This is called a reseating tool and is used to grind away cracks on the seat of a tap or valve.
There is an issue here that is not being discussed. If you grind the valve seats, for what ever reason, you must grind the valves also, otherwise you will not have a matched valve and seat assembly. Doing one without the other, will be a learning curve you don't want to experiment with. If the valve and seat do not match perfectly, your just spinning your wheels as the end result will be a whole lotta work for nothing. When you think about the massive pressure's and extreme heat that is created during the combustion process, that last thing you want is a set of mismatched valves, trying to hold it in the cylinder area. Also lets not forget about the fact that when you grind a valve seat, your allowing the valve to seat deeper into the head and the last time I checked they don't sell valve stem lengthening kits. You are not moving the camshaft, it stays the same, but the valve stem moves farther away from the cam when you grind the valve seats. So if ya hear a bunch of clackey valves when you first start the engine, you will understand why they don't sell valve lengthening kits.
it is a tool that resurfacese the seat on a water faucet valve
The optimum way is to remove (unscrew with a seat wrench) the seat and replace it. A seat cutter tool may be used to refinish the seat in place.
Yes it can be repaired to a point. There is a tool called a reseater which grinds the valve seat to make it smooth and grind out fine cracks. The seat can only be reseated a number of times before its too flat in which case the tap would then need to be replaced.
It is the "Advertised duration", used by the factory. It is the Valve timing from when the valve is .006inches off the valve seat to .006" off the valve seat.
yes
The valve face
Better heat distribution. The exhaust valve sees a lot more heat.
the valve transfers the heat to the valve seat (when the valve is closed)
shredder valve.
A valve spring compressor
Doppler echocardiography is the preferred diagnostic tool for evaluation of mitral valve stenosis
Valve taps often occur as a result of a misalignment in the fitting they are in, or a worn out valve seat. In many cases, a new valve spring and cam adjustment will fix the problem, but if it the result of a worn out valve seat, it will have to be machined.