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Thread: Keg Washer design

  1. #16
    Join Date
    Oct 2014
    Location
    Kent, WA
    Posts
    338
    Quote Originally Posted by aeviaanah View Post
    Thanks for sharing your design. May I ask why pneumatic angle seat valves instead of electric solenoids?
    Steve
    Most solenoid valves are not direct acting. That is, the solenoid coil open a tiny pilot valve, allowing the process liquid to push against a diaphragm that opens the valve. Since the process liquid is what actuates the valve, they are very prone to clogging, which causes them to fail. The pneumatic angle seat valves are direct acting, in that air pressure pushes against diaphragm or piston and opens the valve.

    Regards,
    Mike

  2. #17
    Join Date
    May 2014
    Location
    Benicia, CA.
    Posts
    24
    Quote Originally Posted by rdcpro View Post
    Most solenoid valves are not direct acting. That is, the solenoid coil open a tiny pilot valve, allowing the process liquid to push against a diaphragm that opens the valve. Since the process liquid is what actuates the valve, they are very prone to clogging, which causes them to fail. The pneumatic angle seat valves are direct acting, in that air pressure pushes against diaphragm or piston and opens the valve.

    Regards,
    Mike
    From all of my research in this area of the keg cleaners. The pneumatic is most reliable and the one that allows, most open internal passage way for flow to pass at the max rate. most efficient and less restrictive. I am using manual ball valves at the moment but dream of building this. Great Job everyone!

  3. #18
    Join Date
    May 2012
    Posts
    42
    where is the best place to source the parts? pneumatic valves?

  4. #19
    Join Date
    Dec 2017
    Location
    Minneapolis, MN, USA
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    31
    Quote Originally Posted by jawsfree View Post
    where is the best place to source the parts? pneumatic valves?
    I used Alibaba and AliExpress.
    Alibaba is good for package purchases. All the valves or all TC plumbing can be bought and shipped dirt cheap to USA.

  5. #20
    Join Date
    May 2012
    Posts
    42
    Single Return or Double Acting? Looks like this one may work.

    https://www.alibaba.com/product-deta...7db13610AdgsIi

  6. #21
    Join Date
    May 2012
    Posts
    42
    Quote Originally Posted by NHBrewer23 View Post
    8. Use a pressure transducer for pressurizing the kegs with CO2 at the end of the cleaning cycle. CO2 supply varies with every install. Don't rely on time.
    Would you use a 15psi pressure transducer?

    Jason

  7. #22
    Join Date
    Dec 2017
    Location
    Minneapolis, MN, USA
    Posts
    31
    Quote Originally Posted by jawsfree View Post
    Single Return or Double Acting? Looks like this one may work.

    https://www.alibaba.com/product-deta...7db13610AdgsIi
    I used single normally closed valves. That way you can get away with a 3 way solenoid vs a 5 way for actuation of the valve. In no way am I a professional in this area, that's just what I ended up using.

  8. #23
    Join Date
    Dec 2017
    Location
    Minneapolis, MN, USA
    Posts
    31
    Quote Originally Posted by jawsfree View Post
    Would you use a 15psi pressure transducer?

    Jason
    This was the one I bought, 3 bar = ~44 PSI.

    https://www.aliexpress.com/item/3266...da524c4djrgUwj

  9. #24
    Join Date
    Jan 2018
    Location
    Jupiter, FL, USA
    Posts
    3

    Keg Empty Indication

    I'm curious how you were dealing with an inital keg drain cycle in your logic. Typically you would assume that all the kegs are empty but that may not be the case. The easy approach I suppose is to start with a full keg and see what the maximum time it takes to purge the keg as your timing for that step. I would think that's a simple drain valve open then air valve open and wait until time is over. I thought about looking at a differential pressure reading where lower air pressure = empty keg and higher = still have fluids in keg. Any thoughts about this one? I think all the remaining steps are easy after your first run through when you can time an actual process run at each step to come up with a good delay time for it to be empty. Since I'm also building brewery and fermenter controllers I decided to use the same PLC on all of them and was going with the Click PLC . that means I have to learn ladder logic but I only need to learn that once and use it everywhere. Rather than have the PLC do the PID functions I bought PID's for each temperature control and using the MODBUS 485 connectivity to change setpoints and read the data from the PID. Seemed like a more robust and dependable method and I can keep one PID on the shelf to replace anything that fails.

  10. #25
    Join Date
    Sep 2015
    Location
    Europe
    Posts
    28
    Keg purging is the key imo, as if pump is up to the task it will fill it faster than drain is able to empty it.
    While building semi automatic washer I use CIP to clean kegs with compressed air for purging. I noticed that co2 needs to be at least same diameter as beer port, or it may be be solved with hoses diameter...?

    What hose type and diameter you folks use?
    Specific or regular hose clamps?

    Sent from my GM 5 d using Tapatalk

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