EP 0723080 B1 19990922 - Vacuum pumping system
Title (en)
Vacuum pumping system
Title (de)
Vakuum-Pumpstand
Title (fr)
Système de pompage à vide
Publication
Application
Priority
DE 19500823 A 19950113
Abstract (en)
[origin: EP0723080A1] 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).
IPC 1-7
F04B 41/06; F04B 37/14; F04D 25/16; F04D 19/04; F04C 23/00; F04C 25/02
IPC 8 full level
F04B 23/08 (2006.01); F04B 37/14 (2006.01); F04B 41/06 (2006.01); F04C 23/00 (2006.01); F04C 25/02 (2006.01); F04D 17/10 (2006.01); F04D 19/04 (2006.01); F04D 25/16 (2006.01)
CPC (source: EP US)
F04B 37/14 (2013.01 - EP US); F04B 41/06 (2013.01 - EP US); F04C 23/005 (2013.01 - EP US); F04C 25/02 (2013.01 - EP US); F04D 19/046 (2013.01 - EP US); F04D 25/16 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 5595477 A 19970121; AT E184963 T1 19991015; DE 19500823 A1 19960718; DE 59506893 D1 19991028; EP 0723080 A1 19960724; EP 0723080 B1 19990922; ES 2136232 T3 19991116; JP H08232870 A 19960910
DOCDB simple family (application)
US 59005396 A 19960116; AT 95116395 T 19951018; DE 19500823 A 19950113; DE 59506893 T 19951018; EP 95116395 A 19951018; ES 95116395 T 19951018; JP 33862495 A 19951226