In article ,
Andy Hall writes:

I've used lever ball valves and found them fine over a 3 year period
so far.

Certainly they are better than gate valves.

Yes. I've had no problem with the pump, but have had to drain
the system down twice to fix the gate valves, which are only
there in the first place so you don't have to drain the system
down. Seems to be a logic fault there somewhere?

--
Andrew Gabriel