EP 0280901 B1 19900207 - PLUNGER PUMP
Title (en)
PLUNGER PUMP
Publication
Application
Priority
DE 3706785 A 19870303
Abstract (en)
[origin: EP0280901A2] 1. Plunger pump comprising at least two plunger working chambers and also plungers or plunger parts associated with the latter which operate in phase and which displace during their in phase strokes the same or different quantities of the pump medium, and also a releasable suction valve which is associated with the working chamber of the plunger or plunger part which displaces the larger volume and which remains permanently in the open position in the released state so that when the suction valve is released the pump can generate a low displacement flow at high pressure by means of the other plunger or plunger part which displaces the smaller volume and, when the suction valve is working, can generate a large displacement flow at low pressure by means of the working of the two plungers or plunger parts with an unchanged power requirement of the pump, characterised in that the two plunger working chambers (9, 10) are connected together through a duct with a non-return valve which closes in the direction of the working chamber (9) of the one plunger or plunger part, in that the suction side of the pump is only connected with the working chamber of the one plunger (7) or plunger part via the releasable suction valve (14) and in that the pressure side of the pump is connected with the plunger working chamber (10) of the other plunger (8) or plunger part only via a pressure valve (16) associated therewith.
IPC 1-7
IPC 8 full level
F04B 5/00 (2006.01); F04B 1/02 (2006.01); F04B 5/02 (2006.01); F04B 23/06 (2006.01); F04B 49/24 (2006.01); F04B 53/10 (2006.01)
CPC (source: EP)
F04B 1/02 (2013.01); F04B 49/243 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0280901 A2 19880907; EP 0280901 A3 19881221; EP 0280901 B1 19900207; DE 3706785 A1 19880915; DE 3860037 D1 19900315; ES 2012506 B3 19900401; JP S63230967 A 19880927
DOCDB simple family (application)
EP 88101593 A 19880204; DE 3706785 A 19870303; DE 3860037 T 19880204; ES 88101593 T 19880204; JP 4768788 A 19880302