Non-abrasion hard-sealing butterfly valve

Abstract

The invention relates to a non-loss hard seal butterfly valve which consists of a valve body, a valve rod, a butterfly plate and a valve seat. The invention is characterized in that the valve seat can be a movable valve seat which can axially move along the inner wall of the valve body; one side of the valve body is provided with a lateral body; seal rings are arranged both between the valve seat and the valve body, between the valve seat and the lateral body; a seal component is fixed on a butterfly plate frame; moving fit clearances are reserved between an inner side surface and an outer side surface of the valve seat, between the valve body and the lateral body; a spring is arranged between an outer end surface of the valve seat and the lateral body, an inner end surface of the valve seat is connected with the valve rod through a push rod; an inner end surface of the lateral body is provided with a spring; an upper end and a lower end of the valve rod are respectively provided with a curved slot; an upper curved slot and a lower curved slot are respectively formed by a skewed slot and an arc slot; the middle part of the valve rod is also provided with a long keyway, and an upper sliding key and a lower sliding key which are respectively fixed on an upper connecting seat and a lower connecting seat, and the upper connecting seat and the lower connecting seat are respectively fixed on the butterfly plate; the push rod consists of an upper push rod and a lower push rod, one end of the upper push rod and one end of the lower push rod are both provided with a roller, one end of the lower push rod is embedded in the lower curved slot and capable of sliding, while the other end of the lower push rod is hinged with the inner end surface of the movable valve seat; the upper push rod and the lower push rod are symmetrically arranged; a uni-eccentric structure is formed between a butterfly plate rotating axis and a seal pair plane.

Description

technical field [0001] The invention relates to a valve, in particular to a wear-free hard-sealed butterfly valve. The international patent classification number is intended to be Int.Cl.F16K1 / 22 (2006.01). Background technique [0002] Existing hard seal butterfly valves generally include a valve body, a valve stem, a butterfly plate and a valve seat. The inner circle of the valve seat and the outer circle of the seal form a sealing pair. When the valve is closed, relying on the radial compression of the butterfly plate and the thrust of the positive medium, the sealing ring is elastically deformed to achieve an interference fit seal. Due to structural reasons, when the butterfly valve is opened and closed, there is always friction between the sealing pairs, which increases the torque of the opening and closing valve and slows down the opening and closing speed. The inevitable frequent opening and closing will cause accelerated wear of the sealing surface and improve the s...

AI Technical Summary

Problems solved by technology

But this kind of butterfly valve still has the following disadvantages: 1. The structural accuracy related to the molten pool is actually very high, the processing is difficult, and the product cost is greatly increased; 2. The molten pool itself also needs to be sealed, and the sealing effect is difficult. Guarantee, affect or reduce its pressure charging and pressure relief performance, and the sealing problem of the butterfly valve has not been completely solved; 3. The valve drive cannot be driven by manual and electric at the same time, the applicable surface is narrow, and it is inconvenient to use

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