Double-clip type butterfly valve with leak-proof valve seat having reliable sealing performance

Abstract

The invention relates to a double-clip type butterfly valve with a leak-proof valve seat having reliable sealing performance. The double-clip type butterfly valve comprises a circular-ring-shaped valve body provided with an upper valve neck and a lower valve neck, a circular-ring-shaped valve seat embedded into the inner wall of the valve body, a butterfly plate, a valve rod and a transmission device. The valve seat is composed of a framework and an integral sealing rubber sleeve integrated with the framework, wherein the sealing rubber sleeve consists of an inner wall sealing rubber layer and two end face sealing rubber layers of two end faces. The double-clip type butterfly valve is characterized in that the end face sealing rubber layers are respectively provided with circumferential epitaxial edges wrapping the end faces of the circular-ring-shaped valve body, the epitaxial edge on one side is a fixed epitaxial edge connected fixedly, and the epitaxial edge on the other side is a movable epitaxial edge connected detachably. The movable epitaxial edge is pressed into a stopping opening formed in the end face of the framework through a circumferential boss arranged on the inner margin and sleeves on the outer margin of the corresponding end face sealing rubber layer in an interference mode, a circumferential convex rib is arranged on the circumferential boss, a circumferential groove is formed in the inner wall of the valve body, and the circumferential convex rib is clamped into the circumferential groove. The double-clip type butterfly valve has the advantages of being capable of effectively preventing leakage.

Description

technical field [0001] The invention relates to the field of butterfly valve manufacturing, in particular to a wafer type butterfly valve with a reliable sealing and anti-leakage valve seat. Background technique [0002] Due to its simple structure, easy operation, quick opening and closing, and good flow regulation function, butterfly valves are widely used in petroleum, gas, chemical, water treatment and other fields. Wafer butterfly valve is a commonly used butterfly valve, such as figure 1 As shown, it mainly consists of an annular valve body 2a with upper and lower valve necks 3a, 8a, an annular valve seat 4a embedded in the inner wall of the valve body 2a, a butterfly plate 7a and a valve stem 1a connected to the transmission device. constitute. In use, the disc-shaped butterfly plate 7a is installed along the radial direction of the pipeline, and rotates around the valve stem 1a between 0° and 90° to realize full closing and full opening. As a fluid pipeline valve,...

AI Technical Summary

Problems solved by technology

As a fluid pipeline valve, the butterfly valve has strict requirements on its tightness. However, the current wafer butterfly valve still has the problem of running, emitting, dripping and leaking. The main reason is (see figure 1 ): Although the valve seat 4a of the existing wafer butterfly valve is nested inside the annular valve body 2a with an interference fit, there is still a leakage gap at the seam 9a. During engineering construction, the wafer butterfly valve is connected by The flange is connected to the pipeline. Due to the offset of the flange during the docking operation by the construction personnel, the joint 9a is exposed to the fluid, and the fluid flows into the valve body from the leakage gap at the joint and passes through the upper valve neck 3a. The center hole of the valve stem overflows, and the valve leaks, which affects normal use

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