Overhaul manual for Vickers DG3V-8 and DG5V-8 directional control valves covering operation, installation, service and testing.
This manual provides detailed information on the Vickers DG3V-8 and DG5V-8 series hydraulic/solenoid pilot‑operated directional control valves. It describes the valve construction, spool types, pilot valve options, and model‑code variations, and includes diagrams of internal passages and plug locations.
The document is organized into sections on valve description, operation, pilot valve features, installation, service, inspection, overhaul procedures, and start‑up testing. It also lists part numbers and provides safety warnings for handling internal components.
| Pressure rating | 350 bar (5000 psi) for all ports |
|---|---|
| Valve size | CETOP 8, NFPA D08 |
| Pilot valve type | H – CETOP 3 High performance; S – CETOP 3 Standard performance |
| Check valve pressure options | K – 0.3 bar (5 psi); Q – 2.5 bar (35 psi); R – 3.5 bar (50 psi); S – 5.0 bar (75 psi) |
The valves are rated for 350 bar (5000 psi) pressure on all ports.
Each unit has its model code marked on the main stage nameplate; the code identifies features such as pilot‑valve type, seal material and special options.
Two pilot‑valve types are offered: type H – CETOP 3 high performance and type S – CETOP 3 standard performance.
Do not change internal plugs unless power is off and system pressure is relieved.