| 摘要 |
A choke valve having a valve body in which is a valve chamber with in inlet and an outlet. A valve seat is carried in the valve chamber. A flow control member is also carried in the valve chamber for axial movement with respect to the valve seat from a closed position, preventing flow of fluids from the valve inlet to its outlet, and selected open positions which provide predetermined flow areas through which flow and pressure throttling of fluids may occur. A non-rotating stem assembly is attached to the control member for axial movement thereof. A valve bonnet is attached to the valve body and provided with a throughbore in which the stem assembly may slidingly reciprocate while positioning the flow control member. A rotating driver assembly is supported from the valve bonnet and includes a nut member threadedly engageable with another end of the stem assembly. The nut translates rotational movement of the driver assembly to axial movement of the stem assembly and the flow control member attached thereto. An operating device is attached to the driver assembly for rotation thereof.
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