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two. Description of the Prior Art


ball valves usually have been made by casting a valve body Evander Kane Jersey Youth , then machining the casting to shape, then shipping the body to a rubber plant where a rubber seal gasket is molded and vulcanized in a cavity of the valve body, and then returning the valve body with the gasket vulcanized therein to the valve plant for final assembly, storage and distribution. Fantastic expense is involved for shipping costs of heavy valve bodies which may weigh hundreds of pounds; for rubber plant-vulcanizing and molded equipment; and for maintaining inventories of all sizes and kinds of valves.


Vulcanized rubber shrinks on curing and cooling after molding which locations the rubber seal or gasket component vulcanized in a recess in a metal valve body under tension. This tension can affect the bond between the rubber and metal in addition to the permanent set Tim Heed Jersey Womens , and also can impair the retained physical properties of the rubber. Also rubber under tension has reduced-abrasion resistance to supplies flowing via the valve.


Numerous types of rubber are needed for valves, depending upon the specific liquid to be handled by the valves, thus requiring an inventory to be maintained at the valve plant of all sizes and kinds of valves with all rubber-type gaskets so that valve orders may be filled quickly. This greatly multiplies the inventory investment needed.


These are a few of the age-old difficulties that have existed in the art for which a solution has been sought, with out success Melker Karlsson Jersey Womens , for many years.


SUMMARY OF THE INVENTION


Objectives of the invention consist of providing precision-molded rubber ball valve gaskets which might be bonded at a valve plant with an adhesive under pressure and at elevated temperature to and inside usually complementary cavities in valve bodies; providing precision-molded gaskets formed of numerous desired rubber kinds which may be shipped easily and inexpensively to and stocked at a valve plant for selective bonding by simple operations to valve bodies as orders might require, thereby reducing inventory costs; supplying precision-molded gaskets which have shrunk before bonding in valve bodies and carrying out simple bonding operations with the gaskets maintained under pressure so that the gasket rubber is under compression when bonded to the valve bodies, thus enhancing the retained physical properties, growing abrasion resistance Kevin Labanc Jersey Womens , maintaining an effective and effective bond, and providing most favorable permanent set characteristics, and supplying new gasket and ball valve constructions which have enhanced wear qualities, which have substantially decreased manufacturing expenses Tomas Hertl Jersey Womens , which eliminate age-old difficulties existing within the art and which solve existing issues, satisfy needs, and acquire new outcomes within the art.


These objects and benefits are obtained by the gasket and ball valve constructions of the invention, the general nature of which may be stated as including in valve construction Martin Jones Jersey Womens , a ball 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 Joe Pavelski Jersey Womens , stated gasket becoming generally complementary to, but preferably slightly larger in external configuration than the grooved gasket-receiving cavity and stem openings in the valve body in which the gasket is received and bonded; the inside gasket surfaces surrounding the stem openings preferably being 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 becoming adhesively bonded with adhesive-bonding material in the valve body gasket-receiving cavity while held under compression at elevated temperature for a time sufficient to form an effective bond; and also the precision-molded gasket after becoming bonded to the valve body being under compression to obtain enhanced characteristics and properties.

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