Safety valve
Safety chain Safety chain (a) (Railroads) A normally slack chain for preventing excessive movement between a truck and a car body in sluing. (b) An auxiliary watch chain, secured to the clothes, usually out of sight, to prevent stealing of the watch. (c) A chain of sheet metal links with an elongated hole through each broad end, made up by doubling the first link on itself, slipping the next link through and doubling, and so on. [Webster 1913 Suppl.]

{Safety arch} (Arch.), a discharging arch. See under {Discharge}, v. t.

{Safety belt}, a belt made of some buoyant material, or which is capable of being inflated, so as to enable a person to float in water; a life preserver.

{Safety buoy}, a buoy to enable a person to float in water; a safety belt.

{Safety cage} (Mach.), a cage for an elevator or mine lift, having appliances to prevent it from dropping if the lifting rope should break.

{Safety lamp}. (Mining) See under {Lamp}.

{Safety match}, a match which can be ignited only on a surface specially prepared for the purpose.

{Safety pin}, a pin made in the form of a clasp, with a guard covering its point so that it will not prick the wearer.

{Safety plug}. See {Fusible plug}, under {Fusible}.

{Safety switch}. See {Switch}.

{Safety touchdown} (Football), the act or result of a player's touching to the ground behind his own goal line a ball which received its last impulse from a man on his own side; -- distinguished from touchback. See {Touchdown}. Same as {safety}

{Safety tube} (Chem.), a tube to prevent explosion, or to control delivery of gases by an automatic valvular connection with the outer air; especially, a bent funnel tube with bulbs for adding those reagents which produce unpleasant fumes or violent effervescence.

{Safety valve}, a valve which is held shut by a spring or weight and opens automatically to permit the escape of steam, or confined gas, water, etc., from a boiler, or other vessel, when the pressure becomes too great for safety; also, sometimes, a similar valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, to prevent collapse. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • safety valve — ˈsafety valve noun [countable] a small part on a machine that opens to let out steam or pressure when it becomes too great: • the safety valve device on the boiler * * * safety valve UK US noun [C] ► PRODUCTION a part of a machine that opens to… …   Financial and business terms

  • safety valve — safety valves 1) N COUNT A safety valve is a device which allows liquids or gases to escape from a machine when the pressure inside it becomes too great. Residents heard an enormous bang as a safety valve on the boiler failed. 2) N COUNT A safety …   English dictionary

  • safety valve — n 1.) a part of a machine that allows gas, steam etc to escape when the pressure becomes too great 2.) something that allows you to get rid of strong feelings without doing any harm ▪ Being able to express emotion is a healthy safety valve for… …   Dictionary of contemporary English

  • safety valve — ► NOUN 1) a valve that opens automatically to relieve excessive pressure. 2) a means of giving harmless vent to feelings of tension or stress …   English terms dictionary

  • safety valve — n. 1. an automatic valve for a steam boiler, pressure cooker, etc., which opens if the pressure becomes excessive 2. any outlet for the release of strong emotion, energy, etc …   English World dictionary

  • safety valve — safety ,valve noun count 1. ) a part of a piece of equipment that allows gas, air, or liquid to escape when there is too much pressure inside 2. ) a way of getting rid of strong emotions without harming anyone …   Usage of the words and phrases in modern English

  • Safety valve — A safety valve is a valve mechanism for the automatic release of a gas from a boiler, pressure vessel, or other system when the pressure or temperature exceeds preset limits. It is part of a bigger set named pressure safety valves (PSV) or… …   Wikipedia

  • safety valve — UK / US noun [countable] Word forms safety valve : singular safety valve plural safety valves 1) a part of a piece of equipment that allows gas, air, or liquid to escape when there is too much pressure inside 2) a way of getting rid of strong… …   English dictionary

  • safety valve — apsauginis vožtuvas statusas T sritis automatika atitikmenys: angl. pressure relief valve; relief valve; safety valve vok. Überdruckventil, n; Entlastungsventil, n; Sicherheitsventil, n rus. предохранительный клапан, m pranc. clapet de décharge,… …   Automatikos terminų žodynas

  • safety valve — A form of pressure relief valve that opens to relieve the pressure in the container any time the pressure rises above a predetermined value. Safety valve: it ensures that the fluid bypasses anytime the pressure builds up beyond designated value …   Aviation dictionary

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