초록 ▼

A molded polyethylene valve body has a conduit portion and an annular portion extending upwardly from the conduit portion. A passageway extends through the conduit portion for the conveyance of fluid. A valve seat is formed in the conduit portion by a metal sleeve that is molded in the valve body to

A molded polyethylene valve body has a conduit portion and an annular portion extending upwardly from the conduit portion. A passageway extends through the conduit portion for the conveyance of fluid. A valve seat is formed in the conduit portion by a metal sleeve that is molded in the valve body to prevent separation of the sleeve from the valve body during sustained pressures. O-rings positioned in grooves around the metal sleeve are compressed by the plastic material during the molding process to effect a seal between the sleeve and the plastic valve body. An annular rubber sleeve insert is vulcanized onto the inner diameter portion of the metal sleeve. A plastic valve disc is centrally positioned in the conduit portion within the periphery of the rubber sleeve insert and is arranged to sealingly engage the rubber sleeve insert when the valve is moved to the closed position. A metal stem extends through the annular portion of the valve body and is connected to the valve disc. The upper end of the metal valve stem is molded into an actuator. The actuator is sealingly connected to the annular portion of the valve body so as to maintain the actuator on the valve body in the event that the pressure seal between the valve disc and the valve body is destroyed.

대표청구항 ▼

A valve assembly comprising, a valve body of plastic material, said valve body having a conduit portion and an annular portion extending upwardly from said conduit portion, a passageway extending through said conduit portion for the conveyance of fluid through said conduit, a valve seat positioned i

A valve assembly comprising, a valve body of plastic material, said valve body having a conduit portion and an annular portion extending upwardly from said conduit portion, a passageway extending through said conduit portion for the conveyance of fluid through said conduit, a valve seat positioned in said passageway and secured to said conduit portion surrounding said passageway, said valve seat including a metallic sleeve member, said metallic sleeve having an outer peripheral edge, a plurality of circumferential grooves extending around said metallic sleeve on said outer peripheral edge, a resilient, expandable annular seal member positioned in each of said grooves, said seal members being undersized with respect to said grooves so that said seal members are stretched when in position in said grooves to securely grip said metallic sleeve member and prevent displacement of said seal members from said grooves during molding of said valve body around said metallic sleeve, said valve body plastic material being molded in surrounding relation with said seal members to embed said seal members in said plastic material to form a fluid tight seal between said metallic sleeve member and said valve body conduit portion, an annular resilient sleeve insert secured to said metallic sleeve member and positioned within said passageway, a valve disc centrally positioned in said conduit portion for movement into and out of sealing engagement with said annular resilient sleeve insert to effect closing and opening of said valve assembly, actuating means supported by said valve body annular portion and connected to said valve disc for moving said valve disc between an open position permitting fluid flow through said passageway and a closed position sealingly engaging said valve disc with said annular resilient sleeve insert to interrupt fluid flow through said passageway, a metal support sleeve positioned in surrounding relation with said valve body annular portion to reinforce said valve body annular portion, interlocking means on said metal support sleeve and said valve body annular portion for nonrotatably connecting said metal support sleeve to said valve body annular portion, said valve body annular portion having at least one vertical planar surface, and said metal support sleeve having a tab embedded in said plastic material of said valve body annular portion and abutting said vertical planar surface to permit the rotational forces generated upon turning of said actuating means to be transmitted from said valve body annular portion to said metal support sleeve.