This page explains how Piston / Diaphragm Assembly is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.
A precision component in pharmaceutical-grade sterile diaphragm valve actuators, combining a piston and a flexible diaphragm to create a sealed, sterile actuation mechanism.
Technical details and manufacturing context for Piston / Diaphragm Assembly
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Operating Temperature | -10–80 °C | Outside this range, diaphragm life is reduced |
| Piston Diameter | 50–200 mm | Matches actuator size |
| Stroke Length | 10–50 mm | Determines valve opening |
| Diaphragm Thickness | 2–5 mm | Affects flexibility and durability |
| Surface Roughness (Contact Area) | 0.4–0.8 μm Ra | Critical for sterile sealingISO 4287 |
| Leakage Rate | ≤0.1 mL/min | At 1.1× rated pressureISO 15848-1 |
| Cycle Life | 100000–500000 cycles | Depends on pressure and temperature |
| Weight | 1.5–8.0 kg | Varies with size |
| Material (Piston) | 316L | Corrosion-resistant stainless steelASTM A276 |
| Material (Diaphragm) | EPDM | FDA-compliant for pharmaceutical useASTM D2000 |
| Ingress Protection | IP65–IP67 | For washdown environmentsIEC 60529 |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
Commonly used trade names and technical identifiers for Piston / Diaphragm Assembly.
| pressure: | Up to 10 bar (150 psi) operating, 15 bar (220 psi) burst |
| flow rate: | Dependent on valve size (Cv 0.1 to 50) |
| temperature: | -10°C to +80°C |
| slurry concentration: | Up to 20% solids by weight, particle size <100μm |
Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.
Quoted from the published standard.
Manufacturer profiles associated with Piston / Diaphragm Assembly.
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A practical evidence checklist for RFQ preparation and supplier evaluation.
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The assembly converts pneumatic or hydraulic pressure into mechanical motion to operate the valve. The piston provides force, and the diaphragm acts as a sterile barrier, preventing contamination between the actuation fluid and the process fluid.
The piston is typically made of 316L stainless steel (per ASTM A276), and the diaphragm is made of FDA-compliant EPDM (per ASTM D2000). PTFE-coated components may also be used. These materials are selected for corrosion resistance and pharmaceutical compatibility.
Key parameters include operating pressure of 1.0–1.6 MPa, temperature range of -10 to 80 °C, piston diameter 50–200 mm, stroke length 10–50 mm, diaphragm thickness 2–5 mm, surface roughness 0.4–0.8 μm Ra (ISO 4287), leakage rate ≤0.1 mL/min at 1.1× rated pressure (ISO 15848-1), and cycle life 100,000–500,000 cycles. These are reference values; verify with the manufacturer.
You should confirm the model-specific values for pressure, temperature, dimensions, and materials with the legal manufacturer or supplier. Also verify compliance with relevant standards such as ISO 4287, ISO 15848-1, ASTM A276, ASTM D2000, and IEC 60529 for your specific process conditions.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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