SS couples the Magnetic Force output of a solenoid with a poppet, spool, gate or butterfly valve to produce ON/OFF or Proportional Hydraulic or Pneumatic control.
Proportional Flow Control Valves, 2-Way,
Proportional Pressure Control Valves, Relief and Reducing/Relieving.
Digital Valves, an ON/OFF valve cycled with a Duty Cycle at a Frequency to produce a time averaged proportional output. These valves can be 2 or 3-Way.