Meynell Safemix V6 Exp/rec Thermostatic Mixing Valve

These knobs can be difficult to remove.

Once the grub screw is removed then two screwdrivers leveredforward between the valve and the knob should do it.

If that doesn’t work then try a few kettles of boiling waterpoured over the knob that may expand it just enough to release it.

If that doesn’t work then you could try direct heat howeverbe care full not to damage the knob.

If that doesn’t work you have two options TNT or cut theknob off with a hack saw (being careful not to damage the valve head work) andreplace the knob.

This is the link to the thermostat.

 http://www.showerdoc.com/shower-spares/meynell/MIRA-122-70-Mira-Thermostat-122-70

This valve more usually needs a strip down clean lube and a new seal kit fitted.

http://www.showerdoc.com/shower-spares/meynell/MEYN-PARENT-29-Meynell-Safemix-V6-Exp-rec-Thermostatic-Mixing-Valve

If you fitted the V8 you would have to alter the pipe work....which you probably don’t want to do and the V6 is unavailable so it would make sense to repair the V6.

Most of the parts are available for the V6 you don’t mention what the fault is with your shower however most respond well to a strip down clean lube and the fitting of a new seal kit.

You say that you don’t have the serial number of the valve I of course can’t be sure however the balance of probability is that it will be 18000 onwards.

The Serial number is normally on a label stuck to the inside of the control knob

Your serial number is below 18000 therefore you would need this seal kit

http://www.showerdoc.com/shower-spares/meynell/MEYN-SPSK0014J-Meynell-Seal-Kit-V6---(2574---18000)-Components-A-SPSK0014J

The serial number is only needed when ordering seal kits or Thermostatic internals. Here is some Info regarding serial numbers for the Meynel V6 shower exposed or recessed below:

For serial numbers between 0 - 2574 you need to order the internal set SPTS0001P

For serial numbers between 0 - 18000 the internal set will work but wont fix a leaking shower and the seal kit will be needed and the head assembly.

For serial numbers between 2574 - 18000 you need to order seal kit SPSK0014J

For serial numbers from 18000 onwards you need to order seal kit SPSK0043J

Please Note: That if you shower is dripping from the head when switched off you will need to replace the head assembly SPHD0013J and the serial number doesn’t matter.