'Twister', dry running screw vacuum pumps use a proven twin screw compression system that is "contactless" and needs no lubrication in the process chamber.

	Suitable for numerous applications across many industries
	Depending on size, vacuum up to 0.05 mbar (abs) and capacities from 80 to 700 m³/hr

Technical Overview
Like rotary vane pumps and rotary lobe pumps, the TWISTER screw vacuum pumps use static compression systems as a design principle. In contrast to rotary lobe pumps, compression takes place by internal volume contraction. The TWISTER is suitable for numerous applications across many different industries.

The Screw Principle
A screw vacuum pump consists of two screws, left and right handed.

The screws turn in the compression housing (9) with precision clearances and no contact or friction. The screws are synchronised via a precision gear set.

The contra-rotating screws cause a low pressure area in the suction port. Gas which is sucked in is trapped by the rotating screws and transported to the discharge end.

At the discharge end the volume of gas is compressed until the discharge port (6) is opened by the rear surface of the screw (1) and the gas is expelled through the discharge connection (7). Cooling is by water cooling jacket (8).