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R900590334 DB10-2-5X/315 German Rexroth Overflow Valve
Product Overview
The DB10-2-5X/315 is a pilot-operated two-stage pressure relief valve from German manufacturer Rexroth, designed for precise pressure control in hydraulic systems with maximum operating pressures up to 350 bar.
Technical Specifiions
Parameter
Value
Part Number
R900590334
Model
DB 10 - 2 - 5X / 315
Valve Type
Pilot-operated (two-stage) pressure relief valve
Nominal Size (NG)
10 – subplate mounting per ISO 6264 (NG10 / DIN 24340 Form A)
Adjustment Type
Hexagon socket sleeve with protective cap ("2" = Allen key adjustable under cap)
Component Series
5X (series 50-59, mounting/interchangeable within 5X range)
Max. Adjustable Relief Pressure
315 bar (adjustment range typically 4-315 bar)
Max. Operating Pressure (P / X port)
350 bar
Max. Operating Pressure (T port)
315 bar
Max. Flow Rate (Qmax)
approx. 250 L/min (subplate mounted)
Ports
2 (P → T, Pressure to Tank)
Pilot Oil Supply / Drain
Internal pilot supply, internal pilot drain (standard DB type)
Seal Material
NBR (standard, code omitted = NBR, for mineral oil & HFC)
Hydraulic Fluid
Mineral oil HL, HLP per DIN 51524; HFC (water-glycol); HLPD, HVLP, HVLPD
It is a pilot-operated (two-stage) relief valve. A small direct-acting pilot valve controls pressure over the main stage spool, giving better pressure stability and lower pressure override at high flow compared to a direct-acting valve of the same size.
What does "2 - 5X / 315" mean in the model?
2 = adjustment type: hexagon socket with protective cap (Allen key adjustable)
5X = component series index 5X (dimensions fixed within series 50-59)
/315 = pressure stage, maximum adjustable relief pressure = 315 bar (adjustable roughly 4-315 bar)
How do I adjust the relief pressure?
Depressurize the system, remove the protective cap, turn the internal setscrew with an Allen key – clockwise to increase, counterclockwise to decrease. Reinstall the cap and verify with a pressure gauge at the P-port. Factory preset is typically near the low end of the range; always adjust on-site.
Which subplate is required?
Use a standard NG10 (Size 10) subplate per ISO 6264 with P and T ports. The valve mounts via four M10 bolts (tightening torque approx. 35-40 N*m). Subplate port threads are commonly G 1/2" BSP or M18×1.5. Optional port X (pilot remote control) and Y (external pilot drain) are available on the valve body if remote control or external drain is needed.
What is the difference between internal and external pilot drain?
This model has internal pilot drain (standard DB type) – pilot oil returns to tank via the T-port internally. If there is significant backpressure on T, consider the DB…Y version (external pilot drain to tank) to prevent backpressure from affecting the set pressure.
Common fault symptoms & causes?
Pressure won't reach set value / unstable: contaminated pilot orifice/nozzle, wrong pressure stage, excessive T-backpressure (on internal drain version), or broken pilot spring
Slow response / pressure creep: clogged pilot line/nozzle, air in pilot circuit
External leak / dribble: damaged O-ring on mounting face, contaminated pilot seat – check subplate flatness and O-ring condition
Chatter: air in the system, excessively long pilot lines if remotely connected, or flow near Qmax – bleed air and verify proper subplate installation
Fluid & seal compatibility?
Standard NBR seals suit mineral oil (HL/HLP) and HFC (water-glycol). For HEES/HETG biodegradable oils or HFD phosphate ester, FKM (Viton) seals are required – order the "V" seal variant if needed.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
