Diaphragm (for diaphragm pumps): Diameter 25-500 mm

Component Specifications

Definition

A diaphragm is a flexible membrane component in diaphragm pumps that separates the fluid chamber from the drive mechanism. It undergoes reciprocating deformation through mechanical, hydraulic, or pneumatic actuation to create positive displacement pumping action, moving fluids without direct contact between the fluid and mechanical parts.

Working Principle

The diaphragm flexes back and forth through actuation (mechanical linkage, hydraulic pressure, or air pressure), creating alternating pressure differentials. On the suction stroke, it expands the fluid chamber volume, drawing fluid in through the inlet valve. On the discharge stroke, it compresses the chamber, forcing fluid out through the outlet valve.

Materials

Typically made from elastomers (EPDM, NBR, Viton/FKM, Silicone, PTFE-coated) or thermoplastics (Polyurethane, Hytrel) selected for chemical compatibility, temperature resistance, flexibility, and durability. Reinforcement may include fabric or metal inserts.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	25-500 mm
Thickness	0.5-10 mm
Cycle Life	10^6 to 10^8 cycles
Stroke Length	5-100 mm
Temperature Range	-40°C to +200°C
Operating Pressure	Up to 200 bar

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 2858, ISO 5199, DIN 24256, ASME B73.3

Parent Products

This component is used in the following industrial products

Diaphragm or Peristaltic Pump

A pump component used in abrasive slurry delivery systems to precisely meter and transfer abrasive-laden fluids.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic stress
Chemical degradation from incompatible fluids
Installation errors causing leaks
Overpressure leading to rupture

FMEA Triads

Trigger: Material fatigue from high cycle operation
Failure: Crack or tear in diaphragm
Mitigation: Regular inspection, proper material selection, pressure relief valves

Trigger: Chemical incompatibility with pumped fluid
Failure: Swelling, hardening, or degradation
Mitigation: Verify chemical resistance charts, use PTFE lining if needed

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5 mm on critical dimensions, surface finish Ra ≤ 3.2 μm

Test Method

Pressure cycling test per ISO 2858, leak test with helium or dye penetrant, material certification to ASTM standards

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 (for diaphragm pumps)

Manufacturer profiles associated with Diaphragm (for diaphragm pumps).

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Frequently Asked Questions

How often should a diaphragm be replaced in a diaphragm pump?

Replacement frequency depends on operating conditions, material compatibility, and cycle count. Typically, diaphragms last 3-24 months with regular inspection recommended every 500-2000 hours.

What materials are best for chemical resistance in diaphragms?

PTFE (Teflon) offers excellent chemical resistance; Viton/FKM handles oils and fuels; EPDM suits water and mild chemicals; NBR works with oils and hydrocarbons.

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 (for diaphragm pumps)