3 FUNCTION VALVE vs 4 FUNCTION VALVE …
The NEW YELLOW 4 function valve has the following benefits:
- Turning the black knob will prime the pump with no head pressure
- Turning the yellow knob will relieve the pressure in the discharge line
- The yellow knob is the anti-syphon and back pressure side of the valve.
- Has double ball check valves
- Provides back pressure of 1.4 BAR which aids in the anti-syphon
With the NEW AD pumps you can use a 4FV as a degassing valve. The fast prime valve is open slightly, and … Open PDF 249kb