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Spool Body Component – Machinery and Equipment Manufacturing

Q: What causes spool body sticking in hydraulic valves?

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

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.

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

View Product Details

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

Buyer Feedback

★★★★☆ 4.7 / 5.0 (20 reviews)

"Great transparency on the Spool Body components. Essential for our Machinery and Equipment Manufacturing supply chain."

"The Spool Body we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."

"Found 36+ suppliers for Spool Body on CNFX, but this spec remains the most cost-effective."

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Frequently Asked Questions

What causes spool body sticking in hydraulic valves?