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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; B-version has different pilot damping orifice vs A-version)
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.)
7.9 kg
Body Material
Cast iron / steel, zinc-plated
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 (hex socket + cap). 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. A1 is the general-purpose default; B1 is selected when system stability/damping tuning is required.
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. 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, 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 (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 indiion, observe (+) / (-) polarity markings
Q6: Common faults & causes?
Solenoid clicks but system does NOT unload: 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 /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
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...
