Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
| Seal Material | NBR (standard, for mineral oil HL/HLP, HFC) |
| Delivery Time | 2 weeks |
| Supply Ability | 100 |
| Weight (approx.) | 7.8 kg |
| Packaging Details | wooden box |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Viscosity Range | 10–800 mm²/s |
| Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Body Material | Cast iron / steel, zinc-plated |
| Certification | ISO |
| Brand Name | Rexroth |
| Place of Origin | Germany |
| Model Number | R900941175 DBW20A1-5X/200-6EG24N9K4 |
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Product Specification
| Seal Material | NBR (standard, for mineral oil HL/HLP, HFC) | Delivery Time | 2 weeks |
| Supply Ability | 100 | Weight (approx.) | 7.8 kg |
| Packaging Details | wooden box | Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Viscosity Range | 10–800 mm²/s | Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Body Material | Cast iron / steel, zinc-plated | Certification | ISO |
| Brand Name | Rexroth | Place of Origin | Germany |
| Model Number | R900941175 DBW20A1-5X/200-6EG24N9K4 | ||
| High Light | Rexroth electromagnetic relief valve ，DBW20A1-5X hydraulic valve ，Rexroth valve with warranty | ||
|
Parameter |
Value |
|---|---|
|
Part Number |
R900941175 |
|
Model |
DBW 20 - A1 - 5X / 200 - 6EG24N9K4 |
|
Valve Type |
Pilot-operated pressure relief valve with integrated solenoid unloading (DBW series) |
|
Nominal Size (NG) |
20 — subplate mounting per ISO 6264 / NG20 |
|
Function |
Pressure limiting at set value + solenoid-actuated system unloading (energize → P→T open, system near 0 bar) |
|
Adjustment Type |
A1 = Hexagon socket setscrew with protective cap (Allen key adjustable) |
|
Component Series |
5X (series 50–59, dimensionally interchangeable) |
|
Max. Adjustable Relief Pressure |
200 bar (adjustment range typically 4–200 bar) |
|
Max. Operating Pressure (P-port) |
350 bar |
|
Max. Flow Rate (Qmax) |
approx. 500 L/min (Size 20 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.) |
7.8 kg |
|
Body Material |
Cast iron / steel, zinc-plated |
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Q1: What is the difference between DB and DBW?
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. This is the DBW (unloading) version.
Q2: What does "A1" mean and how is Size 20 different from Size 10?
A1 = subplate mounting (NG20), adjustment by hexagon socket with protective cap (Allen key).
NG20 vs NG10: Size 20 handles higher flow (~500 L/min vs ~250 L/min), uses larger M12 mounting bolts, and requires an NG20 subplate (G 3/4" or M27×2 ports). Function, solenoid, and pressure stages are the same.
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 control logic before wiring.
Q5: Which subplate and electrical connector are needed?
Subplate: standard NG20 (ISO 6264) with P and T ports (G 3/4" BSP or M27×2 on subplate), four M12 bolts @ ~70–80 N·m.
Electrical: EN 175301-803 Form A (DIN 43650-A) 3-pin + PE connector, 24 V DC. If the plug has LED indication, observe (+) / (–) polarity markings.
Q6: Common faults & causes?
Solenoid clicks but system does NOT unload: pilot orifice clogged, main spool stuck, no coil current (check coil resistance), manual override jammed.
Pressure won't reach set value / creeps early: wrong spring (not /200), pilot damping hole blocked, contaminated pilot seat, excessive T-backpressure (internal pilot drain).
Coil overheats / burnt smell: overvoltage (>10% above 24V), wrong voltage coil fitted — 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.
Company Details
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...
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