Old delta scald guard won’t turn off. Need help with ID and next steps

[Griffeyrvd]

Hey everyone, thanks in advance for any help you can offer

Right now this shower won’t turn off. In the OFF position, it will fully flow cold water. When I then turn the knob ON, it will flow hot water as well. Turn the knob off again and it will go back to cold. To stop the flow i turned off the cold water line in my basement. Now it stopped running, but if I turn the knob ON it will flow very hot water.

I’ve attached some pics here of the faucet
http://imgur.com/a/IJnKUAa

Any idea what kind of fix I may need? What kind of faucet is this and where to go from here?

Thanks again!

 

[Geofd]

behind the handle there should be a stem with a ball with slotted holes in it behind the ball there are rubber caps and springs on the body of the valve there should be a small brass tit...that the ball sits in its a curved slot on the ball that goes were the brass tit is

 

[Jamesplumbing06]

It’s a early 90s delta. Pressure balance. ( that didn’t balance anything hence your getting hot water without cold on. ) that one is the springs for delta but not a ball but a triangle plate that glides on a ball joint of sort. You just need to take it all apart. DO NOT USE PLIERS. Get a good strap wrench. That ring if never been pliered should just be snug.

Repair Kit For Delta Faucet RP1991 Shower Cartridge - Includes Seats and Springs https://www.amazon.com/dp/B00F2I6ZQI/?tag=skimlinks_replacement-20