FEMA manufactures a variety of proportional cartridge valves, including PWM or Analog signal driven, packaged for manifold mounting, and interlocked dual pressure control. These are available as pilots or 2-stage models.

Technical Specifications

FEMA custom designs and develops products to specific customer needs. The following specifications are intended as examples. Please contact us with your application to learn more about our capabilities.

Analog Proportional Pressure Control Valve

The "Analog proportional pressure control valve" is an electro-hydraulic unit designed to modulate pressure from 0 to 30 bar (0 to 435 PSI). Flows range from .5 l/s to 3.75 l/s at 20 bar delta (8 to 60 GPM @290 PSID).

This two stage unit features high spool driving forces which enable it to overcome heavy contamination and debris. This valve can operate at contamination levels of ISO 25/23 intermittently, and ISO 19/16 continuously.

As shown in the schematic, this is a two position, normally closed, three way pressure control valve, and is designed for applications such as clutch control within power shift transmissions. It is also used on other various applications within the off road mobile market.

PTO Valve

The "PTO valve" is similar to the Analog unit, except it is a four way pressure control. This patented valve is designed to modulate pressure on two separate functions as command is increased.

As shown in the schematic, supply pressure is connected to the brake control port at zero command. As  command is increased, the brake port is modulated off proportionally, and  then the clutch port is modulated on proportionally. This means these two  separate functions are locked out from one another, and are controlled by a  single command (see gain curve).

PTO stands for "power take off", and as  named is used primarily on PTO applications where both a brake and clutch are used to disengage and then engage a function. The ability to modulate the brake is key, and results in less aggressive applications when implements are shut down.

Select a linkProportional Cartridge ValvesOn-Off Solenoids - 3-Way Valve - 4-Way Valve - Precision PilotProportional Pressure Controls (PPCs)