Abstract: This invention relates to an adaptor for connecting a non-metallic pipe to a threaded metallic element, such as a sprinkler head, in leak-tight fluid communication. The adapter comprises a plastic coupling unit which is adhesively secured at one end to plastic pipe and adapted at the other end thereof to receive a threaded metal insert which may be threadably connected to a metal element, such as a sprinkler head. The adapter of the invention is particularly suitable for use in high pressure fire extinguishing systems.

Abstract: An improved ball valve and method for assembling same having a main valve body with an axially extending throughbore for the passage of fluids therethrough. A ball having a throughbore is mounted in the valve body passageway and rotatable therein from a first position aligning the throughbore through the ball with the throughbore through the valve body permitting fluids to pass through the aligned throughbores, to a second position wherein the body of the ball seals off the throughbore through the valve body stopping passage of fluid therethrough. The ball is rotatable by a stem keyed to the ball having a shaft extending out of an opening in the valve body, the axis of the opening being normal to the axis of the throughbore through the valve body.

Abstract: A ball valve having an externally threaded seal carrier, a ball, a seal disposed between the carrier and ball, a tubular valve body internally threaded to engage the external threads of the seal carrier and hold it in the body, an axial clearance between the external and internal threads to permit linear movement of the carrier, a connecting sleeve which contacts the carrier, and a union nut adjustably attached to the valve body and slidably engaging the connecting sleeve for external adjustment of the axial position of the carrier within the body to compensate for seal wear by movement of the sleeve towards the body. The carrier extends beyond the valve body to provide an adjusting space between the connecting sleeve and body to permit movement of the sleeve towards the body.