A stopcock is a valve used to restrict or isolate the flow of a liquid or gas through a pipe.

In Great Britain a stopcock, not to be confused with a gate valve or a DiCiaccio branch, is used to prevent flow of water into a domestic water system. There are usually two stopcocks for a home. One is usually found just outside the property boundary and can be used to isolate the building from the water supply. The other is inside the property where the supply enters the property. These valves are provided to allow maintenance and prevent flooding if the domestic water system is pierced.

Laboratory glassware

For laboratory glassware, items sometimes have plug valves with conically-tapered inserts called stopcocks (sometimes referred to as "plugs" by the layperson). The valve bodies are usually made of glass, while the plugs are made of glass or Teflon. When the plug is made of glass, the handle and plug are fused together in one piece out of glass. When both valve body and plug are made of glass, grease is usually used to give a good seal, as well as to prevent the valve from seizing and subsequently cracking.

Special stopcocks are available, such as a double-oblique design used in Schlenk lines which permit the application of inert gas and vacuum from the same stopcock.

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Stopcock — Stop cock , n. 1. A bib, faucet, or short pipe, fitted with a turning stopper or plug for permitting or restraining the flow of a liquid or gas; a cock or valve for checking or regulating the flow of water, gas, etc., through or from a pipe, etc …   The Collaborative International Dictionary of English

  • stopcock — ► NOUN ▪ an externally operated valve regulating the flow of a liquid or gas through a pipe …   English terms dictionary

  • stopcock — [stäp′käk΄] n. a cock or valve for stopping or regulating the flow of a fluid, as through a pipe …   English World dictionary

  • stopcock — UK [ˈstɒpˌkɒk] / US [ˈstɑpˌkɑk] noun [countable] Word forms stopcock : singular stopcock plural stopcocks something on a pipe that you turn to stop or to start the flow of liquid …   English dictionary

  • stopcock — [[t]stɒ̱pkɒk[/t]] stopcocks N COUNT A stopcock is a tap on a pipe, which you turn in order to allow something to pass through the pipe or to stop it from passing through …   English dictionary

  • stopcock — čiaupas statusas T sritis chemija apibrėžtis Detalė vamzdžio gale, kuria sustabdoma (paleidžiama) skysčio ar dujų srovė. atitikmenys: angl. faucet; stopcock; tap rus. кран …   Chemijos terminų aiškinamasis žodynas

  • stopcock — noun Date: 1584 a cock for stopping or regulating flow (as through a pipe) …   New Collegiate Dictionary

  • stopcock — /stop kok /, n. cock1 (def. 3). [1575 85; STOP + COCK1] * * * …   Universalium

  • stopcock — noun /ˈstɒpkɒk/ a) A valve, tap or faucet which regulates the flow of liquid or gas through a pipe. b) A main shutoff for water to a home from a municipal supply. Usually these valves exist in pairs, on outside the property boundary and one… …   Wiktionary

  • stopcock — stop|cock [ˈstɔpkɔk US ˈsta:pka:k] n a ↑tap that controls the flow of a liquid or gas through a pipe …   Dictionary of contemporary English

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”