MZ and M series portable valve grinding machine are both for grinding gate vavle,

Valve seat,valve core.

The Difference between M and MZ valve grinding machine are mainly in the grinding disc and the means of transmission

The adjustable grinding disc of M series  is  adjustable planet grinding disc,

It is transmitted by Gear transmission,when Grinding disc is roating with the grinding claw autoroation.make the face being  grinded reticulate.the quality of grinding is better,high efficiency.But if you can't operate correctly,the gears are easy to be damaged

 The grinding disc of MZ series valve grinder   is  only for Alumium Disc, Chain transmission ,although the quality of grinding is also good,but M series better.The chains are not easy to be damage.