| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric proportional valve, capable of minutely adjusting flow rate without complicated control while attaining reduction in manufacturing cost and size thereof. SOLUTION: The electric valve can be reduced in manufacturing cost and size. A rotating force output from a stepping motor 33 is transmitted to a bar-like spool 32 through a shaft 34, and the communication amount of a through-hole 71 and a communication path 38 is changed according to the rotation amount of the spool 32 without complicated control, whereby flow adjustment can be minutely performed. Leak of fluid in valve opening is permitted to some degree, whereby the structure is simplified, compared with a case using a ball-like valve element, a seal material or the like, and the rotating force necessary for drive can be reduced. Therefore, the reduction in manufacturing cost and size can be attained. COPYRIGHT: (C)2011,JPO&INPIT
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