stem assembly

Abstract

The invention relates to a valve rod assembly. The valve rod assembly comprises a valve rod base, a valve rod and a box cover, wherein the valve rod base is provided with a sliding chute, the head portion of the valve rod is contained in the sliding chute of the valve rod base, the box cover is matched with the valve rod base, and an eccentric gear is rotationally installed on the inner side of the box cover. The valve rod comprises a rod body and a blocky sliding head, wherein the sliding head is arranged at one end of the rod body, a through hole is formed in the sliding head, the eccentric gear comprises an eccentric shaft, the eccentric shaft penetrates through the through hole of the sliding head to drive the valve rod to slide in the sliding chute, the sliding head comprises two first side faces which are located on the two sides of the rod body respectively and parallel to the axis of the rod body, and outward protrusions perpendicular to the first side faces are arranged on the first side faces. According to the valve rod assembly, the protrusions are exquisitely added on the first side faces on the basis of a traditional blocky head of a valve rod, the contact area between the first side faces and the corresponding face of the valve rod base can be decreased, the contact closeness between the first side faces and the corresponding face of the valve rod base is improved, sliding fit can be smoother, fluid can be smoothly controlled easily, the service life of the valve rod assembly can be prolonged, and safety is improved.

Description

technical field [0001] The present invention relates to valve components, and more particularly to valve stem assemblies. Background technique [0002] The valve stem is an important part of the valve. It is used for transmission. One end is connected to the actuator or handle, and the other end directly drives the valve core to move or rotate to realize the valve switch or adjustment function. The valve stem box is used to accommodate the valve stem and limit the movement of the valve stem. It usually includes a valve stem seat and a box cover. The cooperating sliding between the valve stem seat and the valve stem guides the movement of the valve stem. But the sliding head of existing valve stem, its two sides that contact with valve stem seat are smooth surface, and contact area is big, has increased friction force on the one hand, shortens the life-span of valve stem and valve stem seat, on the other hand in order to guarantee sliding head The close contact between the ...

AI Technical Summary

Problems solved by technology

But the sliding head of existing valve stem, its two sides that contact with valve stem seat are smooth surface, and contact area is big, has increased friction force on the one hand, shortens the life-span of valve stem and valve stem seat, on the other hand in order to guarantee sliding head The close contact between the side and the valve stem seat requires high processing requirements for the flatness of the corresponding side of the sliding head, which is usually difficult to guarantee, thus affecting the smoothness of sliding

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