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Proportional iDP Models Are Ready For Difficult Liquids and Gas.

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.

Available as inline (390 Series) or as manifold (391 Series) and to upstream pressure settings of 10, 20 and 40 PSI.

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iDP 390 & 391

Proportional iDP Valves

iDP 390 & 391 80 SLPM 8.3 watt 10 (0.68), 20 (1.37), 40 (2.75)


For more information on Proportional iDP 390 Series, visit the Online Catalog or download the iDP 390/391 brochure.

Humphrey offers application assistance throughout this process to ensure you achieve the best results. Call 844-447-9009 or email

Other industry terms for Proportional Solenoid Valves are Proportional Control Valves, Proportional Valves, Miniature Proportional Valves, Electronic Flow Control Valves, Electronic Flow Controllers, Analog Flow Control Valves, Solenoid Flow Controllers.