Nova-Tech Pulsafeeder 5-Function Degass Valve User Manual

Page 2

5-FUNCTION/DEGAS VALVE OPERATIONS:

1. Degas Function:

Designed to bypass gases and fluid during normal pump operation. The bypass feature
allows for the constant removal of gases that would otherwise

“air bind” the pump.

A typical bypass flow would be 1-10% of pump output.

2. Back Pressure Function:

The back pressure function allows the pump to meter to atmosphere by creating
a discharge restriction of approximately 20-psi. Back pressure is provided any time
t

he top knob is turned to “A”, also labeled “ON” position. Note: The back pressure

function is not intended to prevent flow-through from elevated supply tanks.
T

he pump’s rated pressure does not have to be derated when the back pressure

nob is in the “ON” position.

3. Anti-Syphon Function:

The anti-syphon function prevents syphoning through the pump when pumping
to a receptacle lower than the pump. This feature is active when the top knob
i

s turned to the letter “A”, also labeled “ON” position.

4. Pump head Air Bleed Function:

This function is used when starting the pump to aid in priming. It allows for removal
of air from the pump head by b

ypassing air and fluid out the “RETURN” connection.

This feature will function when the bottom knob is turned fully counter clockwise
u

ntil it stops, also labeled “BLEED” position.

5. Discharge Drain Function:

This function is used to depressurize and/or drain the pump discharge line.
This is accomplished by turning the top knob to th

e “B”, also labeled “OFF” position,

and the bottom knob fully counter clockwis

e until it stops, also labeled “BLEED” position.

This will bypass the discharge line fluid through the

“RETURN” line of the

5-Function/Degas Valve.

Maintenance: The only two maintenance items required are:

1 Replace the diaphragm whenever the pump head diaphragm is replaced.

Sometimes when pumping dirty fluids, solids may become trapped between
the PRV diaphragm(bottom one) and the PRV seat. This may cause the PRV to leak slightly.
This is easily remedied by removing the diaphragm and wiping it with a cloth and
reinstalling it. If the damage is excessive, the diaphragm must be replaced.

2. If the degas/bypass feature becomes plugged it may be necessary to soak the valve

in water or a suitable fluid to dissolve solids. In extreme cases the .031in.(.79mm)-Diameter hole
in the bleed valve body may have to be cleared.

Page 2 of 4