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{"title":"A4VSO71EO1\/30L-PPB13N00 A4VSO71LR2\/30L-PPB25N00 German piston bar axial","imgUrl":"https:\/\/img.chinax.com\/nimg\/35\/dd\/d32d0532f1879d4c55968ff91d80-200x200-1\/a4vso71eo1_2f30l_ppb13n00_a4vso71lr2_2f30l_ppb25n00_german_piston_bar_axial_excavator_motor_rexroth_brand_new_original_warranty_fo.jpg","attrs":{"Brand Name":"Rexroth","Model Number":"A4VSO71EO1\/30L-PPB13N00 A4VSO71LR2\/30L-PPB25N00","Certifiion":"ISO9001","Place of Origin":"German"}}
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DFR Control Explanation: DFR is a Load Sensing (LS) + Pressure Limiting (DR) control. The pump maintains a constant pressure differential (∆p, typically 14-18 bar set by internal spring) between pump outlet (P) and the Load Sense signal (LS port) from the directional valve stack — delivering only the flow demanded. A built-in pressure limiter prevents exceeding the mechanically set maximum pressure. Unlike DFR1 (externally plugged LS), DFR typically has the LS port ready for connection to the valve bank's LS line.
Frequently Asked Questions
Q1: What does "DFR" control mean and how is it different from DR, LR2, or EO1?
DFR = Load Sensing + Pressure Limiter with internal spring setting the LS differential (∆p). Requires LS line from valve bank. Most common for standard LS systems.
DR = Pressure compensator only (no LS) — pump goes to max displacement below set pressure, then de-strokes.
LR2 = Same LS+DR principle but may offer different orifice/spring options; functionally close to DFR in many cases.
EO1 = Electro-hydraulic pilot control — no internal LS spring, needs external pilot pressure.
DFR is the standard choice when you have a valve bank providing a Load Sense signal.
Q2: The rotation code is "L" (30L) — what does that mean practically?
"L" = Counter-Clockwise when viewed from the drive shaft end. This is the opposite of the more common "R" (Clockwise). The pump must be driven in this direction — running it in reverse will cause immediate failure due to loss of lubriion and improper suction. Always verify your prime mover / coupling rotates counter-clockwise from the shaft side.
Q3: What are the suction (inlet) requirements for this 500 cc pump?
With 500 cm³/rev displacement, inlet conditions are critical:
At 1200 rpm, inlet absolute pressure should be ≥ 1.0-1.2 bar (boost pump strongly recommended for sustained high-speed operation).
For speeds >1200 rpm, a dedied charge pump / supercharge circuit is essential to prevent cavitation.
Use generously sized inlet piping (≥ DN80/100), minimize elbows/restrictions, and fit a 149 µm (100 mesh) suction strainer.
Q4: Can I mount an auxiliary pump (gear pump) on the rear?
No. The suffix N00 indies no through-drive shaft. The rear of the pump housing is blanked. If you need a through-drive for a charge / pilot gear pump, select a version with a through-drive code such as K01, K02, etc.
Q5: How should the case drain (L port) be handled?
Connect one case drain port directly to the tank with a dedied line — zero backpressure (max 0.5 bar). The second drain port must be plugged. Route the drain line to above the tank oil level or provide a loop to prevent air ingestion. A blocked or pressurized drain = shaft seal failure.
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...
