All fitures in house get hot enough water except shower. Hotter for few seconds then becomes not hot enough for a good shower. Shower has a single turn on center valve. A full turn on to left is hottest. Both pipes are 3/4 inch and it seems to get more cold than hot water.?

Is there a skald guard or a posi-temp feature on your shower valve? What's the brand name? Regards Tom

Believe it is a price fixter from henry plumbing, about eight plus years old. Where would I look for info on valve.