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One, wear due to hard seal ball valve spool is alloy spray-welding, sealing rings are alloy steel welding, hard seal ball valves can switch without causing too much wear. (Hardness coefficient of 65-70):

Two good sealing performance due to using artificial grinding hard seal ball valve seal is, until the valve and sealing ring fully before use. So he is the sealing property is reliable.

Three switch light; because hard seal ball valve sealing ring at the bottom using springs that keep the seal and poppet tightly together, so the external power switch when the preload of the spring is very light.