| 摘要 |
To prevent fluctuations of set flow rate in a control valve, even when the valve handle is locked, a flow rate control valve is disclosed which is designed to lock the handle for rotating the stem to a bonnet side of the valve by means of a lock screw. The handle is composed of a handle main body fixed to the upper end of the stem, and a tubular lock handle coupled to the lower end of the handle main body. The handle is movable in a direction orthogonal to the axial line Y of the stem, and encloses the upper outer circumference of the bonnet, and wherein the lock screw is provided in the lock handle in a direction nearly orthogonal to the axial line Y of the stem.
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