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R900770685 DBW10A1-5X/350-6EG24N9K4 German made Rexroth electromagnetic relief valve
Professional electromagnetic relief valve with integrated solenoid unloading function for industrial hydraulic systems.
Technical Specifiions
Part Number
R900770685
Model
DBW 10 - A1 - 5X / 350 - 6EG24N9K4
Valve Type
Pilot-operated pressure relief valve with integrated solenoid unloading (DBW series)
Nominal Size (NG)
10 – subplate mounting per ISO 6264 / NG10
Function
Pressure limiting at set value + solenoid-actuated system unloading (energize → P→T open, system near 0 bar)
Adjustment Type
A1 = Hexagon socket with protective cap (Allen key adjustable)
Component Series
5X (series 50-59, dimensionally interchangeable)
Max. Adjustable Relief Pressure
350 bar (adjustment range typically 5-350 bar)
Max. Operating Pressure (P-port)
350 bar
Max. Flow Rate (Qmax)
approx. 250 L/min (Size 10 DB/DBW series)
Pilot Oil
Internal pilot supply, internal pilot drain (standard DBW)
Solenoid Type
Wet-pin DC solenoid
Solenoid Voltage
24 V DC (G24)
Electrical Connection
Plug-in socket per EN 175301-803 Form A (K4 = mating plug sold separately)
Manual Override
N9 = concealed push-button manual override on coil
Seal Material
NBR (standard, for mineral oil HL/HLP, HFC)
Hydraulic Fluid
Mineral oil HL, HLP per DIN 51524; HFC (water-glycol); HLPD, HVLP, HVLPD
Fluid Temperature Range
-30 °C to +80 °C (NBR seals)
Viscosity Range
10-800 mm²/s
Weight (approx.)
3.2 kg
Body Material
Cast iron / steel, zinc-plated
Product Image
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Frequently Asked Questions (FAQ)
Q1: What is the difference between DB10 and DBW10?
DB is a pilot relief valve only – limits system pressure. DBW adds an integrated directional solenoid valve: when energized the main stage is unloaded (P→T open, near 0 bar); when de-energized it works as a normal relief valve at the set pressure.
Q2: What does "A1" and "/350" mean?
• A1 = subplate mounting (NG10), adjustment by hexagon socket with protective cap (Allen key).
• /350 = spring pressure stage, maximum adjustable relief pressure = 350 bar (highest standard stage for Size 10 DB/DBW).
Q3: How do I adjust the relief pressure?
With system depressurized, remove the protective cap, turn the setscrew with an Allen key – clockwise to increase, counterclockwise to decrease. Factory preset is typically near minimum of the spring range. Reinstall cap and verify with a pressure gauge. The solenoid does NOT change the set pressure.
Q4: What is the solenoid logic?
Standard: Solenoid DE-energized = relief active at set pressure. Solenoid ENERGIZED = system unloaded (P connected to T). Confirm this matches your PLC/logic before wiring.
Q5: Which subplate and electrical connector are needed?
• Subplate: standard NG10 (ISO 6264) with P and T ports (G 1/2" or M18×1.5 on subplate), four M10 bolts @ ~35-40 N*m.
• Electrical: EN 175301-803 Form A (DIN 43650-A) 3-pin + PE connector, 24 V DC. If the plug has an LED, observe (+) / (-) polarity on the plug.
Q6: Common faults & causes?
• Solenoid clicks but no unloading: pilot orifice clogged, main spool stuck, no coil current (check ~18-28 Ω), manual override jammed.
• Pressure won't reach set value / creeps early: wrong spring (not /350), pilot damping hole blocked, contaminated pilot seat, excessive T-backpressure (internal pilot drain).
• Coil overheats / burnt smell: overvoltage (>10% above 24V), wrong voltage coil, or mechanical damage – replace only with correct G24 wet-pin coil.
• Chatter / unstable: air in system, high T-backpressure, worn pilot seat – bleed air first.
Q7: Does T-port backpressure affect set pressure?
Yes – this model has internal pilot drain. Backpressure at T adds 1:1 to the relief setpoint. If your tank line has >5 bar sustained backpressure, consider the DBW…Y version (external pilot drain to separate tank line).
Q8: Fluid & seal compatibility?
NBR seals = mineral oil (HL/HLP) & HFC (water-glycol). For HEES/HETG biodegradable oils or HFD phosphate ester → specify FKM (Viton) seal variant. Maintain oil cleanliness per ISO 4406 code 18/16/13 or better.
Need the Rexroth DB/DBW series datasheet (RE 25802) or NG10 subplate machining dimensions? Just let me know.
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...
