Abstract: An automobile air intake system that has a detachable transparent window assembly for visually inspecting the air filter is contemplated. A user may inspect the air filter by viewing the air filter through the transparent window assembly. Alternatively, the user may remove the window assembly from the air intake system to provide an unobstructed view of the filter. The window assembly may be releasably secured to an airbox with magnets and magnetic materials. The airbox and window assembly may be contoured about the air filter, to provide a larger section of the filter to be viewed and inspected.

Abstract: A vacuum cleaner includes an improved dual-action filter cleaning mechanism using both a rotational flicking action and a vertical shaking action. A debris removal assembly of the vacuum cleaner can include a filter assembly having a first filter and a second filter arranged in a nested configuration, and a filter cleaning mechanism configured to impart a combination of vertical shaking of the first filter and rotational flicking of the second filter. The filter cleaning mechanism can include a camming mechanism configured to simultaneously move the first filter along the axis and rotate the first filter about the axis while the second filter remains stationary.

Abstract: A vehicle display device includes a digital display configured to display together a first integer value representing travel speed in kilometers per unit time and a second integer value representing travel speed in miles per unit time, and a controller configured to perform, at a time the second integer value is zero and the first integer value is positive, one of a correction to set the first integer value to zero and a correction to set the second integer value to a positive value, and display the first integer value and the second integer value on the digital display.

Abstract: An agricultural tillage implement is provided with a soil finishing system that includes a multi-bar harrow and a down pressure-controlled finishing tool that are arranged with respect to each other to enhance soil tilth and leveling, including reducing residual shank grooves in tilled soil, to improve seed bed preparation.

Abstract: Driver braking performance feedback may be conveyed to a vehicle operator as a braking efficiency score using a vehicle display system. The display system may include a vehicle display for displaying a braking efficiency indicator or gauge corresponding to the braking efficiency score. The braking efficiency score may be based on a comparison of the total regenerative braking energy recaptured during at least one braking event to a either a maximum amount of braking energy that may be recaptured during the at least one braking event or an actual total braking energy expended during the at least one braking event. The braking efficiency score may be displayed upon the completion of a braking event or upon a completion of a trip including a plurality of braking events. The display may also convey a distance corresponding to a portion of a trip distance achieved through regenerative braking.

Abstract: A surge relief valve includes a piston housing and a piston located within the housing for reciprocal motion. The surge relief valve also includes a position sensor to resolve the axial position of the piston relative to the piston housing. The position sensor includes a sensor body coupled to the piston housing and a movable element configured to move linearly relative to the sensor body and configured to move axially with the piston. At a least portion of the sensor body is located within the piston housing.

Abstract: A diaphragm pressure gauge includes a base, an inner cover, a diaphragm, a movement assembly, a pointer assembly, a dial plate, and an outer cover. The movement assembly is disposed within the inner cover. The diaphragm is disposed at a bottom end of the inner cover. The pointer assembly is disposed above the inner cover and connected with the movement assembly. A pressing worm shaft connected to the movement assembly is disposed at a central portion of the diaphragm. The base includes a connecting portion defining therein a pressure chamber in which a piston is disposed. The base defines a piston hole for engaging with the piston. One end of the piston extends through the piston hole and presses against the pressing worm shaft. The diaphragm pressure gauge can effectively prevent corrosion and damage of components inside the pressure gauge and detect a pressure as high as 1000 kg/cm2.

Abstract: A regulator unit which includes a regulator main body, and a pressure-regulating mechanism part, being installed consecutively thereto; the pressure-regulating mechanism part being constituted by a cylindrical housing provided with a shouldered hole, the shouldered hole being formed by a smaller-diameter bore and a larger-diameter bore, the smaller-diameter bore accommodating an adjusting spring and an end cover; a ball screw being disposed in the larger-diameter bore; an operation handle being mounted to a basal end part of a threaded rod of the ball screw through a fastener; and the operation handle being capable of being turned for expanding or contracting said adjusting spring to thereby change the spring pressure applied to a diaphragm receiving plate.

Abstract: A pressure gauge includes a base including an annular flange and a pipe for gas flow; a ring on the flange; an uneven pressure measuring member on the ring; a moveable assembly including a seat, a hollow insert, and a shaft wherein the seat is secured to the pressure measuring member, the insert includes two opposite, internal, upper projections, the insert is fastened in the seat, the shaft includes external threads secured to the projections, an upper annular groove, a top protrusion, and an axis projects upward from the protrusion; a pointer secured to the axis; a covering member includes a ring member on the pressure measuring member, and a bridge crossing the ring member and allowing the axis to pass through, and a bent member; a balance spring in the groove and fastened in the bent member; a scale on the bridge; a housing; and a transparent cover.

Abstract: A pressure gauge includes a base including an annular flange and a pipe for gas flow; a ring on the flange; an uneven pressure measuring member on the ring; a moveable assembly including a seat, a hollow insert, and a shaft wherein the seat is secured to the pressure measuring member, the insert includes two opposite, internal, upper projections, the insert is fastened in the seat, the shaft includes external threads secured to the projections, an upper annular groove, a top protrusion, and an axis projects upward from the protrusion; a pointer secured to the axis; a covering member includes a ring member on the pressure measuring member, and a bridge crossing the ring member and allowing the axis to pass through, and a bent member; a balance spring in the groove and fastened in the bent member; a scale on the bridge; a housing; and a transparent cover.

Abstract: A pointer-type alarm mark structure of a micro-differential pressure gauge includes a transparent casing. The transparent casing has a shaft thereon. At least one alarm index is provided on the shaft. By adjusting the alarm index to a desired position, the user can know whether the pointer of the gauge is within a safe area.

Abstract: A closure element is provided for a fuel tank of a motor vehicle, in which tank an at least slight excess pressure and/or vacuum may exist. An indication is provided on the closure element, by which indication the operator is informed of the presence of excess pressure and/or vacuum in the tank. The indication takes place mechanically by way of a mechanical pressure sensor, specifically with respect to the presence of essentially ambient pressure or excess pressure by use of different colors. For this purpose, an indicating dial can be provided in the closure element, which indicating dial can be rotated by way of a pin displaceable against a spring force under the influence of the pressure existing in the tank. A jacket segment being recognizable by the operator through a window.

Abstract: A pressure gauge includes a gauge base rotably disposed on a rotating shaft and a sectored gear disk of the gauge base, an indicating needle coupled to an end of the rotating shaft, and a reed pipe coupled to a pressure source, and the rotating shaft has an engaging portion engaged with the sectored gear disk for a transmission, and the pressure gauge is characterized in that the reed pipe has a lever installed at a movable end of the reed pipe, and the sectored gear disk has a latch hole for latching the corresponding lever, and when an end of the reed pipe is moved by a change of pressure, the lever is linked to the latch hole to rotate the sectored gear disk, so as to drive and turn the indicating needle linked with the rotating shaft.

Abstract: An on-vehicle display apparatus with an increased flat display size. The on-vehicle display apparatus includes a flat display capable of displaying various types of information, a light-transmitting substrate provided on a front-face side of the flat display, a pointer provided in the light-transmitting substrate, and a pointer drive means provided on a back-face side of the flat display. The pointer drive means rotates the pointer. The apparatus further includes a movement mechanism for moving the light-transmitting substrate to the outside of a display range. A first magnet is provided for the pointer, and a second magnet is provided for the pointer drive means and is configured to be opposite to first magnet.

Abstract: A pressure gauge device includes a display face, a pressure sensing mechanism capable of outputting the pressure level within a fluid flow device to the display face, an exhaust valve positioned on the display face and an input positioned on the display face, the input capable of controlling a fluid flow source, such as a compressor, to activate the fluid flow source. The exhaust valve and the input may be integrated into the display face by including a valve cutout and an input cutout in the display face. At least a portion of the exhaust valve may extend through the valve cutout, and at least a portion of the input may extend through the input cutout.

Abstract: A time remaining display assembly for indicating the time remaining in a pressurized gas tank, adapted to be connected to a regulator having a flow rate adjuster for selecting one of a plurality of flow rate settings comprising an assembly coupled to the flow rate adjuster, the assembly having one or more time scales imprinted thereon, each time scale corresponding to one of the flow rate settings, each time scale indicating the time remaining in the tank as a function of gas pressure in the tank.

Abstract: A pressure gauge 10 has an indicator needle 23 and a scale plate 22. A preset pressure indicating member 31 extending along a pressure scale in a circular arc pattern is slidably attached to a front wall 11 of a case 13, and provided with a first display section 35. An opaque shield portion 36 provided with a second display section 37 at one end thereof is provided to a transparent cover 26 rotatably attached to the front wall. The transparent cover 26 drives the preset pressure indicating member 31 to set a preset pressure range between the first display section 35 and the second display section 37 which is observable from the outside through the transparent cover 26. Therefore, it is easy to change a preset pressure range which is within a measurable range of the pressure gauge.

Abstract: An alarm mark structure of a micro-differential pressure gauge includes a transparent casing. The transparent casing has at least one recess thereon. The recess is located corresponding to the range of movement of a pointer or a scale plate. At least one mark member is provided on the transparent casing. The mark member has an engaging portion. The engaging portion is inserted in the recess, such that the mark member is coupled on the transparent casing. The user can place the mark member on the recess corresponding to the numerical value on the scale plate as desired to know whether the pointer is located within a safe area.

Abstract: A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or more sensors and uses the sensor data to calculate a figure of merit related to the efficiency of the system. In one embodiment, the sensors include one or more of the following sensors: a suction line temperature sensor, a suction line pressure sensor, a suction line flow sensor, a hot gas line temperature sensor, a hot gas line pressure sensor, a hot gas line flow sensor, a liquid line temperature sensor, a liquid line pressure sensor, a liquid line flow sensor. In one embodiment, the sensors include one or more of an evaporator air temperature input sensor, an evaporator air temperature output sensor, an evaporator air flow sensor, an evaporator air humidity sensor, and a differential pressure sensor.

Abstract: A filtration system for a gas powered concrete saw allows the user to inspect and/or determine how much dust is accumulated in the filter. In addition, manual filter cleaners are provided to allow the user to easily clean the filter without needing to open up the tool. In addition, the system is provided to deactivate the tool or notify the user if no filter is being utilized, or the filter is damaged. The system can also provide system lock out in the case of a missing or damaged filter. In addition, automatic methods are also provided to allow cleaning of the filter.

Abstract: A filter assembly for use with compressor assemblies such as oxygen concentrators, ventilators and other breathing apparatus including a compartmented housing member having at least one inlet opening, an outlet opening, a filter member, and an adjustment member associated with the at least one outlet opening for varying the size of the at least one outlet opening for adjusting the amount of ambient air entering the filter assembly.

Abstract: A gauge for measuring the magnitude of a measurable quantity, such as fluid pressure. The gauge includes a rotatable axle or shaft intended to rotate in response to different magnitudes of the quantity being measured and includes a dial possessing indicia corresponding to different magnitudes of such quantity. The improvement in the gauge relates to a very light-weight pointer having a needle section and a counterbalance section, in which the needle section is formed of a relatively light mass material, preferably balsa wood. The counterbalance section may be fashioned of a different, denser material. The surface of the counterbalance section may be provided with a series of parallel depressions that aid in cutting or trimming the counterbalance section to achieve a balance of the pointer about the axle or shaft. A method of making such a pointer is also disclosed.

Abstract: A bypass factor of an evaporator is used to indicate when an air filter of an HVAC is clogged. The bypass factor represents the amount of air that is bypassed without direct contact with the evaporator. As the air filter clogs, the bypass factor decreases. The bypass factor can also be used for early detection of clogging of the air filter. A first bypass factor is calculated by using the temperature measurements, and a second bypass factor is calculated by using the airflow rate of the air. The difference between the two bypass factors determines the error. An increase in the error indicates that the air filter is clogged. A coefficient of performance of the evaporator can also be calculated to detect if the air filter is clogged. A decrease in the coefficient of performance indicates that the air filter is clogged.

Abstract: An air supply system for a clean room with a critical machine. An intake duct connects the exterior of the clean room to a make-up air unit, and is configured to transport external air into the make-up air unit. A first air duct connects the make-up air unit to an air conditioning cabinet including a first chemical filter, and is configured to transport the air flowing through the make-up air unit into the air conditioning cabinet. The first chemical filter removes airborne molecular contamination from the air transported into the air conditioning cabinet. A second air duct connects the air conditioning cabinet to the critical machine, and is configured to transport the air flowing through the first chemical filter of the air conditioning cabinet into the critical machine. An exhaust duct connects the critical machine to the exterior of the clean room, discharging waste gas produced in the critical machine.

Abstract: A gauge for indicating a measured variable such as pressure. The gauge includes a motion detection device including a drive magnet that is adapted to be moveable in response to changes in the variable. The pointer rotation device includes a pivot member, a power magnet coupled to the pivot member, and one or more director members located adjacent the power magnet. Each director member includes a generally helical flange. A pointer is coupled to the pointer rotation device. The director members and the power magnet form a magnetic field adapted to magnetically couple the pointer rotation device to the drive magnet. The pointer rotation device is adapted to rotate about a rotational axis. Movement of the drive magnet in response to changes in the variable rotates the pointer rotation device and the pointer about the rotational axis such that the pointer indicates the measured variable.

Abstract: A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or more sensors and uses the sensor data to calculate a figure of merit related to the efficiency of the system. In one embodiment, the sensors include one or more of the following sensors: a suction line temperature sensor, a suction line pressure sensor, a suction line flow sensor, a hot gas line temperature sensor, a hot gas line pressure sensor, a hot gas line flow sensor, a liquid line temperature sensor, a liquid line pressure sensor, a liquid line flow sensor. In one embodiment, the sensors include one or more of an evaporator air temperature input sensor, an evaporator air temperature output sensor, an evaporator air flow sensor, an evaporator air humidity sensor, and a differential pressure sensor.

Abstract: A disc or like article (10, 115, 119) rotatable by drive means, such as a compact disc for use with a computer, includes indication means (12, 110, 120) which, when the disc is rotated at or above a predetermined angular velocity, provide an indication that rotation has occurred, which indication can be important if the disc contains confidential information. The indication device can be a tube formed with two enclosures separated by a breakable membrane (15, 16, 112, 122), a colored liquid/gel (17, 111 121) being in one enclosure and passing into the second enclosure, by breaking the membrane, when the disc is spun, thereby providing a visual indication thereafter of the spinning having occurred The invention also relates to such an indication means, per se, for after-fitting to a disc recorded on by spinning, and to a method of producing a disc with said indication means.

Abstract: A method for measuring multiple pressures by a single gauge (6) for simultaneously measuring separate pressures by respective pressure sensing elements (7, 8); and simultaneously indicating measurements of the separate pressures by respective pointers (11, 12) along a single gradient scale (14).

Abstract: An air filter sensor kit and method of using the same for permitting a person to modify the filtering portion of a heating or cooling system that uses an air filter to enable the determination of when the air filter is dirty and needs changing. The air filter sensor kit includes an air filter sensor with a portion shaped for insertion through the air filter and a portion with an indicator for indicating the condition of the air filter. The kit includes an air filter sensor connecting and support member for connecting the air filter sensor to an air filter grill and for supporting the air filter sensor and a cutting tool for cutting a hole in an air filter grill to allow the passage of a portion of the air filter sensor connecting and support member to permit a portion of the air filter sensor to be inserted through the air filter. The air filter sensor kit also includes a cutting tool guide that is adjustable to conform to various configurations of air filter grills.

Abstract: An air filter capable of visual indication of a clogged condition thereof includes a housing, a filter unit, a fan unit and a signaling device. The housing has an air inlet, an air outlet, and an air passage extending from the air inlet to the air outlet. The signaling device includes a flap disposed to span the air passage, a horizontal pivot pin connected securely to the flap and pivotable relative to the housing, and a pointer connected to one end of the pivot pin and rotatable with the pivot pin relative to the housing. A reduction in air flow through the air passage attributed to a clogged condition of the air filter causes the flap to pivot and move the pointer relative to the housing so as to indicate the clogged condition of the air filter.

Abstract: An air filter cleanness gauge is provided. The gauge in a preferred embodiment includes a transparent cover. The housing has a first opening for fluid communication with the atmosphere and a second opening having fluid communication with a fluid source exposed to a filter. A vane is pivotally connected within the housing and provides a pressure boundary between the first and second openings. Movement of the vane indicates a change in pressure differential between the atmosphere and the fluid source, thereby indicating a need to change the air filter.

Abstract: An improved new wheel (10) is disclosed which has an integral air pressure gauge (24, 100, 200). A passage (34) extends from the rim surface (22) exposed to the tire interior directly to the tire gauge (24, 100, 200) mounted within a recess (26) within the wheel hub portion (12). An adjustable numericaless colored scale (32) is adjusted to indicate proper inflation at the position of the indicator needle (30) when the tire is first inflated to the proper pressure to calibrate the scale. The tire gauge (200) can be precalibrated at the factory by positioning the dial scale (202) in a predetermined orientation to the case so that, at the desired predetermined pressure, the indicator needle (30) is aligned in the area (116) of proper inflation along the center line (104).

Abstract: A pressure gauge has a base which is provided with a slot, and a sliding block located in the slot such that the sliding block is pushed to displace by a piston rod which is in turn pushed by the air pressure to be measured. The sliding block is provided with a plurality of teeth for actuating a rotary shaft and a hand fastened at one end thereof with the rotary shaft. The hand is actuated to turn to point at an air pressure reading. The base is provided with a threaded hole, an adjusting screw engaged with the threaded hole, and a spring which is engaged at one end thereof with the sliding block and at other end thereof with the adjusting screw. The pressure gauge is calibrated by adjusting the position of the adjusting screw in the threaded hole.

Abstract: Disclosed is an indicator device for visually denoting the amount of filled dust in a dust container of a vacuum cleaner. The indicator device operates based on a vacuum pressure difference created between an air suction port and an outlet of the vacuum cleaner. When a vacuum pressure difference is created between the air suction port and the outlet of the vacuum cleaner, a disc-shaped colored film and a circular rotating member positioned in an upper cap of the indicator device receive an atmosphere air from the exterior of the indicator device and denotes the amount of dust filled in the dust container. For this purpose, a colored film is separated by 3.times.N (N is an integer) times and colored in three primary colors of light of red, green and blue or in three primary colors of red, yellow and blue.

Abstract: The internal fault indicator includes an open ended housing mounted in an opening in the wall of a transformer casing. An indicator lens is attached over a first open end of the housing and a diaphragm is attached over a second open end of the housing with the second end of the housing being positioned so that the diaphragm is subjected to internal pressure surges within the transformer. The diaphragm carries a trigger retainer which engages a trigger on an indicator shaft mounted for rotation within the housing. An indicator is mounted on the indicator shaft beneath the lens, and a bias spring is connected to the indicator shaft to bias the shaft toward rotation relative to the housing when the trigger is engaged with the trigger retainer.

Abstract: A coupling device for a pressure gauge includes an upper positioning plate connected spacedly to a lower positioning plate, a sector gear disposed between the lower and upper positioning plates and mounted rotatably thereto, an adjustment plate mounted adjustably on a top side of the sector gear, a push rod with a first end adapted to be in force-transmitting relationship with an actuating unit of a pressure gauge and a second end connected to the adjustment plate, a pinion meshing with the sector gear and to be mounted with an indicator needle of the pressure gauge thereon, a support plate mounted on a bottom side of the lower positioning plate for supporting distal bottom ends of axles of the sector gear and the pinion thereon, and a spiral spring for biasing the pinion to rotate the indicator needle to a starting position.

Abstract: A gage connected to the rod end of the wing cylinder on a multi-section implement senses rod end pressure at the output of the hydraulic wing control (HWC) valve. The HWC valve is engaged or disengaged using the selective control valve (SCV) in the tractor, and the gage provides a visual indication to the operator of the following modes: 1) off; 2) fold wings; 3) unfold wings; 4) field operation--push wings down; and 5) field operation--pull wings up. In field operation, the gage also provides an indication of the force with which the cylinders are pushing or pulling on the wings to affect the cutting force of the wings.

Abstract: A Bourdon's pipe that includes a clamping member at its sealed end. A threaded hole is bored through the clamping member into which a first bolt with a head is threaded whereat the head sealingly abut against the clamping member. The first nut has a passage including a constricted section with open end communicating with the interior of the Bourdon's pipe, and a valve seat adjacent to the constricted section. A movable ball-shaped valve is provided in the passage of the first bolt. A second bolt threaded into the passage of the first bolt to adjustably abut the ball-shaped valve against the valve seat.

Abstract: A device for the indication of dirt accumulation on an air intake filter by measuring the negative pressure in the clean air space of the filter, the device having a spring-biased diaphragm piston driving a pointer shaft by means of a bell crank with a gear segment, the pointer shaft carrying two diametrically oppositely arranged pointers with vertical and horizontal length portions moving in axial and radial portions of a pointer gap defined between the housing cover and an indicator dial carried by the cover. A ratchet mechanism serves to retain the pointer readout by blocking return movements of the indicator mechanism, the ratchet mechanism being releasable by means of a reset button on the cover of the device. The device is calibrated by means of an adjustable bell crank spring.

Abstract: The present invention provides a fluid handling device which operates as a combination check valve and fluid flow meter. The fluid handling device comprises a housing having an inlet, an outlet and a fluid passageway formed therebetween. A valve seat is contained within the housing in series with the fluid passageway while a valve member cooperates with the valve seat and is movable between an open and a closed position. A compression spring urges the valve member towards its closed position so that whenever the fluid pressure at the outlet exceeds the fluid pressure at the inlet, the valve moves to its closed position thus preventing reverse fluid flow through the device. Preferably, a tapered surface on the valve member forms a variable area opening at the valve seat which increases in area as the valve member moves from its closed and towards its open position.

Abstract: The present invention provides a fluid handling device which operates as a combination check valve and fluid flow meter. The device includes a housing having an inlet and outlet and a fluid passageway formed therebetween. The housing forms a valve seat in series with the fluid passageway while a valve member movable between an open and closed position cooperates with the valve seat to open and close the fluid passageway. A tapered surface on the valve member forms a variable area opening at the valve seat which increases in area as the valve member moves from its closed and towards its open position while a compression spring urges the valve member towards its closed position. An indicator needle is mechanically connected to the valve member and reduces an exteriorly visible signal of the position of the valve member which, in turn, is representative of the fluid flow rate through the device.

Abstract: A tire equalizer comprises a housing having upper and lower chambers divided by a flexible diaphragm opposing a seat in the upper chamber connected to one of the tires. The diaphragm is urged toward the seat by a spring-pressed inverted cup larger in diameter than the diaphragm and having an arm extended longitudinally from the cup away from the spring. The arm is curved in horizontal cross-section and its upper end is formed with a slot receiving an off-center pin on the back of an indicator disc. Also connected to the upper chamber is a fill conduit, and a conduit to the other tire.

Abstract: There is disclosed a novel indicator assembly comprised of a housing member mounted to a fluid handling apparatus and an indicator member mounted for rotation within the housing member operationally associated to a moving member of the fluid handling apparatus wherein the housing member is provided with transparent sectors permitting visual observation of the indicator member and wherein the indicator member is provided with colored sectors to visually cooperate with the transparent sectors of the housing member to indicate operational modes of the fluid handling apparatus.

Abstract: An apparatus for indicating tire pressure is disclosed which indicates whether the tire pressure in a pair of pneumatic tires is low, normal or excessive. The apparatus includes a valve body which is operatively connected to each of the tires and comprises a valve which longitudinally moves in the apparatus responsive to air pressure. The valve is operatively connected to a scale pan having an arcuate display portion at one end thereof. The display portion on the scale pan includes colored rectangular segments which are visible through a sight window in the apparatus. The scale pan pivots in response to valve movement and the colored segment visible in the sight window indicates whether the tire pressure is low, normal or excessive.

Abstract: Control system for indicating which, of a plurality of sensed pressure control fluid functions, first malfunctions. The system includes a plurality of series connected devices, each such device includes a shiftable valve which, in one position activates an indicator, and, in another position deactivates said indicator. Signalling connections link the devices such that all indicators, save the one governing the first malfunction, remain in the indicating condition they were in prior to such malfunction occurring.

Abstract: A tire monitor for use with a pair of pneumatic tires comprising a body member having a diaphragm valve mounted in a first chamber formed therein defining first and second chamber portions. A spring is provided in the first chamber portion for yieldably urging the diaphragm valve towards one end of the body member. A valve cap is secured to the other end of the body member and has first, second and third air passageways formed therein. A valve is connected to the third passageway for permitting air under pressure to be supplied to the second chamber portion at times. The diaphragm valve prevents communication between the first and second air passageways when the diaphragm valve is in a first position and also prevents communication between the third passageway and the first and second air passageways when the diaphragm valve is in its first position.

Abstract: An easily visible condition indicating device to signify a lack of pressure within the envelope of an electrical interrupter of the type utilizing a pressurized-gas environment. The system includes a rotatable drum contained within a housing having an aperture through which the drum is viewed. When pressure within the interrupter drops a spring-biased bellows collapses, causing the withdrawal of stops which hold the drum in place against spring tension. This allows a biasing spring to rotate the drum so that a different portion thereof, such as a different colored segment, is viewed through the housing aperture in order to provide a visual indication of a low-pressure condition.

Abstract: A pressure equalizing valve for pneumatic tires including a visual display is described which is ideally suited for use with dual tires. A cylindrical housing accommodates a spring biased diaphragm mounted in a first chamber. The diaphragm carries a valve member thereon and acts as a sealing member or element to close two air passageways which are in communication with the dual tires in a conventional dual tire installation. The valve member closes the air passageways when a pre-adjusted and calibrated value of air pressure is lost by the dual tires involved. Changes in the air pressures acting on the spring biased diaphragm are communicated to a diaphragm follower on the atmospheric side of the diaphragm. A visual display is operated with the diaphragm follower and responds at an eight to one ratio to the movement of the diaphragm and follower when air pressure changes occur and a resultant movement of the diaphragm and follower occurs.

Abstract: A well tool such as a multiple string tubing hanger is installed remotely with the aid of a handling tool which has a hydraulically actuated component and a locator device movable between a retracted inactive position and an extended position in which the locator device engages in a locator slot in a surrounding member to orient the well tool in a predetermined rotational position relative to the surrounding member, a pressure fluid conduit of the handling tool being connected to the hydraulically actuated component and a valve associated with the locator device in parallel so that full pressure on the hydraulically actuated component cannot be built up except when the locator key is in its extended position.

Abstract: Pressurized fluid circuits are provided which are suitable for use in a pressure drop detector for a pressurized fluid fire alarm system. The pressurized fluid circuits are provided as channels in the surface of a block of material and include one channel connected to a source of fluid pressure. The channels are associated with valve regions by means of which, with a diaphragm pressed thereagainst, a required one or more of the channels can be closed off.In its application to a pressure drop detector a normally pressurized region of the diaphragm may support a mechanical linkage of the detector such that if the pressure drops, on release of pressure in the system, the collapsing of the diaphragm allows the mechanical linkage to be released thus actuating a fire alarm.