Leybold DIVAC Diaphragm Pumps

Diaphragm pumps are the simplest way to get clean, oil-free rough vacuum. With no oil in the pump, there is nothing to change, nothing to backstream into your system and no oil mist at the exhaust. Leybold DIVAC pumps cover two jobs: chemistry-resistant pumps for laboratory work and multi-stage pumps built to back small turbomolecular pumps. At Provac Sales, we supply DIVAC pumps and replacement diaphragm and valve kits.

Leybold DIVAC Models We Carry

DIVAC L Laboratory and Chemistry Pumps

• DIVAC 0.6 L, about 0.6 m³/h (0.35 CFM), two-stage
• DIVAC 1.2 L, about 1.2 m³/h (0.7 CFM), two-stage
• DIVAC 2.2 L, about 2.0 m³/h (1.2 CFM), two-stage, in 100 V, 115 V and 230 V versions

The L series reaches about 8 mbar (6 Torr). Wetted parts are made of PTFE, FFPM and PVDF, so these pumps resist solvents and aggressive chemical vapors.

DIVAC T, HV3 and VT Turbo Backing Pumps

• DIVAC 0.8 T, about 0.77 m³/h, ultimate pressure about 3 mbar
• DIVAC 0.8 LT, about 0.77 m³/h, a low-pressure version reaching about 0.5 mbar
• DIVAC 1.4 HV3, three-stage, about 1.3 m³/h and 1.5 mbar
• DIVAC 1.4 HV3C, three-stage with chemical-resistant materials and speed control, about 2 mbar
• DIVAC 3.8 HV3, three-stage, about 3.4 m³/h at 50 Hz and 3.8 m³/h at 60 Hz, reaching about 1 mbar
• DIVAC 4.8 VT, about 4.8 m³/h, a low-vibration design for sensitive instruments

Some listings show a price and others are quote-based. Each product page lists pumping speed, ultimate pressure, voltage and connections.

L Series vs Turbo Backing Series

Choose by what the pump has to do:

• DIVAC L pumps are for chemistry. They handle solvent vapors in rotary evaporators, filtration, vacuum ovens, gel dryers and desiccators. Their ultimate pressure of about 8 mbar is plenty for these jobs.
• DIVAC T, HV3 and VT pumps are for backing turbo pumps. A turbo pump needs a low foreline pressure to run properly. The three-stage HV3 pumps reach 1 to 1.5 mbar, and the 0.8 LT reaches about 0.5 mbar, which suits compound and wide-range turbo pumps such as the Leybold TURBOVAC i series.

How a Diaphragm Pump Works

A motor drives a connecting rod that flexes an elastomer diaphragm up and down. As the diaphragm pulls down, the chamber above it expands and gas enters through the inlet valve. As it pushes up, the gas is compressed and leaves through the outlet valve. Two or three heads in series each lower the pressure further, which is why three-stage HV3 pumps go deeper than two-stage L pumps. Because the diaphragm seals the chamber, no oil ever contacts the gas.

Key Features

• Completely oil-free, with no oil changes and no backstreaming
• Quiet, compact and light enough for benchtop use
• Chemical-resistant PTFE, FFPM and PVDF wetted parts on L and HV3C models
• Wide-range single-phase motors on HV3 models, from 90 V to 230 V
• Speed control on the DIVAC 1.4 HV3C
• Low-vibration DIVAC 4.8 VT for analytical instruments

Applications

• Backing small turbomolecular pumps, from the SL 80 up to the TURBOVAC 450i
• Mass spectrometers, leak detectors and other analytical instruments
• Rotary evaporators, vacuum filtration and solvent recovery
• Vacuum ovens, gel dryers and desiccators
• Chemical, biological and pharmaceutical laboratories
• Compact pumping stations such as the Leybold TURBOLAB Core

How to Choose the Right DIVAC Pump

Before ordering, confirm:

• Whether the pump is for chemistry or for backing a turbo pump
• The foreline pressure your turbo pump needs, if you are backing one
• Pumping speed needed for your chamber volume and pumpdown time
• Process vapors, especially solvents, acids and water
• Supply voltage and frequency
• Vibration limits on sensitive instruments

Maintenance Tips

• Replace diaphragms and valves at the interval in the manual, usually every 10,000 to 15,000 hours on clean service
• Run the pump for a few minutes with the inlet open to air after pumping condensable vapors, so moisture does not settle in the heads
• Use an inlet trap or cold trap when pumping heavy solvent loads
• Keep the cooling fan and air inlets clear

We stock diaphragm and valve kits for common DIVAC models.

Signs Your Diaphragm Pump Needs Service

• The pump no longer reaches its rated ultimate pressure
• Your turbo pump struggles to reach full speed or shows high foreline pressure
• Clicking, flapping or new noise from the heads
• Visible cracks or swelling on the diaphragm
• The motor runs hot or the pump stalls on start

New Pumps and Replacement Kits

A DIVAC pump is easy to bring back to full performance. Most wear happens in the diaphragms and valves, which can be replaced on site with a kit and basic tools in well under an hour. Replacing the kit restores the original ultimate pressure in most cases, so a pump that has drifted up to several mbar is usually worth servicing rather than replacing. Replace the whole pump when the motor, bearings or connecting rods are worn, or when the heads are cracked or badly corroded by chemicals.

Pairing DIVAC Pumps with Turbo Pumps

When a diaphragm pump backs a turbo pump, foreline pressure matters more than raw pumping speed. A DIVAC 1.4 HV3 or 3.8 HV3 keeps the foreline low enough for most compact turbo pumps at low gas loads. For higher gas loads, such as on a leak detector or a sputtering chamber, step up to a larger DIVAC or a SCROLLVAC scroll pump so the turbo is not overloaded.

Leybold Diaphragm Pumps Repair

Provac Sales services Leybold DIVAC diaphragm pumps, including diaphragm and valve replacement. Submit an RMA request and complete the contamination data sheet before shipping. See our pump repair page for more information.

Related Leybold Collections

• Leybold turbo pumps, TURBOVAC i and iX pumps that DIVAC pumps back
• Leybold scroll pumps, SCROLLVAC plus for higher dry pumping speed
• Leybold pumping stations, including the diaphragm-backed TURBOLAB Core
• All Leybold vacuum pumps
• All diaphragm pumps from every brand we carry

Leybold Diaphragm Pumps FAQ

1. What is the difference between DIVAC L and DIVAC HV3 pumps?

DIVAC L pumps are two-stage chemistry pumps with PTFE, FFPM and PVDF wetted parts that reach about 8 mbar. DIVAC HV3 pumps are three-stage pumps that reach about 1 to 1.5 mbar and are built to back turbomolecular pumps.

2. Which DIVAC pump should I use to back a turbo pump?

Use a DIVAC 1.4 HV3 or 3.8 HV3 for most small turbo pumps, or the DIVAC 0.8 LT when you need a lower foreline pressure of about 0.5 mbar. Leybold lists DIVAC backing pumps for turbo pumps from the SL 80 up to the TURBOVAC 450i.

3. Do Leybold DIVAC pumps need oil?

No. DIVAC pumps are dry diaphragm pumps. There is no oil to change, and no oil can backstream into your system or appear as mist at the exhaust.

4. Can a DIVAC pump handle solvents?

Yes. The DIVAC L series and the DIVAC 1.4 HV3C use chemical-resistant PTFE, FFPM and PVDF materials and suit solvent work such as rotary evaporation. Use a cold trap for heavy solvent loads.

5. How often do DIVAC diaphragms need replacing?

On clean service, diaphragms and valves usually last 10,000 to 15,000 hours. Condensing vapors, particles and high temperatures shorten that, so replace them when ultimate pressure rises.

Request a Quote on Leybold DIVAC Diaphragm Pumps

Send us your application, required ultimate pressure, the turbo pump you are backing if any, and your supply voltage. We will recommend the right DIVAC model, confirm availability or quote diaphragm and valve kits. Contact us or call 831-462-8900.