Replacing drain-off valve

[Alan H]

I'm replacing a rad in the hall (it's the always-open one in the system) that has a separate drain cock just before the manual valve - see photo:

I'll be replacing the drain cock as it's ancient. I can use a standard drain cock (eg a basic Screwfix one) but I see there are some manual heads with built-in drain-off valves (eg this one or this one) that would probably be neater.

I think these are really for draining off the rad but would it work as a system drain if the manual head was open?

 

[ShaunCorbs]

There for either tbh more better than a stnd drain off

 

[Alan H]

There for either tbh more better than a stnd drain off

That's what I was thinking - if I was draining down the whole system, that rad would be open anyway.

 

[Alan H]

Just realised the links in my first post didn't get through - but it doesn't matter.

A slightly different question: as I implied, this rad won't have a TRV as it's the bypass rad in the system. Should I simply put a lockshield valve at both ends (with one to set the flow and the other fully open) or just at one end with a manual valve at the other?

 

[ShaunCorbs]

Yes

 

[Alan H]

Yes

Sorry, lockshield at both ends or at one end with a manual valve at the other? The ones with the built-in drain seem to be manual valves so would probably prefer that.

 

[ShaunCorbs]

Both lockshield eg both manual

 

[Alan H]

Both lockshield eg both manual

Great! Thanks for your help, Shaun.