Abstract: Multi-stage in-line cartridge ejectors for a fuel cell system provided herein comprise: at least one ejector main body for supplying hydrogen, each ejector main body including a plurality of nozzles arranged in line with a predetermined gap, in which the diameters of the respective nozzles become larger from an inlet side of the ejector main body toward an outlet side thereof, and a plurality of sub-inlets formed on an outer surface of the ejector main body to be connected to the gap or gaps between the nozzles; and a housing accommodating the eject main body and including a main inlet for intake of recirculated hydrogen. The multi-stage in-line cartridge ejectors can improve the system performance by increasing the amount of recirculated hydrogen. Moreover, at least one check valve is provided at an intake position of the cartridge ejectors to effectively prevent reverse flow of recirculation hydrogen gas and at least one heater is provided around the cartridge ejectors to improve cold startability.

Abstract: Three ejectors 5, 7, 9 with differences in specification are connected in parallel between a hydrogen storage unit 3 and a fuel cell 1. Respective ejectors 5, 7, 9 allow excess hydrogen, discharged from the fuel cell 1, to pass through a hydrogen recirculating common flow passage 35 and to be recirculated through three recirculation branch flow passages 37, 39, 41. Shut-off mechanisms 13, 15, 19, 21, 25, 27 are disposed at both upstream and downstream sides of the respective ejectors 5, 7, 9, with closing and opening of the shut-off mechanisms located at both the upstream and downstream sides of the respective ejectors 5, 7, 9 permitting the three ejectors 5, 7, 9 to be properly used.

Abstract: A valve system for use in a system including a first source of a first pressurized fluid and a second source of a second pressurized fluid includes a valve housing including a first inlet port adapted to be placed in fluid connection with the first source, a second inlet port adapted to be placed in fluid connection with the second source and an outlet port. The valve system further includes a backflow prevention system to prevent flow of the first pressurized fluid through the second inlet and to prevent flow of the second pressurized fluid through the first inlet port. The valve system is adapted to provide a fluid path between at least the first inlet port and the outlet port to enable fluid to be drawn from the outlet port to the first inlet port. Several of the valve systems of the present invention provide for flow from the first inlet port to the outlet port and concurrent flow from the second inlet port to the outlet port.

Abstract: A powertrain includes a first pump and a second pump. A conduit defines a passageway for providing hydraulic pressure from the first pump or the second pump to a transmission. A valve assembly is configured to selectively supply hydraulic pressure to the passageway solely from the first pump, solely from the second pump, and from both the first and second pumps. The valve assembly thus enables the first and second pump to augment one another, thereby enabling the size of at least one of the pumps to be smaller than would otherwise be possible without the valve assembly.

Abstract: A control device which quickly adjusts a low pressure processing chamber to a desired pressure regardless of gas type, gas flow rate or target pressure simply by optimizing constants.

Abstract: A thermal mixer reduces the temperature of flue gas supplied to a fabric filter. Two spray dry absorbers are operable to cool flue gas. A housing of the mixer has first and second inlet passages for gas from the absorbers, an outlet passage for gas to the fabric filter, and a mixing passage. A set of damper vanes extends in the mixing passage and has a mixing position for mixing the flue gases from the inlet passages to supply mixed gas to the outlet passage at relatively high pressure drop but lower temperature if one of the absorbers in not operating. They have a non-mixing position for passage of gases without mixing and at low pressure drop when both absorbers are operating. The invention can also be used to improve mixing of combined gas streams initially having different chemical compositions or amounts of particle loading.

Abstract: A thermal mixer reduces the temperature of flue gas supplied to a fabric filter. Two spray dry absorbers are operable to cool flue gas. A housing of the mixer has first and second inlet passages for gas from the absorbers, an outlet passage for gas to the fabric filter, and a mixing passage. A set of damper vanes extends in the mixing passage and has a mixing position for mixing the flue gases from the inlet passages to supply mixed gas to the outlet passage at relatively high pressure drop but lower temperature if one of the absorbers in not operating. They have a non-mixing position for passage of gases without mixing and at low pressure drop when both absorbers are operating. The invention can also be used to improve mixing of combined gas streams initially having different chemical compositions or amounts of particle loading.

Abstract: A fluid flow regulator useful with swimming pool suction cleaners includes a flow passage conduit for connection between a suction pump and the pool cleaner. A flow bypass conduit is connected to the flow passage conduit for injecting an ambient fluid into a bypass flow passage. A valve operates within the bypass flow passage with a spring carried entirely within the bypass passage for urging the valve toward a seated position. An adjustment knob acts on the spring for modifying a biasing force on the valve urging the valve toward the seated position in opposition to a pressure from a fluid flow within the flow passage urging the valve to the open position.

Abstract: Systems and methods are disclosed for controlling a viscosity of a fluid. The control system includes a controller controlling an input to an actuator and an observer estimating the viscosity of the fluid. The controller includes an input, and the actuator is capable of controlling a viscosity of a fluid by delivering a gelling agent to the fluid. The observer and the controller are coupled together. The observer may be used to determine the viscosity at the current time from a sensor and filter combination that lags the actual viscosity value. The estimated sensor and filter output may be then compared to the sensor and filter output to make corrections to the estimate of the viscosity of the current time.

Abstract: A simple, reliable system is provided for automatically dosing vehicle fuel tanks with a fuel additive, particularly a concentrate containing a fuel borne catalyst (FBC), using gravity as the means of injection, preferably with no electronics or complex mechanical parts. The system includes a supply line for feeding fuel additive by gravity from an additive reservoir and opening into a filler spout of a fuel tank, a ball-in-seat valve at the end of the supply line biased in normally closed position and operable to an open position by mechanically pressing a release on the ball-in-seat valve, and a pivotable lever positioned within the filler spout and including a projection capable of mating with the ball-in-seat valve release upon pivotable movement. Upon insertion of a filler hose into the filler spout, the filler hose moves the lever and projection to press the release on the ball-in-seat valve thereby dispensing additive.

Abstract: A self-contained oxygen generator containing a PSA unit and a flowmeter in the outlet line. The flowmeter provides a signal which represents the flow rate of the oxygen in the outlet line. A leakage circuit with a calibrated orifice and a solenoid valve are also located on the outlet line. In response to a signal from the flowmeter, the solenoid can be actuated so as to provide a calibrated leakage at the outlet of the PSA. This calibrated leakage is useful when overall oxygen usage is too low.

Abstract: There is provided a proportioner for the internal admixture, at a constant proportioning ratio, of an inflowing liquid additive to a liquid carrier, the proportioner including a first flow-attenuating means, and a second flow-attenuating means, wherein the first and second flow-attenuating means are mechanically coupled and biased by biasing means against the carrier inflow.

Abstract: A fuel cell system in which fuel is supplied to a fuel cell arrangement and/or a reformer by an injector, where the anode exhaust gas of the fuel cell arrangement is recirculated to the injector. The fuel cell arrangement is connected to an intake opening of the injector which also has an inlet opening, a following nozzle, a following diffuser with an outlet opening and an intake opening for feed of the anode exhaust gas of the fuel cell arrangement. A chamber is formed between the nozzle and the entry area of the diffuser, and a slide is positioned within the chamber to move from a first slide position permiting the passage of the fuel from the nozzle to the outlet opening and a second slide position where the passage of fuel is prevented.

Abstract: A vacuum feed system for feeding liquid chemical into a stream of a second liquid flowing in a conduit includes a venturi connected in the conduit for supplying vacuum through first and second one-way check valves, a flow regulating valve, and a vacuum regulated flow control valve connected to a supply of liquid chemical to be fed. A pressure relief valve connected between the first and second check valves prevents back flow through the system. The components of the system, from the vacuum regulated flow control valve to the venturi, are arranged to provide a continuous upward flow path to thereby eliminate trapped gas in the system.

Abstract: A water supply failure protection valve is connected to hot and cold water supplies. The failure protection valve is responsive to the loss of cold water supply pressure to shut off all water flow. The failure protection valve is responsive to the loss of hot water supply pressure to permit cold water flow through both a cold water flow path and a hot water flow path so as to ensure a substantial flow of water to a downstream fixture. The supply failure protection valve may be integrated with a thermal mixing valve to provide water at a preselected temperature.

Abstract: A control mechanism (20; 70) and a method for use in an installation for transporting bulk material, granular material or powdery material through a conveyor line (1) with the aid of a pressurized gaseous medium. The control mechanism (20; 70) is arranged for being connected to the conveyor line (1) for the purpose of introducing a pressurized gaseous medium (15) therein and comprises a connecting opening (24) for connecting the control mechanism (20; 70) to an inlet (25) in the conveyor line (1), an intake (26) for gaseous medium (15), which is in communication with the connecting opening (24), valve means (28; 71), which operatively engage the intake (26), and means (31, 32, 35, 50, 51; 32) for controlling the valve means (28; 71) associated with the pressure of the gaseous medium in the conveyor line (1).

Abstract: A hydraulic valve assembly, for use in a hydrostatic transmission, for controlling fluid transfer between a first, a second and a third line, wherein two of the lines define first and second pressure lines, within a closed-loop circuit. The valve assembly comprises: a valve body having ports in communication with the three lines; a spool bore; a valve spool, adapted for sealing reciprocation within the spool bore, having a first and second end portion, a connecting portion, and a first and second bypass orifice within the valve spool; and dampers for centering the valve spool. This spool is movable from a neutral position occurring when the fluid pressure forces in the first and second pressure lines are substantially similar, to a first or a second position occurring when the fluid pressure force in the first pressure line is greater or less than that in the second pressure line, respectively.

Abstract: An apparatus and method for distributing a fluid. A fluid distribution device includes a flow chamber comprising an inlet and an outlet, an equalization chamber; and a diaphragm separating the flow chamber and the equalization chamber, wherein a valve positioned in a flow path between the flow chamber inlet and the flow chamber outlet comprises a valve body coupled to the diaphragm.

Abstract: The invention provides a vacuum safety valve for a vacuum system that can be used for debris collection, and which is especially useful in trench rescue. Under predetermined vacuum level conditions (e.g., when the airflow path of a vacuum system is blocked by an obstruction), the safety valve is designed to automatically open radial ports around the circumference of the safety valve. When the radial ports are opened, the vacuum level in the vacuum system between the obstruction and the safety valve is at least significantly reduced thereby preventing full vacuum from acting on the obstruction. In a preferred aspect, the safety valve further comprises a manual vacuum release such that an operator can trip the release and reduce the vacuum level in a vacuum system comprising the safety valve. The invention also provides a related vacuum system and/or vacuum rescue system including additional elements and methods of debris removal using the inventive systems and nozzles.

Abstract: The ejector includes a diffuser, a nozzle, a needle, and a drive section. A throat portion and an increasing diameter portion are formed in a third conduit of the diffuser, and the nozzle and the needle are arranged coaxially with the third conduit. A first taper section of the needle is inserted into an aperture portion of the nozzle, and a second taper section is housed in the increasing diameter portion. A gap between the aperture portion and the first taper section constitutes a first fluid conduit, and a gap between the increasing diameter portion and the second taper section constitutes a second fluid conduit. The needle is provided so as to be shiftable in its axial direction by the drive section, and, by shifting the needle in its axial direction, it is possible to change both the first fluid conduit and the second fluid conduit simultaneously.

Abstract: A dosing valve apparatus for introducing a metered dose of a second fluid to a first fluid comprises a first, or main body, portion (1), a second ball valve portion (3) and an end cap (2). The main body (1) and ball valve (3) contain first and second chambers (13, 14), respectively, into which flow the first and second fluids. An orifice jet (8) and needle valve (11) control flow of the second fluid from the second chamber (14) to the first chamber (13). Within the first chamber (13) is a pivotable paddle (7) which is adapted to act upon the needle valve (11). In this way, flow of the first fluid into the first chamber (13) acts upon the paddle (7), which in turn causes the needle valve to at least partially open the orifice (8) allowing the second fluid into the first chamber (13) to mix with the first fluid.

Abstract: The subject invention is a valve for regulating the viscosity of fluid. The valve includes a housing defining a bore having a first inlet supplying “cold” hydraulic fluid at a first viscosity and a second inlet supplying “hot” hydraulic fluid at a second viscosity. A spool valve disposed within the bore has at least one land to proportionally control the flow of hydraulic fluid through the inlets. Hydraulic fluid from the first and second inlets mixes within the valve and exits the valve through an outlet at an optimum viscosity. A flow restrictor creates a pressure force on the spool valve that is proportional to the viscosity of the hydraulic fluid flowing through the outlet.

Abstract: A pressure-control valve (1) comprises a first control piston (1), which is disposed between a first pressure chamber (6), which adjoins the first control piston (1) and is connected to at least one working line (A, B), and a second pressure chamber (7), which adjoins the first control piston (1) and is pushed against a stop (3) by a first preloading spring (4). A throttle (8) connects the first pressure chamber (6) and the second pressure chamber (7). The second pressure chamber (7) is connected to a second control piston (11), which is preloaded by a second preloading spring (17) and which, when a predetermined pressure in the second pressure chamber (7) is exceeded, is displaced to an extent such that a control edge (12) of the second control piston (11) clears a connection of the second pressure chamber (7) to a hydraulic fluid discharge point (23).

Abstract: A safety valve for swimming pools that senses and then instantly relieves excessively high vacuum levels in the pool's drain line. Such high vacuum levels occur when an individual becomes trapped by the suction at the pool's drain port which is connected to the drain line. The valve relieves the high vacuum level in the pool's drain line and the suction at the drain port by bleeding air into the pool's drain line, causing the pump connected to the drain line to lose prime. The valve is equipped with means for adjusting the vacuum level at which it actuates to accommodate varying vacuum levels found at different pools.

Abstract: The subject invention is a valve for regulating the viscosity of fluid utilized by an integrated drive generator (IDG). The valve includes a housing defining a bore having a first inlet supplying “cold” hydraulic fluid at a first viscosity and a second inlet supplying “hot” hydraulic fluid at a second viscosity. A spool valve disposed within the bore has at least one land to proportionally control the flow of hydraulic fluid through the inlets. Hydraulic fluid from the first and second inlets mixes within the valve and exits the valve through an outlet at an optimum viscosity for the operation of the IDG. A flow restrictor creates a pressure force on the spool valve that is proportional to the viscosity of the hydraulic fluid flowing to the IDG.

Abstract: Assemblies for control of fluid flow are described. The assemblies permit angular adjustment of resilient biasing mechanisms through translation of one of their ends along the assembly exteriors. Although the resilient mechanisms normally facilitate covering a bypass inlet so as to close it with a flap, the mechanisms may be latched with the bypass inlet open.

Abstract: Assemblies for control of fluid flow are described. The assemblies permit angular adjustment of resilient biasing mechanisms through translation of one of their ends along the assembly exteriors. Although the resilient mechanisms normally facilitate covering a bypass inlet so as to close it with a flap, the mechanisms may be latched with the bypass inlet open.

Abstract: A gray-water recycling system for reclaiming gray-water for use in toilets and lawn care. The system includes a reservoir adapted to treat gray-water and includes an intake pipe, an outlet pipe and an overflow pipe. An inlet coupled to the intake pipe supplies gray-water to the reservoir. A filter is fluidly coupled to the outlet pipe for filtering gray-water to define processed gray-water. A pump is fluidly coupled to the by a pipe. A first valve (24) controls flow of the processed gray-water from the pump. The first valve is fluidly coupled to the pump, a fresh water inlet and a processed gray-water outlet. The first valve is adapted to open the fresh water if the water pressure from the processed gray-water falls. Also included is a pressure valve (52) adapted to manually adjust the pressure of the processed gray-water outlet and to allow a flow of fresh water in the event the solenoid of the first valve fails to operate.

Abstract: A bleed valve for introducing bled fluid to a mainstream fluid flowing through apparatus across which a pressure differential occurs, characterized in that the bleed valve is adapted to open so as to bleed fluid into the mainstream fluid when the pressure differential across the apparatus falls below a predetermined value. This arrangement is particularly appropriate to vacuum cleaners incorporating cyclonic dust-separating apparatus in that the bleed valve is more reliably operated in response to a reduction in airflow. This ensures efficient functioning of the cyclonic dust-separating apparatus and reduces the risk of overheating of the motor.

Abstract: The air (atmospheric air) is introduced from an atmospheric port, and it is throttled to give a minute amount by means of a bleed hole. The air is introduced into a vacuum chamber via a bleed passage, and it is introduced into a pressure regulator port via a feedback passage. Further, the air is allowed to pass through a space between a seat section and a seal member of a valve plug, and it is drawn toward a vacuum port. Thus, the seal member of the valve plug to be seated on the seat section is prevented from biting into the seat section.

Abstract: A flow controller is provided for use with a pool cleaner, particularly of the type powered by a suction or vacuum source via a flexible vacuum hose or the like connected to the suction side of conventional pool water filtration equipment, wherein the flow controller maintains the suction pressure applied to the pool cleaner at a substantially constant and adjustably preset level consistent with substantially optimized pool cleaner operation. The flow controller comprises a generally tubular housing mounted at a location submerged within the pool water, preferably by installation in-line along the vacuum hose coupled to the pool cleaner. The flow controller includes a pivotally mounted flap valve biased by a spring for normally closing a bypass relief port. The flap valve is drawn by suction pressure toward a modulated open position to prevent the suction pressure from exceeding a preset threshold level.

Abstract: A switchover device for providing a continuous supply of a gas such as chlorine to a water system. The switchover device includes an outlet in communication with a chamber as well as with a vacuum source and two inlets also in communication with the chamber. The switchover device further contains a shuttle that may be positioned to isolate the first inlet, the second inlet, or neither inlet.

Abstract: An automatically-locking bypass valve (10) of the type including a valve body (12), an inner member (11) in sliding engagement with the valve body (12) and having a bypass opening (48), the valve body (12) and inner member (11) having first and second vacuum-reactive surfaces (18a and 18b respectively), and a spring (60) between the valve body (12) and the inner member (11) against which the vacuum-reactive surfaces (18a and 18b respectively) move axially relative to each other. The valve body (12) has a guide (26) and the inner member (11) has a guide-follower (50) which is (a) slidably engaged with the guide (26) in one rotational alignment with the valve body (12) in a normal operating range of relative axial positions of the valve body (12) and inner member (11) and (b) out of sliding engagement with the guide (26) beyond such normal operating range.

Abstract: A gas feed system for supplying a gas such as chlorine to a water system for chlorinating the water. The gas feed system includes multiple containers and provides for automatic switch over from one container to a second container once the first container is empty and such that the first containers can be completely emptied. The invention also includes a gas feed regulator for controlling the supply of gas from a container such as a chlorine cylinder, the regulator having a simplified construction.

Abstract: A system allows pumps to run in parallel and preventing back flow through a non-operational pump. The system includes a first pump in parallel with a second pump. The system further includes a check valve in fluid communication with the first pump for preventing flow through the first pump when the first pump is not operating. The system further includes a sensing valve in fluid communication with the first pump and the second pump. The system also includes a load sharing valve in fluid communication with the check valve, the sensing valve, and the second pump for controlling a system flow, wherein the system flow is provided by the first pump when the second pump is not operating, and wherein the system flow is provided by the second pump when the first pump is not operating, and wherein the system flow includes a portion of flow from both the first and second pumps when both pumps are operational.

Abstract: A apparatus for use with an open center steering valve (3) of a hydraulic power-assisted steering unit of a motor vehicle. The apparatus comprises an electric motor operated pump (5) and a hydraulic accumulator (7) for storing a pressurized quantity of hydraulic fluid. The hydraulic accumulator (7) is hydraulically connected to the pump (5). The pump (5) supplies the pressurized hydraulic fluid to the hydraulic accumulator (7). The apparatus further comprises a valve arrangement (10) for controlling hydraulic fluid flow from the hydraulic accumulator (7). The valve arrangement (10) has a riser (25), a slide valve (19), a valve seat (21), and an electromagnet. The riser (25) is hydraulically connected to the pump (5). The valve seat (21) has an opening which hydraulically connects the riser (25) and the hydraulic accumulator (7).

Abstract: A method and apparatus is disclosed for controlling the pressure of a reaction chamber in wafer processing equipment. The disclosed apparatus and method uses a ballast port for inserting gas into the evacuation system, thereby controlling the pressure in the reaction chamber. The disclosed apparatus and method further uses estimation curves to estimate the desired position of a controlled gate valve which is located between the reaction chamber and turbo pump. The disclosed apparatus and method achieves a set point pressure by prepositioning a throttle valve followed by repositioning the throttle valve based on the difference between a measure pressure and the set point pressure using proportional and integral control, wherein enablement of integral control is delay for a pre-specified period.

Abstract: A flow control apparatus for regulating the flow of hot and cold water through a mixing valve and for preventing undiluted hot water from being inadvertently delivered to a common outlet includes a common chamber and a pair of diaphragm valves on opposite sides of the common chamber. It also includes a check valve in the common chamber for opening and closing the diaphragm valves. Conventional piping, preferably flexible piping is used to connect the mixing valve to a source of hot water and to a source of cold water. The diaphragm valves and check valve are connected and arranged to prevent the flow of hot water through the mixing valve in the absence of a flow of cold water. The flow control apparatus may also include a mechanism for overriding the mixing valve in order to deliver an undiluted flow of hot water to the common outlet.

Abstract: A gas feed system is disclosed for supplying a gas such as chlorine to a water system for chlorinating the water. The gas feed system includes multiple containers and provides for automatic switching over from one container to a second container once the first container is empty and such that the first container can be completely emptied. The invention also includes a gas feed regulator for controlling the supply of gas from a container such as a chlorine cylinder, the regulator having a simplified construction.

Abstract: This invention relates to a gas motor fuel delivery system having a gas mixer, which has a through passage having a gas mixing zone in which there is a suction dependent on the flow velocity prevailing there. The through passage of the gas mixer is part of a lean-gas line (2). Rich gas is delivered to the gas mixing zone of the gas mixer and admixed with the lean qas to raise the heating value of the latter to a value suitable for the motor.

Abstract: An airflow rate regulating device which is installed in a vacuum unit that collects contaminants from a processing station in a controlled space. This device enables a vacuum unit to maintain a continuous suction of contaminant particles from a processing station when there are pressure variations in the controlled space. The airflow rate regulating device is mounted in a suitable cabinet 88 and connected to a vacuum source. The airflow rate regulating device has a casing divided into two chambers separated by a wall having an passageway through which air flows from one chamber to the next. Each chamber features an airflow rate regulation valve comprising a movable member extending across the flow of air passing through the casing, that can be adjusted using counterweights.

Abstract: A system and method for dispensing a fuel derived from one or more fuels having different octane ratings respectively stored in a plurality of storage tanks. The fuels are passed from their respective tanks to a mixing zone for mixing to form a blended fuel. The blended fuel is passed from the mixing zone to a dispensing nozzle while the octane rating of the blended fuel is sensed. The flow of each fuel from its tanks to the mixing zone is controlled accordingly to establish and maintain a predetermined octane rating of the blended fuel.

Abstract: A pair of plastic containers are compressed intermediate a pair of jaws and RF energy is applied as a function of the change in impedance of the melting plastic between the jaws to sterilize with heat the plastic intermediate the pair of jaws and to form a sterile rupturable membrane encircled by a seal to permit fluid communication on demand between the containers upon rupture of the membrane. The use of RF energy to heat bipolar plastic material (dielectric material) both sterilizes the plastic material and welds the plastic material at a proper temperature to form the rupturable membrane without the use of any instrumentation indicative of temperature or other control parameters.

Abstract: A relief valve for use with automatic suction operated swimming pool cleaners which has a tubular body and a bypass passage into the body inclined at an acute angle to the inlet and controlled by a closure pivotally supported about an end upstream of the normal flow direction through the valve and with the closure biased, preferably by at least one tension spring, to the closed position.

Abstract: A device for automatic dilution of chemical additives and water utilizing a single pump (20) drawing water and other chemical additives through a dilution manifold (10). The introduction of air into the system is monitored such that the system performance is not impaired. If the air leak is small corrections can be made or the system will accept the small error, but if the air leak is large, the system will shut down and activate an indication or alarm to signify that some malfunction has occurred, such as a chemical supply being unconnected or empty.

Abstract: An installation for lubricating, cleaning and/or disinfecting conveyor belts for containers, more particularly for foods, such as bottles, glasses, cans, bags and the like, comprising a central metering station connectable to a water pipe used to dilute a concentrated lubricant, cleaner or disinfectant, and several distributing pipes connected to the metering station lead to the points of use. At each point of use there is a mixing valve (13-19) connectable to distribution line (52) and the water pipe (23) and individually adjustable for each point of use and a pressure reducer (50, 51) fitted upstream of each mixing valve. Varying concentration can be provided for each point of use (31-37) with little technical complexity. In another embodiment, the invention is the process carried out by the installation.

Abstract: The invention is directed to a process for providing a gas having a minimum pressure and a composition that includes a major component to an end application, said process comprising the following steps:a) providing a first gas having said major component in a first concentration to said end application;b) providing means for measuring the pressure of said first gas being delivered to said end application;c) providing a second gas having a second concentration of said major component of said first gas which exceeds said first concentration;d) providing a third gas having a third concentration of said major component of said first gas which is less than said first concentration;e) providing means for mixing said second and said third gases so as to produce a fourth gas at at least said minimum pressure and which has said major component in a fourth concentration; wherein,f) when said means for measuring the pressure of said first gas to be received at said end application detects a deficiency with respect to sa

Abstract: A pressure reduction valve for reducing the pressure in double-acting, closed hydraulic systems when they are not attended. The valve comprises a valve housing (1) with a boring (6), whose ends communicate with the respective circuits, and wherein there are provided two slide valves (21, 22), which are attempted to be forced away from each other by a spring device (39). Each slide valve (21, 22) has a seat (28, 29) for a valve body (31, 32) which is influenced by springs (37, 38) which are also arranged to move the slide valves (21, 22) towards each other. Between the valve bodies (31, 32) there extends slidably a rod (40), whose ends can influence the valve bodies, and whose length is adapted to the slide valves (21, 22) possible distances of movement, thus enabling it to bring the valve bodies alternately away from their seats when the slide valves are forced towards each other under the influence of the pressures in the respective hydraulic circuits.

Abstract: Systems and methods for pressure reduction, including a first conduit with a pressure sensor, a static restriction device, and second conduit connected therebetween. Fluid is introduced through the second conduit as a function of the pressure sensed by the pressure sensor, thereby compensating for fluctuations in sensed pressures due to restriction device degradation and other factors.

Abstract: A device for ensuring the safety of the oxygen and gas supply to a welding and cutting torch (4). The object of the device is to prevent accidental escape of oxygen and/or gas when the torch is not in use. For this purpose, the device is characterized in that the oxygen supply line and the gas supply line each contain a controlled regulating valve (10, 12), which valves are connected to a common control line (14). The oxygen supply line, downstream of the regulating valve (12), viewed in the direction of flow of the oxygen, contains a starting tank (20), and a flow-pressure switch (21) which operates a regulating slide valve (16) accommodated in the control line, said control line being in communication by way of the regulating slide valve and a line (30) with the part of the oxygen supply line situated upstream of said regulating valve (12).The invention is also embodied in a flow-pressure switch, which is suitable in particular for use in the above device.