Inert diaphragm valves

Precision and reliability in controlling aggressive liquids and gases

Humphrey Inert Diaphragm Valves (iDP series) are developed for applications where chemical resistance, accurate flow control and contamination-free operation are essential. Thanks to the solenoid being fully isolated from the media and the use of high-grade materials such as Radel®, PEEK, Viton™GF, EPDM and FFKM, these valves guarantee a long service life, excellent compatibility and reliable performance, even in the most demanding medical, biotechnology and analytical applications.

The Humphrey iDP series consists of five model ranges, each designed for a specific balance between size, flow capacity and field of application.

Free CAD drawings are available via the Humphrey Products website and samples can be requested through Inacom Instruments, exclusive distributor for the Netherlands/Belgium.

iDP 101-serie: miniature 2-weg valve (10 mm wide)

The iDP 101-serie is a compact, 10 mm wide 2-weg solenoid valve, ideal for micro-dosing and laboratory applications where small volume and chemical inertness are crucial.

Key properties

• Diaphragm-isolated design for aggressive liquids
• Internal volumes: 30 µL (open), 3,6 µL (closed)
• Working pressure: 0 to 2,07 bar (30 PSI)
• Maximum back pressure: 1,03 bar (15 PSI)
• Flow: 550 mL/min (water), 20 SLPM (air) at 2 bar
• Materials: Radel® body, seals in FKM or EPDM
• Temperature range: -20 °C to +95 °C (EPDM) or 0 °C to +95 °C (FKM)
• Control: 12VDC or 24VDC, 1,5 W
• Weight: 11 grams
• Service life: more than a million cycles
• Compact manifold design, easy to integrate into analysers

Typical applications
Microfluidics, DNA analysis, blood and urine tests, medical micro-dosing, reagent flow in laboratories.

iDP 300-serie: compact 2- and 3-weg valves for aggressive media

The iDP 300-serie offers compact, durable valves with an inert flow path, available in 2-weg and 3-weg versions. Ideal for small-scale medical and biochemical systems.

Key properties

• Type: 2-weg or 3-weg, normally closed
• Working pressure: vacuum to 2,76 bar (40 PSI)
• Flow: 1,45 to 1,83 SLPM (water), 50 to 62 SLPM (air) at 2,7 bar
• Materials: PEEK body, seals in Viton®GF or EPDM
• Temperature range: -20 °C to +95 °C
• Power: 3,5 W at 12VDC or 24VDC
• Response time: 25 msec
• Proven durability: more than 20 million cycles
• Available with barbed or manifold connections

Typical applications
Analytical chemistry, clinical diagnostics, environmental monitoring, agent detection, water purification, dialysis equipment.

iDP 350/351-serie: 2-weg valves for high chemical resistance

The 350/351-serie is designed for higher flows and aggressive liquids, with a choice of EPDM, Viton™GF or FFKM elastomers for optimal chemical compatibility.

Key properties

• Type: 2-weg, normally closed
• Working pressure: 0 to 2,76 bar (40 PSI) or vacuum to 40 PSI
• Flow: 5,3 SLPM (water), 220 SLPM (air)
• Materials: Radel® body, seals in EPDM, Viton™GF or FFKM
• Temperature range: -20 °C to +95 °C
• Power: 8,3 W, 24VDC
• Response time: 16 msec
• Design: inline or manifold mounting
• Durable and fully factory-tested

Typical applications
Analytical instrumentation, clinical equipment, chemical process control, biotechnology, wastewater treatment.

iDP 370/371-serie: 3-weg valves for selective flow control

The 370/371-serie is a 3-weg version of the iDP family, developed for use as a selector or diverter valve. Thanks to the robust construction and chemically inert materials, the series is ideal for multichannel liquid systems.

Key properties

• Type: 3-weg, normally closed
• Working pressure: 0 to 2,76 bar (40 PSI)
• Selector application: up to 0,7 bar (10 PSI)
• Flow: 5,3 SLPM (water), 220 SLPM (air)
• Materials: Radel® body, seals in EPDM, Viton®GF or FFKM
• Temperature range: -20 °C to +95 °C
• Power: 8,3 W, 24VDC
• Response time: 20 msec
• Service life: more than 300 cycles per minute
• Available as inline or manifold version

Typische toepassingen
Vloeistofdistributie, agentdetectie, klinische diagnostiek, milieumonitoring, voedingsmiddelenanalyse, afvalstromen in medische systemen.

MiDP S390/S391-serie: proportional inert valves with stepper motor

The MiDP series is the latest generation of proportional inert diaphragm valves, fitted with a stepper motor for extremely accurate flow control. The valve combines the proven iDP design with intelligent control for modern process and dosing applications.

Key properties

• Type: 2-weg, proportionally controlled
• Working pressure: 0 to 4,1 bar (60 PSI)
• Flow: up to 8,5 SLPM (water), 390 SLPM (air) at 4 bar
• Cv: 0,31 (0,150” orifice)
• Materials: Radel® body, seals in EPDM, Viton™GF or FFKM
• Liquid temperature range: 0 to 80 °C
• Control: stepper motor, <2% hysteresis
• Power: 2,6 W, 600 mA per phase
• Response time: < 40 ms per step, cycle 2 sec (open or close)
• Service life: more than 1 million cycles

Typische toepassingen
Doseringssystemen, mengregeltoepassingen, klinische diagnostiek, endoscoopreiniging, medische vloeistofcontrole, gasflowregelingen in laboratoria.

Typical applications and markets

The Humphrey iDP series is designed for reliable operation with aggressive and sensitive media such as:

• Blood and biofluids
• Reagents and solvents
• Ultra-pure water
• Ethanol and alcohols
• Sodium hypochlorite (bleach)
• Caustic soda, formaldehyde, peroxide

Key fields of application

• Clinical and medical equipment (dialysis, immunoassay, haematology)
• Analytical and biotechnology systems
• Water purification and environmental monitoring
• Chemical process control
• Food and beverage industry
• OEM laboratory instrumentation

CAD files, samples and support through Inacom Instruments

All Humphrey iDP models come with free 3D CAD files via the official
Humphrey Products website.

For technical advice, samples and integration support, contact Inacom Instruments.