VICKERS Piston Pump for Railway Track Maintenance Machinery Specifications

1. Basic Specifications

• Model: VICKERS PVH74QIC, PVH074R01AA, PVM074 (main models for railway track maintenance machinery)
• Pump Type: Variable Displacement Axial Piston Pump (straight-axis design, open circuit), suitable for heavy-duty railway working conditions
• Application: Specialized for Railway Track Maintenance Machinery (rail grinding machines, track tamping machines, track lifting machines, rail straightening machines, etc.), adapted to harsh on-site conditions such as dust, vibration, and temperature changes, mainly used for hydraulic drive of key components like tamping tools, lifting mechanisms, and grinding heads
• Design Feature: High reliability and wear resistance, strong vibration resistance, low noise operation (meeting OSHA requirements), multiple optional control modes (pressure compensation, load sensing), compact structure to adapt to limited installation space of railway machinery, and service kits available for critical components to facilitate on-site maintenance
• Volumetric Efficiency: ≥95% (at rated pressure and speed), ensuring stable hydraulic power output for continuous operation of track maintenance equipment

2. Performance Parameters (Adapted for Railway Track Maintenance)

• Geometric Displacement:
  • PVH074/PVH74QIC: 73.7 cm³/rev (4.50 in³/rev)
  • PVM074: 74.0 cm³/rev (4.51 in³/rev)
• Maximum Operating Pressure:
  • Continuous Duty: 250 bar (3625 psi) (PVH series); 230-315 bar (3336-4568 psi) (PVM series)
  • Intermittent Duty: 280 bar (4050 psi) (PVH series); 280-320 bar (4061-4641 psi) (PVM series)
  • Maximum Pressure (short duration): 310 bar (4500 psi) (PVH series); 350 bar (5076 psi) (partial PVM models)
• Speed Range:
  • Maximum: 1800 rpm (at 0 inlet pressure), matching the power output of railway maintenance machinery engines
  • Minimum: 600 rpm, ensuring stable operation during low-speed maintenance operations
  • Recommended: 1200-1800 rpm for optimal performance and efficiency in continuous track maintenance tasks
• Output Flow (at 1800 rpm, no load):
  • PVH074/PVH74QIC: ~132.7 LPM (35.0 US GPM)
  • PVM074: ~133.2 LPM (35.2 US GPM)
• Fluid Requirements:
  • Fluid Types: Petroleum-based antiwear hydraulic oil (ISO VG 32, 46, 68), synthetic hydraulic fluids with anti-oxidation and anti-wear properties, adapted to temperature changes in railway field operations
  • Viscosity Range: 10-400 cSt (at operating temperature), optimal 20-60 cSt, ensuring stable operation in low-temperature and high-temperature environments
  • Inlet Pressure: -0.02 to 0.2 MPa (-0.29 to 2.9 psi); 0.48 bar (7 psi) inlet pressure is recommended to prevent cavitation under vibration conditions
• Oil Temperature Range: -20°C to 85°C ( -4°F to 185°F), adapted to outdoor low-temperature and high-temperature working environments of railway track maintenance
• Noise Level: ≤68 dB(A) (at 1800 rpm, rated pressure) for PVH series; 64-79 dB(A) for PVM series, reducing noise pollution in on-site operation

3. Installation & Structural Parameters (Suitable for Railway Machinery)

• Mounting Flange: SAE “C” 4-bolt type (SAE J744-127-4); ISO 3019/2-125B4HW (optional for PVH74QIC models), with reinforced flange design to resist vibration during machinery operation
• Shaft Rotation: Clockwise (R, standard) or Counterclockwise (L, optional) when viewed from the prime mover end, matching the rotation direction of railway maintenance machinery engines
• Shaft Extension Type:
  • Standard: 31.7 mm (1.25 in) diameter straight keyed shaft; optional 38.1 mm (1.50 in) straight keyed shaft, with high-strength steel material to resist vibration and wear
  • Optional: Splined shaft (SAE “C” 14-tooth or 17-tooth), ISO 3019/2 E32N short straight keyed shaft, suitable for high-torque transmission of track maintenance mechanisms
• Shaft Seal: Single lip seal (standard Buna N), optional double lip seal (recommended for series units and wet mounting); fluorocarbon (Viton) seal is available for high temperature and dust environments, preventing dust and moisture from entering the pump body
• Main Ports:
  • Suction Port: 2.000″ SAE 4-bolt split flange (Code 61), with anti-clogging design to adapt to field dust conditions
  • Pressure Port: 1.000″ SAE O-ring port, ensuring tight connection and preventing oil leakage under vibration
  • Drain Port: Standard SAE O-ring port (0.875-14 UNF-2B), enlarged design for better drainage in harsh environments
• Operating Weight: ~32 kg (70.5 lbs) for PVH074; ~30 kg (66.1 lbs) for PVM074, lightweight design to reduce the load of railway maintenance machinery
• Thru-Shaft Drive: Available for mounting additional pumps, with optional SAE “A”, “B”, or “C” rear flange mountings, suitable for multi-hydraulic system configuration of track maintenance machinery

4. Performance & Maintenance Parameters (Railway Specialized)

• Control Modes (Optional):
  • Pressure Compensator (C/CM/QIC): C type adjustment range 70-250 bar (1015-3625 psi); CM type adjustment range 40-130 bar (580-1885 psi); QIC type (special for railway) with stable pressure output, suitable for tamping and lifting mechanisms
  • Load Sensing (V/VT): V type pressure difference setting 20 bar (290 psi); VT type combines load sensing and torque limiter, saving energy and adapting to intermittent operation of track maintenance
  • Combined Controls: Pressure Compensator + Load Sensing (C**V), Pressure Compensator + Torque Limiter (C**T), suitable for complex hydraulic systems of track maintenance machinery
• Maximum Input Power: ~42 kW (56.3 HP) for PVH074 at 1800 rpm, 250 bar; ~40 kW (53.6 HP) for PVM074 at 1800 rpm, 230 bar, matching the power demand of railway maintenance machinery
• Oil Cleanliness Requirement: ISO 16/14/12 or cleaner, adapting to field dust environment to extend pump service life
• Filtration Recommendation: 10 μm absolute filter for pressure line, 25 μm for suction line, with anti-clogging function to prevent dust from damaging pump components
• Design Number: 10 (standard for PVH074), 15 (standard for PVM074), installation dimensions remain unchanged for design numbers 10-19 (PVH) and 15-24 (PVM), facilitating on-site replacement and maintenance
• Special Options:
  • Adjustable maximum displacement stop (S: with stop, F: without stop), only for non-thru-drive and non-torque control models, adapting to different working speeds of track maintenance mechanisms
  • Thru-shaft drive for multi-pump installations, suitable for multi-functional track maintenance machinery
  • Vibration-resistant mounting bracket, reducing the impact of machinery vibration on the pump
  • High-temperature and dust-proof seal kit, adapting to outdoor harsh working conditions of railway track maintenance

5. Model Coding Explanation (Railway Special Models)

• PVH74/PVM074: Series Identifier (PVH = high-pressure variable displacement axial piston pump; PVM = compact variable displacement axial piston pump; 74 = displacement size)
• QIC/R01: Design and Control Configuration (QIC = railway-special pressure compensation control; R01 = standard control configuration)
• RSF/AA: Mounting Flange and Shaft Type (RSF = reinforced flange + splined shaft; AA = SAE “C” flange + straight keyed shaft)
• 1S/10: Port Position and Design Number (10 = standard design number for railway models)
• C25: Pressure Compensator (C type, 250 bar setting for PVH series); C23: 230 bar setting for PVM series
• 31: Control Design Number (for C, CM, C**V, or QIC controls, adapted to railway working conditions)