R901029969 Rexroth DBETE-6X/315G24K31A1V Proportional Pressure Relief Valve NG6 315 Bar 24VDC

2.1 LVDT Feedback + Integrated Electronics – The Closed-Loop Advantage

The single most important selection decision between DBETE and DBET is the feedback architecture. This is not a minor specification difference - it changes how the valve behaves in your system.

When to choose DBETE: If your application requires consistent pressure from cycle to cycle - injection molding where shot quality depends on repeatable hold pressure, or test rigs where pressure must be precisely maintained at a programmed value - the LVDT feedback in DBETE delivers measurable improvements in process stability.

When DBET is sufficient: If your application tolerates slightly higher hysteresis and you have available panel space for an external amplifier, DBET offers a lower system cost.

2.2 Pressure Grade Selection – Match the Valve to Your System

The DBETE-6X is available in six pressure grades. Choosing the right one affects control resolution and cost:

Selection rule: Choose the lowest pressure grade that meets your system's maximum working pressure. A lower-rated valve provides better control resolution - a 50 bar change in command signal produces a proportionally smaller pressure change on a 315 bar valve than on a 420 bar valve. If your system operates at 250 bar, the 315 bar grade is the appropriate choice - it provides adequate margin without sacrificing control precision.

2.3 Integrated Electronics – No External Amplifier, Simpler Installation

The OBE (On-Board Electronics) in the DBETE-6X means the valve amplifier is built into the valve itself. The command signal (0-10V or 4-20mA) and supply voltage (24 VDC) connect directly to the valve connector.

What this means for your control cabinet:

No external amplifier module - saves panel space (typically 40-80 mm per valve)

No amplifier-to-valve wiring - eliminates a potential noise pickup point

Simpler commissioning - factory-calibrated command-value-to-pressure curve

Fewer components - one less item in the bill of materials

For systems with multiple proportional valves: The cumulative cabinet space savings and wiring reduction can be substantial. A machine with four proportional pressure valves using DBETE saves roughly 160-320 mm of panel width compared to the DBET configuration.

2.4 Seat Design – Zero Leakage at Set Pressure

The DBETE-6X uses a seat design (valve poppet + valve seat) rather than a spool design. In a seat-design valve, the poppet seals against the seat with metal-to-metal contact when the system pressure is at or below the set pressure.

Practical benefit: There is no leakage through the valve when the system pressure is below the setpoint. In applications where the relief valve is used for pressure limitation (as opposed to continuous bypass flow), the seat design ensures that no hydraulic fluid is wasted through the valve during normal operation - all flow goes to the actuators.

2.5 Seal and Fluid Compatibility – FKM Standard

The "V" suffix in the model code indicates FKM (Viton) seals - the standard configuration for the DBETE-6X. FKM is compatible with:

Mineral oil - HL, HLP, HLPD, HVLP, HVLPD

Environmentally acceptable fluids - HETG, HEES, HEPG

Fire-resistant fluids - HFDU, HFDR

For systems using NBR-compatible fluids or where FKM is not required, confirm with your supplier whether an NBR option is available.

2.6 Remote Control Capability – Adjust Pressure from the PLC

The DBETE-6X is designed as a remote control valve. The pressure setpoint is not adjusted by a manual handwheel on the valve - it is set by an analog command signal from your control system.

What this enables:

Process recipes - different pressure profiles for different products, switched by PLC

Remote adjustment - pressure changes without accessing the valve

Closed-loop control - integrate with pressure sensors for precise regulation

Safety functions - electronically limit maximum system pressure under all conditions

For injection molding machines, this means variable injection and hold pressure profiles programmed into the machine controller. For presses, it means variable press force for different workpiece requirements.