R900424279 DBDS20P1X/400 German made Rexroth overflow valve

Name: R900424279 DBDS20P1X/400 German made Rexroth overflow valve
Brand: Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.

Price Negotiable

Price: Negotiable

MOQ: 1

Delivery Time: 2 weeks

Brand: Rexroth

Product Description

R900424279 DBDS20P1X/400 German made Rexroth overflow valve

Product Overview

Rexroth DBDS20P1X/400 — Direct-Acting Pressure Relief Valve (P/N: R900424279)

Technical Specifications

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

Rexroth DBDS20P1X/400 Pressure Relief Valve

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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 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.