Lockshield valve stuck after refitting rads

[intro2pete]

Hello! Desperately need some help if possible!

I've removed all the radiators in my new house to decorate (3 downstairs, 3 upstairs) all of which have lockshield vales. None of them were a problem to remove at all. I've now replaced the three upstairs and found that the lockshiled valves on all of them are seized solid. The manual valves opened up no problem and water flowed into the rads, but I cannot budge the lockshiled valves. I was able to close them no problem, and they have been off for about two weeks. All three are literally solid and won't move even slightly. Have I made a major booboo by opening the manual valves first?

Any help and advice much appreciated!

 

[bengasman]

You will have to use more force or replace them.

 

[Whitespirit66]

Have you also tightened the gland nut? The gland nut is at the bottom of the spindle that you turn, where it enters the valve body.

Try loosening the gland nut slightly, and turning the spindle. If the gland nut weeps, tighten it SLIGHTLY until it stops.