Patent ID: 7325784

Claim:
A ball valve, comprising: a first valve casing made of a thermosetting resin, comprising: a first ball seat; a first coupling flange provided around the first ball seat; a first lever receiving part provided on a predetermined portion of the first coupling flange; a first ring-shaped groove provided along both the first coupling flange and the first lever receiving part and having a semicircular cross-section; a plurality of first coupling holes provided on the first coupling flange; and a first stopper provided on an end of the first lever receiving part; a second valve casing made of the thermosetting resin and provided to be symmetrical to the first valve casing, comprising: a second ball seat; a second coupling flange provided around the second ball seat; a second lever receiving part provided on a predetermined portion of the second coupling flange; a second ring-shaped groove provided along both the second coupling flange and the second lever receiving part and having a semicircular cross-section; a plurality of second coupling holes provided on the second coupling flange; and a second stopper provided on an end of the second lever receiving part; a ball seated in both the first ball seat of the first valve casing and the second ball seat of the second valve casing to control a flow of a fluid; a control lever coupled to the ball to control the ball, with a stop projection provided on a predetermined portion of the control lever to engage with the first and second stoppers of the first and second lever receiving parts; a ring unit seated in both the first ring-shaped groove of the first valve casing and the second ring-shaped groove of the second valve casing, the ring unit comprising: a first ring part seated in parts of both the first and second ring-shaped grooves provided on the first and second coupling flanges; and a second ring part integrally coupled to the first ring part and seated in parts of both the first and second ring-shaped grooves provided on the first and second lever receiving parts; and a cap fastened to both the first and second lever receiving parts.