Abstract: This invention is directed to a seal for a needle valve stem in devices used to dispense a fluid. The seal comprises an O-ring in radial and annular compression about the outside cylindrical portion of a needle valve stem.

Abstract: The invention relates to an apparatus for dispensing solvent at a predetermined flow rate into a painting apparatus to push paint from the painting apparatus at the required flow rate to maintain the paint spray operation until the end of the paint spray cycle and prior to the start of a color change process.

Abstract: An apparatus for effecting rapid color change of the color component of a multiple component sprayable fluid to be applied using a manual spraygun. The apparatus includes primary and secondary color changer means, each having a manifold with a through passage. Color component to be applied to a substrate enters the primary color changer manifold and passes out of that manifold through a metering pump and flow sensor to the secondary manifold from which it passes through a color outlet line and ultimately to a spraygun. Apparatus is adapted to effect rapid flushing and color change by sequencing color inlet and outlet valves and flush and dump valves so as to effect rapid flush of the lines and connection of the subsequently filled color changers to color outlet lines.

Abstract: A fluid mixing apparatus for association with an air atomizing spray gun is disclosed. The fluid mixing apparatus comprises a fluid manifold adapted for attachment to the handle of an air atomizing spray gun and includes static mixer means interconnecting the fluid manifold with the spray fluid inlet of the air atomizing spray gun. The fluid manifold comprises a fluid passage means interconnecting a plurality of inlet ports and communicating with an exit port which is connected to the static mixture means. The individual components of a multiple component sprayable fluid are separately introduced into the manifold through individual ones of the manifold inlet passages and are flowed through the manifold passage to be intimately intermixed by the static mixer means prior to being introduced into the sprayable fluid inlet port of the air atomizing spray gun.