Tech Exchange

Reseatable Pressure Relief Valve Fixes Leaks

Reclosable pressure-relief devices that employ a frusto-conical valve assembly or spherical valve assembly have been found to leak under vacuum. A new technology fixes leaks in low-pressure (less than 50 psi) relief valves. The invention adds a ring inside the valve. Both the valve seat and the sealing surface of the valve head are annular planar confronting surfaces oriented substantially perpendicular to the valve axis, and the resilient valve seal is an annular O-ring. To form a vacuum- tight seal, the O-ring is compressed between two planar mating surfaces by the valve spring. Pressure relief capacity is maintained, while providing a vacuum-tight seal during normal operation.

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Hydrogen Degassing System Features Ceramic Rotor

A system for degassing hydrogen uses silicon nitride ceramic rotors. The technology’s rotors stir molten aluminum and disperse the gas. By adding bubbles of an inert gas, hydrogen is drawn out from the metal, which otherwise would cause voids and substantially weaken castings.

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CV Number Enables Tunable Ball Valves

A ball valve for process systems has a field-adjustable CV number. The CV number allows the valve to be “tuned” for its system. The ball, controlled by an actuator, is moved 0–90 degrees. An adjustable V-port then adjusts the CV number.

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Safety Glass Offers Near-Infrared Heat Reflection

New safety glass technology reflects 50% of solar radiation and transmits 70% of visible light. A non-micellar twisted nematic liquid crystal features cholesteric near-infraredreflecting properties, along with at least one near-infrared absorptive material. The composition can be used as a layer — optionally in conjunction with polymeric films, polymeric sheets, and rigid sheets — to form multilayer laminates. The multilayer shields are useful as solar control windows to reduce energy consumption and cool the interior of automobiles or buildings.

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Microwave System Accelerates Concrete Curing

A Microwave Irradiated Pyrogen (MIP) system speeds up the concrete curing process. The use of a microwave allows the technology to operate in cold weather. Because the MIP accelerates the heating point, colder countries like Russia and Canada can use the curing system to build roads, tunnels, and other structures. The technology can also be used with precast concrete, mass concrete, and other construction needs.

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Multiple-Component Fibers Strengthen Non-Woven Fabric

A technology provides a full-surface, bonded, nonwoven fabric with a tensile strength suitable for packaging, bubble packs, and other applications requiring tear resistance. Fullwidth bonding, compared to the more common patterned point bonding, produces the high-strength fabric. The thin, low-cost material can be easily manufactured in smooth calendaring plants. Low voids reinforce the fabric.

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Microwave Energy Removes Fuel- Processing Impurities

A traditional sulfur-adsorption bed uses microwave energy to remove, or desorb, captured impurities. Conventional adsorption beds use heat and sometimes vacuum to cleanse the bed of sorbents; the process is energy-intensive and can reduce sorbent life. By using microwaves, the new technology desorbs the captured impurities from the bed with little or no change in temperature.

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