INDUSTRY COMPONENT

Piston/diaphragm

Piston/diaphragm converts fluid pressure into mechanical motion in solenoid/pneumatic actuators.

Component Specifications

Definition
A critical sealing and force transmission component in solenoid and pneumatic actuators that separates fluid chambers while converting hydraulic or pneumatic pressure into linear mechanical motion. The piston version uses sliding seals against cylinder walls, while the diaphragm version uses flexible membranes that deflect under pressure.
Working Principle
Operates on Pascal's law where pressurized fluid (air or hydraulic oil) exerts force on the piston face or diaphragm surface, creating linear displacement. In solenoid actuators, electromagnetic force initiates motion that the piston/diaphragm amplifies through fluid pressure conversion.
Materials
Pistons: Aluminum alloy, stainless steel, or engineered plastics with PTFE or polyurethane seals. Diaphragms: Nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), fluorocarbon (FKM), or thermoplastic polyurethane (TPU) with fabric reinforcement.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Diameter10-200 mm
Seal TypeO-ring, lip seal, or rolling diaphragm
Stroke Length5-500 mm
Pressure Rating0.1-20 MPa
Operating Temperature-40°C to 120°C

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 6431, ISO 15552, DIN ISO 21287, DIN 24554

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Seal degradation from fluid incompatibility
  • Fatigue failure from cyclic loading
  • Contamination causing scoring/sticking
  • Temperature extremes affecting material properties
FMEA Triads
Trigger: Fluid contamination
Failure: Seal wear and leakage
Mitigation: Install filtration and regular fluid analysis
Trigger: Excessive side loading
Failure: Piston rod bending or binding
Mitigation: Use proper alignment guides and rod supports
Trigger: Material incompatibility
Failure: Diaphragm swelling or cracking
Mitigation: Verify fluid-material compatibility charts

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.05 mm for piston diameter, ±0.1 mm for rod diameter per ISO 6431
Test Method
Pressure decay testing, cycle life testing, seal leakage measurement per ISO 19973

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 Piston/diaphragm

Manufacturer profiles associated with Piston/diaphragm.

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Related Components

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Main Frame
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Shaft Bearing
Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Frequently Asked Questions

What is the difference between piston and diaphragm actuators?

Piston actuators use sliding seals in cylinders for high-force applications, while diaphragm actuators use flexible membranes for cleaner operation with lower friction but limited stroke.

How do I select between piston and diaphragm designs?

Choose piston for high force/long stroke applications with potential contamination; choose diaphragm for clean environments requiring minimal friction and maintenance.

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.

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