5/2 way Namur Mounted Lever Valve: # HVRZN 731 701
Default: Lever in Middle Position, Actuator is Piloted by Positioner
With this hand lever valve, the actuator/valve assembly can be open or closed by this Hand Lever Valve.
5/3 way Namur Mounted Lever Valve: # HVRZN 731 702
When the knob of the lever is pushed, actuator is piloted by the positioner; "normal" mode.
When the knob is pulled, actuator/valve can be open, closed or put in intermediate positions; "manual mode".
Spec sheet - Page 179
When you need to override a positioner.