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Proportional Control Valves

Proportional Control Valves: Allows for precise, restricted adjustable flow of pressurized media.

Product Lineup

Proportional Solenoid Valves

Humphrey Proportional Solenoid Valves

ProControl™ Valve Series

Proportional Control Solenoid Valves deliver variable output flow control from corresponding input current to its solenoid. The compact design of Humphrey’s ProControl™ Series is an excellent addition to any device or equipment and offers flexibility, precise control of flow, and economic advantages not available from on/off solenoid valves.

  • Small 2-Port Proportional Solenoid Valves
  • Large 2-Port Proportional Solenoid Valves
  • Proportional Solenoid Valve Driver

Inert Proportional Solenoid Valves

Humphrey Inert Proportional Solenoid Valves

The iDP Series of aggressive media solenoid valves has expanded. The diaphragm isolated 390 series 2-port proportional valve delivers a variable output flow of aggressive chemicals and cleaning fluids from a corresponding variable input current to its solenoid.

Similar to the 350 series ON/OFF direct solenoid valve in flow, size and shape, the 390 is the first of its kind in proportional control. For example, users of the 390 Series may now control liquid chemical flow “rate” under variable pressure conditions, or may vary the chemical dilution when mixing with water.

  • iDP 390 (inline)
  • iDP 391 (manifold)

Stepper Operated, Aggressive Media Proportional Valves

Humphrey Stepper Operated, Aggressive Media Proportional Valves

The MiDP Series features Humphrey’s new stepper motor operator that allows for precise positioning and flow control, with outstanding repeatability and low hysteresis. The flexing diaphragm poppet design safely isolates the stepper motor from media penetration, while the inert Radel™ body material ensures long life and sustained performance.

The wetted flow path is Humphrey’s 350 Series diaphragm separated design, which has more than 20 years of proven reliability in medical industry applications such as kidney dialysis equipment and endoscope reprocessing.

Available with variety of diaphragm elastomer options, including FFKM, EDPM and Viton™GF, the MiDP Series Proportional Valves is suitable for a multitude of applications requiring broad chemical and temperature compatibility.

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