Any reason 1/2" Portsmouth (Part 1 ballcocks or FOV) are still sold at all?

[Ric2013]

To cut a long story short, I started reading the the WRAS Water Regs book again:

G16.1 d states that a G1/2 size valve (do they mean a 1/2" valve as opposed to, say, a 3/4" valve?) must be 'constructed so that the water shut-off level may be altered [...] without bending the float lever.' So why bother making Part 1 valves of that size at all?

I suppose you could argue that replacing a valve does not constitute installing one so you can fit a non-compliant valve as a replacement? Is that why these are still sold?

Just wondering as usual 🙂

Thanks,

Ric

 

[JCSPLUMBING]

yep. They can be replaced but why on earth would anyone bother. Just use a part two.

 

[Ric2013]

They were out of date in 1962, so I have no idea either. Still finding loads of them in service though.

 

[JCSPLUMBING]

I changed one yesterday funnily enough.

 

[chris watkins]

Part 2's are only made in G1/2 & 3/4 sizes so if you want anything bigger it is still the Part 1.

Also Part 2 is limited to the orifice size that can be fitted I seem to remember.

 

[Ric2013]

That's my point: specifically, why bother making the half inch? What does the G stand for, by the way?

R

 

[chris watkins]

https://en.wikipedia.org/wiki/British_Standard_Pipe

BSP G & R

 

[Terry P]

Many existing WC cisterns still in use have a Portsmouth float operated valve (part1), when the valve is in need of replacement the use of a part2 will not fit due to its air gap back flow protection of the water outlet at the top by means of the bent plastic water delivery spout sticks up too high for the cistern lid. The part 1 can be installed providing back flow protection is installed in the supply pipe in line with The Water Supply (Water Fittings) Regulations 1999.

 

[cr0ft]

Many existing WC cisterns still in use have a Portsmouth float operated valve (part1), when the valve is in need of replacement the use of a part2 will not fit due to its air gap back flow protection of the water outlet at the top by means of the bent plastic water delivery spout sticks up too high for the cistern lid. The part 1 can be installed providing back flow protection is installed in the supply pipe in line with The Water Supply (Water Fittings) Regulations 1999.

Where I've seen this though I just replace them with a side entry adjustable arm float valve tbh.

 

[Harvest Fields]

Where I've seen this though I just replace them with a side entry adjustable arm float valve tbh.

As long as there is space to do it I have come across a couple where I couldn't

 

[moonlight]

Again if there is space, I would update to part 2 unfortunately at times someone has cut the hole in the F & E to near the top.