R900920619 DBW20B1-5X/315-6EG24N9K4 Electromagnetic overflow valve from Rexroth, Germany
Price:
Negotiable
MOQ:
1
Delivery Time:
2 weeks
Brand:
Rexroth
Product Description
R900920619 DBW20B1-5X/315-6EG24N9K4 Electromagnetic Overflow Valve
Product Overview
Rexroth DBW20B1-5X/315-6EG24N9K4 — Pilot-Operated Solenoid Relief Valve with integrated solenoid unloading functionality. Designed for precise pressure control and system unloading in industrial hydraulic applications.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | R900920619 |
| Model | DBW 20 - B1 - 5X / 315 - 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 | B1 = Hexagon socket setscrew with protective cap (Allen key adjustable) |
| Component Series | 5X (series 50-59, dimensionally interchangeable) |
| Max. Adjustable Relief Pressure | 315 bar (adjustment range typically 4-315 bar) |
| Max. Operating Pressure (P-port) | 350 bar |
| Max. Flow Rate (Qmax) | approx. 500 L/min (Size 20 DB/DBW series) |
| 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) |
| Weight (approx.) | 7.95 kg |
Product Image
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Frequently Asked Questions
Q1: What is the difference between A1 and B1 versions (DBW20A1 vs DBW20B1)?
Both are subplate-mounted pilot relief valves with solenoid unload and identical adjustment method. The B1 version has a different pilot-stage damping orifice — it provides slightly different dynamic response (pressure overshoot/settling) vs A1. Pressure range, flow rating, solenoid, and mounting are identical.
Q2: Is this direct-acting or pilot-operated?
It is a pilot-operated (two-stage) relief valve with solenoid unloading. A pilot stage controls the main spool for stable high-flow relief; the integrated solenoid can command the valve to dump system pressure to tank.
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.
Q4: What is the solenoid logic?
Standard: Solenoid DE-energized = relief active at set pressure. Solenoid ENERGIZED = system unloaded (P connected to T, near tank pressure). 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
- Electrical: EN 175301-803 Form A (DIN 43650-A) 3-pin + PE connector, 24 V DC
Q6: Common faults & causes?
- Solenoid clicks but system does NOT unload: pilot orifice clogged, main spool stuck, no coil current
- Pressure won't reach set value / creeps early: wrong spring, pilot damping hole blocked, contaminated pilot seat
- Coil overheats / burnt smell: overvoltage, wrong voltage coil fitted
- Chatter / unstable: air in system, high T-backpressure, worn pilot seat
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.
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Company
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
Location
Nan'an, Fujian Province, China
Contact Person
liyun