Direct Drive Proportional Valves
Direct drive valves differ from two-stage pilot valves in that the solenoid armature is directly coupled to the valve spool. Thus, the valve spool is driven solely by the force generated from the armature itself. Direct drive valves are simpler, have no quiescent flow, are generally smaller, but have less driving force than two-stage valves. To improve performance in contaminated fluid medium, FEMA direct drive proportional valves utilize a fine mesh filter on the sleeve ports to keep damaging debris out of the metering area. Whereas our two-stage valves are rated as high as ISO 29/23, FEMA direct drive valves are rated up to ISO 25/20. Since most hydraulic systems operate at or below levels of ISO 19/16, FEMA direct drive valves are more than adequate to exceed performance needs.
Production direct drive valves include
- Two, three, and four-way control
- On/off and proportional
- Flow control
- Pressure control
- Mechanical feedback