Proportional Electro-Hydraulic s These valves are double-deck directional and flow control valves employing as their pilot the electro-hydraulic proportional pressure reducing valves with two proportional solenoids. The flow rate can be controlled by changing an input current to the solenoids and the direction of the flow can be controlled by providing the current to either solenoid of the two. By combining the valves with the power amplifiers specially designed for the valves, the speed control, acceleration, deceleration and directional control can be done with a single valve, which eventually makes the hydraulic circuits simple and contributes the cost of the hydraulic systems. EIC-H-11- Specification Description Model s EDFHG-3 EDFHG-4 EDFHG-6 Max. Operating Pressure Kgf/cm 2 25 Rated Flow [Valve P : 15 Kgf/cm 2 ] 1 14 28 Pilot Pressure *1 Kgf/cm² 15 ~ 16 *1 Pilot Flow at Normal 1 at Transition 3 4 6 Max. Tank Line Pres. Kgf/cm 2 16 21 Max. Drain Line Pres. Kgf/cm 2 3 *2 Rated Current 8 ma 98 ma 9 ma Coil resistance Hysteresis Repeatability 1 Ω 5% or less *3 1% or less *3 Approx. Mass Kg. 11 12 15 *1. Take care to keep the difference between the pilot pressure and drain port back pressure consistently greater than 15 Kgf/cm². *2. To obtain stable performance, keep the drain port back pressure low and minimize its fluctuations. *3. The hysteresis and repeatability values indicated in the specifications for each control valve are determined under the following conditions. Graphic Symbols External Pilot Type Internal Pilot Type a b a b Hysteresis value : obtained when YUKEN s applicable power amplifier is used. Repeatability Value : obtained when YUKEN s applicable power amplifier is used under the same conditions.. P T Y X P T Y Model Designation F- EDFH G -3-1 -3C2 -XY -E -1 Series Type of Valve Rated Flow Direction Pilot Spool Mounting Size of Flow Connection Special Seals Design F: Special Seals for Phosphate Ester Type Fluid (Omit if not required) EDFH: Proportiona l Electro- Hydraulic Directional and Flow Control Valves G: Sub-Plate Mounting 3 1 : 1 4 14 : 14 6 28 : 28 3C2 3C4 XY: Metre-out Metre-in None: Internal Pilot E:External Pilot 31 62 Proportional Electro-Hydraulic Pilot Relief Valve
Sub-Plate Sl. No. Model Sub-Plate Model s Thread size Mass Kg. 1 EDFHG-3 DHGM-3Y-18 3/4 BSP.F 4.7 2 EDFHG-4 3 EDFHG-6 DHGM-4-28 1/2 BSP.F 4.4 DHGM-4X-28 3/4 BSP.F 4.1 DHGM-6-58 DHGM-6X-58 3/4 BSP.F 1 BSP.F Sub-plates are available. Specify the sub-plate model number from the table above. When sub-plates are not used, the mounting surface should have a good machined finish. The Sub-plates are those for solenoid controlled pilot operated directional valves. For dimensions, see page. 384 and 385 7.4 Mounting Bolts Model Socket head cap Screw Qty Bolt Kit Model EDFHG-3 M6 x 35 Lg. 4 BKEDFHG-3-31 M6 x 45 Lg. 2 EDFHG-4 BKEDFHG-4-31 M1 x 5 Lg. 4 EDFHG-6 M12 x 6 Lg. 6 BKEDFHG-6-31 Applicable Power Amplifiers For stable performance, it is recommended that YUKEN s applicable power amplifiers be used (for details seee page no. 691) Model s : SK191-D24-1 Instructions Manual Adjustment In the event of an electric fault or emergency, a manual shift can be mad by screwing in the manual adjustment screw. Take care, however, that this manual shift has no flows adjusting function. For this operation, set the pilot pressure (or P-PORT pressure on an internal pilot model) below 7 Kgf/cm². After operation, be sure to return the manual adjustment screw completely to the original position. H Proportional Electro- Hydraulic Pilot Relief Valve Proportional Electro-Hydraulic Pilot Relief Valve 621
EDFHG-3-1-3C -XY- -31 DIMENSIONS IN MILLIMETRES Note: for valve mounting surface dimensions, see the Pilot Pressure Port 'X' dimensional drawings of sub-plates in common use. The direction can be altered to every 9 degree angles. 285.8 54 114.9 Cylinder Port 'B' Pilot Drain Port "Y" 46 12 7 48 27.5 The direction can be altered to every 9 degree angles. Cable Departure Cable Applocable : Outside Dia. 8 ~ 1 mm. Area : Not Exceeding 1.5 mm² 11 57.5 179.5 Air Vent 3 Places Manual Adj. Screw (Both Ends) Tank Port "T" Pressure Port "P" Cylinder Port 'A' 93.5 375 39 7 Dia. x Thru. 11 Dia. Spotface 4 Places 26 27 Of the two tank ports T, the tank port in the left side is normally used in our standard sub-plate, through, either side of the tank port T can be used without problem. Mounting Surface (O-Ring Furnished) 212 79 EDFHG-4-14-3C -XY- -31 11 Dia. x Thru. 17.5 Dia. Spotface 4 Places 34 Pressure Port "P" 285.8 Pilot Pressure Port "X" 11.6 91.3 69.8 72.9 91 48 27.5 Tank Port "T" Cable Departure Cable Applicable : Outside Dia. 8-1 mm Conductor Area : Not Exceeding 1.5 mm² Cylinder Port "A" 5 7 Dia. x Thru. 11 Dia. Spotface 2 Places 65.5 65.5 39 1.5 Pilot Drain Port "Y" Cylinder Port "B" 9.1 Air Vent 3 Places 57.5 116 34 35 185.5 Manual Adj. Screw (Both Ends) 622 4 3 Dia. Locating Pins 2 Places Mounting Surface (O-Ring Furnished) 24 5.4
EDFHG-6-28-3C -XY- -31 65.4 Tank Port "T" 13.5 Dia. x Thru. 2 Dia. Spotface 6 Places 53.2 13.2 285.8 Pressure Port "P" Pilot Drain Port "Y" DIMENSIONS IN MILLIMETRES 92.1 118 77 Pilot Pressure Port "X" 65.5 65.5 39 Cylinder Port "B" Cylinder Port "A" 13 Cable Departure Cable Applicable : Outside Dia. 8-1 mm Conductor Area : Not Exceeding 1.5 mm² 48 27.5 Manual Adj. Screw (Both Ends) Air Vent 3 Places 4 41 137 57.5 26.5 5.3 Mounting Surface (O-Ring Furnished) 255 6 Dia. Two Locating Pins 2 Places 6 O Position of cable departure can be changed. For details, refer to EDFHG-3 valve on page no. 622 Note: For valve mounting surface dimensions, see the dimensional drawings of sub-plates in common use. H Proportional Electro- Hydraulic Pilot Relief Valve 623
Input Current vs. Flow Viscosity : 3 cst Valve Pres. Diff. : P A (B), B (A) T 1 Kgf/cm² 12 1 8 6 4 2 1 8 6 EDFHG-3 4 2 2 4 6 8 1 Input Current ma E SERIES Valve Pressure Difference Vs. Flow 25 Kgf/cm² 24 16 6 ma 7 ma 75 ma Viscosity : 3 cst EDFHG-3 14 12 8 8 4 4 8 8 12 14 75 ma 7 ma 6 ma 16 24 Kgf/cm² 25 EDFHG-4 EDFHG-4 16 14 12 1 8 6 4 2 1 8 6 4 2 2 4 6 8 1 Input Current ma 25 Kgf/cm² 24 16 7 ma 8 ma 9 ma 8 28 24 16 8 8 16 8 16 24 Kgf/cm² 25 24 28 9 ma 8 ma 7 ma EDFHG-6 EDFHG-6 3 25 2 15 1 5 1 8 6 4 2 2 4 6 8 1 Input Current ma Kgf/cm² 25 24 6 ma 7 ma 8 ma 9 ma 16 8 4 3 2 1 8 16 24 Kgf/cm² 25 1 2 3 4 9 ma 8 ma 7 ma 6 ma 624
Frequency Response Phase (deg) Phase (deg) -2-4 -6-8 -1-12 -14-16 -18-2 -4-6 -8-1 -12-14 -16-18 -1-2 -3 Gain (db) -1-2 -3 Gain (db) EDFHG-3 Frequency Hz.2.4.7 1 2 4 7 1 2 4 EDFHG-4 Frequency Hz Phase Gain Model : EDFHG-3-1-3C2-E-31 Viscosity : 3 cst Pilot Pressure : 16 Kgf/cm² Travel of Spool : ±1% of Max. Stroke.2.4.7 1 2 4 7 1 2 4 Phase Gain Step Response These characteristics have been obtained by measuring on each valve. therefore, they may vary according to a hydraulic circuit to be used. 14 12 1 8 6 4 175 15 125 1 75 5 Viscosity : 3 cst Supply Pressure : 16 Kgf/cm² EDFHG-3.1s Step Signal Time EDFHG-4.1s Step Signal Phase (deg) -2-4 -6-8 -1-12 -14-16 -18 Model : EDFHG-4-14-3C2-E-31 Viscosity : 3 cst Pilot Pressure : 16 Kgf/cm² Travel of Spool : ±1% of Max. Stroke -1-2 -3 Gain (db) EDFHG-6 Frequency Hz.2.4.7 1 2 4 7 1 2 4 Phase Gain Model : EDFHG-6-28-3C2-E-31 Viscosity : 3 cst Pilot Pressure : 16 Kgf/cm² Travel of Spool : ±1% of Max. Stroke 4 35 3 25 2 15 1 Time EDFHG-6.1s Step Signal Time 625 H Proportional Electro- Hydraulic Pilot Relief Valve
Spare Parts List EDFHG- - -3C -XY- -31 List of Seals Sl. No. List of Seal Kits Model s EDFHG-3 EDFHG-4 EDFHG-6 Name of Parts Seal Kit s KS-EDFHG-3-31 KS-EDFHG-4-31 KS-EDFHG-6-31 Notes : 1. When ordering the seals, please specify the seal kit number from the table above. In addition to the above O-Rings, seals for solenoid ass y are included in the seal kit. 2. For the details of seals for solenoid ass y see page no. 557. Solenoid Ass y Model s EDFHG-3 EDFHG-4 EDFHG-6 Part No. Solenoid Ass y Model Qty. E318-Y6M1-28-61 2 Note: The connector assembly GDM-211-B-11 is not included in the solenoid assembly. Qty. EDFHG-3 EDFHG-4 EDFHG-6 1 O-Ring SO-NB-P28 2 -- -- 2 O-Ring SO-NB-A14 5 -- -- 3 O-Ring SO-NB-P9 12 8 4 4 O-Ring SO-NB-P4 2 2 2 5 O-Ring SO-NB-P34 -- 2 -- 6 O-Ring SO-NB-P22 -- 4 -- 7 O-Ring SO-NB-P4 -- -- 2 8 O-Ring SO-NB-P3 -- -- 4 9 O-Ring SO-NB-P14 -- -- 2 1 O-Ring SO-NB-P1 -- -- 2 626 Proportional Electro-Hydraulic Pilot Relief Valve