Solenoid valve

Check out restaurant and bar supply places to see what they use in the soda guns.

Bob

Back some gezillion years ago, I worked on a booze dispenser... metered so that the barkeep couldn't cheat the house.

Bottles were up-ended into receptacles with tubing feeding to the dispenser at the bar.

A vent tube up into the end of the bottle provided air return.

Booze was dispensed using a "roller-pump"... tygon tubing with rollers so dispense was positive displacement... much like heart-lung machines work.

...Jim Thompson

Back (way back... like ~1984) when the wife and I used to run the snack shop at the high school football games, soda pop came to us separated... cans of "syrup" and CO2 cannisters... blended at the serving head. MESSY disassembly after each game and soak in hot water to clean up.

...Jim Thompson

Hello,

As Jim said roller pumps are possibly an option. But they aren't cheap. You can buy the roller assembly separately and supply your own motor which is how we did it.

There are valves that avoid contact with the medium to be controlled, something that can be an issue with food items. They have a wedge with a dulled edge that squishes onto a plastic hose to shut off the flow.

Ok, here goes. This is one of the suppliers we have used in the past but I am only familiar with their air pressure operated versions:

Besides the food contact issue I believe that a valve that directly operates on the sugary soda stuff might clog up pretty quickly.

Regards, Joerg

A peristaltic pump can handle most anything.

Jim Thompson skrev:

just go buy a sodastream

every bar around here uses a system so the drinks are alway the same size and counted by a computer. but no pumps and the bottles can stand normally on a shelf.

It fits on each bottle instead instead of the screwcap or cork, just sticks out about 5cm. To pour a drink a device connected to a computer fits over the part of the device that sticks out of the bottle and when you turn it upside down, out comes exactly 2cl. guess it is just a solenoid with the coil part in the device that is connected to the computer. it can even recognize different bottles so different bottles can have different prices and it is all stored in the computer.

-Lasse

Pondering less complex solutions... how about simply compressed air, since the bottle is inverted? Or CO2 ?:-)

...Jim Thompson

And you can make one of thos without a whole lot of trouble. Just get a geared motor, and have a sprocketed wheel, and you might need an outer ring to compress a plastic hose wrapped around the sproket.

greg