Hydraulic Metering Pumps
Neptune 600 Series Hydraulic Diaphragm Metering Pump
600 Series high-capacity hydraulic pumps (635/637/647). ~130–240 gph (492–908 L/h), up to 600 psi (41.4 bar) on 316SS.
Max flow
approx. 492 – 908 L/h (130 – 240 gph); up to approx. 2,426 L/h / 641 gph class
Max pressure
316SS/C-20 to 41.4 bar (600 psi); PVC/PVDF to 10.3 bar (150 psi)
Turndown / accuracy
±1% (rated flow 10%–100%)
Wetted materials
316SS / C-20 / PVC / PVDF; diaphragm PTFE
Protection
—
Power
—
Features
- Oil By-Pass™ adjustable while running or stopped
- Hydraulically balanced PTFE diaphragm
- High-capacity models 635/637/647
- ±1% accuracy (10–100% of rated)
- Wetted: 316SS / C-20 / PVC / PVDF
- Optional ESC and VFD speed control
Specifications
| Flow range | approx. 492 – 908 L/h (130 – 240 gph); up to approx. 2,426 L/h / 641 gph class |
| Max pressure | 316SS/C-20 to 41.4 bar (600 psi); PVC/PVDF to 10.3 bar (150 psi) |
| Accuracy | ±1% (rated flow 10%–100%) |
| Wetted materials | 316SS / C-20 / PVC / PVDF; diaphragm PTFE |
| Drive | hydraulic diaphragm |
| Brand | Neptune (PSG Dover) |
Applications
Materials & media
| Wetted materials | 316SS / C-20 / PVC / PVDF; diaphragm PTFE |
Common chemicals: NaOCl, acids, alkalis, polymers — confirm compatibility when inquiring.
Controls & communication
Control options are listed in notes or confirmed on inquiry.
Models & specs
| Model | Flow | Pressure | Notes | |
| 635-N3 | 492 L/h (130 gph) | to 41.4 bar (600 psi) @ 2HP | plunger 2", 117 SPM; 316SS | |
| 635-N5/N8 | 492 L/h (130 gph) | to 10.3 bar (150 psi) | PVC/PVDF | |
| 637-N3 | 605 L/h (160 gph) | to 41.4 bar (600 psi) @ 2HP | plunger 2", 144 SPM | |
| 637-N5/N8 | 605 L/h (160 gph) | to 10.3 bar (150 psi) | ||
| 647-N3 | 908 L/h (240 gph) | to 13.8 bar (200 psi) @ 2HP | plunger 2-1/2", 144 SPM | |
| 647-N5/N8 | 908 L/h (240 gph) | to 13.8 bar (200 psi) |
Dimensions & installation
Dimensional drawings available on request (CAD / PDF).
Downloads
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