| 摘要 |
PURPOSE:To improve further the flow rate characteristics of a pressure reducing valve where the movable wall of an operation part is connected to an operation rod which transmits the displacement of the movable wall to a main valve body through an approximately hemispherical surface, by providing plural rectifying blades at least at the inside of the main valve port and in the axial direction. CONSTITUTION:A columnar piston rod 12 is connected to the lower end wall of a piston 120 coaxially on a hemispherical surface. A piston ring 14 serving as a packing is provided between the outer circumference of the piston 120 and a cylinder 122. An orifice 16 is formed to the lower surface side of the piston 120. The tip of the rod 12 pierces through a valve port 114 and touches a center projected bar 20 of a valve body 118. Four rectifying blades 21 are set at the outer circumference of the bar 20 equidistantly and 90 deg. spaces secured with each other. In this case, the rod 12 can be extended with addition of the rectifying blade in case a main valve projected bar is not provided.
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