Abstract: A lever system cover for sealing a vessel. The cover has a lever system thereon and the cover is fittable to the vessel. Receiving members are mounted to the vessel. A rotatable lever locating plate is attached to the cover having multiple lever bars attached. The lever locating plate is rotated moving multiple lever bars into engagement with receiving members on the vessel and the lever bars thus providing leverage to the cover to seal the cover to the vessel.

Abstract: A filter device including means to produce an air actuated purge for backwashing a filter assembly including a double sieve basket having a flexible filter between the double baskets. The backwash removes caked contaminant from the filter and baskets. The purge uses only the quantity of liquid in the housing and a blast of air to backwash the filter. The pressurized air causes roiling of the liquid and accelerates the blowing through the sieve baskets and flexible filter for the backwash to remove and loosen the contaminants. The air which follows the liquid through the filter assembly further loosens and then removes the remainder of the contaminants.

Abstract: A vibrating sieving unit for insertion into a housing to form a sieving filter. The vibrator directly vibrates the sieving cylinder reducing the buildup of filter cake for improved performance. A unique cleaning-in-place system is presented utilizing the fluid being filtered as the purging liquid. An alternate purge construction is also provided for use if the first purge route is blocked.

Abstract: A vibrating sieving unit for insertion into a housing to form a sieving filter. An air pressure operated vibrator directly vibrates the sieving cylinder to reduce the buildup of filter cake for improved performance. Tuning bars connected between the cover and the vibrator are structurally matched to the fluid being filtered and to the particular vibrating assembly to create a harmonic vibration and to thereby achieve a consistent, maximum vibration at a given, readily maintainable air pressure.

Abstract: A vibrating sieving unit for insertion into a housing to form a sieving filter. The sieving unit can be inserted into an installed casing of a filter unit by the use of a manifold plate. The vibrator directly vibrates the sieving cylinder reducing the buildup of filter cake for improved performance. A unique cleaning-in-place system is presented utilizing the fluid being filtered as the purging liquid.

Abstract: A fluid filtering device employs a removably insertable filter element which must be positioned within the device in order to avoid an indicator signal thereby alerting the user to inadvertant use of the filtering device without the filter element. The device generally includes a filter housing and rotatably securable filter head having inlet, outlet and bypass fluid passageways. The filtering structure includes a tubular filter element attached to a concave plate having the seal secured to the outer rim thereof. The concave plate includes a central opening which allows fluid communication between one fluid passageway and the inner chamber of the filter element and a plurality of peripherally disposed openings which permit fluid communication between the other fluid passageway and the outer housing chamber.

Abstract: The present invention provides a differential pressure monitor having an elongated housing defining an elongated interior chamber. A piston is axially slidably mounted within the chamber and divides the chamber into two subchambers, each of which are fluidly connected to a fluid system. A compression spring resiliently urges the piston in one axial direction in the chamber while an arm abuts against the piston and provides an exteriorly visible signal of the position of the piston within the chamber and thus of the differential pressure between the subchambers.

Abstract: A fluid filtering device comprising a housing having an open top and defining an interior chamber while an inlet and an outlet on the housing are open to the chamber. A filter bag is removably insertable into the chamber through the open top of the housing and to a filtering position in which the filter element is positioned in between the inlet and the outlet. A rim around the outer periphery of the filter bag engages an inwardly extending flange formed on the housing to secure the filter bag to the housing. A cover is movable with respect to the housing between an open and a closed position so that in its closed position, the cover closes the open top of the housing. A tubular element is secured to the cover which engages the filter bag and pushes the filter bag away from the open top of the housing and to its filtering position as the cover is moved to its closed position.

Abstract: A valve assembly is disclosed which comprises a housing having at least two fluid ports which are adapted for connection to a fluid system. A piston is slidably mounted in the housing and movable between a first position in which the fluid ports are fluidly connected and a second position in which the fluid ports are fluidly disconnected. A seal is carried by the piston and engages a sealing surface in the housing when the piston is in its second position. A scraping member is also carried by the member so that the scraping member passes across and engages the sealing surface as the piston is moved from its first and to its second position thereby cleaning the seal surface. Preferably an eccentric cam is employed for moving the piston between its first and second positions.

Abstract: A fluid filtering device comprising a housing having an open top and defining an interior chamber while an inlet and an outlet on the housing are open to the chamber. A filter bag is removably insertable into the chamber through the open top of the housing and to a filtering position in which the filter element is positioned in between the inlet and the outlet. A rim around the outer periphery of the filter bag engages an inwardly extending flange formed on the housing to secure the filter bag to the housing. A cover is movable with respect the housing between an open and a closed position so that in its closed position, the cover closes the open top of the housing. A tubular element is secured to the cover which engages the filter bag and pushes the filter bag away from the open top of the housing and to its filtering position as the cover is moved to its closed position.

Abstract: A back pressure inducer and check valve is disclosed for use with a fluid system having inlet passageway, an outlet passageway and in which fluid flows from the inlet and to the outlet passageway. The back pressure inducer comprises a valve seat secured to the system and having a fluid port fluidly between the inlet and outlet passageways. A valve member is movable between a closed and open position to variably open the fluid port while a spring urges the valve member towards its closed position. Cooperating conical surfaces on the valve member and valve seat form an annular passageway when the valve member is in its open position to produce controlled pressure drops between the inlet and outlet conduit over a wide range of fluid flow rates.

Abstract: A fluid flow meter is provided for indicating the fluid flow rate in two or more predetermined flow ranges. The flow meter comprises a housing having an inlet open to a cylindrical inlet chamber and an outlet open to a cylindrical outlet chamber. At least two cross passages in the housing interconnect the inlet and outlet chambers at axially spaced positions. A piston is slidably mounted within the inlet chamber and sequentially opens the cross passages to the inlet chamber in dependence upon the fluid flow rate into the housing inlet. The position of the piston is visible exteriorly of the housing and its position within the inlet chamber provides a visual signal of the fluid flow rate through the flow meter. The piston can be spherical, cylindrical, etc. in shape.

Abstract: A fluid filtering device comprising a housing having an interior chamber with an open top and an inlet and outlet open to the chamber. An annular seat is secured to the housing within the chamber in a position spaced downwardly from the open top so that the seat protrudes inwardly into the chamber and forms an axially extending surface having a seal member. A filter element is removably insertable into the chamber through its open top and to a filtering position in which the filter element is positioned in between the housing inlet and outlet. The filter element includes an outwardly flanged portion which abuts against the top of the seat when the filter element is in its filtering position while the seal member sealingly engages an axially extending surface of the filter element. A cover is detachably secured across the open top of a housing while an elongated handle is secured at one end to the filter element and its other end is positioned adjacent the intersection of the cover with the housing.

Abstract: A fluid filtering device is provided for use with a fluid reservoir. The filtering device comprises a housing having an elongated tubular and cylindrical part defining an interior chamber. A fluid port is formed at one end of the housing and the port is open to the chamber. The housing is secured within the reservoir so that the housing is submerged below the reservoir fluid level. A fluid passageway is formed through the housing to establish fluid communication between the fluid in the reservoir and the housing chamber. An elongated guide member is also secured to the upper end of the tubular housing part so that the guide member extends upwardly from the housing. A filter assembly comprising a tubular filter element and a coaxial elongated extension is manually insertable over both the guide member and the tubular housing part whereupon the filter element is fluidly positioned between the housing chamber and the fluid in the reservoir.

Abstract: A fluid filtering device is provided for use with a fluid system having a fluid reservoir at least partially filled with fluid. The filter device comprises a housing which is submerged within the reservoir and has a fluid port. An elongated filter assembly comprising a tubular filter element open at one end and a holder assembly secured to the other end of the filter element is insertable into the reservoir so that the open end of the filter element sealingly engages the submerged housing. A fluid passage through the housing fluidly connects the fluid port with the interior of the filter element. A stopper is formed on the free end of the holder assembly so that the entire filter assembly can be inverted and reinserted into the reservoir whereupon the stopper prevents fluid flow through the fluid passage permitting the servicing of other system downstream of the filter assembly without it being necessary to drain the reservoir.

Abstract: A fluid filtering device comprising a housing having an axis and defining an interior chamber. In one preferred embodiment a fluid inlet port is formed at one end of the housing which is open to the chamber while a fluid outlet port is formed on one side and is also open to the chamber. A filter element is positioned within the chamber between the inlet port and the outlet port. A first air bleed conduit within the housing has one end positioned within the outlet port and its other end positioned at the upper portion of the chamber when the housing is substantially vertically oriented. A second air bleed conduit within the housing also has one end within the outlet port and three openings at its other end. One of these three openings is at the uppermost portion of the chamber when the housing is in a corresponding one of three substantially horizontal positions.

Abstract: A fluid filtering device is provided which is particularly suitable for connection with the suction line of a hydraulic pump. 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 reservoir of the fluid to be filtered. An elongated filter assembly includes an extension tube and tubular cylindrical filter element detachably 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 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 and thus forming an annular outlet chamber. Fluid flows from the bottom housing, through the filter element, to the annular chamber and out through a fluid connector open to the annular chamber.

Abstract: A fluid flow meter is provided and comprises a tubular and cylindrical housing constructed of a transparent material and having an upper axial end, a lower axial end and defining an interior fluid chamber therebetween. A fluid inlet is fluidly connected to the lower end of the chamber while a fluid outlet is fluidly connected to the upper end of the chamber. At least one and preferably several flow responsive members are disposed and freely moveable within the interior of the fluid chamber. The members have a density greater than the density of the fluid flowing through the flow meter but are vertically displaceable within the interior chamber in an amount proportional to the fluid flow rate through the flow meter. The density and surface area of the members can be varied as desired in order to provide for different flow rates and flow ranges.

Abstract: A head assembly for a spin-off filter is provided and comprises a stamped housing having a closed top wall and an open bottom with a flange adapted to sealingly engage the spin-off filter. A tube extends through the housing and is secured to the housing by appropriate means, such as welding. A member is thereafter secured to the tube for detachable connection with the spin-off filter. The tube also includes fluid passage means formed therein so that one end of the tube forms a fluid outlet while the other end of the tube forms a fluid inlet for connection with a fluid system. Fluid flow into the fluid inlet is diverted by the fluid passage means through the spin-off filter and to the fluid 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 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.