proportionneur à pression équilibrée

OBS: proportionneur à pression équilibrée; injecteur à pression équilibrée : propositions confirmées par le Centre de secours de l'Association nationale des sapeurs pompiers volontaires, en France.

CONT: Balanced pressure proportioner: The use of a separate pump for transporting and pressurizing foam concentrate to be delivered in the correct proportions to a flowing water stream offers the greatest advantage for reliable and accurate operation of a foam concentrate proportioning system which must function at varying rates of volume or pressure during its use. ... The balanced pressure system ... relies on: (1) a hydraulically monitored pressure control valve in a bypass foam concentrate line from a pump, and (2) a correctly sized venturi-type proportioning controller in the water line for correct and automatic proportioning over wide ranges of flow.
CONT: Balanced-pressure proportioners and around-the-pump proportioners are both systems that are built into the apparatus fire pump. Apparatus equipped with a balanced-pressure proportioner have a foam concentration line connected to each discharge outlets. This line is supplied by a foam concentrate pump separate from the main fire pump. The foam concentrate pumps draws the concentrate from a fixed tank on the apparatus. This pump is designed to supply foam concentrate to a desired outlet at the same pressure at which the fire pump is supplyng water to that discharge.