EP 0709527 B1 20011004 - Backflow prevention device
Title (en)
Backflow prevention device
Title (de)
Rückflussverhinderungseinrichtung
Title (fr)
Dispositif de prévention de retour d'encoulement
Publication
Application
Priority
EP 94117162 A 19941031
Abstract (en)
[origin: EP0709527A1] The device has an intermediate chamber formed between two successive non-return valves, and has an unloader valve controlled by the pressure difference between it and the inlet side, so as to open the chamber to atmosphere before the difference falls to nil. The seats (20, 25) for the unloader valve and the non-return valve at the inlet side are concentric on the valve plug (17) and one inside the other in the radial direction. They can be formed by 45-deg. faces, while guide ribs (21) and stops (22) are situated between them. The plug can be connected to a spring seal (35), the unloader-valve plug (24) being loaded by this seal and a tension spring (28). The ribs can guide both plugs.
IPC 1-7
IPC 8 full level
E03C 1/10 (2006.01)
CPC (source: EP)
E03C 1/106 (2013.01); E03C 1/108 (2013.01)
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0709527 A1 19960501; EP 0709527 B1 20011004; DE 59409895 D1 20011108
DOCDB simple family (application)
EP 94117162 A 19941031; DE 59409895 T 19941031