Relief valve
Relief Re*lief" (r?-l?f"), n. [OE. relef, F. relief, properly, a lifting up, a standing out. See {Relieve}, and cf. {Basrelief}, {Rilievi}.] 1. The act of relieving, or the state of being relieved; the removal, or partial removal, of any evil, or of anything oppressive or burdensome, by which some ease is obtained; succor; alleviation; comfort; ease; redress. [1913 Webster]

He sees the dire contagion spread so fast, That, where it seizes, all relief is vain. --Dryden. [1913 Webster]

2. Release from a post, or from the performance of duty, by the intervention of others, by discharge, or by relay; as, a relief of a sentry. [1913 Webster]

For this relief much thanks; 'tis bitter cold. --Shak. [1913 Webster]

3. That which removes or lessens evil, pain, discomfort, uneasiness, etc.; that which gives succor, aid, or comfort; also, the person who relieves from performance of duty by taking the place of another; a relay. [1913 Webster]

4. (Feudal Law) A fine or composition which the heir of a deceased tenant paid to the lord for the privilege of taking up the estate, which, on strict feudal principles, had lapsed or fallen to the lord on the death of the tenant. [1913 Webster]

5. (Sculp. & Arch.) The projection of a figure above the ground or plane on which it is formed. [1913 Webster]

Note: Relief is of three kinds, namely, {high relief} ({altorilievo}), {low relief}, ({basso-rilievo}), and {demirelief} ({mezzo-rilievo}). See these terms in the Vocabulary. [1913 Webster]

6. (Paint.) The appearance of projection given by shading, shadow, etc., to any figure. [1913 Webster]

7. (Fort.) The height to which works are raised above the bottom of the ditch. --Wilhelm. [1913 Webster]

8. (Physical Geog.) The elevations and surface undulations of a country. --Guyot. [1913 Webster]

{Relief valve}, a valve arranged for relieving pressure of steam, gas, or liquid; an escape valve. [1913 Webster]

Syn: Alleviation; mitigation; aid; help; succor; assistance; remedy; redress; indemnification. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • relief valve — n. SAFETY VALVE …   English World dictionary

  • Relief valve — The relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire. The pressure is relieved by allowing the pressurised fluid to flow… …   Wikipedia

  • relief valve — [1] A valve in the air pump of an air injection system which dumps part of the air at high pump speeds to prevent pump damage. It may be combined with the air gulp valve. [2] Safety device on a sealed system. It opens to release fluids before… …   Dictionary of automotive terms

  • relief valve — noun a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level • Syn: ↑safety valve, ↑escape valve, ↑escape cock, ↑escape • Hypernyms: ↑valve, ↑regulator * * * …   Useful english dictionary

  • relief 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

  • relief valve — A pressure control valve in any fluid system, which limits the pressure in the system by releasing it at a preset value. The pressure is not allowed to be built up above this preset figure. A typical oil pressure relief valve …   Aviation dictionary

  • relief valve — a device that, when actuated by static pressure above a predetermined level, opens in proportion to the excess above this level and reduces the pressure to it. Cf. safety valve (def. 1). * * * …   Universalium

  • relief valve — noun A safety valve that relieves pressure when it becomes high but before it becomes dangerous …   Wiktionary

  • Pressure relief valve — A pressure relief valve is a safety device that relieve in case of overpressure in vessel or piping. The generic term is or pressure relief Valve (PRV) or pressure safety valve (PSV).Main types of pressure relief valves include: *Relief valve… …   Wikipedia

  • negative pressure relief valve — A relief valve in an aircraft pressurization system that prevents the pressure in the cabin from becoming lower than the ambient outside pressure. The cabin air pressure safety valve combines functions of over pressure relief valve, vacuum relief …   Aviation dictionary

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