Non-abrasion hard-sealing butterfly valve

Abstract

The invention relates to a wear-free hard-sealed butterfly valve, which includes a valve body, a valve rod, a butterfly plate and a valve seat, and is characterized in that the valve seat is a movable valve seat that can move axially along the inner wall of the valve body; one side of the valve body There is a side body; a sealing ring is installed between the valve seat, the valve body and the side body; the seal is fastened on the butterfly plate frame; there is a moving fit gap between the inner and outer sides of the valve seat and the valve body and the side body , there is a spring between the outer end surface of the valve seat and the side body, and the inner end surface is connected with the valve stem through a push rod; There is a long keyway in the middle of the valve stem, and there are upper and lower keys respectively fixed on the upper and lower connecting seats, and the upper and lower connecting seats are respectively fastened on the butterfly plate; the push rod It includes upper and lower push rods, one end of which is equipped with a roller, one end of the lower push rod is embedded in the lower curved groove, and can slide, and the other end is hinged with the inner end surface of the movable valve seat; the upper push rod and the lower push rod are installed symmetrically ; There is a single eccentric structure between the disc rotation axis and the sealing plane.

Description

Technical field [0001] The present invention relates to a valve, especially a wear-free hard-seal butterfly valve, the international patent classification number is proposed to be Int.Cl.F16K1 / 22 (2006.01). Background technique [0002] The existing hard seal butterfly valve usually includes 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 constitute a sealing pair. When the valve is closed, the sealing ring is elastically deformed by the radial compression of the butterfly plate and the thrust of the positive medium 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 opening and closing the valve and slows down the opening and closing speed. The inevitable frequent opening and closing will cause accelerated wear of the sealing surface and sealing performance....

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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