Depending on the corresponding configuration of the pump head, the pump can also be configured as an internal gear pump, a vane pump or a propeller pump.

Examples of the invention include an auger pump and a mixing auger pump which have varying degrees of mixing action, as well as a homogenizing pump which provides some pumping action but is primarily a homogenizer.

A vacuum pump, such as for example, a Roots- or screw-type pump, features several pump elements (14) arranged in a suction chamber (12).

The choke/s (2) is/are in the form of a displacement motor/pump such as screw type (single or twin), radial wing type, gear pump, piston/cylinder pump or a lobe pump.

The invention also relates to a method for operating a screw pump (1).

The screw rotor pair forms a screw pump stage together with a pump stage housing (25, 26).

The pump device (39) has a first rotor drive mechanism (41) and a uniaxial eccentric screw pump (21).

A friction vacuum pump has at least one turbomolecular pump stage (2) joined at its pressure side to a screw pump stage (4).

The conductive layer may be applied via ink jetting, ultrasonic spraying, auger or jet pumping.

The outlet of the reservoir is opened and the progressive cavity pump is actuated.

The invention relates to a dry-compressing spindle pump as a dual-shaft positive displacement unit for transporting and compressing gases, comprising a pair of spindle rotors in a compression chamber.

The vacuum device has an ejector pump (60) connected to a discharge port (57) of a screw pump (A) that is a vacuum pump at the last stage among the vacuum pumps.

A progressing cavity pump receives the material and delivers it to an extruder assembly or die.

The housing of the pump device according to the invention is equipped with a screw pump (137) and a turbine (139), which is driven by the pressurized inflowing lubricant, in the inlet channel for driving the screw pump.

The Archimedes type screw pump may be used in conjunction with the flexible cannula.