Automatic delivery of dose of a chemical solution into a pipe carrying a flowing fluid, uses arm projecting into drainage flow to open ball and allow release of chemical into drain

摘要

The dispenser is fitted to the side of the drainage U-bend (160), and comprises a container (210) for the chemical solution, a connecting pipe (236) closed by a ball , and an arm projecting into the interior of the U-bend to displace (250) the ball when waste passes through the U-bend.