Magnaclean Shut Off valves not working

[Caesar]

Dear All

I have a Magnaclean unit fitted on the Boiler Pipe which is situated on the wall in the garage. I would like to clean the unit but when I try to close the Magnaclean Valves they just spin around! The unit unfortunately has been placed in a very awkward position so cannot see any marking on the valves to show whether they are open or shut!

Any advice would be greatly appreciated, many thanks.

 

[stem]

They do spin around and around, to give 2 on and 2 off positions in every complete turn. In the base of the black knobs there are cutouts that you look through to see the two 'off' positions. Could you use a small mirror to see? the text will be backwards of course

I imagine this is because of the many positions the valves can be installed in can limit access. A quarter turn in either direction results in them being off.

 

[htgeng]

loosen the bleed screw on the top. Then turn your valves. When the water stops, you know you've isolated it.

 

[Caesar]

Hi Stem and Htgeng

Many thnaks I will try as you both have suggested.