EP 0295202 B1 19930107 - APPARATUS FOR INTRODUCING PRECISE QUANTITIES OF ADDITIVES INTO A PRESSURISED WATERSTREAM
Title (en)
APPARATUS FOR INTRODUCING PRECISE QUANTITIES OF ADDITIVES INTO A PRESSURISED WATERSTREAM
Publication
Application
Priority
CH 217787 A 19870610
Abstract (en)
[origin: EP0295202A2] The additive, for example extinguishing foam, is fed via an additive line (2) into the water line (1). A control valve (3) in the additive line (2), the actuator (4) of which receives actuating signals from a controller (8), serves to maintain the desired mixture ratio. To determine the actual value or to form the actuating signal, the additive is measured with an additive-measuring device (6) and the mixture is measured with a mixture-measuring device (7). In order to always obtain a constant pressure drop at the control valve (3) even during fluctuating water pressure in the water line, a pressure-difference valve (5) is fitted into the additive line (2). The drive device (18) for the feed pump (17) is provided with a speed regulator (19) whose rotational speed is controlled as a function of the position of the control valve (3). <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
B01F 25/31114 (2022.01)
Designated contracting state (EPC)
AT BE DE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0295202 A2 19881214; EP 0295202 A3 19891123; EP 0295202 B1 19930107; AT E84234 T1 19930115; CH 673091 A5 19900215; DE 3877264 D1 19930218
DOCDB simple family (application)
EP 88810291 A 19880504; AT 88810291 T 19880504; CH 217787 A 19870610; DE 3877264 T 19880504