Abstract: A dispensing device for dispensing anesthetic in a breathing gas stream includes a flow duct (42) for an anesthetic-containing breathing gas stream, a control unit (5) and a first temperature sensor (54). An anesthetic feed device (45) has an evaporation surface (46) arranged in the flow duct (42). The first temperature sensor (54) detects the temperature of the evaporation surface (46) and sends a first temperature signal (T1) to the control unit (5). A second temperature sensor (53) detects the temperature of the breathing gas stream in the flow duct (42) and sends a second temperature signal (T2) to the control unit (5). The control unit (5) is configured to determine an anesthetic concentration based on the first and second temperature signals (T1, T2).

Abstract: The turbine exhaust case can have an outer shroud, an inner shroud internal to the outer shroud, an annular exhaust path between the outer shroud and the inner shroud, and a plurality of struts each having a length extending across the annular exhaust path from a radially inner end to a radially outer end, the struts circumferentially interspaced from one another, the struts each having a leading edge and a trailing edge, a stiff connection between the radially inner end and the inner shroud, and a point connection between the radially outer end and the outer shroud.

Abstract: A pipeline strainer is provided having a cavity, a screen assembly disposed in the cavity, the screen assembly having an open first end and an open second end and a screen axis extending from the open first end to the open second end, a fluid inlet arranged at the open first end of the screen assembly, such that the fluid inlet is open to an interior of the screen assembly, a fluid outlet adjacent the open first end of the screen assembly. The fluid outlet is open to a straining surface of the screen assembly. A fluid axis extends from the fluid inlet to the fluid outlet where the fluid axis crosses the screen axis at or near the fluid inlet.

Abstract: A refrigeration cycle apparatus includes a first refrigerant circuit including a first compressor, a first heat exchanger, a first refrigerant flow path of a second heat exchanger, a first expansion device, a third heat exchanger, and a second refrigerant flow path of a fourth heat exchanger, and a second refrigerant circuit including a second compressor, a fifth heat exchanger, a second expansion device, a third refrigerant flow path of the second heat exchanger, and a fourth refrigerant flow path of the fourth heat exchanger, a first refrigerant flows through, in order, the first compressor, the first heat exchanger, the first refrigerant flow path, the first expansion device, the third heat exchanger, and the second refrigerant flow path, the second refrigerant flows through, in order, the second compressor, the fifth heat exchanger, the second expansion device, the third refrigerant flow path, and the fourth refrigerant flow path.

Abstract: The invention relates to a propelling nozzle for a turbofan engine on a supersonic aircraft, the propelling nozzle including: a propelling nozzle wall, a duct, which is radially outwardly bounded by the propelling nozzle wall, and a central body arranged in the duct. According to the invention, the central body is connected to the propelling nozzle wall via at least one brace.

Abstract: A compressor suction pipe includes a bent portion at least including a first pipe segment on the most upstream side with respect to flow of a fluid to be compressed, a second pipe segment connected to a suction side of a compressor and extending in a direction different from the extension direction of the first pipe segment, and a third pipe segment disposed between the first pipe segment and the second pipe segment and extending in a direction different from the extension directions of the first and second pipe segments, and at least one partition extending at least from an intermediate portion of the first pipe segment at least to an intermediate portion of the second pipe segment in the bent portion and dividing an interior of the bent portion. The partition extends in a direction intersecting a virtual plane including an incircle that touches an axis of the first pipe segment on an upstream side of a downstream end of the first pipe segment and touches an axis of the second pipe segment.

Abstract: An apparatus for the separation or liquefaction of a gas at cryogenic temperatures which comprises an isolated chamber comprises at least one front distillation column operating at cryogenic temperatures and also a pipe for transferring fluid coming from or going to the column, the pipe having a diameter D comprising a bend for changing the direction of flow of the fluid, with profiled deflector vanes placed inside the bend, with their concavity towards the centre of the bend forming a plurality of ducts.

Abstract: Modular flow control systems include several differently-shaped structures to achieve desired flow characteristics in fluid flow. Systems include one or many plates held in desired positions by a retainer within the flow. The plates are uniquely shaped based on their position, or vice versa, to shape flow in a desired manner. The plates may fill an entire flow area or may extend partially throughout the area. Plates can take on any shape and are useable in systems installed in any type of flow conduit. When used in a PCCS upper manifold in a nuclear reactor, a chevron plate directly below the inlet divides flow along the entire upper manifold. Perforated plates allow flow to pass at ends of the PCCS upper manifold. The plates can be installed along a grooved edge during an access period and held in static position by filling the length of the PCCS upper manifold.

Abstract: An air-conditioning system that performs a refrigeration cycle in a refrigerant circuit, includes: an outdoor unit; a plurality of indoor units; and a connection pipe disposed between the outdoor unit and the indoor units and that forms at least a refrigerant passage through which refrigerant in a gas-liquid two-phase state flows. The connection pipe includes: a branch portion that includes an indoor-side pipe group including indoor-side pipes that each communicates with any one of the indoor units, and diverges refrigerant flowing from the outdoor unit side; and a trap portion disposed in at least any one of the indoor-side pipes and is filled with refrigerant in a gas state.

Abstract: A fuel nozzle assembly and a gas turbine having the fuel nozzle assembly includes a fuel nozzle guide disposed in a compressed air channel formed between a body and a housing of a gas turbine and includes a nozzle body disposed in the housing, a shroud mounted on an outer side of the nozzle body, and two or more flow guides arranged at predetermined distances from each other between the shroud and the outer side of the nozzle body and formed to correspond to the shape of an end of the shroud and the shape of the outer surface of the nozzle body.

Abstract: A flow conditioning assembly comprising an integral elbow flow conditioner and a downstream flow conditioner. The elbow flow conditioner includes a pipe elbow with one or more flow conditioning elements. Each flow conditioning element includes one or more turning guides. Each turning guide is generally circular and radially spaced from one another and an inner surface of the elbow. Spaced vanes maintain the radial spacing of the turning guides. The vanes divide the radial space between the turning guides and pipe elbow into a plurality of flow channels that turn in generally the same direction as the inner surface of the pipe elbow. The downstream flow conditioner comprises a flow conditioning structure within a pipe element. The flow conditioning structure includes one or more flow guides of generally circular form radially spaced from one another and the pipe element. Spaced support vanes maintain the radial spacing of the flow guides.

Abstract: A component assembly for a gas turbine engine having a combustor and defining a core air flowpath includes a first wall and a second wall. The first wall is configured for at least partially defining the core air flowpath at a location downstream of a combustion chamber defined by the combustor of the gas turbine engine. Additionally, the second wall is also configured for at least partially defining the core air flowpath at a location downstream of the combustion chamber, and is located opposite the core air flowpath of the first wall. The second wall includes a plurality of fins extending towards the first wall along the radial direction and spaced along the circumferential direction.

Abstract: A gas turbine engine component includes a static component with at least one first flow channel. The labyrinth seal rotates relative to the static component. The labyrinth seal is spaced from the static component by a second flow channel. The flow passing between the labyrinth seal and the static component will have a first portion that travels through the at least one first flow channel and a second portion that travels through the second flow channel with the first portion of the flow being reintroduced into the second flow channel to create a flow restriction.

Abstract: The animal repellent canister is a chemical dispenser. The animal repellent canister is configured for use in driving away nuisance animals (hereinafter pests). The animal repellent canister stores and dispenses a repellent material known to repel pests. The animal repellent canister dispenses the repellent material in a gas phase. The animal repellent canister contains the repellent material in a water impermeable structure such that precipitation will not wash away the repellent material. The animal repellent canister comprises a dispenser, a ground anchor, and the repellent material. The dispenser contains the repellent material in a phase selected from the group consisting of a liquid phase and a solid phase. The dispenser releases the repellent material in a gas phase. The ground anchor anchors the dispenser to the ground such that the dispenser is elevated above the ground.

Abstract: The present invention relates to an exhaust system for a combustion engine of a marine vessel. The exhaust system includes an exhaust system inlet configured to be coupled to an exhaust gas outlet of the marine engine, one or more exhaust system outlets, and an exhaust gas flow path extending from the inlet to the one or more exhaust system outlets and having a forward flow direction from the exhaust system inlet and a reverse flow direction extending from at least one of the one or more exhaust system outlets. The exhaust system further includes a flow redirection arrangement in the exhaust gas flow path for restricting a flow of liquid flowing in the reverse flow direction, the flow redirection arrangement comprising at least one flow redirection feature configured to redirect a first stream of the liquid toward the forward flow direction to collide with a second stream of the flow of liquid. The invention also relates to motor assemblies and marine vessels having such exhaust systems.

Abstract: A baffle apparatus for improving a flow deviation of a fluid due to the enlargement of a flow cross-section of the fluid including a plurality of baffle members. Each of the plurality of baffle members has a first part into which the fluid enters and a second part from which the fluid flows out, the first part and the second part are integrated, the first part of each of the plurality of baffle members is at a position where the flow cross-section of the fluid is enlarged and the second part of each of the plurality of baffle members is at the position where the flow cross-section of the fluid is constant, and ends of the first parts are spaced apart from each other by a distance satisfying the equation: d i = D f ? ( i ) ? ? i = 1 n ? 1 f ? ( i ) , and the second parts are spaced apart from each other by a uniform distance.

Abstract: A cavitation apparatus capable of performing multiple, different-type cavitation processes taking place simultaneously in the same geometric space, thereby obtaining an effective cavitation process that is significantly faster than those provided by conventional cavitation apparatus. The cavitation apparatus can include consecutive and/or simultaneous cavitation units which are configured to carry out consecutive and/or simultaneous cavitation processes on a material flowing through the apparatus, such that effects of one or more prior cavitation processes are present in the material while the material is subjected to one or more further cavitation processes within the apparatus, enhancing the cavitation effects in a reduced amount of time and increasing productivity of the apparatus. In some embodiments, the apparatus can perform seven cavitation processes, of four different types.

Abstract: The invention includes components and methodology for fixed and semi-fixed systems for extinguishing fire in large industrial flammable liquid storage tanks, including aerated foam projecting nozzles discharging substantially focused streams together with aeration chambers and risers and the formation of wand heads and wands.

Abstract: A heat exchanger system includes an additively manufactured inlet header upstream of, and in fluid communication with, the heat exchanger core and an additively manufactured exit header downstream of, and in fluid communication with, the heat exchanger core. A method of manufacturing a header for a ducted heat exchanger system for a gas turbine engine includes additively manufacturing a header with respect to a desired airflow therethrough.

Abstract: A flow balancer to reduce turbulence and achieve a laminar water flow system for fish while being pumped. The flow balancer having a tubular guide for the fish made from spaced apart blades having a width greater than a thickness of the spaced blades forming the tubular guide. The tubular guide is constructed and arranged to prevent turbulent and non-parallel water flow and allow fish to pass in a laminar water flow.

Abstract: A micromixer of a gas turbine has a plurality of tubes each having an inlet and an outlet for receiving a flow and dispersing the flow to a combustor. At least some of the tubes have a liquid fuel injector, and the liquid fuel injector projects into one of the tubes. The liquid fuel injector has a ramped upstream surface and two converging side surfaces. The ramped upstream surface compresses the flow passing thereover, and a top surface of the liquid fuel injector comprises a liquid fuel outlet.

Abstract: Thin film resonators are deployed in the port ducts of speakers, musical instruments, microphones, and other devices having an important auditory component, to reduce distortion and/or improve other sound qualities. Preferred resonators have a resonator sheet with a first air cavity, and a passageway in an edge of the resonator sheet that opens to the air cavity. The cavity is further defined by a cover sheet, and preferably also a base sheet. The sheets are preferably bonded together by an adhesive. Resonators can be deployed rolled up inside a duct, slightly curved, or laying substantially flat on a surface over which air is flowing. Resonators can be deployed during and/or post manufacturing. Cavities are preferably elliptically shaped, and deployed as substantially mirror image pairs. Openings to the cavities can be positioned on one or more edges of the resonators.

Abstract: Embodiments of the present disclosure include a multi-inlet fracturing head (MIFH) having a first inlet channel extending through a body of the MIFH, the first inlet channel being substantially perpendicular to an axis of the MIFH and directing fluid into a first flow passage of the MIFH. The MIFH also includes a second inlet channel extending through the body of the MIFH, the second inlet channel being at an angle relative to the axis and directing fluid into the first flow passage of the MIFH.

Abstract: An airflow baffle for controlling airflow through a heating, ventilation, and air conditioning (HVAC) system. The airflow baffle includes a main body, an upstream side of the main body, and a downstream side of the main body. A plurality of holes are defined by the main body, and extend through the main body between the upstream side and the downstream side. The plurality of holes include holes of various different diameters spaced apart at various different intervals to provide uniform airflow through the baffle.

Abstract: A diffuser for a gas turbine engine is provided that includes an outer shroud, an inner shroud, a multiple of struts between said outer shroud and said inner shroud to define an annular flow path, and a mid-span pre-diffuser inlet in communication with said annular flow path.

Abstract: A refrigerating appliance includes an evaporator for providing cooled air to a refrigerating compartment. An air tower defines an air channel for directing the cooled air from the evaporator to the refrigerating compartment. A plurality of air-directing guide vanes is positioned within the air tower and proximate a top of the air channel. The air directing guide vanes direct the cooled air from the air channel to define redirected air that is delivered in a direction toward an upper cool-air slot defined within the air tower. The redirected air from the air-directing guide vanes travels through the upper cool-air slot at substantially the same velocity as the cooled air entering the air-directing guide vanes. The redirected air is directed through the upper cool-air slot and toward at least one upper corner of the refrigerating compartment.

Abstract: A vortex suppression element is configured to be inserted in a pipe joint between pipe segments for mitigation of erosion from particulate laden fluid flowing in at least one of the pipe segments. The vortex suppression element includes an outer ring, and an array of inner axial vanes secured to the outer ring. A method of using the vortex suppression element includes locating, in the pipeline, a pipe joint at a location where a vortex would form in the particulate laden fluid flowing in the pipeline in the absence of a vortex suppression element in the pipe joint in the pipeline; and inserting the vortex suppression element in the located pipe joint in the pipeline.

Abstract: A compressor diffuser for a gas turbine engine includes one or more diffuser pipes having a tubular body defining an internal flow passage extending therethrough. The tubular body includes a first portion extending in a first direction, a second portion extending in a second direction different from the first direction, and a curved portion fluidly linking the first portion and the second portion. A splitter vane is disposed within the internal flow passage of the curved portion of the tubular body, the splitter vane defining a convergent flow passage between itself and a radially inner wall of the curved portion.

Abstract: A device is illustrated and described for altering the jet shape of pourable products, in particular of foodstuffs, including an entry region for the entry of the pourable products, an exit region for the exit of the pourable products, and several ducts for conveying the pourable products, wherein each duct has at least one inlet associated with the entry region and at least one outlet associated with the exit region. The use of this device for the filling of foodstuffs and a method for the production of this device are also illustrated and described. In order to achieve that the shape and the velocity profile of the filling jet can be adjusted simply and gently, it is proposed that at least one of the ducts is curved, at least in sections.

Abstract: An apparatus and method are provided for a drone elimination muffler to attenuate drone exhibited by engine exhaust systems. The drone elimination muffler comprises a hollow canister having a length and a diameter, and a tuned port comprising a first end connected to the canister and a second end connected to the exhaust system. The canister operates in concert with the tuned port as a dampener configured to substantially attenuate exhaust drone, or resonance, at one or more frequencies of engine operation. A valve is configured to switch the drone elimination muffler between a closed state in which the exhaust system operates without acoustic influence due to the drone elimination muffler, and an open state in which the drone elimination muffler directly influences the acoustic properties of the exhaust system.

Abstract: In a method of manufacturing objects, extrudable ceramic forming material is extruded through multiple dies arrayed around an extrusion axis, the dies mounted to permit controlled movement of the dies during the course of extrusion to vary the position of several extrudate streams exiting the dies. Extruded objects are defined by spokes corresponding to the extrudate streams with the streams having a varying spacing from a central axis.

Abstract: The present application relates generally to a demonstration kit for various nozzles. The demonstration kit may include a spray assembly and a control assembly. The spray assembly may include a case having a base and a cover rotatably coupled to the base, a plurality of back wall panels configured to be secured to a sidewall of the base, a boom connected to an interior surface of the case, and one or more nozzles connected to the boom and repositionable along a length of the boom. The control assembly includes at least one pump that when in an operating orientation is fluidly connected to the one or more nozzles and a portable power supply in electrical communication with the at least one pump.

Abstract: Embodiments described herein relate to firefighting foam generators. The generators may include a receptacle for receiving liquid. A gas supply may be provided for supplying gas into the liquid to create foam. At least one turbulence creator may be provided for creating turbulence in the receptacle. Advantageously, the firefighting foam generators create turbulence to assist with mixing the gas and liquid when creating the foam. The embodiments provide for improved mixing and evenness of foam, without foam flooding, when compared with known foam generators. The embodiments are also simple to manufacture when compared with known foam generators.

Abstract: A duct structure including a fin having a downstream end surface extending between an inner surface of a duct and a downstream end of a top surface of the fin in a height direction of the fin. As a result, a vortex can be intentionally generated in a downstream of the downstream end surface of the fin. Since a pressure in the vortex is lower than a pressure in a surrounding portion of the vortex, the vortex can draw a fluid flow having flowed along the top surface of the fin to the vortex and can change the flow to a flow flowing along a portion of the inner surface of the duct located downstream of the fin. As a result, a flow separation from the inner surface of the duct can be suppressed.

Abstract: An apparatus for contaminant reduction in a stream of compressed gas is disclosed. The apparatus includes an insert for directing the gas. The insert sits in a head portion which has an inlet leading to an inlet pathway for directing the gas towards the insert. The head portion also has an outlet leading from an outlet pathway for directing the gas from the insert towards the outlet. There is also a body portion sealed to the head portion for collecting contaminants removed from the gas. The insert includes a tubular portion connected to the head portion. Gas from the inlet pathway passes outside the tubular portion while gas going to the outlet passes inside the tubular portion. The insert has a baffle extending from the tubular portion for narrowing the gap between the insert and the body portion and has curved walls extending from the baffle causing the stream of gas to rotate thereby form a vortex.

Abstract: Apparatus and methods are provided for extracting compounds from raw materials. One such apparatus may include an extraction column where it is a one column, one pass design capable of withstanding high temperatures and pressure. Additionally, the extraction column may also be capable of containing a self-perpetuating energy cycle used to achieve the required solubilization and mass transfer temperatures necessary for optimal extraction. The apparatus may also include a first opening and a second opening to control the flow of incoming solvent and filter extraneous sediment trapped within the fully extracted effluent. Additionally, the apparatus may be configured to create a self-perpetuating and self-sustaining energy cycle by manipulating the pressure and temperature generated within the apparatus.

Abstract: There is disclosed a drainage apparatus capable of allowing the fluid flowing via diverse paths to flow via one path, the drainage apparatus comprising a first inlet pipe fluid flows in, a second inlet pipe fluid flows in, an outlet pipe in communication with the first inlet pipe and the second inlet pipe, a first outlet hole in contact with the first inlet pipe and the outlet pipe and a second outlet hole in contact with the second inlet pipe and the outlet pipe, wherein the first outlet hole and the second outlet hole are provided not to face each other directly.

Abstract: A flow conditioner comprising a perforated plate with a central hole and four or more circular paths, which are arranged radially from the central hole and concentrically with one another, wherein holes are arranged on these concentric circular paths, characterized in that a preponderate number of holes of an intermediate circular path have a greater hole diameter than a preponderate number of holes of the innermost and a preponderate number of holes of the outermost circular paths.

Abstract: A method of applying a riblet structure coating on the internal surface of a pipe includes coating the internal surface of a pipe with a resin layer and applying a cavity mold having a reverse riblet pattern structure to the coated internal surface of the pipe. A flexible air bag is inserted into the interior of the pipe and charged with air to hold the mold against the coated internal surface of the pipe. The air bag may be charged with air for a sufficient amount of time to allow the coating to cure in the riblet shape of the mold. Afterwards, the air bag and the mold are removed from the pipe to yield a pipe coated with an internal riblet structure.

Abstract: A flow conditioner for use in a conduit includes a ring having a plurality of stepped elements disposed on an inner surface of the ring. A method for conditioning fluid using a flow conditioner includes coupling a flow conditioner to an interior surface of a conduit, flowing fluid through the conduit, contacting a surface of the flow conditioner with the flowing fluid, positioning a flow meter downstream of the flow conditioner, and measuring the flow profile of the fluid with the flow meter. Contacting the flow conditioner reduces one or more disturbances in a flow profile of the fluid. A flow conditioner includes a ring having at least one of a stepped element formed on an inner surface of the ring or a fin assembly coupled to the ring.

Abstract: The invention includes components and methodology for fixed and semi-fixed systems for extinguishing fire in large industrial flammable liquid storage tanks, including aerated foam projecting nozzles discharging substantially focused streams together with aeration chambers and risers and the formation of wand heads and wands. Specifically, the invention includes a nozzle having a tip portion, the tip portion having a stream shaper, and the stream shaper having at least four fins with a longitudinal dimension in the tip portion greater than a radial dimension in the tip portion.

Abstract: A new method for generating micro-nano bubbles that uses water hammering, a bubble generating nozzle, and an apparatus for generating micro-nano bubbles are provided to construct a system. The system is for generating micro-nano bubbles in a large amount using only pure water, which does not include any nucleating agents, and for performing not only a clean washing and sterilization but also the generation of uncontaminated micro-nano bubbles. The method defined in the present invention uses water hammering power produced by a mutual collision of jets of dissolved-gas-including solution squirted from two or more spouts.

Abstract: Embodiments of the present disclosure include a multi-inlet fracturing head (MIFH) having a first inlet channel extending through a body of the MIFH, the first inlet channel being substantially perpendicular to an axis of the MIFH and directing fluid into a first flow passage of the MIFH. The MIFH also includes a second inlet channel extending through the body of the MIFH, the second inlet channel being at an angle relative to the axis and directing fluid into the first flow passage of the MIFH.

Abstract: An apparatus (10) for generating nanobubbles for use with fluid dispensing fittings is described. The apparatus includes a longitudinal shaft having a first end portion (12), a body (16) and a second end portion (14). The first end portion (12) and the second end portion (14) are adapted for connection with the body (16). The first end portion (12) and the second end portion (14) each includes a conical-shaped guide wherein the body comprises airfoil-shaped projecting members (19) arranged circumferentially on the outer circumferential surface of the body (16).

Abstract: A respiratory treatment apparatus configured to provide a flow of breathable gas to a patient, including a breathable air outlet, an outside air inlet, and an pneumatic block module, wherein the pneumatic block module includes: a volute assembly including an inlet air passage, a mount for a blower and an outlet air passage; the blower being mounted in the mount such that an impeller of the blower is in a flow passage connecting the inlet air passage and the outlet air passage; a casing enclosing the volute assembly, wherein air passages within the casing connect air ports on the volute assembly, wherein the inlet air passage of the volute assembly is in fluid communication with the outside air inlet and the outlet air passage of the volute assembly is in fluid communication with the air outlet.

Abstract: A method and apparatus for a deposition solution injector for a nuclear reactor that may inject an ambient temperature deposition solution into a high temperature, high pressure feed-water flow line. The method and the apparatus ensures that the deposition solution is delivered in a location within the feed-water that is beyond a boundary layer of flowing water, to prevent smearing of the solution and prevent clogging of the deposition solution within the injector. The axial cross-sectional profile of the injector, and the location of an injection slot on the injector, may reduce vortex eddy flow of the feed-water into the injector to further reduce injector blockage.

Abstract: A motive air conditioning system for a gas turbine assembly is provided. The motive air conditioning system may include an inlet flow channel configured to be fluidly coupled with the gas turbine assembly. The motive air conditioning system may also include a filtration assembly fluidly coupled with the inlet flow channel and configured to filter motive air. The filtration assembly may include a plurality of filter modules disposed adjacent one another and further disposed circumferentially about a longitudinal axis of the inlet flow channel.

Abstract: A gas turbine engine is disclosed having a working fluid system capable of moving a working fluid. The working fluid system includes a flow splitter capable of splitting the working fluid into different streams. In one form the flow splitter member is a T-shape, but other embodiments can take on other shapes. The flow splitter can include an internal scoop used to split the flow. In one form internal scoop is annular in shape and includes a turn to direct a split flow.

Abstract: A connection device comprising a body defining a channel having at least one tube end reception segment. Centering means for centering the tube end are arranged in a zone extending between the outer surface of the tube, a facing surface of the segment, and the sealing element. The centering means include positioning elements that are arranged to co-operate with a surface of the segment and with an outer surface of the tube and to define at least one sweeping duct for sweeping the zone, the duct having at least one inlet in the vicinity of which there extends at least one deflector arranged to insert, into the sweeping duct, fluid diverted from the flow traveling through the device, and at least one outlet for returning the fluid that has passed through the sweeping duct back to the flow.

Abstract: A pressure/vacuum relief system having one or more pressure relief/vacuum valve assemblies disposed within the controlled atmosphere room and a vent pipe to provide two-way fluid communication between the relief valve assembly and the outside environment. The relief valve assembly may be a split valve arrangement that includes a pressure valve that opens in response to positive pressure in the controlled atmosphere room and a vacuum valve that opens response to negative pressure in the controlled atmosphere room. The pressure and vacuum valves may be incorporated into a single valve body on opposite sides of a shared chamber that is coupled to the vent pipe. In one embodiment, the vent pipe is fitted through an external wall of the controlled atmosphere room.