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Lister Domestic Water pump - air chamber bleed screw (?)

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Lister Domestic Water pump - air chamber bleed screw (?)

Post by Porteous on Sun Oct 20 2013, 22:15

I have just acquired a DEP 1 pump with a broken air screw assembly on the top of the air chamber. What does this do? If it is just a bleed screw then can I fit a cheaper 1/8 BSP radiator bleed valve instead?

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Re: Lister Domestic Water pump - air chamber bleed screw (?)

Post by Villiers on Sun Oct 20 2013, 22:18

You can, the idea of the bleed screw is just that, the air chamber works as a "damper" to take the knock or "water hammer" out of the joining pipework caused by the piston, by adding or removing air as needed this works as a "cushion". If the pump is only for rallying then I would just put a 1/8 plug in it and leave it at that as you would not have enough "back pressure" to cause the pipes to "knock".

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Re: Lister Domestic Water pump - air chamber bleed screw (?)

Post by Porteous on Mon Oct 21 2013, 10:23

Many thanks, that solves a pocket problem!

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Re: Lister Domestic Water pump - air chamber bleed screw (?)

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