Manifold in Fire Engine
https://youtu.be/83JuPJC-Is4 The foam pump discharges foam concentrate into the manifold of foam header.
Foam Liquid Injection Pump
https://youtu.be/17R6lM54Tdg The Edwards Model pump is a standard-duty high-speed gear driven positive-displacement rotary pump with gear-type rotors.
Foam check valve in Fire Engine
https://youtu.be/83JuPJC-Is4 If metering valves are not working properly or foam pump stops, the water pressure overcomes the foam pressure and water enters into the manifold. Consequently, a check valve is installed between foam manifold and each metering valve to prevent backflow of water into the foam system.
Pressure Relief Valve in Fire Engine
https://youtu.be/wLQg0KuT2Ec A pressure relief valve is supplied on the foam system and When system is set to the manual switch position, at pressure higher than 250 PSI the relief valve will open and foam flow is returned to the suction side of the pump to protect foam system components from over-pressure conditions. How does the…
Ratio Flow Controllers in Fire Engine
https://youtu.be/N2Nlhllwx08 Foam concentrate is pumped from the tank or remote source and discharged through manifold and then, metering valves to the individual ratio flow controllers. Each water discharge, that is dedicated for foam operation is equipped with a ratio flow controller that proportions foam concentrate into the water line. Ratio flow controllers are modified venturi…
Auxiliary Valve in Fire Engine
https://youtu.be/k5tjcsMTe00 There are two air actuated quarter turn full flow bronze ball valves (FOAM TANK-TO-PUMP and FOAM FILL) provided to facilitate operation of the auxiliary foam inlet and outlet.