DH103A- 3-Way Pilot Operated Spool Valve

3-Way Pilot Operated Spool Valve. The DH103A/B/C Series Valves are used in normally closed or normally open directional control three way circuits requiring remote pilot actuation. The DH103 Series Valves are used to direct flow alternately from either side of a closed loop transmission for cooling or filtering. All external parts are zinc plated.

Operation (pressure at port 4 additive to spring).
DH103A (Normally Open)
• Neutral (Deactivated)
Port (3) open to port (2), port (4) is blocked.
• Activated with pilot pressure at port (1):
Port (3) open to port (4), port (2) blocked.
Note: There is an air breather vent plug in the end cap to allow for air pressure equalization in the spring chamber
DH103B (Normally Closed)
• Neutral (Deactivated)
Port (4) open to port (3), port (2) is blocked.
• Activated with pilot pressure at port (1):
Port (3) open to port (2), port (4) blocked.
DH103C (Normally Open)
• Neutral (Deactivated)
Port (3) open to port (2), port (4) is blocked.
• Activated with pilot pressure at port (1):
Port (3) open to port (4), port (2) blocked.