"Bill J." wrote in message
oups.com...
I've used those hand soaps that have close to a 5:1 ratio of water to
soap in them and when you press down on the top, they produce a soap
foam. I'd like to make a nozzle that does this on a larger scale. I've
seen ones for pressure washers that aspirate the soap into the nozzle,
but I want one that works just like the hand soap one. I want to just
have to force the premixed diluted soap mixture into the nozzle and
have foam come out at a velocity proportional to the input pressure.

Does anyone know how something like that would be designed?

Thanks in advance for any info.


Years ago (maybe 20) I had a foam lance attachment for a high
pressure washer, the venturi was on the suction side of the pump
to get the soap into the mix before the lance. The lance had a section
about 150mm long partly filled (90%) with small nylon balls of varying
sizes. The tube probably trebled in diameter at the same time so dropped
the pressure and the mix came out of a fairly large nozzle.

This flocked up the detergent mix and it really hung onto the vehicles
we were cleaning.