Oilgear PVM

Product Overview

Key Advantages

• Hard-on-Hard Technology & Polymerous Bearings: Incorporates hardened running surfaces paired with one-piece polymerous hydrodynamic journal bearings. This configuration eliminates traditional mechanical yoke bearings, ensuring exceptionally low hysteresis, superior contamination resistance, and full compatibility with low-viscosity or low-lubricity fluids.
• Fast Control Response: Features a fast shift valve design and meter-out pressure-compensated, load-sensing controls that assist the pump in rapidly returning to stroke, providing instantaneous displacement control under dynamic load shifts.
• Low Noise & Compact Modular Footprint: Utilizes a quiet port plate design to minimize acoustic emissions at standard electric motor speeds while maintaining full through-shaft torque capabilities in a unitized nodular iron housing.

Technical Specifications

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Configuration Options

• Housing Structure: Unitized one-piece nodular iron housing with O-ring static seals to eliminate external gasket leak paths. Dual case drain ports permit flexible mounting orientations.
• Control Types: Single or dual-stage pressure compensator (P-1NN), load-sensing control with pressure override (P-1NN/J), bleed-off load-sensing control (P-1NN/B), proportional electrohydraulic pressure compensator, and inverse proportional electrohydraulic control.
• Feedback Systems: Mechanical swashplate position feedback, load-sensing hydraulic differential signaling, or LVDT electronic position feedback for closed-loop control integration.
• Drive Shaft Options: Heavy-duty SAE splined shafts or keyed cylindrical shafts designed for high through-torque pass-through configurations.
• Mounting Standards: SAE 2-bolt and 4-bolt standard flange mountings conforming to SAE A, B, and C interfaces.
• Fluid Port Connections: SAE O-ring boss or SAE 4-bolt split flange ports available in top/bottom, side, or rear porting configurations.​​​​​​​

Key Materials and Components

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• Nodular Cast Iron Housing: High-tensile ductile iron casting provides exceptional rigidity, damping operational noise, and preventing casing flex under peak pressure spikes.
• Polymerous Journal Bearings: Proprietary polymer-matrix composite swashblock and journal bearings eliminate metal-to-metal contact, enabling wear-free operation even when using low-lubricity fluids or water-glycol mixtures.
• Hardened Alloy Steel Cylinder Block & Pistons: Hard-on-hard surface treatment applied to the piston assembly and valve plate, reducing micro-galling and resisting particulate contamination.
• Fluorocarbon (FKM / Viton) Seals: High-temperature, chemical-resistant elastomeric seals standard across all mating joints and shaft output seals to handle synthetic or high-water fluids.

Packaging and Transport Protection

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• Industrial Packaging: Heavy-duty corrugated outer cartons reinforced with internal wooden crating for multi-unit bulk orders.
• Moisture Defense: Sealed within anti-static, vapor corrosion inhibitor (VCI) vacuum bags containing desiccant packs to prevent surface oxidation during ocean transit.
• Shock Absorption: Polyurethane foam inserts custom-molded to the specific pump frame size to eliminate shock damage during rough handling.
• Port Protection: All hydraulic fluid ports, flange faces, and shaft extensions fitted with high-density plastic caps and protective covers.
• Bulk Palletization: Palletized shipments strapped with steel banding, edge-protected, and stretch-wrapped on ISPM-15 compliant treated wooden pallets.

Applications

Metal Stamping & Fine Blanking Presses: Executes precise pressure holding during deep drawing operations and delivers fast displacement de-stroking during press ram decompression to eliminate hydraulic shock.

Injection Molding Machinery: Provides accurate load-sensing flow control for mold clamping, injection speed profiling, and high-pressure pack/hold sequences while minimizing power consumption.

Heavy Steel Rolling & Forming Equipment: Manages position control for hydraulic roll-gap actuators under severe cyclic loading, relying on hard-on-hard wear surfaces to resist fluid contamination.

Oilfield Workover Rig Power Units: Drives rotary tables and top-drive mechanisms, maintaining steady torque control even when using fire-resistant or low-viscosity hydraulic fluids.

Related Models

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FAQ

Q1: How do I verify the exact model code configuration for replacement?

A: Check the metal nameplate located on the pump housing for the complete ordering code (e.g., PVM-046-A1UB-LS-P-1NN/J). Match the shaft type, porting layout, displacement code, and control option prefix against the official Oilgear PVM catalog ordering matrix.

Q2: What fluid cleanliness level is required for optimal PVM pump life?

A: System oil cleanliness should meet or exceed ISO 4406 code 18/16/13 (NAS 1638 Class 7). Installing a 10-micron nominal return line filter and a 3-micron absolute pressure filter is recommended to protect precision control spool interfaces.

Q3: Which hydraulic oil types are compatible with the PVM Series?

A: PVM pumps accept standard mineral-based hydraulic oils (HLP/HM), synthetic esters (HEES), polyol esters, and high-water content fluids (HWCF like water-glycol). Always select seal material (FKM/Viton) appropriate for synthetic or water-based media.

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