Concealed push button valve water hammer

[got_any03]

I have installed the 3 button version of this valve I've put non returns on the hot and cold supplu and a shock arrestor on the main as I've just installed a new combi as well. When I turn off the button s I'm getting quite a bad thud when doing so. I've fitted another shock arrestor to the rainfall head to see if it stops it but it doesnt. Anybody any ideas so solve this.

Thanks

 

[townfanjon]

Loose pipe , or not enough pipe clips probably