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R900593530 DB20-2-5X/315 Rexroth Germany Made Overflow Valve
Product Overview
The DB20-2-5X/315 is a high-performance pilot-operated pressure relief valve manufactured by Rexroth in Germany. Designed for industrial hydraulic systems, this valve provides precise pressure control with excellent stability and reliability.
Technical Specifications
Parameter
Value
Part Number
R900593530
Model
DB 20 - 2 - 5X / 315
Valve Type
Pilot-operated (two-stage) pressure relief valve
Nominal Size (NG)
20 – subplate mounting per ISO 6264 / NG20 (DIN 24340 Form A)
Adjustment Type
Hexagon socket sleeve with protective cap ("2" = Allen key adjustable under cap)
Component Series
5X (series 50-59, 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. 500 L/min (Size 20 DB series)
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)
Hydraulic Fluid
Mineral oil HL, HLP per DIN 51524; HFC (water-glycol); HLPD, HVLP, HVLPD
Q1: Is DB20-2-5X/315 direct-acting or pilot-operated?
It is a pilot-operated (two-stage) relief valve. The pilot valve controls pressure over the main stage spool, giving better pressure stability and lower pressure override at high flow vs. a direct-acting valve of the same size.
Q2: What does "2 - 5X / 315" mean?
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)
Q3: 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.
Q4: Which subplate is required?
Use a standard NG20 (Size 20) subplate per ISO 6264 with P and T ports. The valve mounts via four M12 bolts (tightening torque approx. 70-80 N*m). Subplate port threads are commonly G 3/4" BSP or M27×2. Optional ports X (remote pressure control) and Y (external pilot drain) are on the valve body.
Q5: Internal vs. external pilot drain – does T-backpressure matter?
This model has internal pilot drain – pilot oil returns via the T-port. Any significant backpressure at T will add to the set pressure. If your T-line has >5 bar backpressure, consider the DB…Y version (external pilot drain to a separate tank line) to avoid pressure shift.
Q6: Common fault symptoms & causes?
Pressure won't reach set value / unstable: contaminated pilot orifice/nozzle, wrong pressure stage, excessive T-backpressure (internal drain), broken pilot spring
Slow response / pressure creep: clogged pilot nozzle, air in pilot circuit
External seepage: damaged O-ring on mounting face or subplate not flat – check subplate surface and torque
Chatter: air in system, long flexible pilot lines if remotely connected, or flow near Qmax – bleed air and verify correct subplate
Q7: 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...
