Chemical-Resistant Diaphragm Vacuum Pump

What is the Chemical-Resistant Diaphragm Vacuum Pump?

A chemical-resistant diaphragm vacuum pump has a fully PTFE wetted path and reaches about 2 to 8 mbar, handling corrosive solvent and acid vapors without oil. It is used for solvent concentration, drying and aggressive filtration.

Overview

This pump combines multi-stage diaphragm heads with a fully fluoropolymer wetted path. Flow rates run from 20 to 120 L/min and ultimate vacuum reaches about 2 to 8 mbar, allowing solvent concentration and drying without an oil-sealed pump. Four heads connected in series provide the deeper vacuum, and the PTFE valves, head and diaphragms resist acids, bases and chlorinated solvents. A gas ballast or purge port helps carry condensable vapor out of the pump, and the exhaust can be routed to a hood or scrubber. Because operation is dry, there is no oil mist and no risk of oil backstreaming into samples, which matters for trace analysis and pharmaceutical work. Diaphragms remain consumable, and service is straightforward because the pump head can be opened without special tools.

How does it work?

A diaphragm pump uses a flexible membrane that reciprocates inside a small chamber. On the suction stroke the membrane moves back, the inlet check valve opens and fluid fills the chamber. On the discharge stroke the membrane pushes forward, the outlet valve opens and fluid is expelled while the inlet closes. An eccentric cam or a solenoid drives the membrane, and the valves control direction. Because the fluid never contacts the drive, these pumps are oil-free and tolerate corrosive gases and liquids when the wetted parts are made from PTFE, EPDM or stainless steel. Multiple heads can be connected in series to increase pressure or in parallel to increase flow. In liquid service they are self-priming, can run dry and handle small solids. Typical parameters are flow rate, pressure or vacuum, wetted materials and number of heads.

What are the key features?

• Fully PTFE and fluoropolymer wetted path
• Ultimate vacuum of about 2–8 mbar without oil
• Flow rates of 20–120 L/min
• Gas ballast or purge port for condensables
• Exhaust routable to hood or scrubber
• Tool-free pump head access for service

What are the technical specifications?

A typical chemical-resistant diaphragm vacuum pump configuration offers ultimate vacuum of 2–8 mbar, free-air flow rate of 20–120 L/min, number of heads of 2 or 4, wetted material of PTFE and fluoropolymer, gas ballast of Yes and motor power of 180–550 W. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Chemical-Resistant Diaphragm Vacuum Pump is used in solvent concentration, vacuum drying of solvent samples, aggressive filtration, centrifugal concentrator supply and degassing corrosive liquids. Across the wider Diaphragm Pumps class, laboratories also deploy it for vacuum filtration and aspiration, gas sampling and transfer and reagent and buffer transfer.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61326-1, ISO 21360, ISO 9001 and GB 4793.1. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the pump so that the inlet line is short and wide, and keep the pump below the liquid level where possible to help priming. Fit a filter on the inlet to protect the valves from particles, and a trap when pumping condensable vapors. Replace diaphragms and check valves as consumables, because cracks or worn seats cause flow loss and premature failure. Clean wetted parts with compatible solvents and avoid abrasive cleaning. For hazardous gases, exhaust to a safe location. Follow IEC 61010-1 for electrical safety, and verify flow or vacuum against a reference when the pump is used in regulated methods. Record part numbers, service intervals and calibration data so that maintenance and results stay traceable.

How do I select the right Chemical-Resistant Diaphragm Vacuum Pump?

Select this pump when aggressive vapors must reach a fairly deep vacuum without oil. For moderate vacuum and simple filtration, an oil-free standard diaphragm pump is sufficient. In the RFQ, state solvents, required vacuum and flow, and exhaust handling needs.

How does it compare with other Diaphragm Pumps variants?

Decide first whether you need vacuum, gas transfer or liquid transfer, since the head design differs. For vacuum and aspiration, choose a diaphragm pump with adequate free-air flow and the ultimate pressure your process needs. For liquid transfer, check the maximum discharge pressure, suction lift and ability to run dry. Match wetted materials to the fluid: PTFE and EPDM suit most solvents and acids, while stainless steel or PTFE-lined heads handle aggressive media. Choose the number of heads for the required flow and pressure, and consider double-diaphragm designs for higher pressure and smoother flow. Confirm the control interface, noise level and duty cycle for continuous instrument use. Specify calibration or flow verification where the pump is part of a metering system.