PRESSURE CONTROLLER FOR CHEMICAL FIRE TRUCK AND CHEMICAL FIRE TRUCK

摘要

PURPOSE:To display complete fire extinction performance by always radiating a bubble extinction agent by introducing the entry pressure of a valve to a piston small in diameter, the exit pressure to a piston large in diameter, and the air between both pistons, opening/closing the valve by the balance of the pressure, and adjusting water pressure. CONSTITUTION:A controller 1 is equipped with the valve 2, and the piston 4 small in diameter and the piston 5 large in diameter are provided at the stem 3 of the valve 2. The pressure receiving part 4a of the piston is communicated to an entry 6 with a conduit 8, and the pressure receiving part 5a to an exit 7 with a conduit 9. A cavity 11 between the pistons 4, 5 is communicated to the air at a bleather 12. When the controller 1 is connected to the water source of a fire hydrant T, etc., the pressure at the entry 6 and the exit 7 go to the one almost equivalent to the water pressure of the water source, and the piston 5 large in diameter is moved in a direction to close the valve 2 by pressing the piston 4 small in diameter and a spring 15, and a terminal part 2a closes a side port 10a. When the pressure at the exit 7 is lowered by driving a discharge pump P1, the pressure applied to the piston 5 large in diameter is decreased, and the valve 2 is opened, and the valve 2 is stopped at a prescribed position, and the water absorption part of the discharge pump P1 can be always kept at low pressure, for example, around 0.3-1.5kg/cm, and a mixer M can mix foam liquid.