Three-way cock
![](https://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Dreiwegehahn_fcm.jpg/220px-Dreiwegehahn_fcm.jpg)
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
- 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
- ^ 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 .).
- ↑ Wilfried Fischer: His pressure cooker flew the colleagues around the ears . In: Berliner Zeitung , August 20, 1997.
- ↑ Introduction of the three-way cock on Personenlexikon.net.