Refill valve is a very important component in your toilet since it fills the tank of the toilet after every flush. This valve uses a float to turn the water on and off. This is a plumber related work, only a professional plumber can repair it.
alliedallcityinc.com
there is a blockage either in supply pipe or refill valve.
Just replace the ballcock valve..
That device is called the refill tube. This allows water to go down the overflow tube to refill the water closet bowl while the tank is filling.
replace the fill valve
Diaphram? I'm not sure what part you are talking about. Normally replace the fill valve with a Fluidmaster 400a, new supply line, and the flapper with the proper one for your toilet.
Have the new valve in hand. Cut the toilet water supply off at the commode, or even at the street meter box.Remove water tube or pipe supply and old flush valve. Install new valve and new supply line if required.
First check to see if the valve for the water supply is turned on. If that isn't the problem you may need to replace the tank water valve, they do wear out and are not that expensive or difficult to replace.
You would replace a flush valve or 'flapper' when it gets distorted or leaks slowly as they all eventually do. Take it out and go to Home Depot and you will see many better ones than there were when your toilet was made. Average cost $6-10.
Replace the fill valve or throttle down the isolation valve
I think your fill valve is clogged with seddiment.Just replace it.
Shut the water off at the main shut off where it comes into the house or at the meter and change the valve at the fixture. The valve at the fixture may be sweated on, compression, or threaded.
Which part, the tank or the bowl? If it's the tank, you have a problem with a restriction between the tank and the bowl. If it's the bowl, you have an obstruction in either the neck of the toilet or the drain pipe below the toilet.