Ball valve

A ball valve comprising:

• a housing integrally provided with a valve chamber in its center portion, an inlet portion and an outlet portion for liquid respectively formed at two sides of said valve chamber, and a shaft hole formed in an upper center wall just above said valve chamber;
• a valve member having a valve portion and a shaft portion extending up from said valve portion, said valve portion having a cavity able to align or not to align to said inlet portion and said outlet portion of said housing so as to form or not to form a passageway for liquid to flow through said inlet portion first and then through said cavity of said valve portion and then out of said outlet portion of said housing;
• said shaft portion extending up from said valve portion and through said shaft hole of said housing to protrude out to combine tightly with a grip, an anti-leak gasket fixed around a lower end of said shaft portion for preventing liquid from flowing or seeping through a gap between said shaft portion and said shaft hole of said housing, a soft gasket fixed around said shaft portion under said anti-leak gasket;
• said grip possible to rotate said shaft portion together with said valve portion of said valve member in said housing for opening and closing said ball valve, and said soft gasket reducing friction between said shaft portion and said shaft hole to smooth the opening and closing action of said ball valve;
• wherein an outer dimension of said valve portion is larger than an inner dimension of said inlet portion, larger than an inner dimension of said outlet portion, and larger than an inner dimension of said shaft hole.