petcock

A small valve or tap which is used to control the flow of liquid. You may find one at the bottom of a radiator to permit draining the radiator. A petcock may also be found on the line coming from the fuel tank in small engines and motorcycles. It allows you to cut the flow of gasoline going to the carburetor. On some motorcycles, the position of the petcock lever may permit draining the last part of the fuel tank as a reserve position. In units where the carburetor is fed by gravity feed from a fuel tank, turning off the petcock when the unit is not in operation may prevent gasoline from leaking past the carburetor's needle and seat and into the crankcase to dilute the oil.

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • petcock — 1864, from COCK (Cf. cock) (n.2); the signification of the first element is uncertain …   Etymology dictionary

  • petcock — [pet′käk΄] n. [< obs. pet (< Fr: see PETARD) + COCK1] a small faucet or valve used in draining unwanted or excess water or air from pipes, radiators, boilers, etc …   English World dictionary

  • Petcock — A petcock is a small valve used to control the flow of liquid or gas. Although petcocks are used in a wide variety of applications, the following passage will describe one of the most common applications of the petcock which is the control of… …   Wikipedia

  • petcock — noun Etymology: pet (perhaps from petty) + cock Date: circa 1864 a small cock, faucet, or valve for releasing a gas (as air) or draining …   New Collegiate Dictionary

  • petcock — /pet kok /, n. a small valve or faucet, as for draining off excess or waste material from the cylinder of a steam engine or an internal combustion engine. Also, pet cock. [1860 65; pet, perh. < F pet (see PETARD) + COCK1] * * * …   Universalium

  • petcock — noun A small valve, spout, or faucet operated by hand, usually used to release pressure or drain fluid …   Wiktionary

  • petcock — n. small valve or faucet used used to drain off waste material or reduce pressure …   English contemporary dictionary

  • petcock — noun a small valve in a pipe or cylinder for drainage or testing …   English new terms dictionary

  • petcock — pet•cock [[t]ˈpɛtˌkɒk[/t]] n. bui a small valve or faucet, as for draining off excess or waste material from the cylinder of an internal combustion engine • Etymology: 1860–65; pet, perh. < F pet (see petard) +cock I …   From formal English to slang

  • petcock — /ˈpɛtkɒk/ (say petkok) noun a small valve or tap, as for draining off excess or waste material from the cylinder of a steam engine or for checking the water level in a boiler. {pet(ty) + cock1} …   Australian English dictionary

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