INDUSTRY COMPONENT

Piston / Plunger

A reciprocating cylindrical component that creates pressure and flow in pump heads and fluid blocks by moving within a sealed chamber.

Component Specifications

Definition
A precision-engineered cylindrical component that moves linearly within a pump head or fluid block chamber to displace fluid. It creates pressure differentials through reciprocating motion, converting mechanical energy into hydraulic energy. Critical for maintaining seal integrity and volumetric efficiency in positive displacement pumps.
Working Principle
Operates on positive displacement principle: as the piston/plunger retracts, it creates vacuum to draw fluid into the chamber; during forward stroke, it compresses and displaces fluid through outlet valves. The sealing interface between component and chamber wall prevents backflow and maintains pressure.
Materials
High-strength alloy steels (AISI 4140, 4340), stainless steels (316L, 17-4PH), ceramics (alumina, zirconia), or engineered polymers (PEEK, PTFE) with hardness 45-60 HRC. Surface treatments include chrome plating (0.05-0.1mm), nitriding, or DLC coating for wear resistance.
Technical Parameters
  • Hardness 50-58 HRC
  • Straightness 0.01mm/100mm
  • Surface Finish Ra 0.2-0.4μm
  • Pressure Rating Up to 1000 bar
  • Temperature Range -40°C to 200°C
  • Diameter Tolerance ±0.005mm
Standards
ISO 3320, ISO 3321, DIN 24334, DIN 3852

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Piston / Plunger.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Cavitation damage from improper NPSH
  • Seal failure from contamination
  • Fatigue cracking at stress concentrations
  • Corrosion in chemical applications
FMEA Triads
Trigger: Abrasive particles in fluid
Failure: Surface scoring and increased clearance
Mitigation: Install 10μm filtration, use hardened materials, implement condition monitoring
Trigger: Misalignment during assembly
Failure: Eccentric wear and premature seal failure
Mitigation: Use alignment fixtures, verify runout <0.02mm, follow torque sequences

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO 286-2:2010 h6/g6 fit for diameters 10-100mm
Test Method
Pressure testing per ISO 9905, dimensional verification per ISO 2768-mK, material certification per EN 10204 3.1

Buyer Feedback

★★★★☆ 4.6 / 5.0 (38 reviews)

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"Great transparency on the Piston / Plunger components. Essential for our Machinery and Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the difference between piston and plunger in pump applications?

Pistons typically use packing rings or seals on the cylinder wall, while plungers use seals on the plunger itself. Plungers generally handle higher pressures (500+ bar) with simpler sealing arrangements.

How often should pistons/plungers be replaced in industrial pumps?

Replacement intervals depend on operating conditions: typically 2,000-8,000 hours. Monitor for scoring, diameter wear exceeding 0.1mm, or pressure drop >15% as replacement indicators.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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