Directional control valves from Cetop 3 to Cetop 8

A directional control valve decides where the oil goes: it starts, stops and reverses the movement of cylinders and motors by connecting the pump and tank to the working lines. It is the most common valve in any hydraulic circuit, from presses and machine tools to mobile machines.

The Hydraut range covers on/off directional valves from Cetop 3 to Cetop 8, with Huade series for every type of actuation: solenoid, hydraulic or pneumatic pilot, manual lever and mechanical.

Range and Rexroth reference series

An alternative to Rexroth directional valves

All series use the standard ISO 4401 (Cetop) mounting interfaces, so they fit the subplates and manifolds already on your machine. Huade has built valves under Rexroth technology licence since 1981, which is why its series carry the same designations as the Rexroth reference series.

• Huade series: a recognised manufacturer brand, assembled and tested in Italy, 24-month warranty.
• Delivery: 24–48 hours for stock items, 2 weeks standard.

How to choose a directional valve

1. Actuation

Solenoid valves (HD-WE) are the standard for automated machines. Hydraulic or pneumatic pilot valves (HD-WH) work without electrical supply; manual lever (HD-WMM) and mechanical valves (HD-WMU/R, actuated by a cam or a moving part of the machine) are used for manual commands, safety functions and end-of-stroke logic.

2. Size and flow

The Cetop size defines the mounting interface and the flow the valve can handle: Cetop 3 (NG6) up to about 80 l/min, Cetop 5 (NG10) up to 120 l/min. The larger Cetop 7 and Cetop 8 sizes are available in the manual lever version HD-WMM.

3. Spool and configuration

4/3 valves have three positions (two working positions and a centre position whose spool defines what happens at rest: all ports blocked, P to T open, A and B to T); 4/2 valves have two. The return can be by spring (automatic centre), detent (holds the last position) or without spring.

4. Leak-free blocking

Spool valves always have a small internal leakage. If a load must be held with the pump off, choose a poppet seat valve such as the HD-M-SED, which seals without leakage up to 350 bar.

5. Voltage and connector

Check the coil voltage (AC or DC), the connector and the need for a manual override.