Abstract: A unique relief valve is provided for use with a fluid system and comprises a reducing bushing having a throughbore. The bushing is externally threaded for connection with a standard fluid connector and, similarly, is internally threaded around its throughbore for connection to a further fluid connector in the fluid system. A valve seat having a fluid passageway is secured to the bushing while a valve member cooperates with the valve seat and is movable between open positions and a closed position. In its closed position, the valve member closes the fluid passageway on the valve seat and thus prevents fluid flow through the reducing bushing while, conversely, with the valve member in its open positions, fluid communication is established through the reducing bushing throughbore. A helical spring abuts against the valve member at one end and, at its other end, against a spring seat and urges the valve member towards its closed position.

Abstract: A novel relief valve is provided for connection with a fluid system. The relief valve includes an elongated housing having an inlet and an outlet with a fluid passage connecting the inlet to the outlet. Preferably, the housing is constructed of a number of conventional and readily available pipe fittings. A relief valve assembly is disposed within the fluid passageway and comprises a perforated tube with a valve seat positioned at one axial end of the tube and adjacent the housing inlet. A valve member is also disposed within the perforated tube and is urged against the valve seat by a helical spring to normally prevent fluid flow through the relief valve. A stop pin is disposed through substantially diametrically opposed apertures in the perforated tube at a position spaced from the valve seat which acts as a stop for the end of the helical spring opposite from the valve member.

Abstract: A fluid filtering device is provided for connection with a fluid line. The fluid device includes a housing having a fluid inlet on one end, a fluid outlet on the other end and a fluid passage formed through the housing. The fluid passage connects the inlet with the outlet and includes a port formed along its length. A tubular filter element open at one end is removably insertable into a filter chamber formed within the housing and, upon insertion, is axially slidable between a first position in which the open end of the filter element abuts against the fluid port and a second position in which the open end of the filter element is spaced from the fluid port. A spring urges the filter element toward its first position. In operation the fluid flow into the housing inlet passes through the port and into the interior of the filter element. The fluid then flows through the filter element and to the housing outlet.

Abstract: A fluid filtering device is provided for connection with a fluid line. The fluid device includes a housing having a fluid inlet on one end, a fluid outlet on the other end and a fluid passage for connecting the inlet to the outlet. The fluid passage includes an elongated cylindrical wall portion along its length. A filter assembly comprising a tubular filter element open at each end and a cap attached to a first axial end of the filter element is insertable within the housing so that the other or second end of the filter element is received within and sealingly engages the cylindrical wall portion of the fluid passage when the cap is connected to the housing. With the filter assembly thus positioned, the outer periphery or exterior of the tubular filter element is open to the housing inlet while, conversely, the interior of the filter element is open to the housing fluid outlet.

Abstract: A fluid filtering device is provided which is particularly suitable for connection with the return or pressure line of a hydraulic system. The fluid filtering device comprises an elongated tubular cylindrical housing open at each end and which has at least its lower end submerged in a fluid reservoir. An elongated filter assembly includes an extension tube and a tubular cylindrical filter element coaxially connected at one end to the extension tube. The filter assembly is axially insertable into the housing so that the filter element is positioned at least partially below the fluid level of the reservoir. Upon insertion, both axial ends of the filter element sealingly engage the interior walls of the housing while the filter element is spaced radially inwardly from the housing thus forming an annular inlet chamber. Fluid flows from the inlet and into the annular chamber, through the filter element and to the reservoir through the open lower end of the filter element.

Abstract: A fluid filtering device utilizing a standard or conventional tee connector and a standard or conventional pipe as the housing. A filter assembly is threadably received in one end of the tee connector and carries a filter element which extends into the pipe.