stop cocks

[cardiy]

http://www.screwfix.com/prods/43118/Plumbing/Brassware/Comap-Cu-x-Cu-Lever-Ball-Valve-Water-15mm
,what does cuxcu mean? are these better than the old style stopcocks thanks.
http://www.screwfix.com/prods/13103/Plumbing/Brassware/Full-Ball-Valve-15mm
so this one can be used on gas and water?

 

[adlplumbing]

cuxcu is a make me thinks
and not stop tap it leaver valve
does a simlair job

 

[tamz]

copper to copper

 

[cardiy]

Can they both be used on mains pressure cold water?

 

[tamz]

yes

 

[compheat]

A stop tap must be used as the cold main enters the premises after that you can basically use what you want

 

[JohnD]

I am not a plumber but I understand your main stop cock is supposed to be one of these

I understand they still work to securely cut off the water even if the jumper or washer comes loose

also, the rotating-ball type valves (unless full bore) obstruct the water flow to some extent which is tiresome if it is the whole house supply, because the hole in the ball is a lot smaller than the pipe.

 

[cardiy]

Cheers all,john i didnt realise about the bore size been restricted on some of these ball type valves, what is the reason for this?

 

[JohnD]

I suppose it is just the way they are made, to get a 15mm hole through a ball, the ball would have to be quite a bit bigger, and the housing it fits into bigger still.

they are especially a nuisance on bath or shower pipes where you need a good flow. A gate valve does not obstruct, and allows you to control flow if you need to, but it does not shut off as tightly as a stopcock, but is OK for servicing and changing tap washers where a slight drip does not matter while you are working.

 

[Servotech]

Here's a little quiz for you.

What is the difference between a cock and a tap?


No, don't laugh it's a proper question!

 

[sooey]

I'll take a guess, a cock has a loose jumper.

 

[Whitespirit66]

cuxcu is a make me thinks

It's the chemical symbol for copper. (Cuprium = Latin for copper)

In this case, it means copper X copper, ie. copper pipe in each end.

See, I did lurn summat at skool.

CU Jimmy!

 

[JohnD]

does a tap have a water outlet with no facility to attach something to it? for example a stop cock has a pipe going in and a pipe going out, and a bibcock has a thread to attach a hose to the outlet, but a bath tap has a pipe going in and the water just gushes out the other side?

 

[Servotech]

Here we go!

I thought you lot would like this one.

A cock takes 1/4 of a turn to turn it off or on.

A tap takes full turns between on and off.

You can have a gas cock but never a stop cock!

 

[sooey]

A cock takes 1/4 of a turn to turn it off or on.

So ceramic disc sink taps are really sink cocks?