A damper control "actuator" will control a gas valve, pids are set up to run them. Much better control if your actuator has slidwire feedback, should see a pot on the actuator or come up with a way to add one. This lets the controler know how open the valve is. You would need a gas valve that is full on and full off in 90 to 360 degs. The actuators I use at work either swing 90 degs or 180 degs, you can move the stops and get a smaller swing. I have not been able to find a valve that will do this. On my roaster I installed a 3/8 needle valve but the adjustment full on to full off is only maybe 10 degs, I need more swing.