Technical manual for Vickers KDG4V-3S and KTG4V-3S proportional valves covering specifications, installation, wiring and operation.
This manual describes the Vickers KDG4V-3S (directional) and KTG4V-3S (throttle) proportional valves. It explains the valve functions, typical applications, and how the electromagnetic coils control flow proportionally to current.
The document provides detailed technical specifications, recommended hydraulic fluids, installation dimensions, electrical connection diagrams, and maintenance guidelines to help engineers select, install, and service the valves in hydraulic systems. This manual is written in Chinese.
| Maximum working pressure (A, B, P ports) | 350 bar (5000 psi) |
|---|---|
| Maximum tank pressure (T port) | 100 bar (1450 psi) |
| Coil resistance (20 °C) | G 1.8 Ω, H 7.3 Ω, GP 4.9 Ω, HA 19.6 Ω |
| Coil inductance (1000 Hz) | G 7.5 mH, H 29 mH, GP 16 mH, HA 67 mH |
| Step response time (0–100 % travel) | 100 ms |
| Recommended hydraulic fluid | Petroleum‑based oil; fluorocarbon seals standard |
| Weight (approx.) | KDG4V‑3S 2.3 kg (5.06 lb), KTG4V‑3S 1.75 kg (3.85 lb) |
The valves can handle up to 350 bar (5000 psi) at the A, B, and P ports.
Petroleum‑based hydraulic oil is recommended; the standard seals are fluorocarbon compatible.
The step response from 0 % to 100 % valve travel is about 100 ms.