Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
| Supply Ability | 100 |
| Max. Operating Pressure (P-port) | 630 bar |
| Packaging Details | wooden box |
| Delivery Time | 2 weeks |
| Model | DBDS 20 P1X / 400 |
| Max. Flow Rate (Qmax) | approx. 200–250 L/min (Size 20 DBD) |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Seal Material | NBR (standard, code omitted = NBR) |
| Brand Name | Rexroth |
| Certification | ISO |
| Model Number | R900424279 DBDS20P1X/400 |
| Place of Origin | German |
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Product Specification
| Supply Ability | 100 | Max. Operating Pressure (P-port) | 630 bar |
| Packaging Details | wooden box | Delivery Time | 2 weeks |
| Model | DBDS 20 P1X / 400 | Max. Flow Rate (Qmax) | approx. 200–250 L/min (Size 20 DBD) |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) | Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Seal Material | NBR (standard, code omitted = NBR) | Brand Name | Rexroth |
| Certification | ISO | Model Number | R900424279 DBDS20P1X/400 |
| Place of Origin | German | ||
| High Light | Rexroth overflow valve German made ，DBDS20P1X/400 hydraulic valve ，Rexroth hydraulic overflow valve | ||
|
Parameter |
Value |
|---|---|
|
Part Number |
R900424279 |
|
Model |
DBDS 20 P1X / 400 |
|
Valve Type |
Direct-acting seat-type pressure relief valve (DBD series) |
|
Nominal Size (NG) |
20 — subplate mounting per ISO 6264 / NG20 (DIN 24340 Form A) |
|
Adjustment Type |
Hexagon socket setscrew with protective cap (P1X = index 1X, adjustable by Allen key) |
|
Max. Adjustable Relief Pressure |
400 bar (40 MPa) |
|
Max. Operating Pressure (P-port) |
630 bar |
|
Max. Flow Rate (Qmax) |
approx. 200–250 L/min (Size 20 DBD) |
|
Ports |
2 (P → T, Pressure to Tank) |
|
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.) |
~8.1 kg |
|
Body Material |
Steel, zinc-plated |
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Q1: Is this a pilot-operated or direct-acting relief valve?
It is a direct-acting seat valve (DBD series) — no pilot stage. The spring-loaded poppet/ball opens immediately when system pressure exceeds the spring preload.
Q2: What does "P1X / 400" mean?
P1 = adjustment type: hexagon socket with protective cap (Allen key adjustable).
1X = component series index (dimensionally interchangeable within series 1X).
/400 = spring pressure stage, maximum settable relief pressure = 400 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 spring 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.
Q5: Does T-port backpressure affect the set pressure?
Yes. The spring chamber drains internally to the T-port, so any backpressure at T adds 1:1 to the relief/cracking pressure. Keep T-line backpressure minimal or compensate in the setpoint.
Q6: Common fault symptoms & causes?
Pressure won't reach set value: wrong spring grade (not /400), high T-backpressure, poppet sticking due to contaminated oil, damaged seating, or broken spring.
Continuous dribble / leak: damaged seating surface, aged O-ring, or contamination trapped in the seat — clean or replace.
Chatter / noise: air in the system, flow exceeding ~250 L/min, or line resonance — bleed air and confirm flow rating.
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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