Eaton Vickers DG3V-8 Series Overhaul Manual Download Page 1

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5007.00/EN/1099/M

Directional Control Valves

DG3V-8/DG5V-8 Hydraulic/Solenoid Pilot Operated

Overhaul Manual

Vickers

Directional Controls

Summary of Contents for Vickers DG3V-8 Series

Page 1: ...5007 00 EN 1099 M Directional Control Valves DG3V 8 DG5V 8 Hydraulic Solenoid Pilot Operated Overhaul Manual Vickers Directional Controls...

Page 2: ...4 Section V Internal Valve Functions 17 Section VI Installation 18 Section VII Service Inspection Maintenance 19 Section VIII Overhaul 20 DG5V 8 S H C 10 20 DG3V 8 D 2 8 28 10 21 DG4V 3 S A L B L FJ F...

Page 3: ...not contained in this manual The parts and installation drawings listed in Table 1 are available from any Vickers sales engineering office C Model Codes Variations within each basic model series are c...

Page 4: ...stments both ends available on D models 7 Stroke adjusters on A port end only not available on D models 8 Stroke adjusters on B port end only available on all models 27 2 and 7 combined not available...

Page 5: ...6 3mm spade U ISO 4400 DIN 43650 X1 Flameproof solenoids BASEEFA CENELEC S piloted models only X2 Explosion proof solenoids CSA UL S piloted models only X3 Explosion proof solenoids BASEEFA ExS S pilo...

Page 6: ...o that spool position determines which ports are open or closed See Figure 1 Oil flow is directed from one port to another within the body and out of a port to the work C Two Stage Directional Valve C...

Page 7: ...essure is allowed to discharge to tank as the spool passes center condition Open center with A or B ports blocked A spool of this type is generally used to operate a cylinder When the spool is centere...

Page 8: ...d B blocked in the center position Pressure and B Closed A Open to Tank T A P B A B P T C Type 6 spool is interconnected at ports A B and T Port P is blocked in the center position Pressure Closed A B...

Page 9: ...special arrangements The four basic main stage positioning arrangements are no spring floating spring centered spring offset and pressure centered The following paragraphs 1 through 4 describe these...

Page 10: ...lot spool will shift to the right causing the main stage spool to shift left Main stage flow would then be P A and B T 1 2 Main Stage Spring Main Stage Washer T A P B T P B A A B Assume the main stage...

Page 11: ...following paragraphs 1 Stroke Limiter Adjustment Fig 8 Main stage spool travel can be limited by using stroke adjust covers Stroke adjust covers may be used on one or both ends of the main stage sect...

Page 12: ...ved larger volumes of fluid will enter the pilot valve section When the pilot valve shifts the main stage spool responds at a faster rate However this also generates transients that increase system sh...

Page 13: ...e momentarily energized to the correct position and then power may be removed from the solenoid The detent s hold the pilot spool in the last position attained until the opposite solenoid is energized...

Page 14: ...ircuits This permits electrical interlocking of various hydraulic controlled motions without resorting to external mechanical arrangements The monitor switch is a single pole double throw contact arra...

Page 15: ...e unit nameplate i e DG5V 8 S 2C T M 10 Note A 10 bar 150 PSIG nP must always be maintained to shift closed center spools A 5 bar 75 PSIG nP must always be maintained to shift open center pilot spools...

Page 16: ...bing must be thoroughly cleaned before installation Recommended cleaning methods are sandblasting wire brushing and pickling 2 To minimize flow resistance and the possibility of external leakage use o...

Page 17: ...ntenance E Replacement Parts Reliable operation throughout the specified operating range is assured only if genuine Vickers parts are used Sophisticated design processes and material are used in the m...

Page 18: ...ssary B Disassembly General The manual describes the disassembly sequence of a typical DG5V8 two stage directional valve See Figures 17 and 18 Slight variations may be noted on your model depending on...

Page 19: ...n a piece of pipe or tubing with an inside diameter that is slightly larger than the outside diameter of the seat Also obtain a flat washer Remove seat 21 Figure 15 per instructions noted in Figure 15...

Page 20: ...oving it back and forth Observe the following If the spool does not move freely the spool is sticking inside the body bore Remove the spool and recheck the spool and body bore for scratches and or bur...

Page 21: ...9 and spring 8 on end of spool 10 7 Install O ring 7 into body 3 as shown 8 Install cover 6 on body 3 with four screws 5 Torque the screws to value noted in parts drawing Refer to Table 1 Make sure c...

Page 22: ...wing Refer to Table 1 2 Lubricate pilot spool 22 then carefully install spool into the body 10 Note If pilot valve is equipped with two solenoids repeat steps 3 through 7 3 Assemble washer 19 or 20 on...

Page 23: ...em Nomenclature Quantity 1 Screw 4 11 O Ring 2 2 Pilot Valve 1 12 O Ring 4 3 Body 1 13 Pin 2 4 Plug 1 14 Plug 1 5 Screw 8 15 Plug 1 6 Cover 2 16 Plug 2 7 O Ring 2 17 Plug 8 8 Spring 2 18 O Ring 2 9 Wa...

Page 24: ...ssover Plate 1 17 O Ring 1 3 Body 1 18 Plug 4 4 O Ring 4 19 O Ring 1 5 Set screw 1 20 O Ring 1 6 Screw 4 21 Seat 1 7 Cover 1 22 Poppet 1 8 O Ring 2 23 Spring 1 9 Spool 2 24 O Ring 1 10 Spring 2 25 O R...

Page 25: ...Nameplate 1 15 O Ring 2 3 Cover 1 16 O Ring 1 4 Gasket 1 17 Push Pin 1 5 Terminal Box 1 18 Spring 1 6 Gasket 1 19 Washer DC models 2 7 Screw 2 20 Washer AC models 2 8 Strap 1 21 Core Tube S A 1 9 Scr...

Page 26: ...nternal plugs within mainstage unless power is off and system pressure is relieved Basic Model Description Ref DG3V 8 R 10 DG3V 8 R E 10 DG3V 8 R X 10 DG3V 8 R E K Q R S 10 DG3V 8 R X E K Q R S 10 DG3...

Page 27: ...ay indicate incorrect assembly of the unit or presence of trapped air B Test A test stand having regulated flow temperature control and special fixtures is required to fully test the performance of th...