Abstract: An apparatus for exposing the fibrous reinforcements of a fiber reinforced resin body comprises at least one stage in which a portion of the resin body is brought into contact with a heated resin removing liquid while the resin body is vibrated. According to this apparatus subsequent processing of the resin body, e.g., connecting to another similarly treated resin body, can be advantageously conducted by utilizing the exposed fibrous reinforcement.

Abstract: A pipe joint wherein an annular connecting resin body in contact and engagement with the outer periphery of one end of at least one pipe is used for connecting the end of the pipe to one end of another pipe. The joint comprises a device for reinforcing the bond between said one pipe and the connecting resin body in addition to sanding provided for the outer periphery of the end of said one pipe. The bond reinforcing device is a barbed wire, barbed tape, piano wire or the combination of engaging grooves and engaging projections, which prevents the axial displacement of said one pipe relative to the resin body to avoid cracking due to such displacement.

Abstract: A structure at a connection where at least two resin pipes are connected to each other end-to-end. The structure is characterized by annular resin body means provided on the inner periphery of the end of at least one of the resin pipes and having at least one end positioned in an annular recessed portion formed in the inner periphery of said one resin pipe. Since the above-mentioned end (which is more subject to the action of internal fluid than the other end) is positioned in the annular recessed portion, the resin body means is not eroded by the internal fluid.

Abstract: A butterfly valve comprises a substantially cylindrical casing (20) having an annular valve seat (A) on its inner peripheral surface, and a valve disk (44) disposed within the casing (20) and rotatable about an axis (35). The valve disk (44) is formed at an outer peripheral edge portion with an annular groove (52) in which an annular valve seal (51) is partially fitted. The valve seal (51) is adapted for pressing contact with the valve seat (A) at a predetermined pressure and anchored in the annular groove (52) by resin (58) pressure-injected into the annular groove (52) through a resin injection channel (53) in communication with the groove. Accordingly, the seal pressure of the valve seal (51) on the valve seat (A) can be set to the predetermined value at all times even if the dimensions of the valve seat (A) and the valve disk (44) and the position of the axis of rotation (35) involve errors.