INDUSTRY COMPONENT

Spool Body

Precision-machined cylindrical component that regulates fluid flow in hydraulic valves through axial movement.

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Component Specifications

Definition
The spool body is the core moving element within a precision hydraulic valve, typically a ground and polished cylindrical component with precisely machined lands and grooves. It slides axially within the valve bore to open, close, or meter fluid passages between ports, controlling direction, flow rate, and pressure of hydraulic fluid in systems requiring high accuracy and repeatability.
Working Principle
Operates through axial displacement within a matched bore, where its lands block or uncover port openings. Pressure differentials across the spool create hydraulic forces balanced by control pressures or springs, enabling precise modulation of fluid flow paths between inlet, outlet, and actuator ports.
Materials
Case-hardened alloy steel (e.g., AISI 8620, 4140) or stainless steel (17-4PH, 440C) with surface hardness 58-62 HRC, core toughness 28-32 HRC. Chrome plating (0.02-0.05mm) or nitriding for wear/corrosion resistance.
Technical Parameters
  • Straightness 0.001mm/100mm
  • Surface Finish Ra 0.1-0.2μm
  • Spool Clearance 0.005-0.015mm
  • Temperature Range -40°C to 120°C
  • Diameter Tolerance ±0.002mm
  • Operating Pressure Up to 350 bar
  • Land Width Tolerance ±0.01mm
Standards
ISO 4401, DIN 24342, ISO 10770-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spool Body.

hydraulic spool valve spool body precision spool hydraulic valve component spool machining flow control spool Spool Body Spool Body in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Precision Hydraulic Valve Spool

Precision-machined metal component that controls fluid flow in hydraulic valves

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Engineering Analysis

Risks & Mitigation
  • Contamination-induced erosion
  • Thermal galling
  • Cavitation damage
  • Fatigue cracking at stress concentrators
FMEA Triads
Trigger: Hard particle contamination in fluid
Failure: Abrasive wear on lands leading to increased leakage
Mitigation: Install 3μm absolute filtration, specify hardened/chrome-plated surfaces
Trigger: Misalignment during assembly
Failure: Uneven wear and binding
Mitigation: Use precision alignment fixtures, verify bore concentricity <0.005mm TIR

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101, size tolerances per ISO 286
Test Method
Leakage test per ISO 10770-1, pressure cycling per ISO 6403

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes spool body sticking in hydraulic valves?

Contamination (particles >5μm), thermal expansion mismatch, improper clearance, or varnish buildup from degraded fluid.

How is spool body wear measured?

Through dimensional inspection of lands/grooves, surface roughness testing, and leakage flow tests per ISO 10770-1.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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