Patent ID: 6966538

Claim:
A gate valve comprising: a valve rod provided so as to be capable of rotating a valve plate having first and second tapered valve plate surfaces capable of ascending and descending in a valve box having first and second openings; a rotatably-supporting member for rotatably supporting the valve rod; a raising/lowering cylinder provided on the rotatably-supporting member and adapted to raise and lower the valve rod; a pin engaged with an elongated hole of the valve rod; a lateral actuator having the pin and capable of reciprocating in a lateral direction perpendicular to the longitudinal direction of the rod; first and second stoppers provided on the sides of the lateral actuator; and first and second lock cylinders connected to the first and second stoppers, wherein one of the lock cylinders is operated, with the valve rod raised by the raising/lowering cylinder, to thereby cancel the engagement between the second stopper and the lateral actuator, and wherein, by laterally moving the lateral actuator, the valve rod is tilted to thereby put one of the first and second valve plate surfaces onto one of the first and second openings to close the gate valve.