A Side Stem Forced Seal Ball Valve

Abstract

The invention relates to a side valve rod forced seal ball valve. The side valve rod forced seal ball valve comprises a valve body, a first valve seat and a valve ball; the first valve seat moves backand forth in the direction of the valve ball and engages with the valve ball to realize forced seal; the side valve rod forced seal ball valve is provided with a first driving wheel and a second driving wheel, wherein the first driving wheel is used for driving the first valve seat to move, and the second driving wheel is used for driving the valve ball to rotate; the first driving wheel and thevalve seat are coaxial; and the first driving wheel drives the second driving wheel to rotate and is driven by a side valve rod to rotate. The side valve rod forced seal ball valve has the beneficialeffects that the valve ball is driven to rotate through the second driving wheel, the second driving wheel and the valve rod do not bear the pressure generated when the valve ball is at the closed position, and therefore the operation torque is remarkably decreased, and the phenomenon that the forced seal operation of a valve is hindered due to the pressure borne by the valve ball can be avoided;and the valve rod drives the valve ball to rotate by driving the first driving wheel, so that a transmission structure can be more compact and can be adapt to more valve body structures, a driving structure of the valve ball can also be more reasonable, and the reliability can be higher.

Description

technical field [0001] The invention belongs to ball valves, in particular to a side valve stem forced sealing ball valve. Background technique [0002] In some fluid control fields, there are strict requirements on the valve's switch control and closing tightness, requiring the valve to be able to generate as little pressure drop as possible in the straight-through state, and to provide a forced torque seal that is not affected by the pipeline medium pressure. Positive sealing ball valves are recognized as the ideal solution. Such as figure 1 As shown, the original forced sealing ball valve adopts the sealing method driven by the valve seat. While driving the valve ball to rotate, the valve stem also drives a valve seat driving ring to rotate, and the valve seat driving ring drives the valve seat to the valve ball through threads. When the valve ball is closed, it will engage with the valve ball to achieve a forced seal. In the structure of this forced sealing ball valve...

AI Technical Summary

Problems solved by technology

Since this structure sets the stem drive wheel between the valve ball drive wheel and the valve seat drive ring, there is not enough space in the valve body to realize the above structure when it is applied to a ball valve with a small diameter, or it will affect the structural strength of the valve.

In addition, the above-mentioned structure needs to adopt a top-mounted valve body structure, which makes the valve body structure more complicated and increases the cost of processing and manufacturing.

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