Compression Capability

Rotary Vane Compressor

Rotary Vane compressors manage ratios up to 7:1 in compression applications.

Ro-Flo’s have a MAWP of 200 psig (13.6 barg).

Ro-Flo’s are capable of operating at deep vacuum levels

Screw Compressor

Flooded screws can manage pressure ratios up to 10:1 or greater.

Flooded Screws can reach discharge pressures up to 350 psig.

Flooded screw compressors typically cannot operate in vacuum


Rotary Vane Compressor

Rotary vanes require a small amount of oil which is continuously injected for lubrication purposes only.

Typically a rust & oxidation inhibiting mineral oil is sufficient for compressor option. Special applications (high H2S, H2, etc.) may require synthetic oil.

Screw Compressor

Flooded screws require a large amount of recirculating oil which lubricates and removes the heat of compression.

Typically a synthetic oil is used to ensure good operating life. This will need to be recycled/replenished on a regular basis.


Rotary Vane Compressor

A significant portion of the power input into sliding vane compressors is imparted to the gas.

Sliding vane compressor power consumption is optimized during the manufacturing process by modifying the discharge port angle to best fit the application needs.

Screw Compressor

Flooded screws continuously pump oil through the compression chamber via an integral or external pump, which can increase power consumption

Flooded screw compressors use a variable Volume Ratio to optimize the pressure ratio


Rotary Vane Compressor

Ro-Flo sliding vane compressors are water jacketed to provide thermal stabilization of the cylinder and remove heat from the bearings.

Screw Compressor

A large amount of heat is absorbed by the lubricating oil. This oil needs to be cooled before being recirculated.

Gas Composition Tolerance

Rotary Vane Compressor

Rotary Vane compressors can tolerate almost any gas, as well as varying compositions

Rotary Vane compressors can manage very low or very high molecular weights

Screw Compressor

The recirculated oil of a flooded screw can become contaminated from the process gas and condensation from the heating and cooling cycles

Flooded screw compressors cannot tolerate high molecular weight gases

Capacity Control

Rotary Vane Compressor

Sliding vane capacity control is most commonly implemented via a variable speed drive (VSD) or gas recycle loop.

Screw Compressor

Flooded screw compressors may have capacity control implemented via a slide valve (typically implemented with a fixed speed motor). Flooded screw compressors may also be controlled via a variable speed drive.

Field Service

Rotary Vane Compressor

Hand tools are needed for basic maintenance. A complete repair can be completed by properly trained machine shops.

Screw Compressor

Requires maintenance at a qualified repair facility. Often compressors are just replaced due to cost.

Ready To Get Started?

At Ro-Flo Compressors, we are always ready to discuss your gas compression and product testing needs.