Three-way cock

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Three-way cock on a PVC

The three-way cock (3-way cock) is a stop cock with three connections. It is used to convey gases or liquids .

Each direction can be closed individually, creating a connection between the other two; or all three directions are connected. Depending on the construction, it may also be possible to lock in all directions at the same time in the inclined position.

A more flexible implementation of the multi-way valve is the four-way valve, which has also been used for a long time. A mixing valve or distribution valve is used for the precise setting of a mixing ratio .

commitment

1) closed
2) inflow above, outflow left
3a) inflow above, outflow left and right
3b) inflow above and left, outflow right
4) inflow above, outflow right
  • The first application was probably made by its inventor Denis Papin between 1675 and 1679, who used the three-way cock in steam experiments that he carried out with Robert Boyle in London .
  • The three-way stopcock is used in the medical field to allow two infusions to run into the patient's vein simultaneously, one after the other or alternately via an indwelling venous cannula .
  • In fuel systems , the tap is used to:
    a) switch to a reserve tank
    b) switch to a second (reserve) fuel filter .

Web links

Commons : 3-way valves  - collection of pictures, videos and audio files

Individual evidence

  1. ^ Christian Schmidt: The steam engines . Reprint of the translation of Dionysius Lardner's work . Carey and Hart, Philadelphia 1836. Saltwater, 2009, pp. 166 (English: The Steam Engines Familiarly Explained and Illustrated, with additions and notes by James Renwick .).
  2. ↑ Wilfried Fischer: His pressure cooker flew the colleagues around the ears . In: Berliner Zeitung , August 20, 1997.
  3. ↑ Introduction of the three-way cock on Personenlexikon.net.