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Rexroth manufactures the original A4VSO355 series piston pump from Germany
Technical Specifications
Manufacturer / Series
Rexroth A4VSO Series - Swashplate Axial Piston Variable Displacement Pump, Open Circuit
Model Code
A4VSO355 DRG / 30L-PPB25N00
Size (Nominal Displacement)
355 cm³/rev (Vg max)
Circuit Type
Open Circuit
Control Type
DRG - Pressure Compensator with Remote Pressure Setting (same as DR constant-pressure control, plus pilot port X for remote cut-off pressure adjustment via external relief valve or solenoid reducing valve)
Series
30 Series
Rotation
L - Counter-Clockwise (viewed from shaft end)
Shaft
P - Metric parallel keyed shaft (DIN 6885 plain shaft with key)
P - NBR (Nitrile, for mineral oil HLP); V = FKM(Viton) for HFC-compatible versions
Nominal Pressure
350 bar (35 MPa)
Peak / Max Pressure
400 bar (40 MPa)
Max. Speed (at Vg max)
1500 rpm (A4VSO355 size)
Nominal Flow
≈ 533 L/min @ 1500 rpm (Vg max)
Min. Inlet Pressure
0.8 ~ 2 bar absolute (self-priming, avoid cavitation)
Hydraulic Fluid
Mineral oil (HL/HLP per DIN 51524); HFC only with V-seal version
Viscosity Range
10 - 1000 mm²/s (opt. 16-100 mm²/s)
Weight (approx.)
~207 kg
Origin
Germany
Code Breakdown PPB25N00: P=Keyed shaft | P=NBR seal | B=ISO 4-hole flange | 25=SAE flange side ports (vs. "13" = metric threaded) | N00=No thru-drive aux pump.
DRG = DR pressure compensator with remote pilot port (X) -- the pressure cut-off setpoint can be shifted remotely by applying pilot pressure from an external valve, while the handwheel still acts as a mechanical maximum limit stop.
Frequently Asked Questions
Q1: What is the difference between DR, DRG, and DFR1 on A4VSO pumps?
DR (this model minus G): Direct-operated pressure compensator -- cut-off pressure set mechanically only via handwheel on pump.
DRG(this model): Same pressure compensator plus remote pilot port X -- an external relief or reducing valve can set/change the cut-off pressure remotely (e.g., dual-pressure staging via solenoid), while the handwheel sets the max safety limit.
DFR1: Pressure + Flow (Load Sense) controller -- maintains constant Δp for energy-saving flow control, more complex than DR/DRG.
Choose DRG when you need remotely switchable pressure setpoints in a constant-pressure system.
Q2: This model has "L" (counter-clockwise). Can I substitute an "R" (clockwise) version?
Only if your drive motor can be reversed. "L" = CCW viewed from shaft end, "R" = CW. Pump housings and port orientations are identical, but rotation direction is not interchangeable unless you change motor rotation. Always verify motor rotation before ordering.
Q3: Does A4VSO355 require a case drain line? How to plumb it?
Yes, a case drain (housing leakage / L-port) line is mandatory. Return it directly to tank above the oil level or via a standpipe ≤ 0.5 bar backpressure. Never block it or tee into the suction line -- excessive case pressure will blow the shaft seal. Fill the case with clean hydraulic oil before first start-up.
Q4: Port code "25" vs "13" -- what's the difference and what fittings do I need?
"13" = side ports with metric BSPP (G) threads; "25" = side ports with SAE 4-bolt flanges (Pressure port typically SAE Code 61 / 6000 psi, Suction SAE Code 62 / 3000 psi). This model uses "25" -- you need SAE split-flange halves and O-rings, not threaded adaptors.
Q5: How is the remote pressure setpoint (DRG) applied?
Connect a remote pilot relief/reducing valve to the X port on the DRG controller. Pilot pressure at X maps to pump cut-off pressure per the spring ratio (typically 0-10 bar pilot = 0-350 bar pump cut-off). The mechanical handwheel on the pump sets the upper limit -- the actual cut-off is the lower of the two (handwheel limit vs. pilot-derived setpoint).
Filtration: Maintain system cleanliness ≤ NAS 9 (≈ ISO 4406 17/15/12), 10 µm or finer return/full-flow filter.
Suction: Keep inlet line short and generously sized; min. inlet pressure 0.8 bar abs; 100-150 mesh suction strainer recommended.
Alignment: Flexible coupling only -- no radial/axial shaft loads from the motor.
Bleeding: Vent pump housing and system high-points before initial run to prevent air-lock/cavitation damage.
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...
