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 TM 55-1905-220-14-8
4-17.2. URINAL DISCHARGE VALVE - MAINTENANCE INSTRUCTIONS.
The urinal discharge valve is mounted downstream from the urinal. Liquid flushed from the urinal gravity-flows
downstream and enters the urinal discharge valve float chamber body. As the liquid level rises in the chamber, the float
becomes buoyant and begins to pick the ball off of the outlet port seat. As liquid and float rise in chamber, trapped air
passes by the umbrella valve. Now the discharge port is open so that system vacuum will remove liquid from the float
chamber. As the float and liquid begin to drop in chamber, a vacuum is formed above float which causes umbrella valve
to seal. This sealing action slows down the fall of the float long enough for all liquid and some air to enter vacuum
system. This air being added to the system is necessary to move the liquids efficiently to the collection tank. Ball and
float will then settle on the outlet-port to form a vacuum-tight seal. The purpose of the lower ball is to prevent back-flow
from the system lines into the urinal discharge valve float chamber.
4-651
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