Abstract: A filter monitoring device for use in monitoring the purity of a fluid through a filter includes a pressure differential sensing device in communication with the filter. The filter monitoring device defines an inlet port which is in communication with the supply of fluid upstream of the filter and an outlet port which is in communication with a supply of fluid downstream of the filter. The differential pressure sensing device comprises at least one movable device which is in contact with both the upstream and downstream supplies of fluid and moves in response to changes in the pressure differential of the fluid. Different total differential pressures are accommodated by corresponding stiffness of a biasing device. The differential pressure sensing device also comprises a distance sensing device which continuously measures or detects the distance of travel of the movable device.

Abstract: The present invention relates to an apparatus for detecting operational anomalies in a pressurized fluid circuit having a main pump, a fluid filter and a booster pump connected in series. The apparatus has an indicating detector to provide an indication of a system malfunction and a switching device connected to the indicating detector, as well as to various points in the pressurized fluid circuit, to enable the indicating detector to detect a malfunction in either the booster pump or the filter. The switching device has pressurized fluid inlets connected to a point upstream of the booster pump, a point between the booster pump and the filter inlet and to a point between the filter outlet and the inlet of the main, high pressure pump.

Abstract: Two or more filters of different filtration particle size capabilities are arranged in a hydraulic circuit such that hydraulic oil containing contaminants is passed through the filters, either in series according to the order of the filtration particle size capability or in parallel. A sensor determines the pressure differential between the inlet and outlet of a respective filter, and a signal is provided to a contamination level indication device when the pressure differential between the inlet and outlet of a respective filter exceeds a predetermined level.

Abstract: A fluid filter clogging display comprising a case of non-magnetic material divided into an upper housing, at atmospheric pressure, and a lower housing by an impermeable membrane, a piston movable in the lower housing and dividing the lower housing into a high chamber and a low chamber, the high chamber communicating with an upstream side of a filter and the lower chamber communicating with a downstream side of the filter, a magnet mounted on the piston and disposed in the high chamber, a magnetizable detector in the upper housing for sensing a position of the magnet, a return spring located in said low chamber biasing the piston towards the impermeable membrane and a helical spring made of a shape memory alloy (SMA) which is stiff above a specific temperature and compliant below such a temperature and mounted such that the SMA spring joins the magnet to the piston depending upon the temperature thereof.

Abstract: A system for measured tightening of an oil filter to an engine block mount includes an array of clocks placed circumferential around oil filter (20). Each clock has one dark hand (26) and one light hand (28). The light hand is advanced of the dark hand. The degree of tightening is determined by amount of separation between hands. As filter is rotated, next clock coming into view, has hands positioned one hour advanced (4-13). Panoramic movement of hands as filter is turned will indicate degree of rotation and tightening.

Abstract: The temperature of the oil or the temperature of the cooling medium at the inlet side and at the outlet side of the oil cooler is measured and the two temperature values are compared to each other and, in the event the temperatures exceed or fall below the pre-set temperature difference, a warning signal is actuated.

Abstract: A cartridge style, pop up, differential pressure indicator includes a threaded body member, a cover structure and a cylindrical indicator button, which carries a magnet at its lower end, and is slidably supported in the cover for movement between a depressed, hidden position and an extended indicating position. The button is engaged at one side by a leaf spring which in the depressed position urges a lip on the button under a ledge in the cover to serve as a detent. A piston slidably supported in the body is subject to differential fluid pressures and carries a magnet at its upper end, poled in a manner to repel the magnet in the indicator button to urge the latter against the bias of the detent spring and upwardly to the extended, indicating position. A semicircular bimetal strip supported in the cover engages the detent spring at lower temperatures to prevent false release of the indicator button due to cold weather, high fluid viscosity situations.

Abstract: A method for sighting engine components in an engine compartment by first locating a desired perimeter label which is brightly colored and then to envision a straight line from that label to the respective engine component. The engine component will have detection means similar in color to the label to thereby provide immediate recognition. Certain hidden components may also be sighted with the use of two perimeter labels which have respective envisioned straight lines intersecting at the component's location.

Abstract: A temperature compensating differential pressure indicating device having a lock-out feature requiring internal reset after actuation. The differential pressure responsive indicating device includes a case having an internal chamber and a piston reciprocably and sealingly disposed in the internal chamber. A piston follower is also reciprocably disposed in the internal chamber and abuts against the piston. A first biasing element biases the piston and the piston follower in a first direction while a second biasing element biases these components in the opposite direction, the second biasing element being weaker than the first biasing element. The piston is displaceable in response to the pressure differential between an inlet pressure and an outlet pressure. A shape memory alloy temperature responsive abutment permits the piston follower to move together with the piston at or above a predetermined temperature, while preventing motion of the piston follower below the predetermined temperature.

Abstract: An excessive pressure differential indicating device for use with a filter in a liquid circulating system. The device has a reciprocable piston that reciprocates between a high pressure location, when the pressure differential is not excessive, and a low pressure location, when the pressure differential is excessive. The device has an indicator button with a magnetically conductive element, and the button is retained in a non-indicating position when the reciprocable piston is at the high pressure location by magnetic attraction between a permanent magnet carried by the reciprocable piston and the magnetically conductive element, a spring being provided to bias the indicator button to an indicating position when the reciprocable piston moves with the permanent magnet away from the indicator button to the low pressure location.

Abstract: A device for indicating differential pressures between first and second pressure sources comprising a housing with a bore and a piston member slidably disposed within the bore and dividing the bore into first and second chambers. The piston member includes a permanent magnet and the housing includes ducts for connecting the first pressure source to the first chamber and the second pressure source to the second chamber whereby the piston member is displaceably responsive to differences in pressure between the first and second pressure sources. The device further comprises indicators in cooperative arrangement with the piston member for indicating at least first and second predetermined differential pressure levels respectively corresponding to respective displacements of the piston member within the bore. The indicators are magnetically coupled to the piston permanent magnet such that they move from non-signalling to signalling positions in response to the respective displacements of the piston member.

Abstract: A fluid filter monitoring system includes a filter relief valve movable in response to a pressure buildup caused by filter clogging to sequentially actuate a pair of pressure-operated switches. A temperature sensor senses the temperature of fluid in the hydraulic system. A control unit, including a microprocessor, controls the energization of a plurality of indicators, depending upon the status of the temperature sensor, the pressure-operated switches and the duration of actuation of the switches.

Abstract: A versatile filter structure adaptable for use in differently ported configurations includes accommodation for variations of bypass and shutoff valving and for filter element replacement from either end or centrally of the structure. A head casting is secured to a tubular housing and either may be the mounting device for the filter. A funnel shaped diverter having an oblique edge is removably mounted in the head casting and provides separation between inlet and outlet portions of the filter structure by means of an eliptical o-ring seal at the edge which engages the interior of the head casting. The diverter provides a smooth transition for fluid flow to the interior of the filter, supports one end of the filter element in the tubular housing, optionally houses a shutoff valve operative automatically upon filter element removal, and further houses a bypass valve for safeguarding against filter element blockage.

Abstract: A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system, having a port that permits introduction or withdrawal of fluid for testing of operability under the predetermined pressure differential, and having a bimetallic element that prevents false actuation of the element at abnormal temperature, and a deactuator for the bimetallic element that permits such testing of the indicator via the port for operability even at such abnormal temperature.

Abstract: A differential pressure indicator includes an indicator element having a magnet affixed to the lower end thereof, the element being axially movable from a retracted non-indicating position to an extended indicating position. A spring-biased piston made of material which is not a permanent magnet but which is responsive to a magnetic field is axially movable in a fluid pressure chamber in response to changes in differential pressure. An increase in differential pressure causes the indicator element to move upwardly to a visual indicating position where its tip protrudes beyond the casing of the device.

Abstract: A differential pressure indicator for indicating the degree of contamination of a filter element, has a piston movable against a spring by increasing differential pressure and the piston is connected through a helical constraint to turn a magnetic element as the piston moves. An indicator element is located on the opposite side of a wall from the magnetic element and is magnetically coupled to it and is thereby turned by the first element as the latter turns.

Abstract: A differential pressure indicating device includes a piston responsive to the differential between inlet and outlet pressures. The piston is retained in a normal position by the force of spring means, and which spring means releases the piston at a predetermined excessive differential pressure condition, whereupon the piston actuates an indicating member for indicating the condition. The device is reset by manually re-engaging the piston and the spring means subsequent to correcting the condition.