Vickers PVH74QIC-RSF-1S-10-C25-31 Variable Piston Pump 02-937934

Vickers PVH74QIC-RSF-1S-10-C25-31 Variable Displacement Piston Pump (P/N: 02-937934)

The Vickers PVH74QIC-RSF-1S-10-C25-31 (Material Number / Part Number: 02-937934) is a premium high pressure variable displacement axial piston pump, designed for heavy duty open circuit industrial and marine applications. This type has been designed as part of the Eaton Vickers PVH series for heavy-duty applications, and includes innovative “Quiet” (QI) industrial design elements, which dramatically reduce airborne noise and fluid-borne pressure ripples for smooth operation over long running cycles.

Model Details:

• Brand: Eaton Vickers / Danfoss
• Model Code: PVH74QIC-RSF-1S-10-C25-31
• Manufacturer Part Number (MPN): 02-937934
• Alternative Configuration Cross-References: 02-319014, 02-314991, PVH74QIC-RSF-1S-10-C25V-31-057, PVH74QIC-RF-1S-10-C2531

Technical Details: PVH74QIC-RSF-1S-10-C25-31

Key Features

1. Quiet Industrial (QI) Specification: Features a specialized Q250 valve plate design that dampens high-frequency operational acoustics and attenuates pressure pulsation, exceeding strict workplace noise mandates.
2. High Pressure Capability: Engineered for a 250 bar (3,625 psi) continuous duty cycles with peak rating capabilities extending up to 280 bar (4,060 psi).
3. Precision C25 Pressure Compensator: Automatically adjusts pump displacement to match system demand once the pre-set cracking pressure (adjustable between 2,000 to 3,625 psi) is achieved, reducing thermal load and parasitic power losses.
4. Optimized Valving & Internal Geometry: Incorporates a robust single one-way shaft seal (S-type) and high-load bimetallic cylinder block kit components to deliver over 94% volumetric efficiency.
5. SAE-Compliant Standardization: Standardized SAE-C 4-bolt mounting pattern and a 1-1/4 inch straight keyed shaft ensure simple direct-drive retrofitting into pre-existing prime mover frameworks.

Technical Equipment Compatibility

• The direct-drive SAE-C mechanical interface makes this pump universally compatible with standard heavy industrial hydraulic power units (HPUs) and marine equipment, including:
• Prime Movers: Standard NEMA 320T through 365TC frame electric motors, and marine auxiliary diesel engines equipped with standard SAE-C bellhousings.
• Industrial Machinery Support: Injection molding equipment (e.g., Engel, Husky, Arburg), metal forming systems, scrap metal balers, and massive metal cutting machinery.
• Marine Subsystems: Direct interface compatibility with shipboard deck cranes, steering gear power packs, mooring winches, capstans, and bow thruster pitch control systems.

Applications

• Marine & Offshore Engineering: Used in hydraulic power packs for deck cranes, cargo handling winches, watertight door systems, and deep-sea anchor windlasses.
• Industrial Manufacturing: Provides continuous fluid power for heavy-duty plastic injection molding clamping circuits, hydraulic presses, and automated stamping lines.
• Mining & Materials Handling: Operates critical actuators on underground tunneling machines, raw material conveyor lines, and heavy-duty stacker-reclaimers.
• Oil & Gas Exploration: Deployed within top-drive hydraulic systems, land-based drilling rig blow-out preventers (BOPs), and offshore umbilical power loops.

Marine Engineer Expert’s Guide

When integrating the PVH74QIC into highly restricted environments like vessel engine rooms or enclosed industrial pump rooms, fluid maintenance and case pressure optimization dictate total service life.

• Case Drain Management: Never restrict the case drain port. High case pressures degrade the Viton shaft seal lips and cause premature mechanical failure. Ensure the case drain piping routes directly to the reservoir below the minimal fluid level line without passing through any inline filters. The line diameter must match or exceed the #8 ORB port size.
• System Commissioning: Prior to initial startup, you must manual-fill the pump housing with clean, filtered system oil through the topmost case drain port. Running the pump dry for even five seconds will destroy the bimetallic piston shoe-to-yoke interfaces due to lack of hydrodynamic lubrication.
• Fluid Hygiene: Keep the hydraulic fluid within an ISO 4406 cleanliness rating of 18/15/13 or better. High-pressure piston pumps operate with precise tolerances down to the micron level; any particulate contamination will cause rapid scuffing of the cylinder barrel and swashplate faces.

Frequently Asked Questions

What does the “QIC” designation mean on the Vickers PVH74?

The QIC code indicates that this is a Quiet Industrial Configuration. It utilizes custom internal timing arrangements and specialized valve plate geometry (Q250 series) to smooth decompression cycles within the rotating group, lowering the structural noise emissions to comfortable dBA thresholds ideal for indoor plant layouts.

Can this pump operate with water-glycol or synthetic fire-resistant fluids?

Yes, but specific operational adjustments apply. Operating with high water content fluids (HFB, HFC) mandates a reduction in maximum operating speeds and down-rated system pressures (typically limited to 2,100 psi / 140 bar) to prevent cavitation and ensure structural component longevity due to reduced fluid film strength.

How do I adjust the C25 pressure compensator setting on the pump?

The pressure compensator setting can be adjusted using the hex-head regulating screw located on the control valve housing. Turning the screw clockwise increases the maximum pressure cutoff point up to the physical spring limit of 250 bar (3,625 psi), while counterclockwise rotation lowers the system pressure threshold.

Is the shaft rotation direction reversible on this model?

No. The RSF designation in the model code indicates that this pump is built specifically for Right-Hand (Clockwise) rotation, viewed from the shaft end. Running this pump counterclockwise will prevent it from priming, risk scoring internal wear surfaces, and damage the rotation-specific internal timing mechanics.