| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum pressure proportional control valve, a valve body and a method of forming a flow passage of the valve body, which can secure conductance and reduce the size.SOLUTION: A valve body 2 of a vacuum pressure proportional control valve 1A has first and second ports 21, 25 formed on the same axis, a bottomed opening part 23 formed in a direction orthogonal to the axis of the first and second ports 21, 25, a valve hole 22 formed on the same axis with the bottomed opening part 23 and communicating with the first port 21, a valve seat 26 provided along the circumference of an opening portion where the valve hole 22 is opened in the bottom wall 23a of the bottomed opening part 23, and a U-shaped flow passage 24 providing communication between the bottomed opening part 23 and the second port 25. The U-shaped flow passage 24 has a U shape in which a loop is opened to a first port side, is formed along the axis of the bottomed opening part 23 on the outside of the valve seat 26 and is opened in a bottom face 2b of the valve body 2. A closure member 27 is installed to the bottom face 2b to close the U-shaped flow passage 24. |
