radiator valves - which is which? Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[foxspurs]

I am balancing my central heating radiators. I understand the difference between Lockshield and Wheelhead valves BUT my valve caps are all missing so is there an easy way to identify which is which?
eg Is the radiatir bleed-valve always on the same side of the radiator as the Lockshield valve? or is the Lockshield valve always on the side of the radiator where the pipe ( inlet pipe? ) heats up first, once the system is turned on?
Any advice appreciated.

[nitro23456]

NORMALLY a wheelhead or trv are on the flow and the lockshield is on the return.

[htg engineer]

Both valves are the same, the only difference being the lockshield has a cap to stop the valve being altered. The wheelhead can be turned to turn radiator on and off.

htg

[plumbbob]

The lock shield in a text book installation is fitted in the return side which is the colder end.