hot water heat

I have hot water heat, baseboard in front of house and cast iron in bedrooms. The trobel is when the thermostat is set to 68 the bedrooms are as mutch as 10@ higher than the rest of the house..I tried to turn down the valve on the radatiors but it has no effect they are still hot..should I be able to turn off the water through the radatior.

Greetings ssgdul welcome to the Forum.

I would be very surprised if you couldn't valve the system off from the Boiler !

However, shouldn't there be a Diverter Valve somewhere in the System, to do balancing like you need ?

Have a good Day !
S.W.

Thanks for the reply My system appears to be one zone turning down heat from boiler affects the whole system,front rooms as well as the bedrooms,, was wondering if the valves on the cast iron radatiors might need to be replaced there are probley 50 years old..I have heard of thermostats than regulate room temp so you dont have to keep adj valves ..thought of replacing with baseboard but need the wall space ..SSG

SSG,

As far as replacing the old valves...
If they still work, then why would you do that ?

Half closing Valves, is not good for them, unless the Valve was designed to do that.
You'd be amazed how water can cut a Valve seat and ruin the Valve, then, if you needed repair, you couldn't shut it off completely.

Besides the Thermostatic Valve you mentioned, here's a couple other things...

Put a second Valve in-line, and use it as the Flow Control, leaving the first Valve to shut the equipment off, when repair is needed.

Or, you could re-Pipe the unit, putting in a short smaller piece of pipe in-line, reducing the Flow, like an Orifice. You'd have to do some math on that, to make sure you didn't over/underdo it.

Again...
Unless designed specifically, Valves are supposed to be fully open, or fully closed, no exceptions!
My best offers.

Have a good Day !
S.W.