Simultaneous Peripheral Operation On-Line and its production manner null for Simultaneous Peripheral Operation On-Line valve

摘要

PURPOSE: To make manufacture easier by arranging on the spool at least one annular land having at least one conical notch extending from the outer periphery to the interior. CONSTITUTION: A spool 1 has annular lands 2. Each of the lands 2 has on its side surface a plurality of notches 3 extending to the interior in the radial direction. Each of the notches 3 has outer conical portions 4 and inner conical portions 5, of which the conical angles are 360 degrees/N (N is the number of notches). The outer conical portions 4 are separated by edges 6. The angles between the notches 3 are predetermined. Thus, it is possible for the fluid flowing through the spool valve to flow at the highest speed, and possible to obtain a spool with large mechanical strength.