On 2006-08-21 00:09:36 +0100, said:

NikV wrote:
"Graham" wrote in message ...

What are the advantages and disadvantages of gate valves and full-bore
Ball valves for mains water, and isolating parts of a CH system.

gate valves 'let by' and sometimes drop their 'gate' from the thread -

given the list of cons mentioned, why r they used?


NT

Because they always were and plumbers are not renowned for progressive
thinking.