| 摘要 |
PURPOSE:To easily and reliably adjust a flow rate, by appropriately setting the pitch of a helical guide groove on the inner peripheral surface of an opening regulating ring having an outer peripheral surface marked with equally-divided graduations. CONSTITUTION:With an opening regulating ring 16 turned, a movable valve seat 7 moved to a flow-in pipe side through a guide rod 12, and in a position where the valve seat abuts on a contact part 25 mounted in a valve chamber 1, a reference line 28 is marked in the position corresponding to the zero point of equally-divided graduations 20 with which the outer peripheral surface of the opening regulating ring 16 is marked. Thereafter, the opening regulating ring 16 is turned in an opposite direction by 360 deg., and a fixed valve body 4 is moved until a conical tapered part 6 of the fixed valve body 4 abuts on the conical tapered part 8 of a movable valve seat 7 located in aforesaid position of the opening regulating ring to secure the fixed valve body by means of a lock nut 27. |
