INDUSTRY COMPONENT

Diaphragm / Piston

Precision diaphragm or piston component for controlled fluid metering in industrial pumps.

Component Specifications

Definition
A critical component in precision metering pump assemblies, the diaphragm or piston functions as a flexible or rigid moving element that displaces fluid with high accuracy. It creates a sealed chamber that expands and contracts to draw in and expel precise volumes of liquid, ensuring repeatable dosing in applications requiring exact flow control. This component is engineered to maintain integrity under varying pressures and chemical exposures while minimizing pulsation and wear.
Working Principle
Operates through reciprocating motion driven by a mechanical or hydraulic actuator. In diaphragm designs, a flexible membrane flexes to change chamber volume, isolating the fluid from the drive mechanism. In piston designs, a solid plunger moves linearly within a cylinder, directly displacing fluid. Both types rely on precise stroke control and sealing to achieve accurate volumetric displacement per cycle.
Materials
Diaphragms: PTFE, FKM (Viton), EPDM, or reinforced elastomers; Pistons: Stainless steel (316L), ceramic, or hardened alloys with coatings like chromium or DLC; Seals: PTFE, PEEK, or elastomeric O-rings.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Accuracy±0.5% of setpoint
Diameter10-150 mm
Repeatability±0.1%
Stroke Length5-100 mm
Pressure RatingUp to 200 bar
Temperature Range-20°C to 150°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 28580, DIN 11866

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Material degradation from chemical exposure
  • Seal failure leading to leakage
  • Wear from abrasive fluids
  • Fatigue cracking in diaphragms
FMEA Triads
Trigger: Chemical incompatibility with fluid
Failure: Diaphragm swelling or cracking
Mitigation: Use PTFE or FKM materials and conduct compatibility testing
Trigger: Excessive pressure or pulsation
Failure: Piston or seal damage
Mitigation: Install pressure relief valves and dampeners, adhere to rated specs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Dimensional tolerance per ISO 2768-m, surface finish Ra ≤ 0.8 μm for pistons
Test Method
Hydrostatic pressure testing per ISO 5208, leak testing with helium or dye penetrant

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 Diaphragm / Piston

Manufacturer profiles associated with Diaphragm / Piston.

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Frequently Asked Questions

What is the difference between a diaphragm and piston in metering pumps?

Diaphragms use a flexible membrane to isolate fluid from the drive, ideal for corrosive or sterile applications, while pistons are rigid plungers for high-pressure or viscous fluids, offering direct displacement but requiring robust sealing.

How do I select the right material for a diaphragm or piston?

Choose based on fluid compatibility, pressure, temperature, and hygiene requirements. For example, PTFE for chemical resistance, stainless steel for durability, and elastomers for flexibility in sanitary applications.

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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