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safety valve |
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safety valve, device attached to a boiler boiler, device for generating steam. It consists of two principal parts: the furnace, which provides heat, usually by burning a fuel, and the boiler proper, a device in which the heat changes water into steam. ..... Click the link for more information. or other vessel for automatically relieving the pressure of steam before it becomes great enough to cause bursting. The common spring-loaded type is held closed by a spring designed to open the valve when the internal pressure reaches a point in excess of the calculated safe load of the boiler. Safety valves are installed on boilers according to strict safety regulations. safety valve a valve in a pressure vessel that allows fluid to escape when a predetermined level of pressure has been reached safety valve [′sāf·tē ‚valv] (mechanical engineering) A spring-loaded, pressure-actuated valve that allows steam to escape from a boiler at a pressure slightly above the safe working level of the boiler; fitted by law to all boilers. Also known as safety relief valve. Safety valve A relief valve set to open at a pressure safely below the bursting pressure of a container, such as a boiler or compressed air receiver. Typically, a disk is held against a seat by a spring; excessive pressure forces the disk open (see illustration). Construction is such that when the valve opens slightly, the opening force builds up to open it fully and to hold the valve open until the pressure drops a predetermined amount. This differential or blow-down pressure and the initial relieving pressure are adjustable. See Valve How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Safety Dennis Keyes will be UCLA's safety valve, dropping back when the Bruins keep their defense on the field. Consequently, Kotobuki-cho shifted from serving as a much-needed labour market safety valve, primarily in construction and dock work, to become a destination of last resort for elderly men divorced from family support, unable to find jobs, lacking material resources, and suffering social, physical and psychological handicaps. The melanch olic political philosopher with his tortured English is confined to a stationary van, while the cheerfully fluent porn translator is filmed on a clanking commuter train; a hard-pressed doctor bemoaning his hospital's antiquated equipment gives way to a soldier extolling the virtues of regular target practice as a psychosocial safety valve. |
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