Butterfly valve with pressurized O-ring sale

Abstract

A butterfly valve for use with corrosive fluids is constructed of fiberglass-reinforced plastic (FRP). The valve blade is mounted in the valve body on a shaft comprising a continuous strand fiberglass-reinforced plastic rod secured in a sleeve. Exposed end portions of the rod are coated with plastic resin and machined for journaling in the valve body. An FRP sealing layer coats the sleeve and adjacent portion. A pressurizeable O-ring seal surrounds the passageway of the valve body for sealing against the periphery of the blade. The periphery of the blade is rounded and sized so that the O-ring cups the periphery of the blade when closed. The valve body is formed in two tubular sections which are connected together during assembly of the valve. The end faces of the two sections are oppositely beveled to jointly form an inverted V-shaped channel for the O-ring seal. The beveled end faces provide acutely angled edges tangentially contacting the sides of the O-ring along the inner surface of the valve body. During assembly, the O-ring is positioned between the beveled faces and fiberglass-reinforced plastic putty is laid in the channel along the exterior lateral sides of the O-ring to form wedges to retain the O-ring in position. An exterior overlay of fiberglass-reinforced plastic is then applied across the channel to connect the two sections together to form a unitary valve body.

Dependencies are inferred from the claim text.