Walchem EHE Series Metering Pumps

EHE

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The Walchem EHE Series Metering Pumps by Walchem deliver versatile chemical dosing with flow rates up to 20 GPH at 150 PSI. Featuring a 1800:1 turndown ratio, microprocessor control, and dual check valves, they’re ideal for water treatment, metal finishing, and industrial applications requiring precision and reliability.
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Manufacturer: Walchem (Iwaki America Inc.)
Product Type: Diaphragm Metering Pump
Applications: Water treatment, cooling towers, boilers, metal finishing, wastewater management
Max Flow Rate: 20 GPH (75 LPH)
Design Features:
  • 1800:1 turndown ratio with 360 SPM
  • Microprocessor control for manual or external inputs
  • Dual check valves for reliable priming
Max Pressure: 150 PSI (10 bar)
EH-HV Variant: High-viscosity model, 2.3-8 GPH, 73 PSI
Materials: PVC liquid ends, stainless steel valve balls (EH-HV)
Custom Options:
  • Control: Pulse, 4-20mA signal
  • IP65-rated housing
  • 2-year warranty on all parts
Model Component Options Description
Pump Series EH Microprocessor control for all EHE models with manual and external speed control. It allows control from 1 to 300 SPM in 1 SPM increments.
Capacity/Pressure Rating E31, E36, E46, E56 Defines maximum output capacity and pressure. For example: E31: 5.5 GPH at 150 PSI E36: 8.5 GPH at 105 PSI
Voltage 1, 2 1 = 115VAC, 50/60 Hz 2 = 230VAC, 50/60 Hz
Control Module E External pulse control with options for divide, multiply, and analog input (4-20 mA signal).
Liquid End PC, PE, VC, VE, VF Material options for pump head and valves. For example: PC = GFRPP, FKM PE = GFRPP, EPDM
Options V, T, P Connection and valve options: V = Standard 1/2” tube connections T = 3/4” MNPT pipe connections P = 3/4” NPT pipe connections

Capacity/Pressure Ratings

Size GPH mL/min Max Output per Stroke (mL) Max Pressure (PSI) Power Index (GPH x PSI)
E31 5.5 340 0.94 150 825.0
E36 8.5 540 1.44 105 892.5
E46 12.0 750 2.08 60 720.0
E56 15.0 940 2.48 60 900.0

Liquid End Materials

Liquid End Fittings Diaphragm Valve Balls Valve Seats Valve Seals Gasket Tubing
HV GFRPP SS/HC PCTFE FKM PTFE PTFE PE
FC GFRPP CE CE FKM PTFE PTFE PE
PC GFRPP PTFE CE FKM EPDM PTFE PE
PE GFRPP EPDM CE EPDM EPDM PTFE PE