Differential Pilot Valves

Differential Pilot models are operated with a button bleeder that shifts the spool. The loss of pressure through the button bleeder shifts the internal spool.
Code Prefixes Description Symbol
D D, BD
ND
2-position, double differential pilot, friction positioned. Spool stays in shifted position when buttons are released. D
DO DO, BDO
NDO
2-position, single differential pilot, spring returned spool. Spool returns to position "C" when the button is pressed. DO
DY DY, BDY
NDY
3-position, spring centered. Spool returns to center position when both buttons are closed or open. DY