Walk into almost any university laboratory, refrigeration workshop, or small electronics line, and you will find the same compact workhorse sitting under the bench: a two-stage, direct-drive pump in the 2 L/s class. The 2XZ-2 rotary vane vacuum pump has earned that position by being affordable to buy, simple to operate, and deep enough in vacuum for most low- and medium-vacuum jobs. This guide explains what the model code actually tells you, the specifications a genuine unit should deliver, where the pump is typically used, and how to separate a well-built machine from one that will wear out its vanes within a year.
What the Model Code "2XZ-2" Tells You
Chinese vacuum pump model codes are compressed descriptions of the machine itself. The leading "2" means two-stage: two pumping chambers work in series, so the pump reaches a far deeper ultimate vacuum than a comparable single-stage unit. "X" stands for xuanpian, the rotary vane vacuum pump working principle, in which an eccentric rotor with sliding vanes sweeps gas from the inlet to the exhaust. "Z" means zhilian, or direct-drive: the motor couples straight to the rotor, allowing high rotational speed, a small footprint, and lower vibration than older belt-driven designs. The final "2" is the nominal pumping speed, 2 liters per second, or roughly 7.2 m³/h.
Typical 2XZ-2 Specifications
Exact figures vary slightly from factory to factory, but any genuine 2XZ-2 should land close to these values:
| Parameter | Typical Value |
|---|---|
| Pumping speed | 2 L/s (7.2 m³/h) |
| Ultimate partial pressure | ≤ 6 × 10-2 Pa |
| Ultimate total pressure | ≤ 1.33 Pa |
| Motor power | 0.37 kW |
| Power supply | 220 V, single phase |
| Inlet port | 12 mm OD, KF adapter compatible |
| Oil charge | About 1 L |
| Noise level | Around 66 dB(A) |
| Dimensions | Roughly 514 × 168 × 282 mm |
| Weight | About 20-22 kg |
If a supplier quotes numbers dramatically better than these at a suspiciously low price, treat the claim with caution.
Where the 2XZ-2 Earns Its Keep
Because it balances size, vacuum depth, and cost, this pump class shows up across a wide range of work:
- Laboratories and universities: vacuum drying ovens, freeze dryers, rotary evaporators, and filtration manifolds. It is also the standard vacuum aspirator lab technicians use for solvent aspiration and sample preparation.
- Refrigeration and HVAC service: evacuating systems thoroughly before charging refrigerant, where residual moisture would otherwise damage compressors.
- Electronics and lamp manufacturing: exhausting tubes, vacuum welding, and coating preparation.
- Packaging and printing: small vacuum packaging machines, vacuum forming, and plate making.
- Backing duty: a fore-pump for diffusion pumps and turbo molecular pumps in compact high-vacuum rigs.
Five Checks Before You Place an Order
- Gas ballast valve. This lets the pump handle small amounts of condensable vapor, such as water or solvents, without emulsifying the vacuum pump oil. If your process involves any moisture, this feature is not optional.
- Anti-oil-backflow protection. When a pump stops under vacuum, oil can be sucked back into your chamber or instrument. A dual anti-backflow device prevents that contamination.
- Oil mist control. A quality exhaust filter keeps the work area free of oil smoke. Cheap pumps vent a visible mist that settles on every nearby surface.
- Wear-part quality. Vanes, bearings, and shaft seals decide how long the pump lasts. Ask the supplier which brand of bearings and oil seals goes into the machine.
- Spare parts support. Vanes, oil, and filters are consumables. A real factory keeps them in stock and ships them quickly; a trading company often cannot.
A quick field test tells you a lot: run the pump with the inlet blanked off for ten minutes, then check the exhaust for visible mist and listen for rattling vanes. A well-machined two-stage pump runs quietly and clean.
Why Buyers Source This Pump Class From InPowerVac
InPowerVac, the international brand of Zhejiang Yingpa Electromechanical Co., Ltd, has focused on vacuum equipment since 2000. Among established rotary vane vacuum pump manufacturers in China, the company operates two production bases with 92 sets of processing equipment, 30 of them imported, including 32 Mazak machining centers dedicated to precision pump components. Quality control runs through a material tensile lab, a vacuum testing room, a dynamic balance lab, and 3-coordinate measuring equipment.
The company's two-stage oil sealed rotary vane vacuum pump line is built with imported bearings and oil seals, British oil mist filter technology for a cleaner exhaust, and an anti-backflow oil design that protects the vacuum chamber at shutdown. Long replacement cycles for consumables keep lifetime running costs low, which matters far more to a busy lab or production line than a small saving on the purchase price.
That manufacturing depth is why InPowerVac pumps are used by Foxconn, Huawei, Samsung, the Tata Group, and other global manufacturers. In 2023 the company added a 70,000-square-meter plant in Taizhou, Zhejiang, expanding capacity for exactly this kind of high-volume, export-grade production. If you are comparing suppliers for a double stage rotary vane vacuum pump, ask InPowerVac for a datasheet and a quotation before you decide.
Get a quote today. Whether you need a single 2XZ-2-class pump for a laboratory bench or a full container for OEM integration, the InPowerVac team can provide technical datasheets, pricing, and customized configurations. Contact Winnie at Winnie@inpowervac.com or call +86 13858602188.
