Solenoid Diaphragm
| Identification | |
| Manufacturer | IWAKI |
| Series | EHN Series |
| Model / size | EHN-B31 |
| Dosing type | Solenoid Diaphragm |
| Pump class | Category A — Solenoid diaphragm, low-flow precision dosing. Stroke frequency 180 SPM. Accuracy ±2.0%. Best for: intermittent duty, water treatment, swimming pools. Limit: 6.4 L/h, 7.0 bar. |
| Spec code | DSG-039 |
| Dosing duty | |
| Min flow | 1 L/h |
| Max flow | 6.4 L/h |
| Max pressure | 7 bar |
| Dosing accuracy | 2 % |
| Stroke frequency | 180 spm |
| Suction lift | 1.5 m |
| Max viscosity | 300 cP |
| Control & drive | |
| Control type | Manual + Pulse + Analog |
| Stroke adjustment | Manual 0-100% |
| Power | 31 W |
| Supply voltage | 100-230 VAC V |
| IP rating | IP55 |
| Materials & chemical | |
| Liquid end | PP |
| Diaphragm | PTFE/EPDM |
| Valve / ball | Ceramic |
| pH range | 0-14 (full range — HF, concentrated acids, caustic) |
| Chemical compatibility | Chlorine, pH adjustment, coagulants, antiscalant |
| Application | |
| Service | Water Treatment, Industrial Dosing |
| Key features | IWAKI EHN-B31, 6.4 L/h at 7 bar, PP liquid end, pulse/analog control, 180 SPM |
A complete, shareable page for a single pump. It plots the performance curve (head, efficiency and NPSHr against flow, with the best-efficiency point marked, or dosing flow against stroke), decodes the API 682 / ISO 21049 mechanical seal plan, and lists the full specification — duty and operating range, drive and motor, materials of construction, build and reliability, connections, weight and certifications. Pop-up panels give the type-specific preventive-maintenance schedule (daily to annual tasks with procedures) and a troubleshooting guide (symptoms, probable causes and recommended solutions).
Run a centrifugal pump near its BEP and keep dosing pumps in their recommended stroke band. Data is from the engineering reference database — confirm against the manufacturer's certified curve before procurement.
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