R900423731 DBDS6P1X/400 Rexroth Germany made overflow valve

Name: R900423731 DBDS6P1X/400 Rexroth Germany made overflow valve
Brand: Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.

Price Negotiable

Price: Negotiable

MOQ: 1

Delivery Time: 2 weeks

Brand: Rexroth

Product Description

R900423731 DBDS6P1X/400 Rexroth Germany Made Overflow Valve

Product Specifications

Parameter	Value
Part Number	R900423731
Model	DBDS 6 P1X / 400
Valve Type	Direct-acting seat-type pressure relief valve (DBD series)
Nominal Size (NG)	6 - subplate mounting per ISO 6264 / DIN 24340 Form A (NG6)
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. 50 L/min
Ports	2 (P → T, Pressure to Tank)
Seal Material	NBR (standard, suitable for mineral oil)
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.)	1.62 kg
Body Material	Steel, zinc-plated

Related Products

Rexroth DBDH and DBDS series pressure relief valves product line reference

DBDH 10G1X/630 R900424189
DBDH 10 P1X/100 R900423739
DBDH 10 P1X/200 R900426901
DBDH 10P1X/315 R900424186
DBDH 20 K1X/25 R900427601
DBDH 20 K1X/50 R900423028
DBDH 20 K1X/100 R900424112
DBDH 20G1X/50 R900424165
DBDH 20G1X/100 R900424108
DBDH 30 K1X/25 R900445875
DBDH 30 K1X/50 R900424193

DBDS 6 K1X/25 K900420245
DBDS 6 K1X/50 R900423727
DBDS 6 K1X/100 R900423723
DBDS 6 K1X/200 R900423724
DBDS 6 K1X/315 R900423725
DBDS6K1X/400 R900423726
DBDS6G1X/25 R900423718
DBDS6G1X/50 R900423722
DBDS6G1X/100 R900423717
DBDS6G1X/200 R900423719
DBDS6G1X/315 R900423720
DBDS6G1X/400 R900423721
DBDS6P1X/25 R900429414
DBDS6P1X/50 R900423732
DBDS6P1X/100 R900423728
DBDS 6 P1X/200 R900423729
DBDS6P1X/315 R900423730
DBDS6P1X/400 R90Q423731
DBDS 10 K1X/25 R900420276
DBDS 10 K1X/50 R900424153
DBDS 10 K1X/100 R900424147
DBDS 10 K1X/200 R900424149
DBDS 10 K1X/315 R900424150
DBDS 10 K1X/400 R900424152
DBDS 10 K1X/630 R900427601
DBDS 10G1X/25 R900423743
DBDS 10G1X/50 R900424745
DBDS 10G1X/100 R900424738
DBDS 10G1X/200 R900424140
DBDS 10G1X/315 R900424742
DBDS 10G1X/400 R900424744
DDDS 10 P1X/25 R900426905
DBDS 10 P1X/100 R900424155
DBDS 10 P1X/315 R900424158
DBDS 10 P1X/400 R900425660
DBDS 15G1X/100 R900424162
DBDS 15G1X/200 R900424163
DBDS 15G1X/315 R900424165
DBDS 20 K1X/25 R900422542
DBDS 20 K1X/50 R900424205
DBDS 20 K1X/100 R900424267
DBDS 20 K1X/315 R900424271
DBDS 20 K1X/400 R900424203
DBDS20G1X/25 R900422544
DBDS20G1X/50 R900424276
DBDS20G1X/100 R900424170
DBDS20G1X/200 R900424172
DBDS20G1X/315 R900424174
DBDS 20 P1X/100 R900424274
DBDS 20 P1X/200 R900424277
DBDS 20 P1X/315 R900424278
DBDS25G1X/25 R900433929
DBDS25G1X/100 R900424263
DBDS25G1X/200 R900424264
DBDS25G1X/315 R900424265
DBDS 30 K1X/25 R900422543
DBDS 30 K1X/50 R900424282
DBDS 30 K1X/100 R900424284
DBDS 30 K1X/200 R900424286
DBDS 30 K1X/315 R900424288

Frequently Asked Questions

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 set spring force.

Q2: What does "P1X / 400" mean?

P1 = adjustment type: hexagon socket with protective cap (Allen key adjustable)
1X = component series index (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 to the required system pressure.

Q4: Which subplate is required?

Use a standard NG6 (Size 6) subplate per ISO 6264 with P and T ports (commonly G 1/4" or M14×1.5 threaded ports on the subplate). The valve mounts flush to the subplate via four M5 bolts (tightening torque approx. 8-10 N*m — refer to Rexroth mounting drawing).

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?

Pressure won't reach set value: wrong spring grade (not /400), high T-backpressure, poppet sticking due to contaminated oil, or pump issue
Continuous dribble / external leak: damaged seating surface, worn O-ring, or contamination trapped in the seat — clean or replace
Chatter / noise: air in the system, flow exceeding 50 L/min, or excessive 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.