Proportional Electro-Hydraulic Pilot Relief Valves

Transcription

1 Proportional Electro-Hydraulic This valve consists of a small DC solenoid and a direct-acting relief valve. It serves as a pilot valve for a low flow rate hydraulic system or a proportional electro-hydraulic control valve and controls the pressure in proportion to the input current. Note that this valve is used in conjunction with the applicable power amplifier. Specifications Description Max. Operating Pres. Max. Flow Min. Flow Adj. Range () Rated Current Coil Resistance Hysteresis Repeatability Approx. Mass EDG- 4.5 (55 ) L/min (.5 U.S.GPM). L/min (.8 U.S.GPM) Refer to Model Number ation EDG- -B 8 ma EDG- -C 9 ma EDG- -H 95 ma % or less % or less kg (4.4 lbs.) Graphic Symbols Without Safety With Safety Model Number ation F- Special Seals ED G - V -C - -PN T Type of Applicable Adj. Range Safety P-Line T-Line Number Mounting Size Control () Orifice Orifice -5 Number Standards F Special Seals for Phosphate Ester Type Fluid (Omit if not required) ED Proportional Electro- Hydraulic Pilot Relief G Mounting None General use V Vent Control of Relief (Omit if not required) B ( 7 - ) C ( 45-75) H ( 75-55) None Without Safety With Safety PN Without Orifice (Standard) T5 T T 5 Refer to. When the valve is to be used for vent control purpose, orifice adjustment is required due to piping capacity limitations. Therefore, consult your Yuken representative in advance.. The orifice used as the pilot valve may differ from the standard orifice.. Standards None... Japanese Standard "JIS" and European Standard 9... N. American Standard

2 SERIES Attachment Mounting Bolts Four socket head cap screws in the table below are included. Descriptions Japanese Standard "JIS" European Standard N. American Standard Soc. Hd. Cap Screw M5 45 Lg. No. - 4 UNC -/4 Lg. Applicable Power Amplifier For stable performance, it is recommended that Yuken's applicable power amplifiers be used (for details see page 767, 77, 78). AME-D-- - AME-D-- SK- - - SK5- (For DC power supply) AMN-D- (For DC power supply) Piping Size /8 /4 /8 Japanese Standard "JIS" DSGM-- DSGM-X- DSGM-Y- Thread Size Rc /8 Rc /4 Rc /8 European Standard DSGM--8 DSGM-X-8 Thread Size /8 BSP.F /4 BSP.F N. American Standard Thread Size DSGM--9 /8 NPT DSGM-X-9 /4 NPT DSGM-Y-9 /8 NPT Approx. Mass kg (lbs.).8 (.8).8 (.8).8 (.8) s 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. s are those for /8 solenoid operated directional valves. For dimensoins, see page 56. Instructions Tank-Line Back Check that the tank line back pressure does not exceed. (9 ). Vent Control When the valve is used for vent control of relief valves or others, use the pipes of 6 mm (.4 in.) ID. mm (.8 in.) or less length for connection. If the pressure is instable, provide a. to.5 mm (.4 to.6 in.) diameter orifice to the vent port of the relief valves or others. Circuit Control When the pressure in a circuit is directly controlled with this valve, set the trapped oil volume being more than 4 cm (.44 cu. in.). Safety Setting The pressure of the safety valve at the maximum flow is preset at the value equal to the upper limit of the pressure adjustment range plus (9 ). In case where the upper limit of operating pressure is low or the upper limit of flow rate to be used is different from the specified maximum flow, please adjust and determine the setting pressure of the safety valve at the value calculated from the following formula. Setting pressure = (Operating pressure upper limit) + (Additional pressure indicated below) Additional H E L /min.5.5 U.S.GPM To lower the setting pressure, turn the safety valve pressure adjustment screw anti-clockwise. After adjustment, be sure to tighten the lock nut

3 EDG- - --PNT -5/59 EDG- - -PNT -5/59 With Safety Without Safety Fully Extended 6(8.5) Fully Extended 5 (.5) Adj. Screw for Safety (.) Hex.Soc. 79(.) 4.5 (.59) 5.5(.) Dia. Through 9.5(.7) C'Bore 4 Places.5 (.8).75 (.) 8.5 (.) INC. (.).5 (.8) 48 (.89) Lock Nut (.9) Hex. For other dimensions, refer to the without safety valve. The direction can be altered to every 9 degree angles. Port "P" Tank Port "T" DIMENSIONS IN MILLIMETRES (INCHES) Connector (The direction can be altered to every 9 degree angles.) 7.5 (.8) Cable Departure Cable Applicable Outside Dia mm (. -.9 in.) Conductor Area Not Exceeding.5 mm (. sq. in.) Air Vent (.) Hex. Soc. Places 9 (.54) 9.5 (7.5) 86.5 (.4) 6.5 (.4) 5 (.98) 7.5 (.48) 5 (.97) 94.5 (.7) 57.5 (.6) Manual Adj. Screw (.) Hex.Soc. INC. Mounting Surface (s Furnished) Note For valve mounting surface dimensions, see the dimensional drawings of sub-plates (P.56) in common use. 67 Houston Pilot Relief Hydraulic s

4 SERIES Step Response (Example) These characteristics have been obtained by measuring on each valve. Therefore, they may vary according to a hydraulic circuit to be used EDG--B EDG--C EDG--H s.s.s 5 5 Step Signal 8 Step Signal Step Signal 4 5 Time Time Time Trapped Oil Volume Viscocity L/min (.5 U.S. GPM) 4 cm (.44 cu. in.) mm /s (4 SSU) Phase (deg.) Min. Adjustment Frequency Response Gain (db) Frequency (Hz) Trapped Oil Volume Viscocity Min. Adjustment 6 4 Viscosity mm /s (4 SSU) vs. 8 6 Viscosity mm /s (4 SSU) EDG--H EDG--C EDG--B Phase L/min (.5 U.S. GPM) ( ) cm (.8 cu. in.) mm /s (4 SSU).5.5 EDG--H EDG--C EDG--B L /min U.S.GPM L /min U.S.GPM Gain Control vs. Input Current Viscosity vs. EDG--H EDG--C EDG--B Input Current ma L /min (.5 U.S. GPM) Oil ISO VG 46 Oil EDG--H EDG--C EDG--B C Temperature 9 4 F mm /s Viscosity SSU H E

5 List of Seals and Solenoid Ass'y Without Safety EDG- - -PNT -5/59 EDG-V- -PNT -5 EDG-- -PNT With Safety EDG- - --PNT -5/59 EDG-V- --P T -5/ List of Seals Item Name of Parts Part Numbers Qty Fastener Seal SO-NA-P6 SO-NB-P9 SO-NB-P7 SO-NB-P4 SO-NB-P8 SO-NB-A SO-NB-P SG-FCF-4 Remarks Included in Seal Kit Kit No. KS-EDG--5 Note) O-ring (Item 6, 8, ) and the fastener seal (Item ) are included in the solenoid assembly. Solenoid Ass'y Solenoid Ass'y EDG-- - -P T -5/59 EDG-- - -P T -5 E8-Y6M-8-6 EDG-V- - -P T -5/59 EDG-V- - -PNT -5 E8-Y6M-5-6 E8-Y6M-4-6 EDG-V- --PNT-597 E8-Y6M-8-6 Note) The connector assembly GDM--B- (Item ) is not included in the solenoid assembly

6 SERIES Interchangeability between Current and New EDG- series valve has changed model from 5 to 5 design in line with the solenoid improvement. Specifications and Characteristics No change in specifications and characteristics between current and new design. Mounting Interchangeability There is an interchangeability in the mounting dimensions, however, the outside shape and dimensions are changed as shown below due to solenoid improvement and other modifications. Current 5 New 5 Air Vent (.) Hex. Soc. 9.5 (7.54) 86.6 (.4) 6.5 (.4) Manual Adj. Screw (.) Hex.Soc. 9.5 (7.5) 86.7 (.4) 6.5 (.4) H E 94.5 (.7) 94.5 (.7) Manual Adj. Screw (.) Hex.Soc. Adaptor (.87) Hex. Solenoid Ass'y E E Fully Extended 7(8.54) Fully Extended 5 (.5) Air Vent (.) Hex. Soc. Places Solenoid Ass'y E Fully Extended 6(8.5) Fully Extended 5 (.5) The solenoid assembly current design comes in two types E8-5 design and 6 design. See the figure on the left for an external view of type. See the figure on the right for type. DIMENSIONS IN MILLIMETRES (INCHES)

7 Proportional Electro-Hydraulic Relief s This valve is derived by combining a small, high-performance /8 proportional electro-hydraulic pilot relief valve with a specially developed low-noise relief valve. With this valve, it is possible to regulate the system pressure in proportion to the input current. Note that this valve is used in conjunction with the applicable power amplifier. Specifications Description EBG- EBG-6 EBG- Max. Operating Pres. () 4.5 (55) 4.5 (55) 4.5 (55) Max. Flow L/min(U.S.GPM) (6.4) (5.8) 4 (6) Min. Flow L/min(U.S.GPM) (.79) (.79) (.79) Adjustment Range () Refer to Model Number ation Rated Current C 77 ma H8 ma C 75 ma H 8 ma C 7 ma H 78 ma Coil Resistance Hysteresis Repeatability Approx. Mass kg (lbs.) % or less % or less 5.6 (.) % or less % or less 6. (.9) % or less % or less () Graphic Symbols Without Safety With Safety Model Number ation F- Special Seals EB Number G Type of Mounting - -C -T -5 Size Pres. Adj. Range () Safety Number Standards F Special Seals for Phosphate Ester Type Fluid (Omit if not required) EB Proportional Electro-Hydraulic Relief G Mounting 6 C ( - 75) H ( - 55) None With Safety T Without Safety 5 Refer to. Min. adjustment pressure shall be referred to the curves on page 68.. Standards None... Japanese Standard "JIS" and European Standard 9... N. American Standard 676 Relief s