Low-load type cut-off butterfly valve

Abstract

The invention relates to a low-load type cut-off butterfly valve, in particular to a low-load cut-off butterfly valve which is developed for working conditions that the nominal pressure is low and cutting off is required, and belongs to the field of fluid control valves. A valve plate is mounted in a valve body; the valve body comprises sleeves provided with stuffing boxes, a stuffing component is arranged in each stuffing box, filler pressure plates are arranged on the outer side of the stuffing components, and the filler pressure plates are fixed at the end parts of a first sleeve and a second sleeve through screw rods and lock nuts; a first shaft hole and a second shaft hole are formed on the valve body, wherein the first shaft hole and the second shaft hole penetrate the first sleeve and the second sleeve respectively, a valve rod is arranged in the first shaft hole, and a driven shaft is arranged in the second shaft hole; a valve seat is arranged in the inner chamber of the valve body; the upper end and the lower end of the valve plate are in rotational connection with the valve rod and the driven shaft respectively; the valve seat is embedded in the inner chamber of the valve body to form a certain angle; the valve plate is an integral part with a triple eccentric structure; and when at open and middle positions, the valve seat is not in contact with the valve plate and dose not interfere with the valve plate.

Description

technical field [0001] The invention relates to a low-load cut-off butterfly valve, in particular to a low-load cut-off butterfly valve developed for working conditions where the nominal pressure is low and cut-off is required, and belongs to the field of fluid control valves. Background technique [0002] With the development of the economy, the level of industrial automation control is constantly improving, so the requirements for the reliability and economy of the control valve in the process control are also constantly improving. This also puts forward higher requirements on the structure of the valve body. In the prior art, the existing low-load butterfly valve has a large leakage, which cannot meet the requirements of the working conditions on the leakage level. Double eccentric butterfly valves or triple eccentric butterfly valves use built-in bushings as guide bearings, which cannot withstand high temperatures, and materials are easily stuck, and the manufacturing c...

AI Technical Summary

Problems solved by technology

In the existing technology, the existing low-load butterfly valve has a large leakage, which cannot meet the requirements of the working conditions for the leakage level

Double eccentric butterfly valves or triple eccentric butterfly valves use built-in bushings as guide bearings, which cannot withstand high temperatures, materials are easily stuck, and the manufacturing cost is high, which is not conducive to customer choice

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