A4VSO250DRG/30L-PPB13N00 Rexroth Germany original A4VSO250 series hydraulic piston pump
Price:
Negotiable
MOQ:
1
Delivery Time:
2 weeks
Brand:
Rexroth
Product Description
A4VSO250DRG/30L-PPB13N00 Rexroth Germany Original A4VSO250 Series Hydraulic Piston Pump
A4VSO250DRG/30L-PPB13N00 — Variable Displacement Axial Piston Pump (A4VSO Series, Open Circuit)
Important: A4VSO is a hydraulic pump (not a motor) for mineral oil hydraulic systems only. It cannot pump water and must not be run dry or in reverse rotation.
Parameter Specification Table
| Parameter Category | Parameter | Specification / Description |
|---|---|---|
| General Information | Manufacturer / Series | Rexroth (Germany), A4VSO Open Circuit Variable Axial Piston Pump |
| Full Model Code | A4VSO250DRG/30L-PPB13N00 | |
| Functional Summary | 250 cm³ displacement • DRG Pressure Compensator w/ Remote Pilot Option • CCW Rotation • PPB13 Ports • No Through-Drive | |
| Hydraulic Performance | Geometric Displacement | 250 cm³/rev (≈ 15.3 in³/rev) |
| Nominal Continuous Pressure | 350 bar (≈ 5075 psi) | |
| Peak Intermittent Pressure | 400 bar (≈ 5800 psi) | |
| Recommended Speed Range | 1000 - 1500 rpm (Max ~1800 rpm subject to inlet conditions) | |
| Theoretical Flow @ 1500 rpm | 250 × 1500 ÷ 1000 = 375 L/min | |
| Control Type |
DRG — Pressure Compensator (Constant Pressure Control) with Remote Pilot Port (X): • Local mechanical screw sets max pressure • Port X accepts external pilot pressure to reduce/override setpoint • Below set pressure → full displacement; at set pressure → de-strokes to maintain pressure |
|
| Mechanical Interface | Shaft Type | Parallel Key Shaft (DIN 6885) |
| Rotation Direction | L = Counter-Clockwise (CCW) — viewed from shaft end | |
| Mounting Flange | ISO 3019-2 (4-bolt, metric) | |
| Port Configuration | PPB13: SAE flanged ports, metric screws, Series 13 port plate | |
| Through Drive | N00 = No through-drive (cannot mount auxiliary pump on rear) | |
| Seals & Media | Seal Material | NBR (Nitrile Rubber) — standard for mineral oil |
| Compatible Fluids | Mineral oils (HL/HLP), HFC (Water Glycol with derating); NOT HFD unless FKM-sealed | |
| Oil Temperature Range | −20 °C to +70 °C (with NBR seals) | |
| Fluid Cleanliness Required | ISO 4406 17/15/12 or cleaner (NAS 1638 Class 7 equivalent) | |
| Physical Data | Approximate Weight | 135 kg |
| Case Drain Ports | 2 × G1/2 (use one to tank, plug the other; backpressure ≤ 0.5 bar) | |
| Recommended Suction Line | ≥ DN50/DN65, short & straight, with 100 mesh (149 µm) suction strainer | |
Model Code Breakdown
A4VSO 250 DRG / 30 L - PPB13 N00
│ │ │ │ │ │ └── No through-drive
│ │ │ │ │ └── PPB13: SAE flanged / metric screws / Series 13
│ │ │ │ └── L: Counter-Clockwise (CCW) viewed from shaft end
│ │ │ └── 30: Series code (size group / design generation)
│ │ └── DRG: Pressure Compensator + Remote Pilot Port X (local adj. sets max; pilot can lower it)
│ └── 250 cm³/rev geometric displacement
└── A4VSO: Open Circuit Variable Axial Piston Pump (Heavy-Duty Industrial)
│ │ │ │ │ │ └── No through-drive
│ │ │ │ │ └── PPB13: SAE flanged / metric screws / Series 13
│ │ │ │ └── L: Counter-Clockwise (CCW) viewed from shaft end
│ │ │ └── 30: Series code (size group / design generation)
│ │ └── DRG: Pressure Compensator + Remote Pilot Port X (local adj. sets max; pilot can lower it)
│ └── 250 cm³/rev geometric displacement
└── A4VSO: Open Circuit Variable Axial Piston Pump (Heavy-Duty Industrial)
Frequently Asked Questions (In-Depth)
Q1: What is "DRG" control and how is it different from plain "DR" or "DFR"?
A:
- DR (basic): Pressure compensator with local mechanical adjustment only. Set screw determines the cutoff pressure; no external influence possible.
- DRG (this model): Same pressure compensator PLUS a pilot port (X). The local screw sets the maximum pressure; an external pilot signal can reduce the effective setting — i.e., pilot pressure at X subtracts from the local spring setting. Useful when you need to change the pump's pressure cap electrically/pneumatically or from a remote station.
- DFR / LR2: Adds Load Sensing (LS) function — pump tracks valve-bank LS signal with a fixed ∆p. DRG has no LS; it's purely a remotely-influenceable pressure limiter.
- When to choose DRG: You need a simple pressure-limited pump but also want the ability to remotely lower/modulate the pressure setpoint without a full LS setup.
- DR (basic): Pressure compensator with local mechanical adjustment only. Set screw determines the cutoff pressure; no external influence possible.
- DRG (this model): Same pressure compensator PLUS a pilot port (X). The local screw sets the maximum pressure; an external pilot signal can reduce the effective setting — i.e., pilot pressure at X subtracts from the local spring setting. Useful when you need to change the pump's pressure cap electrically/pneumatically or from a remote station.
- DFR / LR2: Adds Load Sensing (LS) function — pump tracks valve-bank LS signal with a fixed ∆p. DRG has no LS; it's purely a remotely-influenceable pressure limiter.
- When to choose DRG: You need a simple pressure-limited pump but also want the ability to remotely lower/modulate the pressure setpoint without a full LS setup.
Q2: The rotation code is "L" (30L) — how do I verify and what if it's wrong?
A:
- L = Counter-Clockwise (CCW): Face the drive shaft end (coupling side looking into the pump); the shaft must rotate counter-clockwise.
- Check motor rotation arrow or perform a brief jog test before final coupling.
- Running in reverse on an L pump:
- L = Counter-Clockwise (CCW): Face the drive shaft end (coupling side looking into the pump); the shaft must rotate counter-clockwise.
- Check motor rotation arrow or perform a brief jog test before final coupling.
- Running in reverse on an L pump:
- Port plate suction/pressure windows are asymmetrical → suction failure → cavitation/seizure
- Internal lubrication galleries are directional → immediate loss of lube film
- Damage is near-instantaneous → total pump destruction
- Correct by re-phasing motor or ordering an "R" (clockwise) version — never force reverse run
Q3: What are the suction (inlet) requirements for this 250 cc pump?
A:
1. Minimum absolute inlet pressure ≥ 0.8 bar (gauge ≈ −0.2 bar vacuum max).
2. For sustained 1500+ rpm, a boost pump providing 1.0-1.5 bar positive head is recommended for margin.
3. Suction line:
Cavitation symptoms: high-pitched whine, valve plate pitting, flow drop, premature bearing failure.
1. Minimum absolute inlet pressure ≥ 0.8 bar (gauge ≈ −0.2 bar vacuum max).
2. For sustained 1500+ rpm, a boost pump providing 1.0-1.5 bar positive head is recommended for margin.
3. Suction line:
- Inner diameter ≥ DN50 (DN65 preferred)
- Length as short as possible (< 1.5 m), minimize elbows
- 100 mesh (149 µm) suction strainer with < 0.05 bar pressure drop
Cavitation symptoms: high-pitched whine, valve plate pitting, flow drop, premature bearing failure.
Q4: Can I mount a gear pump on the rear for charge/pilot pressure?
A: No. The suffix N00 = no through-drive shaft. Rear housing is blanked. If you need a through-drive for an auxiliary pump, select a version with through-drive code such as K01, K02, K51, etc. For DRG you typically still need a separate pilot pressure source for port X if remote control is used.
Q5: How must the case drain (L port) be plumbed?
A:
- Connect one case drain port via a dedicated line directly to the tank (above oil level or looped to prevent siphon).
- Backpressure ≤ 0.5 bar (ideally 0 bar). Plug the unused drain port.
- Never: block it, tie it into a pressurized return line, or share a small-bore return with other valves.
- Result of neglect: Housing pressurizes → shaft seal blowout, valve plate distortion, bearing overheating → pump fails.
- Connect one case drain port via a dedicated line directly to the tank (above oil level or looped to prevent siphon).
- Backpressure ≤ 0.5 bar (ideally 0 bar). Plug the unused drain port.
- Never: block it, tie it into a pressurized return line, or share a small-bore return with other valves.
- Result of neglect: Housing pressurizes → shaft seal blowout, valve plate distortion, bearing overheating → pump fails.
Q6: What drive motor power is required?
A: At 350 bar / 1500 rpm / full displacement:
- Hydraulic power Pₕ = (250 × 10⁻⁶ × 350 × 1500) ÷ 600 ≈ 219 kW
- With ηₘₑcₕ ≈ 0.90 → shaft input ≈ 243 kW
➡ Recommended drive: 250 kW (≈335 HP) electric motor, S1 duty, with adequate starting torque for 400 bar peak. Avoid prolonged operation below ~750 rpm minimum continuous speed.
- Hydraulic power Pₕ = (250 × 10⁻⁶ × 350 × 1500) ÷ 600 ≈ 219 kW
- With ηₘₑcₕ ≈ 0.90 → shaft input ≈ 243 kW
➡ Recommended drive: 250 kW (≈335 HP) electric motor, S1 duty, with adequate starting torque for 400 bar peak. Avoid prolonged operation below ~750 rpm minimum continuous speed.
Q7: Are NBR seals OK with HFC or HFD fluids?
A:
- ✅ HFC (Water Glycol): NBR acceptable with pressure/temperature derating per Rexroth (typically ×0.8 pressure factor, watch Tmax).
- ❌ HFD (Phosphate Ester): NBR will swell → must specify FKM (Viton) seal version (/V suffix or explicit FKM option).
- Standard mineral oil (HL/HLP) → no issue with NBR.
- ✅ HFC (Water Glycol): NBR acceptable with pressure/temperature derating per Rexroth (typically ×0.8 pressure factor, watch Tmax).
- ❌ HFD (Phosphate Ester): NBR will swell → must specify FKM (Viton) seal version (/V suffix or explicit FKM option).
- Standard mineral oil (HL/HLP) → no issue with NBR.
Q8: What are the key commissioning steps?
A:
1. Fill & bleed: Loosen case drain and HP port bleed screw. Hand-rotate shaft while filling till oil flows bubble-free.
2. Verify case drain line is open to tank.
3. Jog-test rotation — confirm CCW (L), no abnormal noise.
4. Low-pressure run-in: Back off DR adjustment screw (minimum pressure); run briefly to purge air from system and lines.
5. Set pressure: Slowly turn DR screw clockwise to desired max pressure. If using pilot port X, verify remote lowering function.
6. Lock & document: Tighten lock nut on DR adjuster; record both local and (if applicable) pilot-influenced settings.
1. Fill & bleed: Loosen case drain and HP port bleed screw. Hand-rotate shaft while filling till oil flows bubble-free.
2. Verify case drain line is open to tank.
3. Jog-test rotation — confirm CCW (L), no abnormal noise.
4. Low-pressure run-in: Back off DR adjustment screw (minimum pressure); run briefly to purge air from system and lines.
5. Set pressure: Slowly turn DR screw clockwise to desired max pressure. If using pilot port X, verify remote lowering function.
6. Lock & document: Tighten lock nut on DR adjuster; record both local and (if applicable) pilot-influenced settings.
Similar Products
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
Location
Nan'an, Fujian Province, China
Contact Person
liyun