English: A traditional gravity toilet tank concluding the flush cycle. As the water level in the tank drops, the flush valve flapper falls back to the bottom, stopping the main flow to the flush tube. Because the tank water level has yet to reach the fill line, water continues to flow from the tank and bowl fill tubes. When the water again reaches the fill line, the float will release the fill valve shaft and water flow will stop. 1. float, 2. fill valve, 3. lift arm, 4. tank fill tube, 5. bowl fill tube, 6. flush valve flapper, 7. overflow tube, 8. flush handle, 9. chain, 10. fill line, 11. fill valve shaft, 12. flush tube
Deutsch: Funktionsprinzip eines Spülkastens US-amerikanischer Bauart: Durch Betätigung des Auslösehebels (8) wird der Verschluss (6) geöffnet und das Wasser strömt durch das Rohr (12). Mit dem Wasserspiegel sinkt der Schwimmer (1) und betätigt das Ventil (11). Durch die Düse (4) wird der Kasten mit Wasser gefüllt, bis der mit dem Wasserspiegel ansteigende Schwimmer das Ventil schließt. Die Düse (5) dient, falls vorhanden, dazu, den Siphon (und damit verbunden teilweise die Toilettenschüssel) mit Wasser zu füllen, da durch das sehr schnell abfließende Spülwasser nicht genügend Sperrwasser im Geruchsverschluß verbleibt. Das Rohr (7) wirkt auch als Schutz gegen Überlaufen, falls der Schwimmer das Ventil nicht korrekt schließen lässt.
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{{Information |Description=A traditional gravity toilet tank at start of flush cycle. When the flush handle is pushed downward, the chain lifts the flush valve flapper. As the water level drops below the fill line, the float lowers the lift arm, causing