Abstract: A check valve has an internal gate having an adjustable retention force, such that in the event that if the differential pressure between the upstream and downstream pressure changes, the force required to allow flow through the valve may be adjusted without removal of the valve from the piping system.

Abstract: A plastic pipe union has an integral locking mechanism which is activated when nut member of the union is sufficiently tightened to the threads of an adjoining male nipple. The nut member and the tail piece of the plastic union each have matching engagement surfaces, where each engagement surface has a scalloped profile. Once sufficiently tightened, tactile feedback is provided to a personal manually tightening the nut member, indicating that the scalloped structures of the opposing engagement surfaces have interacted and reached a locked configuration.

Abstract: A plastic pipe union has an integral locking mechanism which is activated when nut member of the union is sufficiently tightened to the threads of an adjoining male nipple. The nut member and the tail piece of the plastic union each have matching engagement surfaces, where each engagement surface has a scalloped profile. Once sufficiently tightened, tactile feedback is provided to a personal manually tightening the nut member, indicating that the scalloped structures of the opposing engagement surfaces have interacted and reached a locked configuration.

Abstract: An axially actuated drain valve for pools and spas mountable in a wall thereof. It includes a tubular body and a coaxial plunger. The body opens into the spa or pool at an inner end. The plunger has a passage opening near the outer end of its passage. A cylindrical seal engages with a seal on the plunger for a substantial range of movement to keep the valve closed. Beyond that, the plunger passage is opened for flow from the body passage opening. The plunger may have threads on its outer end to be coupled to a hose fitting.

Abstract: A valve system for a bag and box combination employs a fitment having an inner mounting flange secured to the inner surface of a bag and with a projecting portion projecting out through a hole in the bag and into a passageway in the outer container. A valve plate is positioned within the bag and mounted to rotate with a shaft between an open position wherein the valve plate does not obstruct the flow passage through the fitment and is axial space from its cooperating seat form by the inner surface of the mounting flange and a closed position where the valve plate is pressed towards and cooperates with the inner face of the mounting flange in surrounding relationship to the flow passage to seal the flow passage.

Abstract: A valve system for a bag and box combination employs a fitment having an inner mounting flange secured to the inner surface of a bag and with a projecting portion projecting out through a hole in the bag and into a passageway in the outer container. A valve plate is positioned within the bag and mounted to rotate with a shaft between an open position wherein the valve plate does not obstruct the flow passage through the fitment and is axial space from its cooperating seat form by the inner surface of the mounting flange and a closed position where the valve plate is pressed towards and cooperates with the inner face of the mounting flange in surrounding relationship to the flow passage to seal the flow passage.

Abstract: A gate valve having a pair of aligned flow passages with a common central axis, with a pair of seat mounts and respective seats facing each other, and forming the walls of a groove with a bottom, their sealing planes tapering toward one another. A riser rises above these seats, with a cap. An actuator rod slides through the cap and mounts and moves an unperforated gate to control flow through the seats. A releasable latch can join the cap and the gate to hold it in its most open position until overcome. A deformable nub is carried by the gate to act as a drag when the gate is moved.