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Old 07-28-2019, 01:07 PM
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Grumage Grumage is offline
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Join Date: Jan 2013
Location: Great Britain
Posts: 73
Thanks for your two penneth.

Hi HuntingRoss.

I can get to stage 3 without a problem in your description.

At stage 4 we have a collapsed bellows that is flooded. With the transfer valve shut we can now refill with a fresh charge of water. This action causes the fluid above to be displaced through the annular gap and through the cup washer
( non return valve ) at the top.

Some of the displaced mass is now held above the displacer piston leaving a small amount below.

I wonder if by adding some dimensions we can get the figures needed to see if the design is plausible?

Cheers Graham.
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