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The positive pressure valve provides a small positive push with
disconnection. It does not provide continual positive pressure. The
air eliminating valve on an inline filter is just that. It comes into play
primarily during priming. As the filter is filled with solution air vents
out through the air eliminating valve. Also if a small amount of air
enters the filter after priming it eliminates this. If for some reason the
filter becomes filled with air, the air acts as a lock preventing flow. It
is the fluid that helps push the air out of the filter. The filter
has NO impact on the connector. No matter whether you use a filter or
not the positive push from the connector is a momentary event. In
addition to develop this push at the end a similar volume of blood is refluxed
into the connector with connection. This occurs because for every action
there must be an equal opposite reaction. Positive push at the end
requires a negative event at the beginning.
Denise Macklin
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