What type of oil is used in a rotary vane vacuum pump?

[DiFelix]

Rotary vane vacuum pumps use vacuum pump oil. Below is relevant information about rotary vane vacuum pumps: 1. Introduction to rotary vane vacuum pumps: A rotary vane vacuum pump has an eccentrically installed rotor that contacts the fixed surface of the stator. Two vanes slide within the rotor slots and contact the inner wall of the stator, dividing the pump chamber into several variable volumes—a type of rotary positive displacement vacuum pump. Typically, the gap between the vanes and the pump chamber is sealed with oil, making rotary vane vacuum pumps generally oil-sealed mechanical vacuum pumps. 2. Applications of rotary vane vacuum pumps: Their working pressure range is 101325–1.33×10-2 (Pa), classifying them as low-vacuum pumps. They can be used independently or as backing pumps for other high-vacuum or ultra-high-vacuum pumps. They are widely applied in production and research sectors such as metallurgy, machinery, military industry, electronics, chemical engineering, light industry, petroleum, and pharmaceuticals.

[OValentina]

As someone with years of experience in vacuum equipment maintenance, I've encountered many issues with rotary vane pump oil. The most commonly used oil for rotary vane vacuum pumps is specialized vacuum pump oil, not regular or automotive engine oil. This type of oil must have low vapor pressure to prevent evaporation in vacuum conditions, which could contaminate the system, and it also needs good lubricating properties to reduce pump wear. I recommend mineral-based vacuum pump oil for its low cost and reliability, but synthetic oil is better for high-temperature environments. Oil selection significantly impacts pump efficiency—using the wrong oil can easily cause pump seizure or leaks. It's advisable to check oil levels regularly and change the oil every 500 operating hours. For brands, Shell or Edwards are good choices—don't skimp on this expense, as pump repairs are far more costly. During routine maintenance, ensure cleanliness to prevent contaminants from mixing with the oil, thereby extending equipment lifespan.

[AryaRose]

I've been operating vacuum pumps in the lab for over a decade, and rotary vane pumps rely entirely on proper oil for stable operation. We always use vacuum-specific oils, such as synthetic RotoVac oil, where low vapor pressure is crucial for fast and clean vacuum extraction. Never use regular engine oil as it can contaminate samples or equipment. The oil viscosity must also be appropriate, typically ISO VG 100 is preferred. The oil change interval depends on usage intensity—for continuous operation, change every three months. During maintenance, first turn off the pump, drain the old oil, then add new oil, being careful not to overfill to prevent spills. Choosing the right vacuum oil also reduces noise and enhances equipment durability. I once tried cheap oil, which caused the pump to overheat and shut down, wasting time on rework—it's simply not worth it.

[SanMelanie]

I'm a DIY enthusiast and have modified a household vacuum pump. Rotary vane pumps must use vacuum pump-specific oil, as regular engine oil can cause pump failure. Vacuum oil needs to have low vapor pressure and high-temperature resistance. I use a mineral oil-based type, which is cheap and easy to find. During maintenance, change the oil regularly according to the pump model, usually with guidance from the manual. If the oil quality deteriorates, the pump will make noise, so replace it promptly to avoid damage. Simply put, using good oil ensures peace of mind.