Corliss Engine

—A steam engine fitted with Corli valves. These are usually four in number for each cylinder, a separate steam and exhaust valve being provided at each end. The valves are shaped as a sector of a cylinder and rotate within a cylindrical seat over ports in line therewith. The admi ion valves are not in positive connection with the valve gearing, but are tripped or disengaged at a point in the stroke determined by the governor or by hand, the closing being effected by a spring or equivalent device, thus giving a uick cut off, variable according to the load. he orli valve has the advantage of requiring httle ower to drive it, and has minimum clearance lo es.