| 摘要 |
PURPOSE: To provide a hold structure having a simple constitution to automatically align a valve body and valve seat in the structure where a ball valve body is held in a ball carrier driven by a diaphragm of a pressure adjuster. CONSTITUTION: In the pressure adjuster, a housing 11 is divided into first and second chambers 13 and 14 by a diaphragm 12. A ball carrier 23 is provided in the center part of the diaphragm 12, and a recessed part is formed in this ball carrier, and a ball valve body 18 is held freely movably in the direction crossing the axis by the recessed part and a ball holder 29. Even if the ball valve body 18 and a valve seat 17 are disaligned, the ball valve body 18 can be automatically moved concentrically with the valve seat because it can be moved in the transverse direction, and thus, the valve is surely closed. |
