Diaphragm Membrane: Pressure Range 0-25 bar, Diameter 25-300 mm

Component Specifications

Definition

A diaphragm membrane is a flexible, elastomeric or metallic sealing component that separates two chambers within a diaphragm head assembly. It responds to pressure differentials to actuate valves, pumps, or regulators, enabling precise control of fluids or gases while preventing cross-contamination between media.

Working Principle

The diaphragm membrane flexes in response to pressure changes on one side, transmitting mechanical force to actuate connected components (like valve stems or pump mechanisms) while maintaining a hermetic seal between different fluid chambers.

Materials

Common materials include Nitrile Rubber (NBR), Ethylene Propylene Diene Monomer (EPDM), Fluorocarbon (FKM/Viton), Polytetrafluoroethylene (PTFE), or stainless steel for high-pressure/high-temperature applications. Material selection depends on chemical compatibility, temperature range (-40°C to 200°C), and pressure requirements (typically 0-25 bar).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	25-300 mm
Hardness	50-80 Shore A
Thickness	0.5-3 mm
Pressure Range	0-25 bar
Temperature Range	-40°C to 200°C
Elongation At Break	300-500%

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 3601-3, DIN 3750, ISO 21287

Parent Products

This component is used in the following industrial products

Diaphragm Head

The diaphragm head is the core component of a chemical dosing pump that houses the diaphragm and creates the pumping action through reciprocating motion.

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Engineering Analysis

Risks & Mitigation

Material degradation from chemical exposure
Fatigue failure from cyclic pressure
Installation damage during assembly
Incorrect material selection for application

FMEA Triads

Trigger: Chemical incompatibility with process fluid
Failure: Swelling, cracking, or loss of elasticity
Mitigation: Verify chemical resistance charts and conduct material compatibility testing

Trigger: Excessive pressure beyond rated capacity
Failure: Rupture or permanent deformation
Mitigation: Install pressure relief valves and monitor system pressure

Trigger: Improper installation or alignment
Failure: Pinching, tearing, or premature wear
Mitigation: Follow manufacturer installation guidelines and use proper tools

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm thickness, ±0.5 mm diameter

Test Method

Pressure cycling test per ISO 21287, leak test with helium mass spectrometry, material verification per ASTM D2000

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

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Manufacturers of Diaphragm Membrane

Manufacturer profiles associated with Diaphragm Membrane.

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Frequently Asked Questions

What is the primary function of a diaphragm membrane?

To separate different fluid chambers while transmitting pressure changes to actuate mechanical components, ensuring precise control without contamination.

How do I select the right diaphragm material?

Consider chemical compatibility with fluids, operating temperature/pressure ranges, and required flexibility. NBR for oils, EPDM for water/steam, FKM for aggressive chemicals.

What are common failure modes of diaphragm membranes?

Fatigue cracking from cyclic flexing, chemical degradation, extrusion under high pressure, and installation damage from improper handling.

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.

Diaphragm Membrane