Gears/Pistons/Vanes: Pressure Range 100-7000 psi

Component Specifications

Definition

Gears, pistons, and vanes are essential internal components of hydraulic pumps that work together to create fluid displacement. Gears mesh to trap and move fluid, pistons reciprocate within cylinders to generate pressure, and vanes slide in slots to create pumping chambers. These components determine pump efficiency, flow characteristics, and pressure capabilities.

Working Principle

Gears rotate to create fluid pockets that move from inlet to outlet. Pistons move back and forth in cylinders, drawing in fluid during suction strokes and pressurizing it during discharge strokes. Vanes extend from a rotor due to centrifugal force, creating sealed chambers that expand and contract to move fluid. All three mechanisms convert rotational mechanical input into hydraulic energy through positive displacement.

Materials

Case-hardened alloy steel (AISI 8620, 4140) for gears; hardened tool steel or ceramic-coated aluminum for pistons; carbon graphite composites or hardened steel for vanes. Surface treatments include nitriding, carburizing, or DLC coatings for wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Rate	0.5-500 GPM
Efficiency	85-95% volumetric efficiency
Pressure Range	100-7000 psi
Surface Finish	8-16 µin Ra
Temperature Range	-40°C to 120°C
Clearance Tolerance	0.0005-0.002 inches

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4401, ISO 3019-2, DIN 24342, SAE J517

Parent Products

This component is used in the following industrial products

Hydraulic Pump

A mechanical device that converts mechanical power into hydraulic energy by moving hydraulic fluid through the hydraulic system.

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Engineering Analysis

Risks & Mitigation

Catastrophic failure from metal fatigue
System contamination from component wear
Pressure loss from seal degradation
Cavitation damage from improper inlet conditions
Overheating from excessive clearance

FMEA Triads

Trigger: Fluid contamination with abrasive particles
Failure: Accelerated wear on gear teeth and vane surfaces
Mitigation: Install 10-micron filtration, regular fluid analysis, and scheduled filter replacement

Trigger: Improper assembly tolerances
Failure: Reduced volumetric efficiency and overheating
Mitigation: Follow manufacturer torque specifications, use precision measuring tools, and verify clearances during assembly

Trigger: Cavitation from restricted inlet flow
Failure: Pitting and erosion on piston faces and vane surfaces
Mitigation: Ensure proper inlet line sizing, maintain fluid temperature within specifications, and use flooded suction configurations

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.0002 inches for critical dimensions, ±0.5° for angular relationships, surface finish within 8-16 µin Ra

Test Method

ISO 4406 for contamination control, ASTM E384 for hardness testing, coordinate measuring machines for dimensional verification, pressure decay testing for seal integrity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Gears/Pistons/Vanes

Manufacturer profiles associated with Gears/Pistons/Vanes.

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Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What causes premature wear in hydraulic pump gears and vanes?

Contamination from particles in hydraulic fluid, improper fluid viscosity, cavitation from low inlet pressure, misalignment, and inadequate lubrication are primary causes. Regular fluid analysis and proper filtration prevent most wear issues.

Can gears from different pump manufacturers be interchanged?

Generally not recommended due to precise tolerances, tooth profiles, and material specifications. Even slight variations can cause efficiency loss, noise, or catastrophic failure. Always use OEM or certified compatible parts.

How often should hydraulic pump components be inspected?

Visual inspection every 500 operating hours, performance testing every 2000 hours, and complete teardown inspection every 8000-12000 hours or per manufacturer recommendations. More frequent inspections in high-pressure or contaminated environments.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Gears/Pistons/Vanes