The Versatility of Soft Seated Shut-Off Valves
If you are looking for a shut off valve, a soft-seated shut off valve is a better choice than another material or valve type. The reason for that is simple. It has the ability to make the highest level of seat leakage class possible, and their rubber seat folds into the shape of a lip every time to ensure full closure of the valve.
If your aim is to achieve a tight shut off, then soft-seated shut off valves are the best at achieving that.