Three eccentric metal hard sealed butterfly damper

Abstract

The invention provides a three-eccentric metal hard sealing butterfly valve, mainly comprising a driving part and a body; the body mainly comprises a valve body, a valve rod, a valve flap and a sealing structure; the valve seat sealing surface of the valve body is surfacing-welded by a Stellite alloy layer; a sealing ring matched with the valve seat sealing surface is prepared by a whole dual-phase stainless steel material; the valve seat sealing surface and the sealing ring on the valve flap form a sealing pair; the valve flap mainly consists of a valve flap body, a pressing plate and a sealing ring which are combined with each other; the pressing plate closely presses the sealing ring on the valve flap body; the sealing between the sealing ring and the valve flap body is realized by a spring accumulation typed sealing ring under the sealing ring; the valve flap body and the center of the valve body are provided with a valve rod; a guiding liner is arranged between the valve rod and the valve body; the valve flap can carry out rotary motion at 90 DEG in the valve body under the driving of the valve rod; the three-eccentric metal hard sealing butterfly valve has reasonable and compact structure, convenient and flexible usage, small operation moment of the valve, long service life, avoiding maintenance, wide applicable range, good reliability and the like.

Description

technical field [0001] The invention relates to a metal hard sealing structure of a triple eccentric butterfly valve, which belongs to the technical field of valves. Background technique [0002] In the prior art, the triple-eccentric hard-sealed butterfly valve uses a multi-layer soft and hard laminated structure for the sealing ring, which has the following disadvantages: 1. When the valve is in the open state, the medium forms a positive surface on the sealing surface. Scouring, the soft sealing tape in the metal sheet interlayer is easily damaged after being washed and directly affects the sealing performance; 2. Frequent opening and closing will cause the soft sealing part to be damaged first, the seal will fail, and the service life will not be long; 3. The soft sealing is easy to deform at ultra-low temperature. Therefore, the soft interlayer in the multi-layer soft and hard laminated sealing ring cannot be used in ultra-low temperature (-196°C) and high pressure (pre...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the triple-eccentric hard-sealed butterfly valve uses a multi-layer soft and hard laminated structure for the sealing ring, which has the following disadvantages: 1. When the valve is in the open state, the medium forms a positive surface on the sealing surface. Scouring, the soft sealing tape in the metal sheet interlayer is easily damaged after being washed and directly affects the sealing performance; 2. Freque

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