V-shaped structure valve rod sealing padding

Abstract

The invention relates to a V-shaped structure valve rod sealing padding. The V-shaped structure valve rod sealing padding comprises an upper padding unit, a middle padding unit and a lower padding unit which are sequentially arranged on a valve rod from top to bottom in a sleeving mode and stacked. The upper padding unit comprises an upper padding ring. The upper end face of the upper padding ring is a plane, an annular groove sunken upwards is formed in the lower end face of the upper padding ring, and the section of the annular groove is in a V shape. The middle padding unit comprises a plurality of middle padding rings sequentially stacked from top to bottom. An annular protrusion protruding upwards is formed in the upper end face of each middle padding ring, and the section of the annular protrusion is in a V shape. An annular groove sunken upwards is formed in the lower end face of each middle padding ring, and the section of the annular groove is in a V shape. The lower padding unit comprises a lower padding ring. The lower end face of the lower padding ring is a plane, an annular protrusion protruding upwards is formed in the upper end face of the lower padding ring, and the section of the annular protrusion is in a V shape. The V-shaped structure valve rod sealing padding has the advantages that the padding is radially deformed when stressed axially through the angle difference of the sunken and protruding V shapes, sealing of the valve rod of a valve is facilitated, and sealing is reliable.

Description

Technical field [0001] The invention relates to a valve, in particular to a valve stem sealing packing with a V-shaped structure. Background technique [0002] In order to ensure the sealing of the valve stem of the moving parts in the working state, a packing seal must be installed on the upper part of the valve body. The sealing device is composed of packing pressure plate, packing pressure sleeve, lock nut, packing and other components. The sealing force can be compensated after relative wear. Generally, a set of springs will be added under the lock nut to ensure that the energy of the spring is released after the valve is worn out, so as to ensure that the packing has a sustainable pre-tightening force. Ensure the reliable sealing of this part. [0003] At present, the common packing used on the valve is PTFE or flexible graphite. Among them, most of the flexible graphite packing is a ring structure arranged on the upper and lower planes, such as figure 1 As shown, and for a s...

AI Technical Summary

Problems solved by technology

The graphite packing with this structure is not easy to deform when subjected to axial pressure during the working process, which is not conducive to the sealing of the valve stem. In addition, because the graphite packing adopts the axial wrapping method, it is easy to Generate positive pressure on the surface of the valve stem, increasing the frictional resistance of the valve stem movement

Images