beer engine sucking back out of glass

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Hi we have a 1/4 pt beer engine that is sucking the beer back into the cylinder when the handle is returned, the beer engine is gas assist and has a check valve fitted, gas assist pump seems to be working ok.
Any ideas, could the check valve be faulty?

5 COMMENTS

  1. Hop filter blocked? Cask maybe hard pegged? More likely back check valve. Check the pipe behind the beer engine is not kinked.

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