| 主权项 |
1. A compressed air foam system, comprising:
a. a liquid source; b. a compressed gas source; c. a mixing chamber connected to the liquid source and the compressed gas source and configured to produce a foam; d. a liquid valve positioned in a flow path between the liquid source and the mixing chamber and comprising a liquid valve position lying within a range inclusively between a fully closed position and a fully open position; e. a foam quality indicator; f. a string potentiometer comprising a cable in communication with the liquid control valve and the foam quality indicator, wherein the string potentiometer is configured to output to the foam quality indicator a selected liquid flow signal dependent on the liquid valve position; g. a liquid valve ring connected to the liquid valve; h. a winder connected to the liquid valve ring and to a distal end of the cable of the string potentiometer, whereby changing the position of the liquid valve causes the cable of the string potentiometer to extend or retract, further wherein the winder comprises a plurality of attachment points, and wherein the distal end of the cable of the string potentiometer is connected to the winder at one of the plurality of attachment points; and i. a handle linked to the liquid valve. |
