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Hexagon socket setscrew with protective cap (P1X = index 1X, adjustable by Allen key)
Max. Adjustable Relief Pressure
315 bar (31.5 MPa)
Max. Operating Pressure (P-port)
630 bar
Max. Flow Rate (Qmax)
approx. 100-120 L/min (Size 10 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; HETG/HEES with compatible seals
Fluid Temperature Range
-30 °C to +80 °C (NBR seals)
Viscosity Range
10-800 mm²/s
Weight (approx.)
3.68 kg
Body Material
Steel, zinc-plated
Product Image
Related Part Numbers
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
DBDS30G1X/25 R900427243
DBDS30G1X/50 R900424262
DBDS30G1X/100 R900423763
DBDS30G1X/200 R900424281
DBDS30G1X/315 R900424261
DBDS 30 P1X/25 R900429711
DBDS 30 P1X/200 R900423714
DBDS 30 P1X/315 R900423715
Frequently Asked Questions
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.
What does "P1X / 315" mean?
P1 = adjustment type: hexagon socket with protective cap (Allen key adjustable)
1X = component series index (dimensionally interchangeable within series 1X)
/315 = spring pressure stage, maximum settable relief pressure = 315 bar
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.
Which subplate is required?
Use a standard NG10 (Size 10) subplate per ISO 6264 with P and T ports. The valve mounts via four M10 bolts (tightening torque approx. 35-40 N·m – refer to Rexroth mounting drawing). Subplate port threads are commonly G 1/2" BSP or M18×1.5.
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. Example: set to 200 bar with 20 bar T-backpressure → actual response at 220 bar. Keep T-line backpressure minimal or compensate in the setpoint.
Common fault symptoms & causes?
Pressure won't reach set value: wrong spring grade (not /315), high T-backpressure, poppet sticking due to contaminated oil, worn seating surface, or broken spring
Continuous dribble / external leak: damaged seating surface, aged O-ring, or contamination trapped in the seat – clean or replace
Chatter / noise: air in the system, flow exceeding ~120 L/min, or line resonance – bleed air and confirm flow rating
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...
