Abstract: Apparatus useful for blending predetermined accurately measured quantities of gaseous components transferred from separate pressurized supply tanks to a gas blending system, preferably on input signals received from a computer. The gas blending system includes a mixing vessel, a pressure transducer associated with said vessel for measuring the pressure of the gases, and producing an output signal and transmitting same to the computer, a circulating pump connected in series via conduits which form a circuit, and valves; preferably a multi-component valve assembly operatively communicating the two ends of the conduits for flow of gas therethrough in providing the functions of purging gas from the system, evacuating the system of gases, admixing the gaseous components received from the pressurized supply tanks to form the gaseous blend, and producing a product output blend of the admixed gases.

Abstract: Method and apparatus for mixing a carrier gas with a foundry aggregate resin catalyst fluid in which the liquid catalyst fluid is vaporized to a gaseous state and is thereafter mixed with the carrier gas. A proper proportion between the two gases is established by the setting of variable valves which control the flow of the two gases. The setting of the variable valve for the carrier gas establishes a flow rate for that gas at a given load level. The variable valve for the other gas is then set to establish a flow rate for the other gas with the desired proportion between the flow rates of said gases at said given load level. When the gas mixture is drawn upon at said given load level or at reduced load levels, the valves retain their initial relative settings and maintain the desired proportion, regardless of load level.

Abstract: In an apparatus for mixing in given proportions two media, such as gases or liquids, the pressure of each said media is reduced to a working pressure by a respective regulator. The media from the regulators pass through a mixing means to a common mixing chamber through two gaps each of which is individual to a respective medium. The relationship between the length of the two gaps can be adjusted by means operative to control the proportions of the media in said mixture and the regulators are arranged to be controlled in a manner such that the pressures of the media before the gaps are held mutually equal.

Abstract: A flow control device is provided for controlling the pressure of a controlled fluid in a secondary line as a function of the pressure of a controlling gas in a primary line. The device includes a pressure regulator having a housing divided into upper and lower chambers by a diaphragm. A pressure divider is connected to the upper chamber in such manner that the pressure in the upper chamber is proportional to the pressure of the controlling gas. The secondary line is connected to the lower chamber. Fluid communication between an upstream portion of the secondary line and the lower chamber is controlled by a valve operatively associated with the diaphragm. When the pressure in the upper chamber is less than a predetermined pressure, the valve blocks fluid communication between the upstream portion of the secondary line and the lower chamber.

Abstract: An electronic breathing mixture control system which senses and controls oxygen component partial pressure of an underwater breathing mixture. Three oxygen sensors disposed within a mix chamber generate voltages proportional to the oxygen partial pressure in the mixture. These voltages are processed and compared with reference voltages using digital logic circuitry. The resulting processed signals control two light emitting diodes warning the user of improper oxygen partial pressure and in addition control a switch that actuates an oxygen valve which either restricts oxygen flow to the mix chamber or allows more oxygen to flow therein.

Abstract: A gas mixing device comprises a plurality of gas lines for the conveyance of the separate gases to be mixed, each of which has a pressure regulator with a pressure control. A common gas mixture line is connected to each of the gas lines downstream of the pressure controls therein and a constant admission pressure regulator is provided in the mixture line. Control pressure is provided from a control pressure source which, for example, may be at the tapping of the gas mixture line. The control pressure is connected to each of the pressure controls for the pressure regulators and the gas lines and this control pressure is regulated by control means which may be in response to the pressure in each of the individual gas lines or in response to the pressure in the common gas mixture line downstream of the constant admission pressure regulator means.

Abstract: Oxygen is mixed into hydrogen for use as breathing gas for divers, pressure chambers and the like in precise and regulated amounts. Provision is also made to prevent explosion of these mutually reactive gases during mixing.

Abstract: A continuously operable fuel injection device comprises a sleeve having a substantially triangular measuring window communicating with the outlet port of a main body, the sleeve being inserted in the cavity of the main body, and a control spool having an annular groove communicating with the inlet port of the main body through an axially extending hole and axially slidably inserted in the sleeve, the substantially triangular measuring window cooperating with the annular groove of the control sleeve to form a variable orifice. By axially sliding the control spool, any desired flow rate can be obtained.

Abstract: The medical altitude chamber is constituted by a pressuretight therapeutic chamber communicating with a source of a gas medium under pressure. It also incorporates apparatus for moistening the gas medium in the therapeutic chamber, said apparatus comprising a liquid reservoir whose lower part communicates through an adjustable throttle with the internal space of the jet pump nozzle, and a pressure regulator which has an inlet for communication with the source of the gas medium, a setting inlet for communication with the therapeutic chamber, and an outlet for communication with the upper part of the liquid reservoir.

Abstract: Calibrated control of the duty cycle of fast acting pulse valves provides highly accurate control of fluid flow through the valve. While the flow is precisely controllable, it is not directly proportional to the duty cycle and thus a calibration curve is needed for each valve.

Abstract: A gas mixing valve including a hollow piston slidably lodged within a sleeve. Openings are formed in the piston wall in adjustable alignment with inlet ports in the sleeve, the longitudinal spacing between the openings being substantially equal to the longitudinal spacing between their respective inlet ports. Longitudinal piston movement causes the inlet ports to be progressively blocked, the ratio between the effective unblocked portions of the ports remaining substantially constant. A pressure responsive means such as a diaphragm controls the longitudinal piston position so as to vary the effective portions of the inlet ports inversely to the pressure within the sleeve and piston. The variance in pressure drops across the inlet ports due to changes in the flow rate of the inflowing gases is thereby limited without altering the mixing ratio.

Abstract: A fluid-blending system supplies a constant preestablished ratio of two or more fluids through a common output conduit over a wide range of variations of the flow rate established through the output conduit by a pump controlling such flow rate. This constant ratio also is maintained in spite of variations in the different head pressures of the fluids supplied to the blender. Separate fluid supply chambers are used for each of the fluids to be blended and are connected in common to the output conduit. The inlet orifices for each of the fluid supply chambers are normally closed by diaphragm-controlled valves mounted in the chambers. The amount of valve opening is controlled by pressure-sensing diaphragms in response to a partial vacuum created by the demand for fluid in the output conduit.

Abstract: Oxygen is discharged from a source of supply into the cabin of an airplane under the control of an oxygen sensing device to maintain the supply of oxygen in each volume of air at a comfortable level but without increasing the pressure of the atmosphere in the plane above the pressure of the atmosphere at the altitude at which the plane is flying. Expressed in other terms, as the plane ascends to altitudes above a preset level, the partial pressure of oxygen is maintained at a preset comfortable level while the absolute pressure in the cabin decreases with the decrease in pressure of the atmosphere outside the plane and remains at a level above the preset height. This eliminates pressurizing the cabin or the need for breathing masks.

Abstract: A system for disposing of radioactive waste material from nuclear reactors by solidifying the liquid components to produce an encapsulated mass adapted for disposal by burial. The method contemplates mixing of radioactive waste materials, with or without contained solids, with a setting agent capable of solidifying the waste liquids into a free standing hardened mass, placing the resulting liquid mixture in a container with a proportionate amount of a curing agent to effect solidification under controlled conditions, and thereafter burying the container and contained solidified mixture. The setting agent is a water-extendable polymer consisting of a suspension of partially polymerized particles of urea formaldehyde in water, and the curing agent is sodium bisulfate.

Abstract: A method and apparatus for measuring and keeping constant the water content in a highly heated salt bath, by measuring the change in dew point of a gas flowed over the salt bath.

Abstract: An apparatus for diluting gas. The apparatus has a primary passage having at opposite ends an inlet for component gas and an inlet for a diluent gas, a secondary passage for collecting the mixture of the component gas and the diluent gas, and a plurality of gas pressure reducing tubes each having the same structure for reducing the pressure of gas flowing therethrough by the same amount and which are connected in parallel between the primary passage and the secondary passage.

Abstract: A device for metering the flow of two fluids, such as the flow of liquid fluid and air to an internal combustion engine, includes a respective duct for each of the two fluids, an ionic flow meter in each of the two ducts, a valve controlling the flow of one of the fluids through its duct and circuitry comparing the flow rates measured by the ionic flow meters and controlling the valve accordingly so as to maintain a desired ratio between the two flow rates.

Abstract: An elongated hollow tube containing a freely movable ball is used to indicate and vary the ratio between gases to be mixed by passing each gas into a separate end of the tube. A critical pressure relationship is established between the applied gases at any given location relative to each oppposite end of the tube and between the gas pressures at such locations and the pressure on each side of the ball respectively. This relationship is established using pressure regulators on each side of the tube with at least one restricting orifice in one gas line.

Abstract: A method for the control of proportion of two gases which are delivered to a mixed gas line for use for example in a respiratory breathing apparatus in which the gases are delivered to a mixed gas line from a pressure control vessel, comprises continuously monitoring the pressure in the control vessel and when the pressure therein is at an initial predetermined pressure admitting a first gas into the pressure control vessel until the pressure therein increases to a predetermined higher pressure and then stopping the admission of the first gas and initiating the admitting of a second gas into the pressure control vessel, continuing to admit the second gas until a predetermined additional higher pressure is achieved in the pressure control vessel, discontinuing the admission of the second gas when the predetermined additional higher pressure is reached and initiating the withdrawal of the mixed gas through the mixed gas line, continuing to withdraw the mixed gas through the mixed gas line until an initial press

Abstract: A method and automatic apparatus for determining the physical properties of an emulsion wherein a sample of the emulsion is allowed to settle in a sample cell formed by a capacitor. The interface level, as emulsion breaks and settles to its final value, is followed by measuring the cell capacity.

Abstract: A gas flow control system including a control for varying the flow rate of only one of two gaseous components forming an analgesic mixture to selectively vary the relative proportions thereof up to a pre-established maximum concentration of the one component and a control to vary the total flow rate of these components without varying the relative proportions thereof. Flow meters are provided to measure the relative flow rates and thereby determine the concentration of the gaseous components.

Abstract: A burner for Rankine cycle engines which includes a combustor of the rotating atomizer type and a control system therefor which keeps the ratio of fuel and air supplied to the combustor at an optimum over a wide range of operation to maximize efficiency and minimize the emission of pollutants from the combustor.

Abstract: An improved system for metering a plurality of fluids is described. The instant system utilizes time division switching in flow valves to provide accurate metering of a plurality of fluids from individual reservoirs.

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: This invention relates to a diver's re-breathing apparatus of a closed circuit type. The gas circuit is provided with a solenoid valve coupled to an oxygen cylinder and arranged to be energised to introduce oxygen into the breathable atmosphere when the oxygen content therein drops below a certain proportion.The electrical circuit comprises a pair of transducers in the gas circuit, one of which is sensitive to oxygen partial pressure and the other sensitive to total pressure, the outputs of the two transducers being amplified and fed into an analogue divider, the output of the divider being responsive to percentage of oxygen in the breathable atmosphere and being effective to energise the solenoid to thereby maintain the oxygen content of the breathable atmosphere within limits of percentage, rather than within limits of partial pressure.