EP 0452426 B1 19921202 - BACKFLOW PREVENTER, ESPECIALLY FOR FITTING IN DRINKING WATER PIPES
Title (en)
BACKFLOW PREVENTER, ESPECIALLY FOR FITTING IN DRINKING WATER PIPES
Publication
Application
Priority
DE 3936962 A 19891107
Abstract (en)
[origin: WO9106716A1] Backflow preventers especially suitable for fitting in drinking water pipes have a through-flow housing (1) containing an inlet and an outlet pipe (2 and 3) with a spring-loaded inlet valve (4) inside it and a spring-loaded outlet valve (8) and a central chamber (13) arranged between the two valves (4, 8). When the differential pressure between said central chamber and the inlet pipe (2) dropes below a set minimum, said chamber can be caused to communicate with the outside atmosphere via a discharge valve which then opens, the body (28) of which is connected for this purpose to control components (18, 18') actuatable on one side by the inlet pipe pressure and on the other by the pressure in the central chamber, and can be raised from its outlet valve seat (30), freeing both a water outlet aperture and a ventilating aperture leading to the central chamber (13). In order to obtain an even simpler design for this outlet valve and improved water drainage and ventilation facilities for the central chamber (13), the water outlet aperture of the outlet valve and the ventilation aperture are combined into a single connecting aperture (14, 32) with a relatively large cross-section between the central chamber (13) and the outer atmosphere which can be steplessly opened more widely by the valve body (28) depending on the extent to which it is open.
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)
AT BE CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 9106716 A1 19910516; DE 3936962 A1 19910508; DE 59000553 D1 19930114; EP 0452426 A1 19911023; EP 0452426 B1 19921202
DOCDB simple family (application)
DE 9000547 W 19900720; DE 3936962 A 19891107; DE 59000553 T 19900720; EP 90910582 A 19900720