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Air / Vacuum Valves perform
two important functions when mounted at high points
on pipelines.
First
of all, they allow large quantities of air within
the line to be exhausted as that line is being filled.
When the air has been vented and the fluid level
reaches the air / vacuum valve, the float rises and seals tightly
against a synthetic seat.
Secondly, in the event of
the line being drained, either intentionally or
through a fracture in the system, the air / vacuum valve responds
to the loss of pressure and opens. This allows air
to re-enter the pipeline and prevents a potentially
damaging vacuum from developing. |
