Eaton Vickers DG3V-8 Series Overhaul Manual
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Eaton Vickers DG3V-8 Series Overhaul Manual

Directional control valves hydraulic / solenoid pilot operated
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Vickers
Overhaul Manual
Directional Controls
Directional Control Valves
DG3V-8/DG5V-8 Hydraulic/Solenoid Pilot Operated
5007.00/EN/1099/M

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Summary of Contents for Eaton Vickers DG3V-8 Series

  • Page 1 ® Vickers Overhaul Manual Directional Controls Directional Control Valves DG3V-8/DG5V-8 Hydraulic/Solenoid Pilot Operated 5007.00/EN/1099/M...

  • Page 2: Table Of Contents

    ................. . .  Eaton Hydraulics, Incorporated 2000 All Rights Reserved...

  • Page 3: Section I. Introduction

    Section I. - Introduction A. Purpose of Manual C. Model Codes Variations within each basic model series are covered in the This manual describes operational characteristics, model code. See Table 2. Each unit has a model code maintenance requirements, and overhaul information for marked on the main stage nameplate.

  • Page 4: Model Code Breakdown

    Model Code Special Seals Spool/Spring Arrangement Spool Control Modifications (Omit if not required) Spring offset to ‘A’ port (Omit if not required) F3 - Seals for fire resistant fluids Spring centered with solenoid ‘A’ 1 - Stroke adjustment (both ends) F6 - Seals for water glycol removed ( not available on D models)
  • Page 5 Model Code (continued) 21 22 Solenoid Energization Identity Coil Type Electrical Options Blank - Standard arrangement for ANSI F - Flying lead (required for wiring (Omit if not required) B93.9 (i.e. energize solenoid A to housing option) U-type coils only follow flow P to A).

  • Page 6: Section Ii. Description

    Section II. - Description A. General Directional valves are devices used to change the flow direction of fluid within a hydraulic circuit. A valve is designed to control the direction of movement of a work cylinder or the direction of rotation of a fluid motor. B.

  • Page 7: Section Iii. Valve Operation

    Section III. - Valve Operation A. General B. Type ‘1’ spool is designed with ports (P), (A) and (T) interconnected. Port (B) is blocked in center position. Directional valve operation is determined by four factors: spool type, spool positioning, method of control, and special features.
  • Page 8 2. Closed Center Spools (2, 3, 6, 31, 33, 52 and 521 types): D. Type ‘31’ spool is a type ‘3’ spool reversed in the Closed center spools are used where two or more operations bore. A type ‘31’ spool is interconnected at ports (B) and are performed by a single pump or an accumulator.
  • Page 9 3. Tandem spools (4 and 8 types): Tandem spool valves are D. Main Stage Spool Position used in hydraulic circuits where two or more hydraulic Main stage spools are positioned within the valve by special cylinders or motors are controlled from a single source of arrangements.
  • Page 10 3. Spring Offset: Single stage spring offset models use one Solenoid is spring to return the spool to an offset position. In two-stage de-energized models, the spring and washer is removed from the main stage and offset action is obtained from the pilot valve. Spring offset pilots control the main stage when the solenoid is de-energized, through spring action, so long as pilot pressure is available.
  • Page 11 5. Detent Valve Operation: Detent valve operation can be achieved by installing a detent into the pilot valve. A detent is assembled on one or both ends of the pilot spool depending on the type of pilot valve used. When a pilot valve solenoid is de-energized, the detent holds the pilot spool in the last position Main Stage...
  • Page 12 3. Reducer Module (Fig 10): The reducer module is required for piloted models when pilot pressure exceeds 210 bar (3000 psi). These two-stage spool valves maintain a reduced outlet pressure against variations in inlet pressure. These valves are able to act as relief valves (at 50% of the maximum flow) to prevent excess pressure being developed when an actuator is subject to a reactive load.

  • Page 13: Section Iv. Pilot Valve Section

    Section IV - Pilot Valve Section 1. Remote Pilot: Pilot valves, such as a DG4V-3, are available for use with a remote pilot source. This means that a valve can be shifted from a remote pressure source by other valves in the logic circuit. Refer to service parts drawing 5007.04/EN/0496/S.
  • Page 14 A. Electrical Solenoid Types Available: Two basic types A prefix of PB in the model code indicates of electrical solenoids exist:Standard and high performance. both the male plug and female receptacle are The unit nameplate identifies the type of solenoid being included with the valve.

  • Page 15: Section V. Internal Valve Functions

    Section V - Internal Valve Functions A. General To insure the proper application of a two stage valve, pilot Pilot Pressure (1000 PSIG) pressure, pilot drain and integral check valve options must –1000 be considered. The following paragraphs (B through D) Tank Line Pressure Surge (850 PSIG) –900 discuss these options.

  • Page 16: Section Vi. Installation

    Section VI - Installation A. Installation Drawings C. Piping and Tubing The installation drawings listed in Table 1 show installation 1. All pipes and tubing must be thoroughly cleaned before dimensions, port locations and operating parameters. installation. Recommended cleaning methods are Manifold, subplate and bolt kit information is also included.

  • Page 17: Section Vii. Service, Inspection & Maintenance

    Section VII - Service, Inspection & Maintenance A. Service Tools NOT use a cloth to strain the fluid or lint may enter the system. No special tools are required to service this valve series. D. Adjustments B. Inspection No periodic adjustments are required other than normal Periodic inspection of the fluid condition and tube or piping system maintenance, connections can save time consuming breakdown and...

  • Page 18: Section Viii. Overhaul

    Section VIII - Overhaul WARNING C. Pilot Valve Crossover Plate Removal Before breaking a circuit connection, ensure 1. Remove the four attaching screws (1) from the pilot valve system power is off and system pressure has or crossover plate (2). Remove the pilot valve from the been relieved.
  • Page 19 E. Pressure Centered Main Stage Disassembly 10. Remove ‘‘O’’ rings (4) and (29), set screw (5) and plug (28) from body (3). (Refer to Figure 18) 1. Remove the four attaching screws (1) from the crossover plate (2) and remove the crossover plate from the main Screw Washer stage body (3).
  • Page 20 6. Remove pilot spool (22) from body (10). Note An alternate test is to turn the body on end and allow 7. Secure the body and remove plug (24) and ‘‘O’’ Ring (25) gravity to pull the spool from the body into your hand. if from body (10).
  • Page 21 8. Install cover (6) on body (3) with four screws (5). Torque Voltage Coil Resistance the screws to value noted in parts drawing. Refer to Table 6 DC 1.3 Ohms 1. Make sure cover is oriented properly (in line with body contours).
  • Page 22 12. Install cover (14) on body (3) with four screws (13). 3. Assemble washer (19) or (20) on end of spool (22) with Torque the screws to the value noted in parts drawing. sharp break edge toward outside of body. Refer to Table 1.

  • Page 23: Dg5V-8-S/H-*(C)-10

    DG5V-8-S/H-*(C)-10 Item Nomenclature Quantity Item Nomenclature Quantity Screw ‘‘O’’ Ring Pilot Valve ‘‘O’’ Ring Body Plug Plug Screw Plug Cover Plug ‘‘O’’ Ring Plug Spring ‘‘O’’ Ring Washer ‘‘O’’ Ring Spool Figure 17. Main Stage Section, Spring Centered ‘‘C”’ Model, DG5V-*-S/H–*(C)-10...

  • Page 24: Dg3V-8

    DG3V-8-*(D)-10 Item Nomenclature Quantity Item Nomenclature Quantity Screw Centering Washer Crossover Plate ‘‘O’’ Ring Body Plug ‘‘O’’ Ring ‘‘O’’ Ring Set screw ‘‘O’’ Ring Screw Seat Cover Poppet ‘‘O’’ Ring Spring Spool ‘‘O’’ Ring Spring ‘‘O’’ Ring Sleeve ‘‘O’’ Ring Piston Rest Pin Screw...

  • Page 25: Dg4V-3(S)-*A(L)/B(L)-Fj

    DG4V-3(S)-*A(L)/B(L)-FJ/FW-60 Item Nomenclature Item Nomenclature Screw Coil Nameplate ‘‘O’’ Ring Cover ‘‘O’’ Ring Gasket Push Pin Terminal Box Spring Gasket Washer (DC models) Screw Washer (AC models) Strap Core Tube S/A Screw Spool Body Plug Screw Plug Knob ‘‘O’’ Ring ‘‘O’’...

  • Page 26: Section Ix. Internal Body Passages & Plug Locations

    Section IX - Internal Body Passages & Plug Locations Two stage directional valves can be converted to different Plug / Orifice Installation Table operational modes, i.e. internal/external, pilot pressure or DG3V-8-(R) ‘‘A’’ ‘‘B’’ Plug ‘‘C’’ Plug drain, fast response, etc. To accomplish this, internal plugs Plug/ must be removed or added within the main stage body Orifice...

  • Page 27: Section X. Start-Up And Test

    Section X - Start-Up and Test A. Start-Up B. Test Start the system and sequence the unit through all positions A test stand having regulated flow, temperature control and while watching for appropriate movement of actuators. special fixtures is required to fully test the performance of the Improper or erratic movement of the actuators may indicate rebuilt unit.

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