A kind of high air tightness fire butterfly valve

Abstract

The invention relates to the technical field of valves, in particular to a fire-fighting butterfly valve with high air tightness, comprising a valve body, a valve cover, a valve stem and a butterfly plate. The valve body is provided with an inlet and an outlet for medium circulation, and the top of the valve body is provided with Through hole, the bottom of the valve body is provided with a valve stem giving way hole, the bottom of the valve stem giving way hole is provided with a bottom cover, the lower end of the valve stem is inserted into the cavity through the through hole, and inserted into the valve stem giving way hole, and the butterfly plate is fixed On the valve stem, the valve body is provided with a valve seat that cooperates with the butterfly plate to form a seal, the upper end of the valve body is provided with a valve stem sleeve coaxially arranged with the through hole at the through hole, and a valve stem and the valve stem sleeve are provided with The first sliding bearing, between the valve stem and the valve stem sleeve, is provided with a sealing packing above the first sliding bearing, the bottom end of the valve cover is provided with a pressure ring, the lower end of the pressure ring abuts the upper end of the sealing packing, Passing through the top of the valve stem and fixing the cover on the upper end of the valve stem sleeve by bolts, at least one disc spring is sleeved at the position where the screw rod in the bolt is located between the valve cover and the valve stem sleeve.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a fire-fighting butterfly valve with high air tightness. Background technique [0002] Butterfly valve, also known as flap valve, is a kind of regulating valve with simple structure. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment. [0003] The sealing performance of the butterfly valve refers to the ability of each sealing part of the butterfly valve to prevent the leakage of the medium, which is the most important technical performance index of the butterfly valve. [0004] In the existing butterfly valve structure, the butterfly valve usually includes a valve body, a valve cover, a valve stem and a butterfly plate. The seal between the valve stem and the valve body is usually sealed with a sealing packing. When the valve stem a...

AI Technical Summary

Problems solved by technology

[0005] However, as the number of times of use increases, the number of extrusions between the sealing packing and the valve stem also increases. During the friction process, the impregnated lubricant in the sealing packing is frequently squeezed out, so that the appearance of the sealing packing is reduced and the As a result, the tightness is reduced, and it is easy to cause the seal packing to fail, resulting in the leakage of the conveying medium

Images