obtained when the valve itself is tested independently. The step responses may differ from them when the valve is used in combination with other control valves. Frequency Response Trapped Oil Volume : 1 L Viscosity : 3 cst Time EHFCG 3 EHFCG 6 Phase(deg) Frequency(Hz) : 65±15 Supply Pressure : 1 Kgf/cm² Phase Gain Phase(deg) Gain(dB) Frequency(Hz) : ± Supply Pressure : 1 Kgf/cm² Phase Gain 666
EHBG-03 EHBG-06 EHBG-10. Refer to Model No. Designation. 2% or Less(1%) 1% or Less *2. Refer to frequency Response on page V DC
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NO. 10 01E September 1, 2010 Public Relations Group Products Publicity Section Sales Administration Department Hamamatsucho Seiwa Bdg., 4-8, Shibadaimon 1-chome, Minato-ku, Tokyo 105-0012, Japan Tel: +81-3-3432-2113
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