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Qingdao HuiFeng ShiYe Co., LTD.
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These objects and advantages are obtained by the gasket and butterfly valve constructions of the invention, the general nature of which may be stated as such as in valve construction, a butterfly valve body having an internal preferably grooved gasket-receiving cavity and valve stem openings connected to the cavity, a precision-molded rubber ringlike gasket having, when the body cavity is grooved, an external annular rib and preferably diametrically opposed collars forming stem holes for the stem of a valve disc, stated gasket being generally complementary to, but preferably slightly larger in external configuration than the grooved gasket-receiving cavity and stem openings within the valve body in which the gasket is received and bonded; the inside gasket surfaces surrounding the stem openings preferably becoming flat areas; the inside annular surface of the gasket being convexly curved in cross section and its diameter being slightly smaller than the outer diameter of the valve disc which rotates inside the valve body and gasket; the precision-molded gasket being adhesively bonded with adhesive-bonding material in the valve body gasket-receiving cavity whilst held under compression at elevated temperature for a time sufficient to form an efficient bond; and also the precision-molded gasket after being bonded to the valve body being under compression to obtain enhanced characteristics and properties.
A typical flanged butterfly valve body is indicated at 1 (FIG. 1) with the improved gasket liner of the invention usually indicated at two mounted therein. Valve body 1 consists of a cylindrical central portion 3 having flanged ends 4 and 5 along with a base 6. Body portion three is formed with an annular gasket receiving cavity 7 in which the gasket two is situated.
