Proportional Electro-Hydraulic Relieving and Reducing Valves

Transcription

1 These valves consist of a small size but high performance EH series electro-hydraulic proportional pilot relief valve and reducing valve with relief function. The valves control the system pressure proportionally through a controlled input voltage. Moreover, a good response speed in reducing the pressure even at a large load capacity can be obtained with the relief function of the valves. EIC-H-116- Specification Model Number EHRBG-6 Description Max. Operating Pres. 25 *1 *2 EHRBG-1 Max. Flow L/min *1 *1 Max. Relieving Flow L/min. 15 Pres. Adj. Range Refer to Model No. Designation Coil Resistance Ω 1 Hysteresis 3% or Less Repeatability *2 1% or Less Frequency Response Refer to Frequency Response on page 661 Supply Electric Power 24V DC (21 to 28V DC included Ripple) Power Input (Max.) W 28 B: 7 / 5V DC Input Signal C: 14 / 5V DC H: 21 / 5V DC (at Flow rate Zero) Input Impedance kω 1 B: 5V DC / 7 Signal Output C: 5V DC / 14 H: 5V DC / 21 Ambient 5 C (With Circulated Air) The figures shown are those obtained where the differential pressure Between the secondary pressure port and tank port is 14. The repeatability of the valve is obtained by having it tested independently On the conditions similar to its original testing. Graphic Symbols Open-Loop Type Open-Loop Type With Sensor Model Number Designation F- EHRB -G -6 -C -S -5 Special Seals F: Special Seals for Phosphate Ester Type Fluid (Omit if not required Series Number EHRB: Proportional Electro-Hydraulic Relieving & Reducing Valve Type of Mounting G: Sub-Plate Mounting Valve Size 6 1 Adj. Range B: 8 ~ 7 C: 12 ~ 14 H: 15 ~ 21 B: 9 ~ 7 C: 12 ~ 14 H: 15 ~ 21 Control Type None: Open-Loop S : Open-Loop with sensor Design Number 5 6

2 Mounting Bolts Model Number Socket head cap Screw Qty EHRBG-6 4 M1 x 7Lg. EHRBG-1 6 Bolt Kit Model Number BKEHRBG-6-5 Sub-Plate Sl. No. Model Number Sub-Plate Model Numbers Thread size Mass Kg. 1 EHRBG-6 ERBGM /4 BSP.F 3. 2 EHRBG-1 ERBGM /4 BSP.F 6.5 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. Instructions at the Primary Port The necessary pressure at the primary pressure port should be equal to the set pressure plus 1 Drain Port The back pressure at the drain port should be less than 2. The pipe from the drain port should be connected to the reservoir directly and the end of the pipe must always be in the oil. EHRBG : EHRBG-6- -S-5 : (Open-Loop Type) (Open-Loop Type with Sensor) Load capacity The use of the valves at the load capacity of about 2 L is recommended. Even at the lowest, a load capacity of more than 1.4 L is required DIMENSIONS IN MILLIMETRES Power Indicator Lamp Tank Port "T" Approx. Mass. Open Loop Type Kg. Open Loop Type Sensor...13 Kg Electrical Conduit Connection 1/2 BSP.F Thd Amplifier (Refer to Page on 641) Primary Port Air Vent 3 Hex. Soc. Drain Port Secondary Port 11 Dia. x Thru Dia. Spot Face Close-Loop Type Opened-Loop Type with Sensor H Proportional Electro-Hydraulic Relieving and Reducing Valves Inc. Manual Pr. Adj. Screw 3 Hex. Soc Adaptor Octagonal Width Mounting Surface (O-Ring Furnished) Locking Pin 6 Dia

3 EHRBG : EHRBG-1- -S-5 : (Open-Loop Type) (Open-Loop Type with Sensor) EH SERIES Power Indicator Lamp Tank Port "T" Electrical Conduit Connection 1/2 BSP.F Thd. Amplifier (Refer to Page on 641) Primary Port Drain Port Secondary Port 11 Dia. x Thru Dia. Spot Face 6 Places Opened-Loop Type with Sensor Air Vent 3 Hex. Soc Inc. Manual Pr. Adj. Screw 3 Hex. Soc Adaptor Octagonal Width Mounting Surface (O-Ring Furnished) 6 Locking Pin 6 Dia Approx. Mass. Open Loop Type Kg. Open Loop Type Sensor Kg. Sub-Plate DIMENSIONS IN MILLIMETRES ERBGM-6 ERBGM-1 M1 Thd. x 2 Deep 8.8 Dia. x Thru 14 Dia. Spotface Dia. PF 3 8 Thd. PF 3 8 Thd. M1 Thd. x 2 Deep 6 Places 11 Dia. x Thru 17.5 Dia. Spotface PF 3 8 Thd. 14 Dia PF ¾ Thd. 18 Dia 2 Places Dia. 7 Dia. 1 Deep PF 1 4 Thd Dia Dia. 2 Places PF Thd. 2 Places

4 Input Signal Voltage Vs. Secondary Primary : 25 Viscosity : 3 cst EHRBG-6 EHRBG EHRBG-6-H 1 EHRBG-1-H Seconday EHRBG-6-C EHRBG-6-B Seconday EHRBG-1-C EHRBG-1-B Input Signal Voltage V DC Input Signal Voltage V DC Flow Vs. Secondary EHRBG-6-B EHRBG-1-B Secondary L/min. Secondary L/min. H Secondary EHRBG-6-C L/min. Secondary EHRBG-1-C L/min. Proportional Electro-Hydraulic Relieving and Reducing Valves 9

5 Secondary EHRBG-6-H L/min. Secondary EHRBG-1-H L/min. Viscosity Vs. Secondary EHRBG-6-B Oil : ISO VG 32 Oil. EHRBG-1-B Sec Sec C Viscosity cst EHRBG-6-C Sec Viscosity C cst EHRBG-6-H Viscosity Sec Viscosity C cst EHRBG-1-C C cst EHRBG-1-H Sec Viscosity C cst Sec Viscosity C cst

6 (db) (db) (db) Step Response (Example) The following step response measurements are taken when the trapped oil volume is 2 L. The step response varies by trapped oil volume EHRBG-6-B EHRBG-1-B EHRBG-6-C EHRBG-1-C Primary : 25 Trapped Oil Volume : 2 L Viscosity : 3 cst EHRBG-6-H EHRBG-1-H E SERIES Frequency Response (db) EHRBG-6-B Secondary : 54± EHRBG-1-B Primary : 25 Trapped Oil Volume : 2 L Viscosity : 3 cst Secondary : 54± EHRBG-6-C Secondary : 11±3 EHRBG-6-H (db) Seconday : 11± Secondary : 17± Secondary : 16±44-18 EHRBG-6-C EHRBG-6-H (db) H Proportional Electro-Hydraulic Relieving and Reducing Valves