Nova-Tech Pulsafeeder 5-Function Valve User Manual

5-FUNCTION VALVE

INSTALLATION OPERATION MAINTENANCE INSTRUCTIONS

1. Tubing Version: Remove the tubing nut from the discharge valve cartridge on the top of the
pump head. Install the supplied Viton O-ring (#L1501200-VTN)* into the groove around the
tubing tip on the valve cartridge. Hand-tighten the 5-Function Valve onto the discharge valve of
the pump. Connect the discharge tubing to the “OUTLET” port and the bypass tubing to the
“RETURN” port of the 5-Function Valve.

**PRESOAK TUBE: Prior to assembly soak tube end in 180°F to Boiling Water (approx. the
water temperature from the discharge of an office coffee maker). Soak time should be a
minimum of 30 seconds.

2. NPT Version: Apply plumbers tape or sealant to the threads of the 5-Function Valve. Screw
“INLET” connection into the discharge valve of the pump head. Connect piping to the
“OUTLET” and “RETURN” port connections of the 5-Function Valve.

*If Viton is not compatible with fluid being pumped and alternate Teflon O-Ring is available
(L1501200-TFE). Viton is the preferred sealing material with difficult to seal fluids like
Sodium Hypochlorite and similar

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5-FUNCTION VALVE OPERATIONS:

Pressure Relief Function (PRV):

Designed to relieve excessive pump discharge pressure (approximately 50% above PRV
rating). PRV is functional anytime the bottom control knob is turned to the letter “C”, also
labeled “PUMP” position.

Color code for PRV Rating:

Black........40-psi Spring part #L1104400-000

Blue.......100-psi Spring part #L1104500-000

Green.....150-psi Spring part #L1104600-000

Red........250-psi Spring part #L1104700-000

1. 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 anytime the 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. The pumps’ rated
pressure does not have to be de-rated when the back pressure knob is in the “ON”
position.

2. Anti-Siphon Function:
The anti-siphon function prevents siphoning through the pump when pumping to a
receptacle lower than the pump. This feature is active when the top knob is turned to
the letter “A”, also labeled “ON” position.

3. 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 bypassing air and fluid out the “RETURN” connection. This
feature will function when the bottom knob is turned to the letter “D”, also labeled
“BLEED” position.

4. 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 the “B”, also labeled “OFF” position, and the
bottom knob to the “D”, also labeled “BLEED” position. This will bypass the discharge
line fluid through the “RETURN” line of the 5-Function Valve.

Maintenance:

The only maintenance required is to replace the diaphragms 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
weep 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.

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