Pumps - Diaphragm pump
Diaphragm pumps are membrane pumps used for gentle transfer of liquids and gases in the laboratory. They separate the pumped medium from the drive mechanism via a flexible membrane.
Product
Pumps - Diaphragm pump
Diaphragm pumps are membrane pumps used for gentle transfer of liquids and gases in the laboratory. They separate the pumped medium from the drive mechanism via a flexible membrane.
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Blanc-Labo SA
Milian SA
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Guide and selection support
Diaphragm pumps are primarily used in laboratory processes where contaminated or aggressive media need to be pumped. Thanks to the membrane, they are especially resistant to contamination and sealing issues.
Key factors when selecting a diaphragm pump include the type of drive (pneumatic, hydraulic, mechanical, electrical), media compatibility, and flow rate. This pump technology enables precise control for dosing and transfer.
LabFinder offers a structured overview of membrane-principle pump types, supporting quick orientation regarding function, variants, areas of application, and targeted search for suitable pump technology.
Application and Benefits
Diaphragm pumps, also known as membrane pumps, are used for pumping liquids and gases in laboratory environments. They are particularly suitable for media containing solids or with aggressive properties. The flexible membrane mechanically separates the pumped medium from the drive, making the pump resistant to contamination and chemical stress. Typical applications include chemistry, pharmaceuticals, food technology, and biotechnology, where contamination-free and precise transfer is essential.
Selection Criteria
Crucial selection criteria for diaphragm pumps include the type of drive (pneumatic, hydraulic, mechanical, or electrical), the chemical resistance of the membrane to the medium, as well as flow rate and pressure range. Other relevant characteristics are pulsation, dosing accuracy, maintenance requirements, and operating life. The pumped medium must not damage the membrane or clog the pump.
Variants and Principles
The membrane is moved depending on the design by different drive principles: pneumatically with compressed air, hydraulically via a carrier fluid, mechanically via eccentrics, or electrically. These variants offer flexibility regarding discharge pressure, flow rate, and adaptation to changing applications. Besides simple diaphragm pumps, there are also multi-stage models for higher pressures.
Calibration and Maintenance
Diaphragm pumps require regular visual inspection of the membrane for wear and for tightness. The membrane itself is often a wear part and should be replaced as required by operating conditions. Calibration is usually done by checking the delivery volume under defined conditions to ensure dosing accuracy. Proper maintenance increases service life and operational safety.
Limitations of Use
Diaphragm pumps are not suitable for extremely high pressures exceeding design limits or for media that severely attack membrane materials chemically. Very viscous or abrasive media can damage the membrane. Additionally, compared to other pump types, flow rate is often limited, and there may be pulsation in the discharge flow, which must be considered for special applications.
Search Terms and Related Concepts
Common synonyms for this category include membrane pump, diaphragm pump, membrane hose pump, membrane air pump, or membrane transfer pump. Important keywords include laboratory pumps, liquid pump, gas transfer pump, pneumatic diaphragm pump, mechanical diaphragm pump, laboratory flow control, and chemically resistant pump.
Also known as
diaphragm pump
membrane-hose pump
membrane air pump
membrane dosing unit
membrane hand pump
membrane laboratory pump
membrane pump
membrane pumps
membrane transfer pump
membrane vacuum pump
Related categories
Frequently asked questions
How does a diaphragm pump work?
A diaphragm pump transfers liquids or gases by alternately moving a flexible membrane, which increases or decreases a pump chamber. The pumped medium is separated from the drive by the membrane, preventing damage from aggressive or contaminated substances.
What types of drives are available for diaphragm pumps?
Diaphragm pumps can be powered pneumatically via compressed air, hydraulically by a carrier fluid, mechanically via an eccentric shaft, or electrically. The choice depends on the intended use, pumping requirements, and available energy sources.
What should be considered when selecting a diaphragm pump?
Key aspects include the chemical resistance of the membrane to the medium, the required flow rate and maximum achievable pressure, type of drive, and ease of maintenance. Pulsation characteristics and dosing accuracy also play a role.
Which media can be pumped with a diaphragm pump?
Diaphragm pumps are suitable for liquids and gases, including those containing particulates or contaminants. They are often used with aggressive, viscous, or contaminated media, as long as the membrane material is compatible.
What are the limitations and restrictions of diaphragm pumps?
High pressures beyond design limits, very viscous or highly abrasive media can damage the membrane. The delivery rate and speed are often limited, and the flow may pulsate, which needs to be considered for applications requiring high precision.
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