Patent ID: 6971628

Claim:
A direct-acting electric operated valve in which a stem vertically reciprocates, a valve body reciprocates between a first valve opening and a second valve opening, a second passage is brought into communication with a main passage in a closed state of said first valve opening by said valve body, and a first passage is brought into communication with the main passage in a closed state of said second valve opening by said valve body, comprising: a cam mechanism for converting rotary reciprocating motion of a rotor driven by an electric motor into vertical reciprocating motion, and a spring mechanism provided between said cam mechanism and said stem, wherein if said cam mechanism moves upward, said stem is moved upward by said spring mechanism, said first valve opening is closed by said valve body, said stem is held upward by said spring mechanism and the closed state of said first valve opening by said valve body is maintained, if said cam mechanism moves downward, said stem is moved downward by said spring mechanism, said valve body closes said second valve opening, said stem is held downward by said spring mechanism, and the closed state of said second valve opening by said valve body is maintained, said cam mechanism converts the rotary reciprocating motion of the rotor into vertical reciprocating motion of a cam-receiving plate, the cam mechanism includes an eccentric cam that is retained at an upper retaining position which slightly exceeds a top dead center position and at a lower retaining position which slightly exceeds a bottom dead center position.