CNC press brakes are widely applied in new energy, construction machinery, electrical and sheet metal industries for metal plate bending and forming. High-precision bending requires hydraulic systems to realize ram synchronization control, deflection compensation, speed regulation and bending pressure holding. As the core components of high-end CNC press brakes, closed-loop proportional directional valves are mainly supplied by two mainstream brands: Rexroth and Atos, which can match press brake equipment of different tonnages and grades.
Rexroth (Highest Global Market Share for Press Brakes)
4WRA / 4WRAE – Open-loop Proportional Valves (for Low-end Machines)
Typical Models: 4WRAE6, 4WRAE10
Without LVDT spool position feedback, these valves cannot support high-precision dual-cylinder synchronization or deflection compensation. With limited accuracy and performance, they are only suitable for old-fashioned, simple low-end press brakes and have been basically phased out on high-end CNC equipment.
4WREE Series – Mainstream Universal Model (Largest Stock & First Choice for Maintenance)
Benchmark Model: 4WREE10E1-75-23/G24K31/A1V (NG10, 75L/min)
Adopting a direct-acting structure with built-in LVDT closed-loop spool feedback and an integrated OBE amplifier card, this series features stable performance and strong universality. It is widely matched with mainstream domestic CNC press brakes and small & medium-sized European and American press brakes, serving as the core model for equipment supporting and replacement maintenance. The 4WREE6 (NG6 small-flow version) is applicable for small-tonnage machines.
4WRPEH Series – New-generation Upgraded Replacement for 4WREE (Mainstream for New High-end Machines)
Reference Model: 4WRPEH6C3B40L-30/M/24F1
Equipped with a digital amplifier, this series delivers faster dynamic response and higher control accuracy, acting as a brand-new upgrade alternative to 4WREE. It has been widely adopted in new high-end press brakes at home and abroad, gradually replacing the traditional 4WREE series. Its core advantage lies in the universal mounting subplate with 4WREE, enabling convenient replacement without modifying the oil circuit. It is also the preferred model for new OEM equipment in India.
4WRKE / 4WRLE – Pilot-operated High-flow Valves (for Heavy-duty Large-tonnage Machines)
With port sizes of 16/25 and a flow rate above 200L/min, these valves are specially designed for press brakes over 200 tons to meet high-flow and high-load bending working conditions, and are rarely used on small and medium-sized press equipment.
Atos (Popular in Europe, India and Southeast Asia)
DHZO-A / DKZOR-A – Open-loop Economical Valves
Without spool position feedback, these valves offer ordinary control accuracy, only matching low-cost simple press brakes for basic low-end forming processes.
DLHZO-TE Series – Closed-loop Direct-acting Valves (Equivalent to Rexroth 4WREE)
Popular Model: DLHZO-TE-040-L71 / L73 (NG10)
Featuring a direct-acting closed-loop structure and integrated amplifier, this series achieves accuracy and stability comparable to 4WREE with outstanding cost performance. It is the standard core valve for European original press brakes and local OEM bending equipment in India.
Other Brands (Niche Applications in Press Brake Industry)
1. Argo-Hytos: PRM2-06 / PRM2-10, mainly used for niche European sheet metal equipment with low market share;
2. Parker: D3FW, D1FW series, only partially applied to high-end European and American press brakes with poor universality.
Overall Selection Summary
In general, the selection of proportional valves for CNC press brakes is mainly based on equipment tonnage, precision grade and application scenarios. Low-end simple press brakes adopt open-loop 4WRAE and DHZO-A series; most mainstream small and medium-sized CNC press brakes take Rexroth 4WREE as the core configuration, while new high-end machines are preferentially upgraded to 4WRPEH; equipment in India and Southeast Asia is mostly equipped with Atos DLHZO-TE series; heavy-duty press brakes over 200 tons require Rexroth 4WRKE/4WRLE high-flow pilot valves. Different series of proportional valves accurately meet the synchronization, positioning, speed regulation and pressure holding requirements of bending equipment at all levels, serving as the core guarantee for high-precision and high-stable operation of CNC press brakes.
