EP 0428374 A1 19910522 - Positive displacement pump systems.
Title (en)
Positive displacement pump systems.
Title (de)
Verdrängerpumpe-Anlagen.
Title (fr)
Systèmes de pompe à déplacement positif.
Publication
Application
Priority
GB 8925592 A 19891113
Abstract (en)
A positive displacement pump has two separate outlet passages, 16, 17 leading to a main outlet passage 18 containing a constant flow orifice 20. Outlet passage 17 contains a non-return valve 19. A control valve member is mounted in a bore opening to passage 18 upstream to orifice 20. The bore has an annular overspill port 31 and a by-pass port 34 which opens to outlet passage 17 upstream of valve 19. The valve member has two lands 29, 30 having end faces co-operating respectively with annular edges 31a, 34a of ports 31, 34. Notches 35, 36 are respectively formed in said end faces. On increasing pressure upstream of orifice 20 moves the valve member to by-pass the delivery from passage 17 to the overspill. Further increase of pressure then causes closure of the valve 19 and causes the valve member to move suddenly to pass fluid from passage 18 to the overspill port 31.
IPC 1-7
IPC 8 full level
F04B 1/06 (2006.01); F04B 49/24 (2006.01); F04C 2/344 (2006.01); F04C 14/26 (2006.01)
CPC (source: EP)
F04B 1/063 (2013.01); F04B 49/24 (2013.01); F04C 2/3447 (2013.01); F04C 14/26 (2013.01)
Citation (search report)
- [A] EP 0005190 A1 19791114 - REXROTH GMBH G L [DE]
- [A] US 2074618 A 19370323 - ROEDER CLYDE A
- [A] EP 0047885 A1 19820324 - KRAUSS MAFFEI AG [DE]
- [A] US 2192512 A 19400305 - TWISS FRANK E
- [A] FR 2136479 A5 19721222 - LUCAS INDUSTRIES LTD
- [A] GB 681625 A 19521029 - HOBSON LTD H M, et al
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0428374 A1 19910522; EP 0428374 B1 19940713; DE 69010631 D1 19940818; DE 69010631 T2 19941027; GB 8925592 D0 19900104
DOCDB simple family (application)
EP 90312361 A 19901113; DE 69010631 T 19901113; GB 8925592 A 19891113