Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
| Delivery Time | 2 weeks |
| Payment Terms | Western Union,D/P,T/T,D/A,L/C |
| Max. Adjustable Relief Pressure | 315 bar (adjustment range typically 4–315 bar) |
| Weight (approx.) | ~7.6 kg |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Body Material | Cast iron / steel, zinc-plated |
| Packaging Details | wooden box |
| Viscosity Range | 10–800 mm²/s |
| Supply Ability | 100 |
| Place of Origin | Germany |
| Model Number | R900593530 DB20-2-5X/315 |
| Brand Name | Rexroth |
| Certification | ISO |
View Detail Information
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Product Specification
| Delivery Time | 2 weeks | Payment Terms | Western Union,D/P,T/T,D/A,L/C |
| Max. Adjustable Relief Pressure | 315 bar (adjustment range typically 4–315 bar) | Weight (approx.) | ~7.6 kg |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) | Body Material | Cast iron / steel, zinc-plated |
| Packaging Details | wooden box | Viscosity Range | 10–800 mm²/s |
| Supply Ability | 100 | Place of Origin | Germany |
| Model Number | R900593530 DB20-2-5X/315 | Brand Name | Rexroth |
| Certification | ISO | ||
| High Light | Rexroth overflow valve DB20-2-5X ，Germany made hydraulic valve ，Rexroth DB20-2-5X overflow valve | ||
|
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 |
|
Fluid Temperature Range |
-30 °C to +80 °C (NBR seals) |
|
Viscosity Range |
10–800 mm²/s |
|
Weight (approx.) |
~7.6 kg |
|
Body Material |
Cast iron / steel, zinc-plated |
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Frequently Asked Questions (FAQ)
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
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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