Abstract: A pressure relief valve in a cap, and more particularly a pressure relief valve in a cap for use with pressure vessels in chromatography systems. In one exemplary application the valve is contained within the cap of a pressure chromatography column. In a second exemplary application the valve is contained within the cap of a mobile phase reservoir of a high performance liquid chromatography system. The valve generally comprises a body, a sealing element, and a force applying means. The body of the valve is formed into the cap and defines an inlet in communication with the interior of the column, an outlet in communication with ambient air, a first bore, and a seat. The sealing element slides within the body and is urged into sealing contact with the seat by the force applying means. The sealing element has a raised lip at its sealing face to provide a substantial sealing force per unit of sealing surface area.

Abstract: An ink filter system including a self-washing filter provided with upper and lower cylinder chambers and a piston reciprocable between upper and lower positions in the upper cylinder chamber. First and second inlets are provided for introducing fluid into the upper cylinder chamber on opposite sides of the piston. The filter screen is mounted in the lower cylinder chamber. The filter is cleaned on the upstroke of a spray nozzle which is connected to the piston. The spray nozzle is cleaned on the downstroke of the piston.

Abstract: In an article elevating apparatus, articles such as cigarette cartons, are picked up at a loading station by inclined roller carriers moving in an upward vertical direction. During upward movement the articles are held on the roller carriers by sliding engagement of the downward end of the articles against a vertical rail. The articles roll off of the carriers at a discharge station defined by the upper end of the rail.

Abstract: A card conveyor is disclosed as including a frame with a horizontal top surface supporting two spaced rows of conveyor rollers adapted to engage opposed edges of a card. An endless belt passes along a line tangent to the periphery of each conveyor roller in a row, the belt being pressed against each conveyor roller at its respective point of tangency therewith by a pressure roller which is biased toward the respective conveyor roller, enabling the belt frictionally to drive the conveyor rollers.