Control valve.

摘要

A control valve comprises a valve body having a fluid channel and a valve seat; a valve operating part (B); a valve stem supporting member (3) having its upper end fixed to the valve operating part (B) and its lower end fixed to the valve body (A); a valve stem (20) penetrating the valve stem supporting member and having its upper end part connected to the valve operating part and its lower end part entering the valve body, the valve stem being movable upward or downward by the valve operating part; and a valve element attached to the lower end of the valve stem. The valve element is moved upward or downward by moving the valve stem upward or downward, the valve element being brought into contact with and seated in the valve seat to close a fluid channel as it is moved downward, the valve element being detached from the valve seat to open the fluid channel as it is moved upward. The valve stem (3) supporting member has an upper tubular body (14C) and a lower tubular body (14A), the upper tubular body (14C) having its upper end fixed to the valve operating part (B) and its lower end detached from the valve body (A), the lower tubular body (14A) having its lower end fixed to the valve body (A) and its upper end detached from the valve operating part (B), the two tubular bodies being spaced apart each other, the lower end part of the upper tubular body and the upper end part of the lower tubular body being connected by a connecting member (17).