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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 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.
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...
