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6201 results about "Relief valve" patented technology

A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure, or fire. The pressure is relieved by allowing the pressurised fluid to flow from an auxiliary passage out of the system. The relief valve is designed or set to open at a predetermined set pressure to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits. When the set pressure is exceeded, the relief valve becomes the "path of least resistance" as the valve is forced open and a portion of the fluid is diverted through the auxiliary route. The diverted fluid (liquid, gas or liquid–gas mixture) is usually routed through a piping system known as a flare header or relief header to a central, elevated gas flare where it is usually burned and the resulting combustion gases are released to the atmosphere. As the fluid is diverted, the pressure inside the vessel will stop rising. Once it reaches the valve's reseating pressure, the valve will close. The blowdown is usually stated as a percentage of set pressure and refers to how much the pressure needs to drop before the valve reseats. The blowdown can vary from roughly 2–20%, and some valves have adjustable blowdowns.

Inflatable sole lining for shoes and boots

There is disclosed an inflatable lining for selected inner surfaces of footwear, such as a shoe, boot or sandal. The inflatable lining is formed of first and second plastic sheets having the shape and size of the selected inner surfaces, e.g., a sole, or any portion of the upper surfaces of the footwear. The sheets are bonded together in a continuous seam about their peripheral edges thereby forming a sealed interior chamber. A plurality of discontinuous seams are formed between the first and second sheets to create within the sealed interior chamber a plurality of interconnecting tubular passageways, and at least one continuous seam can also be provided that subdivides the interior chamber into two or more subdivided interior chambers. The inflatable liner is provided with an air pump that preferably is a flexible bulb with an inlet valve which discharges into a flexible tube which extends to a pressure control valve and then to the interior chamber of the inflatable inner sole. Preferably the flexible bulb is mounted at the heel of the inner sole. The pressure relief valve is manually adjustable to control the pressure within the inflatable inner sole. Excess air from the pressure control valve can be directed into channels formed on the undersurface of the inner sole where it discharges through sealed apertures in the inner sole thereby providing forced air circulation in the footwear. Alternatively, manually operated air pumps can be provided.
Owner:LAKIC NIKOLA

Branched flow filtraction and system

A cross flow filtration apparatus for nanofiltration or reverse osmosis has pressure vessels with a plurality of filter cartridges in each vessel. A feed port is provided at an intermediate position on the side of the vessel, and two permeate flows or branches exit opposite ends of the vessel, and the first branch has a characteristically high “upstream” flux and quality, while the second is of lesser flux and/or quality. The system provides a high degree of moduarity, enhancing flux or yield at a reduced driving pressure or overall pressure drop. Centered or off-center port, and a stop or valve in the permeate stream may apportion flows between the two outlets. Staged systems may employ a first stage bypass to achieve a target quality with increased yield. A flow divider or adaptor permits the cartridges to fit and seal in the vessel and an installation tool or sleeve may facilitate installation or replacement of cartridges having a directional perimeter seal. A tool permits modules to be bi-directional installed in the pressure vessel. Other embodiments involve adapting a conventional vessel designed for end-to-end feed flow utilizing a restrictor, obstruction or valve inside the filter cartridge to bifurcate or otherwise split or apportion the permeate. RO elements may be modified to movably position an obstruction or valve along a string of the elements and vary the take-off to two or more permeate outlets, or to provide pressure relief valves that present different pressure conditions for different elements of a string. A pressure vessel may have an intermediate inlet, with symmetric or asymmetric branching of permeate flow to opposed ends of the vessel, enhancing permeate flux, permeate quality and/or energy efficiency.
Owner:IONICS INC
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