In an earlier contribution to this discussion,
Mike Dodd wrote:

(First a story, mainly ranting and letting off steam, then there's a
question at the end)

Just bought a pair of Pump Ball Valves (screwfix id 13885) and a
Pegler Terrier Circulating Pump - TC5 (screwfix id 67174) to replace
an ageing and
noisy central heating pump. Didn't intend to use the Ball Valves -
rather hoping to re-use the originals, and isolate the pump with
those for a 10 minute replacement job, bought them simply to bugger
up Murphy's law and use
as back-up, well, they were cheap.

SNIP

The question is... for someone with experience of plumbing and central
heating... Just what is the trick of the trade to mating the Ball
Valves to
the pump bodies?, I imagine with play in the pipework it would be
fairly straight-forward, but for existing installations, with no
such play, how do
the Pro's handle this?

The valves which you bought do look exceptionally tight in terms of
interference between the big nut and the ball spindle. The equivalent Peglar
valves - albeit at 8 quid a pair - do appear to have much more room to
manoeuvre - as do the gate valves shown.

In order to be able to swap a pump easily, you need to be able to undo the
nuts in parallel fashion until they are clear of the joining flange. If you
can't, the valves are not fit for purpose!
--
Cheers,
Set Square
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