Abstract: A direct acting flow control valve operative by an actuator responsive to fluid pressure from an external source. The actuator includes a pair of spaced apart pistons and associated rolling diaphragms which define an actuator chamber into which the fluid pressure is admitted, and a separate leakage chamber into which fluid will pass on leaking through a defective diaphragm, the leakage chamber being adapted for communication with an external indicator, shutoff valve or the like.

Abstract: A system which is especially useful in controlling fuel gas flow in a flame atomic absorption spectrophotometer includes a master fluid flow path and a slave fluid flow path connected to receive fluid from a common source connection. A first valve is connected in the master path for controlling the rate of fluid flow therein. A first orifice device is connected in the master path between the common source connection and the first valve. The slave path includes a pressure responsive fluid flow modulating valve having a control connection to the master path between the first orifice device and the first valve. A second orifice device is connected in the slave path between the common source connection and the flow modulating valve. The flow modulating valve is operable in response to the fluid pressure in the master path as reduced by the first orifice device and in response to the fluid pressure in the slave path as reduced by the second orifice device to control the fluid flow through the slave path.

Abstract: A valve for controlling the flow of water to a filter of a swimming pool has a tubular member with a main inlet opening at one end connectable to a suction hose, an outlet opening at its other end connectable to a suction source, an auxiliary opening intermediate its ends and a communication opening also intermediate its ends. A sleeve is located about the tubular member to be slidable therealong and is positioned on one side of the communication opening. A flexible bellows is secured at one end to the sleeve and at its other to the tubular member on the other side of the communication opening to define a varible volume chamber in communication with the interior of the tubular member via the communication opening. A closure is located in the auxiliary opening and is fast with the sleeve to be slidable therewith. A spring urges the sleeve into a position in which the auxiliary opening is substantially closed.

Abstract: A laser beam duct pressure controller system for maintaining a spatially uniform pressure in a flowing gas volume which is subjected to temporal pressure variations. This desired result is accomplished, with cooperating structural components (and gases therein) which eliminate the axial flow of a conditioning gas within the laser beam duct, by matching the time rate of change of the pressure of the flowing conditioning gas to the time rate of change of the pressure in the cavity of an operably associated laser beam turret.

Abstract: An inverter apparatus for producing an increasing vacuum effect in response to a decreasing vacuum field. A piston is axially movable within a cylindrical bore. The piston has a first surface exposed to atmospheric pressure. A spring biases the piston in a direction opposed to the direction of movement which would be produced by atmospheric pressure on the second surface. A fluid inlet passageway extends through the cylinder and opens into the cylindrical bore, the piston having an axially extending side wall facing the cylindrical bore. An orifice formed in that side wall and an outlet passageway located at one end of the orifice connect that end with the chamber having the vacuum acting on the first surface of the piston. The axially extending orifice is so located in the side wall of the piston as to provide a decreasing restriction to flow of fluid from the first passageway through the orifice to the outlet with decreasing vacuum.

Abstract: A flow controller primarily for breathing gas analysis has a gas flow circuit leading from a breathing air inlet to a gas analyzer and to a vacuum source. Another gas is bled into the circuit between the breathing air inlet and a point upstream of the vacuum source. Such other gas is precluded from flowing upstream in the circuit toward the gas analyzer by making the intervening flow path or conduit of suitable dimensions to have a Peclet number at least equal to 4 and preferably greater than 4 and about 6.

Abstract: All but the circle drive motor of the implement actuators of a motor grader are divided into two groups each consisting of those which need not be operated simultaneously. The power system has three fixed displacement pumps for driving the circle drive motor via a circle control valve and the two implement actuator groups via respective implement control valve arrangements of carry-over parallel configurations. One of the pumps is connected to the two implement control valve arrangements via a restriction and a flow divider. A first demand valve controls communication between the other two pumps and the implement control valve arrangements in response to the pressure differential across the restriction, maintaining constant fluid flow to the valve arrangements regardless of engine speed or the loads on the implement actuators.

Abstract: A hot and cold water pressure regulating mixing faucet with automatic hot water shut-off in the event of cold water failure. The faucet maintains a predetermined discharge pressure less than the supply pressure regardless of the amount of water issuing from the faucet in combination with parts in a flat face slide valve surface to regulate the amount of water issuing from the faucet or the proportionate mixture of different or hot and cold water, and in combination with a concentric rotary proportioning selector valve having an axial bore containing the pressure regulator valve operable axially within the bore of the rotary selector valve. The pressure regulator valve is operable to completely shut off the hot water in the event of cold water failure. The slide valve and the rotary proportioning valve and the pressure regulating valve are coaxially concentric to each other cooperating in performing their valvular function upon the water entering the housing and discharging axially.

Abstract: A method and apparatus is provided for obtaining mixtures in predetermined proportions of a primary liquid and secondary liquid while the stagnation pressure and mass flow of the primary liquid are varying. The apparatus comprises a passive device having a passageway extending therethrough. A first section of the passageway for receiving the primary liquid has a decreasing area. A second section of the passageway for receiving the secondary liquid has an area substantially equal to the minimum area of the first section.

Abstract: A vacuum pressure regulator responsive to the pressure established at a variable source of pressure such as the manifold of an engine to move a valve element in proportion to such pressure to admit air at atmospheric pressure to mix with air at vacuum pressure thereby momentarily reducing the level of vacuum pressure made available for the operation of various vacuum operated devices.

Abstract: A gas switching device for use with a gas supply system in which two gases, for example, oxygen and air are supplied to a medical unit comprises a manifold 106 to which are attached two identical valve assemblies 108, 110. The manifold has a first inlet 1 and outlet 5 for the passage therethrough of the oxygen and a second inlet 2 and outlet 6 for the air. Each valve assembly 108, 110 includes a spool valve 122 movable from a first to a second position under the influence of the pressure of its associated gas. At least one valve assembly 110 has an inlet 18' communicating with a passageway 15 in the manifold which, in turn, communicates with the inlet 1 for the oxygen and an outlet 22 communicating with a further passageway 16 in the manifold which in turn communicates with the outlet 6 in the manifold for the air.

Abstract: A system for supplying foam liquid concentrate via a concentrate pump to one or more water pump discharge outlets. The concentrate pump is powered by a variable output hydraulic drive which in turn is automatically modulated independently of the level of operation of the water pump by a control system which is responsive both to the water pressure developed by the water pump and to the foam liquid concentrate pressure developed by the concentrate pump.

Abstract: A liquid flow control device is disclosed for delivering either cold water or hot water mixed with cold water comprising a chamber having an inlet for cold water and an inlet for either hot water or mixed hot and cold water and a discharge outlet for connection to a sink delivery fitting, a solenoid operated valve which stops and starts the flow of cold water through the chamber, a solenoid operated valve which stops and starts the flow of hot water or mixed hot and cold water through the chamber and a switch for each solenoid the arrangement being such that some cold water flows through the device each time the latter operates.

Abstract: A fill valve, or aspirator, which is adapted to be connected to a superatmospheric pressure source, such as helium, and which is capable of intermixing at least two fluids in intimate fashion, wherein in one embodiment, actuation of a slide-like member allows introduction of a second fluid, for example, ambient atmosphere, so that ambient atmosphere is drawn into the fill valve by reason of a venturi effect due to the interior configuration of the fill valve so that an air and helium mixture may be obtained. The fill valve ideally, in the most efficacious embodiment may be utilized for filling inflatable members with a combination of air and helium so as to decrease the cost of the fluid for inflating the inflatable article.

Abstract: An apparatus for pneumatically actuating slave devices in direct response to the discharge of a dry chemical fire extinguishant is disclosed comprising at least one main fire extinguisher from which pressurized dry chemical fire extinguishant passes into a main discharge pipe, and a cartridge containing a pressurized gas connected to the main discharge pipe through an actuator valve. The actuator valve includes a resilient check closing the valve due to the pressurized gas in the cartridge and a piston having a head fit into the actuator valve at sufficiently close tolerance to minimize gas transfer therethrough. The piston head is disposed toward the main discharge pipe and an integrally connected base portion faces the tip of the check and is disposed such that depression of the piston head into the actuator valve moves the check, opening the valve and releasing the contents of the cartridge into a secondary discharge pipe.

Abstract: This invention provides a valve by means of which a major portion of the suction flow of a swimming pool filtration system is channeled through an automatic cleaning device which cleans the floor and/or wall of a swimming pool, and a minor portion of the suction flow is drawn from the surface of the pool thereby to skim the surface. The valve has a main inlet opening connectable to the device, an outlet opening connectable to the filtration system and an auxiliary opening which is closed to some extent by a closure member to normally provide a restricted aperture through which the water drawn from the surface flows. The closure member is biassed closed by a spring located in a variable volume chamber which communicates with the interior of the valve between the auxiliary opening and the main inlet opening. When the restricted aperture is blocked by leaves or the like, the pressure in the chamber decreases, compressing the spring and allowing the closure member to open.

Abstract: A beverage dispensing system has a container from which beverage is to be dispensed by a gaseous mixture of air and carbon dioxide from passage 31. Air pressure for dispensing is derived from compressor 7. Carbon dioxide 11 is capable of communication with the container by way of a diaphragm valve 14 which normally closes communication between the carbon dioxide source 11 and the container. Diaphragm 16 of valve 14 is responsive to variations in pressure derived from compressor 7 so that the valve 14 opens communication between the carbon dioxide source 11 and the container when mixed gases are demanded. The diaphragm 16 controls displacement of a spool 19 which determines the opening and closing of communication between the carbon dioxide 11 and the container. A chamber 17 communicates with the air line 9 while a chamber 18 communicates with the container and is capable of communication with the carbon dioxide 11 under control of the spool 19.

Abstract: A control valve for injecting dilute concentrations of liquid additives to a fluid flow in which a housing (10) is connected to a core member (12) and a piston valve (18) that is slidingly maintained within the core member is controlled in response to the movement of a shut-off member (14) pivotally connected to the housing.

Abstract: A system is disclosed for controlling the flow of fluid from a pair of pumps (15,15') to a steering system (11) and a pair of auxiliary load circuits (13,13'). The steering system includes valving (43) defining a variable flow control orifice (45), and the steering system normally operates with a pressure differential X across the variable orifice, and provides load pressure signals (47,49,49',53,53') representative of demand for fluid by the steering system. Fluid flow from the pumps is controlled by a pair of priority flow control valves (21,21') including a pair of valve members (27,27') each of which is biased by a spring (29,29') toward a position permitting flow to the steering system. The spring (29) exerts a biasing force equivalent to the pressure differential X while the spring (29') exerts a biasing force equivalent to a pressure differential Y, which is less than X.

Abstract: This invention concerns a multi-liquid flow proportioning device comprising a vessel adapted to contain a first liquid, a container within said vessel adapted to hold a second liquid separate from said first liquid, separate inlet and outlet means respectively for the portion of said vessel adapted to contain said first liquid and for said container, said container including a wall portion adapted to move in use in resopnse to changes in pressure of its liquid contents, and means operable by the movement of said wall portion to control the liquid flow into the inlet of said container whereby tending to maintain the volumetric contents thereof generally constant. The invention has particular application to combining water and fire retardant.

Abstract: This invention provides a direct oil return system from the accumulator tank in the refrigerant circuit of a transport refrigeration system to the crankcase of the compressor for returning oil entrained in the refrigerant to the oil sump. A pressure relief valve in the lubricating oil circulating system positively opens under the influence of oil pressure from the positive displacement oil pump whenever the compressor is operating to bleed excess oil from the pump back to the sump. The oil return line from the accumulator tank of the refrigeration system is connected to the valve to enter through another inlet port which opens in response to the pressure relief valve being opened and flows therethrough to another outlet in the valve also in communication with the sump.

Abstract: The device is especially intended for a pipe supplying a fluid which must be supplied, simultaneously or alternately, with another fluid. The device comprises a tank for a control fluid which surrounds the vertical supply pipe and in which a permanent magnet moves in accordance with the amount of control fluid contained in the tank. The magnet shifts a valve member inside the supply pipe so that the valve member closes the latter in one of the end positions of the magnet. The magnet is rigid with a float which freely extends around the supply pipe. The device can in particular ensure that fuel is supplied to an engine only if oil is supplied to the latter.

Abstract: An Automatic fluid component Shut Off System which automatically shuts off the flow of one component in a plural component system when the pressure in another component falls below a predetermined amount. The system is comprised of pneumatically operated sources of fluid components such as a catalyst and a resin which are mixed as they are sprayed on an article. The automatic shut off system is comprised of a pressure sensing valve which is connected to one of the components to provide a pressure control point and controls the supply of air to an air operated servo valve controlling the flow of the other fluid component. The pressure control point is established by adjusting an air pressure regulator connected in series with the pressure sensing valve.

Abstract: A spray device having a body member including a nozzle at one end thereof formed with an orifice and a pressure chamber formed in the other end thereof. The body member is provided with a first passage which serves to deliver sprayable liquid to the orifice under the control of an axially movable needle valve which is adapted to open and close the orifice. A second passage is formed in the body member for simultaneously directing pressurized air to the pressure chamber and to the nozzle for atomizing the sprayable liquid as it flows through the orifice.

Abstract: A fluid proportioning valve adjustable to provide a plurality of specific predetermined fluid proportions. To adjust the valve for one of the predetermined fluid proportions, the extent of displacement of a flow displaced proportioning piston is preselected by engagement of an adjustable stop member in one of a plurality of specific stop positions.

Abstract: A liquid metering and mixing device specifically for the metering and mixing of gasoline and oil for a two-cycle engine wherein addition of gasoline to a rotatably mounted measuring member for a gasoline tank actuates a valve means which opens for a short period of time letting a small amount of oil into the measuring member.

Abstract: The invention provides an exhaust valve comprising a valve body, an inlet duct in the valve body for receiving gas to be exhausted through the valve, an exhaust duct in the valve body for exhausting the said gas from the valve, and a valve member subject on the one hand to the ambient external pressure and on the other hand to the pressures in the inlet and exhaust ducts, the valve member moving according to changes in the said pressures between an open position in which there is communication between inlet and exhaust ducts for the exhaustion of gas through the valve and a closed position in which it cuts off such communication; the valve member is preferably mounted in a diaphragm. It also provides a similar valve in which the valve member is instead subject on said one hand to a predetermined maintained fluid pressure, e.g. that within a pressurized chamber. The latter valve can be used to control the pressure in an exhaust line from the exhaust valve.

Abstract: At least two gas streams are passed into a surge vessel. The flow rate of a first one of the gas streams is manipulated responsive to either the deviations of the pressure in the surge vessel from a first pressure value or the deviations of the flow rate from a set value, depending on which would provide the larger flow rate. The flow rate of a second stream is manipulated responsive to deviations of the pressure in the surge vessel from a second pressure value which is higher than the first pressure value. The system is particularly applicable to the selective use of in-plant produced fuel gas, natural gas and liquefied petroleum gas to supply fuel gas demands in a plant, with the natural gas stream and the propane stream being the first and second streams, respectively.

Abstract: A variable-venturi nozzle for the measurement and regulation of flows in gas conduits, in particular in internal combustion engine intakes, wherein at least one wall element in the zone of the venturi throat thereof is in the form of at least one elastic wall deformable under the action of the pressure of a control fluid.

Abstract: A novel system for metering a relatively viscous fluid into a less viscous fluid using a centrifugal pump is described. In particular, a novel valve for use in the system including a fluid pressure responsive means to actuate a needle valve which is slideable into an orifice for control or metering of the viscous fluid is described. The valve meters decreasing small amounts of the viscous fluid in direct relation to the increased pressure developed at the delivery end of the centrifugal pump because of the selection of the angle of the point of the needle and its relationship to the orifice. The system is particularly adapted to metering viscous polymer containing fluids, including microdispersions of polymers as solutions or true solutions into water in very small amounts thereby reducing friction and increasing fluid flow in delivery conduits such as fire hoses and the like.

Abstract: An easily cleaned trigger-actuated gun of simplified construction for applying a multi-component resinous patching or adhesive compound system to a workpiece is described. An internal valve positioner, connected to the trigger mechanism by means of an operating rod, regulates flow of compound from the gun, between zero, intermediate or full flow rates in response to trigger position, by adjusting clearances between simple flow checking ball elements and their valve seats at each component inlet into the gun. The metered components flow through a static mixer tube, onto the workpiece.

Abstract: An atomizer, particularly suitable for atomizing grease or lubricating compositions and useful in the foundry industry for lubricating molds, comprises a chamber in which is mounted a piston which is displaced from a rest position to an operative position by air under pressure against the effect of a spring operable to urge the piston to the rest position. Air under pressure is admitted to the chamber through an air inlet which is in constant communication with an outlet to the chamber by way of an air passage through the piston. An inlet for the composition to be atomized is controlled by a valve and opens to the chamber at a location at which it is closed when the piston is in the rest position and at which it communicates, in the operative piston position, with the air passage through a further passage provided in the piston so that the composition to be atomized is drawn by a Venturi effect into the air passage and entrained in the air flowing therethrough.

Abstract: A valve device having a pressure operable valve piston, particularly for booster steering system, to selectively control pressure flow to a consumer device such as a hydraulic servomotor in order to permit use of a reserve pump in event of failure of a main pump. The valve in a neutral position combines the output of both pumps but is responsive to a first increase in the flow rate beyond a predetermined limit to shunt flow from the reserve pump to a sump. Upon further increase in the flow rate the valve piston moves to a position to also shunt part of the output from the main pump to a sump. Signal means is actuated by movement of the valve piston to apprise a vehicle driver that the steering system is operative.

Abstract: A device to proportionately mix fuel and lubricant for use in a two cycle engine which has no internal mixing device incorporated therewith comprising a cylindrical lubricant container, a columnar fuel delivery inlet which perpendicularly angles to merge with and to feed fuel into a conical funneled mixing chamber immediately below the base of the lubricant supply container. An axially secured butterfly lever in the line of fuel inlet travel is depressed by passing fuel and activates a spring-loaded piston valve which allows a proportionate flow of lubricant to the mixing chamber.

Abstract: A life support system providing breathable gas from a high pressure source utilizes an exhaled gas treatment device to eliminate harmful components from exhaled gas and incorporates a novel rebreathable gas mixing and supply device in which inhalation pressure of the user activates a fresh breathable gas supply valve which, in turn, jets the fresh breathable gas into and through a mixing chamber, providing a booster type suction force to pull exhaled gas through the treatment device, mixing the treated, purified gas with the fresh gas and supplying the resultant mixture to the user.

Abstract: A headlamp cleaning assembly of the type for cleaning vehicle headlamps and including first and second nozzles for jetting an air/liquid mixture against a headlight surface. A regulator means is included for mixing air and liquid and for sequentially supplying the resultant air/liquid mixture to the first nozzle for a first period of time and then to the second nozzle for a second period of time to complete one cycle. The regulator includes a piston slidably disposed in a cavity to define an air/liquid mixing chamber which is opposed by a liquid charging chamber. The piston also defines an air actuation chamber which, when supplied air, moves the piston from a start position to a charged position to charge by filling the charging chamber with liquid. A stem is connected to and extends upwardly from the piston and is slidably disposed in a stem chamber for actuating an air valve which, in turn, allows pressurized air to flow into the stem chamber.

Abstract: An adjustable check valve for use in an oxygen regulator to establish limits at which a resiliently biased disc moves away from a seat to allow air to enter an atmospheric chamber. A regulator is connected to a linkage which operates an air flow valve and an oxygen proportioning flow valve. The regulator is responsive to inlet oxygen pressure such that a change in altitude causes a corresponding change in flow relationship of air through the air valve and oxygen through the oxygen valve.

Abstract: An improved apparatus for spraying chemicals from a vehicle. Chemical concentrates from a separate supply tank are injected at a rate proportionate to the vehicle's land travel speed into water which is dispensed at a constant rate. A water pressure activated control means prevents injection of the chemical concentrate into the water line when the water pressure is not within the predetermined range which will assure nozzle spray pattern.

Abstract: A fuel system in which excess fuel is recirculated from the charge forming apparatus, including means for regulating pressure of the recirculated fuel which in turn influences the air-fuel ratio of the charge forming apparatus. One embodiment of the regulator includes manual adjusting means for maintaining a stable pressure and air-fuel ratio, while another embodiment includes an electronically controlled transducer for varying the pressure and air-fuel ratio while the engine is operating.

Abstract: The present invention is directed to a supply circuit for a hydraulic jack employing two pumps in which a valve is positioned in a pipe which is branched to the delivery pipe of the first pump and is controlled by two jacks supplied by the fluid delivered by the second pump. A constrictor is positioned in the supply system for one of the jacks and another constrictor is placed in the discharge system for the two jacks with the invention being particularly applicable to achieving a stable control circuit for the load relief of the first pump.

Abstract: A carburettor having a slow running jet with a device for controlling the output of the slow running jet during deceleration. The device comprises an axially movable closure member inside the jet, its axial movements being dependent upon the magnitude of depression downstream of the normal butterfly throttle. The closure member has passage means allowing fuel flow to pass from a fuel inlet into the slow running jet and its movements are controlled by a diaphragm acted upon at one side by atmospheric pressure and on the other side by the pressure prevailing in the downstream side of the carburettor or the induction manifold.

Abstract: Proportioning apparatus comprising a pair of coaxial tubular members with passages having first and second outwardly extending walls of the same cross-sectional configuration, first and second valve bodies for coaction with said walls for progressively opening and closing said passages, said first valve body slidably mounted on one of said tubular members, said second valve body connected to said first valve body for movement therewith and biasing means urging said valve bodies to their closed positions.