Rexroth R900727801 Proportional Solenoid Valve – FTDRE4 K1X/30AG24C4V-8, 24V DC, Cartridge Type for Excavator Hydraulic System
Rexroth R900727801 Proportional Solenoid Valve — FTDRE4 Series Cartridge Valve
The R900727801 is a Bosch Rexroth proportional solenoid valve in the FDRE4 series, designed for precise electro-hydraulic control in mobile and industrial applications. It is a screw-in cartridge valve with an integrated 24V DC solenoid coil, commonly used in excavator hydraulic systems for flow and pressure modulation.
Confirmed Specifications
Part number / full model: R900727801 / FTDRE 4 K1X/30AG24C4V-8 (also referenced as FDRE4 K1A/30-8)
Valve type: Hydraulic proportional solenoid valve, cartridge type (screw-in)
Operating voltage: 24V DC
Current rating: 0.8 A
Power consumption: 21 W (for R900727801 specifically; sister model R900701407 is 18 W)
Cavity / thread: M18×1.5
Seals: FKM (green O-ring per some listings)
Weight: approximately 0.2 kg
Country of origin: Germany (per one distributor listing; verify with supplier)
Specifications Requiring Verification
Two aftermarket listings provide conflicting/overlapping data for the broader part number group (including R900727801):
Operating pressure: 100–210 bar (one listing) vs. up to 400 bar (another, for DX-series valves)
Max flow: 2–7 L/min (one listing)
These figures may apply to a sister model or a different application context. Confirm pressure and flow ratings against the physical valve nameplate or Rexroth official datasheet before ordering.
Application Context
This valve is primarily associated with excavator hydraulic systems, including Lonking 6365H and Doosan DX-series machinery. It functions as a proportional control element, regulating volume flow direction and quantity in response to an electrical signal, enabling precise movement of hydraulic actuators.
Ordering Notes
Verify whether the unit is genuine Rexroth (Germany) or an aftermarket replacement—listings exist for both, with significant price differences.
Confirm coil voltage (24V DC) and connector type match your machine’s harness.
Request the exact full model string (FTDRE 4 K1X/30AG24C4V-8) on the quotation to avoid substitution.
