Product Overview
The PVG-100-F1UV-RDFL-P-1NN/FSN-AN/1350 and PVG-130-F1UV-RGFK-P-1NN/FNN/773 are the 100 cc-class and 130 cc-class models within the Oilgear PVG series of open-loop variable displacement axial piston pumps. The PVG series features an open-loop axial piston design with a four-way pilot-operated displacement control, delivering near-instantaneous response to system commands. The compact design is made possible by Oilgear’s proprietary hydrodynamic bearing supporting the cylinder barrel, achieving a smaller installation envelope than comparable displacement pumps.
The PVG series’ core technical distinction is its “hard-on-hard” rotating system — hardened steel shoes running on a hardened swashblock surface, with hardened cylinder end face running against a hardened valve plate. This design enables PVG pumps to thrive on low-viscosity fluids and resist contamination, significantly extending maintenance intervals.
Every pump undergoes 100% simulated load testing prior to shipment, validating volumetric efficiency and variable displacement response under conditions replicating real-world duty cycles.
Model Code Breakdown (for procurement and engineering reference):
PVG: Oilgear high-performance open-loop axial piston pump series
100 / 130: Displacement class identifier, corresponding to maximum displacements of 98.3 ml/rev and 130.2 ml/rev
F1UV: F1 design series, UV seal and fluid compatibility configuration
P-1NN/FSN-AN: P-1NN single pressure compensator control with FSN load sense valve; AN supplementary configuration
P-1NN/FNN/773: P-1NN single pressure compensator control, FNN control variant, 773 factory calibration number
RDFL / RGFK: R rotation direction code, DFL/RGFK shaft and control interface combination
Technical Specifications
Model PVG-100-F1UV-RDFL-P-1NN/FSN-AN/1350:
Model Code: PVG-100-F1UV-RDFL-P-1NN/FSN-AN/1350
Series: Oilgear PVG (Open Loop)
Displacement: 98.3 ml/rev (6.00 in³/rev)
Rated Continuous Pressure: 345 bar (5000 psi)
Peak Pressure: 400 bar (5800 psi)
Maximum Speed: 2400 rpm
Theoretical Flow at 1800 rpm: 160.5 L/min (42.4 GPM)
Power Input at 1800 rpm: 111.9 kW (150 hp)
Control Type: P-1NN — Single Pressure Compensator with FSN Load Sense Valve
Mounting Flange: SAE C, 2-bolt
Shaft: R code configuration
Rotation: Bi-directional
Housing Material: High-strength cast iron / ductile iron
Weight: Approx. 52 kg (115 lbs)
Model PVG-130-F1UV-RGFK-P-1NN/FNN/773:
Model Code: PVG-130-F1UV-RGFK-P-1NN/FNN/773
Series: Oilgear PVG (Open Loop)
Displacement: 130.2 ml/rev (7.94 in³/rev)
Rated Continuous Pressure: 345 bar (5000 psi)
Peak Pressure: 400 bar (5800 psi)
Maximum Speed: 2400 rpm
Theoretical Flow at 1800 rpm: 218.0 L/min (57.6 GPM)
Power Input at 1800 rpm: 111.9 kW (150 hp)
Control Type: P-1NN — Single Pressure Compensator
Mounting Flange: SAE C, 2-bolt
Shaft: R code configuration
Rotation: Bi-directional
Housing Material: High-strength cast iron / ductile iron
Weight: Approx. 52 kg (115 lbs)
PVG Series General Specifications (Reference):
Circuit Type: Open Loop
Mounting: SAE B/C 2-bolt or 4-bolt flange
Thru-Shaft: Available for driving multiple pumps from one motor
Seal Options: Buna N, Viton, or EPR
Control Options: Pressure compensating (single/dual setting), proportional, soft start, Electronic Displacement Control (EDC), load sense, load sense with horsepower limiter, horsepower limiter, electrohydraulic with feedback, solenoid operated volume, fixed displacement
Shaft Options: 5 different shaft configurations for different torque ratings and tooth counts
Key Technical Advantages
1. Four-Way Pilot-Operated Control with Fast Response
The PVG series’ core competitive advantage is its four-way pilot-operated displacement control. Unlike conventional three-way control, four-way control allows the pump to immediately change swashblock angle upon system command, achieving near-instantaneous displacement response. The control spool’s metering areas and spring rates are precisely matched to minimize pressure overshoot and maintain stable flow output under load transients.
2. Patented Hydrodynamic Bearing Supporting Cylinder Barrel
The cylinder barrel is supported by Oilgear’s proprietary hydrodynamic bearing. During operation, a stable hydrodynamic oil film forms between the barrel and bearing, converting direct metal-to-metal contact into fluid-film lubrication that dramatically reduces friction loss and wear rates. This design enables the compact structure of PVG pumps while ensuring stable service life at 345 bar continuous pressure.
3. Hard-on-Hard Rotating System with Low-Viscosity Fluid Capability
The PVG rotating system employs a “hard-on-hard” pairing: hardened steel shoes running on a hardened swashblock surface, with hardened cylinder end face running against a hardened valve plate. All friction pairs are hardened to HRC 60 minimum, combined with precision-lapped surface roughness control to form a low-friction, high-wear-resistance sliding interface. This design allows PVG pumps to operate not only on traditional mineral oil but also on low-viscosity and low-lubricity fluids such as HFB/HFC high water-based hydraulic fluids.
4. Quiet Valve Plate Design for Low Noise Operation
The valve plate metering slots are CFD-optimized with precisely calculated pre-compression and pre-decompression angles, minimizing pressure spikes and flow pulsation during piston chamber high-to-low pressure transitions. The quiet valve plate design, combined with optimized internal housing flow passages, effectively suppresses fluid-borne noise propagation.
5. True Drop-in Interchangeability with Field-Replaceable Control Module
The PVG series is dimensionally matched to the original Oilgear PVG specification for SAE B/C mounting flange, shaft dimensions, port layout, and control module interface, achieving complete drop-in interchangeability. The control module supports field replacement without disconnecting the drive connection or system piping, significantly reducing equipment downtime and maintenance costs.
6. High-Strength Ductile Iron Housing with Wide Temperature Adaptability
The housing is precision-cast from high-strength ductile iron. The nodular graphite structure provides higher tensile strength and fatigue limit compared to flake graphite cast iron while maintaining excellent damping characteristics. The wide operating temperature range enables reliable operation in extreme-environment mobile hydraulic applications.
Application Areas
Construction Equipment: Medium excavator main hydraulic systems, wheel loader hydraulic drives, bulldozer travel circuits
Metallurgical Equipment: Coking plant coke pusher hydraulic systems, steel mill processing equipment hydraulic power sources
Mining & Drilling: Mining truck hydrostatic drives, oil rig auxiliary hydraulic systems
Metal Processing: Forging presses, die-casting machines, metal stamping production lines
Marine & Offshore: Deck machinery hydraulic drives, marine crane hydraulic systems
Industrial Hydraulic Power Units: Large presses, shears, and bending machines requiring medium-high pressure hydraulic power sources
Expert Maintenance Tips
1. Hydraulic Fluid Cleanliness
The PVG series variable control spool operates with clearances as tight as 2–5 μm and is extremely sensitive to particulate contamination. System filtration must meet ISO 4406 18/15 or better. Replace filter elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first. While the hard-on-hard rotating system offers enhanced contamination tolerance, the control valve sensitivity requires strict cleanliness management.
2. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 2 bar (0.2 MPa). The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For “drive shaft upwards” installation positions, filling and air bleeding must be completely performed to avoid dry-running risk.
3. Pre-Start Priming Procedure
Before first start, fill the pump housing with clean hydraulic fluid through the uppermost case drain port. After installation, turn the drive shaft by hand 2–3 revolutions to confirm free rotation without binding. Start at low speed with zero load and run for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load.
4. Control Module Pressure Compensator Setting
Set the P-1NN pressure compensator 15–20 bar above the maximum working load pressure, never exceeding the pump’s 345 bar continuous rating. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding. For models equipped with the FSN load sense valve (such as PVG-100-F1UV-RDFL-P-1NN/FSN-AN), the load sense differential setting must be matched to the system’s throttling valve to ensure flow control accuracy.
5. Shaft Seal and Seal Kit Preventive Replacement
Replace the main shaft seal as a preventive measure at 5 years of continuous service or 10,000 operating hours, whichever occurs first. The PVG series supports Buna N, Viton, and EPR seal material options. When replacing seals, confirm material compatibility with the system hydraulic fluid, particularly for environmentally acceptable fluids (HFB/HFC/HFD).
