Vacuum pumping system

A vessel is evacuated and a vacuum maintained by a first, radial, pump and throttle valve and a second, rotary piston, pump in a pipe parallel, and connected, to that for the first pump. Control valves enable the first pump to extract at higher pressure and the second at lower pressure. The vessel (...

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Bibliographische Detailangaben
1. Verfasser:	AMLINGER, HEINRICH
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING HEATING LIGHTING MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT PUMPS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS WEAPONS
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Beschreibung
Zusammenfassung:	A vessel is evacuated and a vacuum maintained by a first, radial, pump and throttle valve and a second, rotary piston, pump in a pipe parallel, and connected, to that for the first pump. Control valves enable the first pump to extract at higher pressure and the second at lower pressure. The vessel (1), required to be evacuated, is connected to a radial pump (4) through a throttle valve (5) and a pipe (7). A rotary piston pump (13) is connected to the pipe (7) at a junction point (11). Control valves (14,15) determine whether the first pump alone or the second pump in series reduces the pressure in the vessel, according to the pressure value. The second pump alone can function through a back-pressure valve (19) in a pipe (18).