Edwards Stokes Microvac 212JPumping speed 234 m³/hUltimate pressure 0.033 mbar
Edwards Stokes Microvac 412J 3Ph 460 V 60 Hz, NEMA motor 10 hp, coil 230/460 V
The Edwards Stokes Microvac 412J is an oil-sealed rotary piston vacuum pump with a pumping speed of 442 m³/h and an ultimate pressure below 0.033 mbar. The low speed of 500 min⁻¹ ensures a long service life. Ehrler & Beck advises on selection and service.
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- Pumping speed 442 m³/h 50 Hz 442 m³/h 60 Hz
- Ultimate pressure 0.033 mbar
| Variant | Part number |
|---|---|
| 3Ph 460 V 60 Hz, NEMA motor 10 hp, coil 230/460 V (selected) | 900-412-014 |
| 3Ph 460 V 60 Hz, Motor 15 hp | 900-412-015 |
| 3Ph 230/460 V 60 Hz, explosion-proof | 916-412-014 |
| 3Ph 460 V 60 Hz, 15 hp, explosion-proof Class 1 Div 1 Group C&D (North America) | NRY7BV000 |
| 3Ph 575 V 60 Hz, CSA (Canada) | 919-412-014 |
| 3Ph 380 V 50 Hz, without CE marking | 924-412-014 |
| 3Ph 230/460 V 60 Hz, coil 115 V | 931-412-014 |
| 3Ph 380 V 60 Hz, derated motor | 945-412-014 |
| 3Ph 230/460 V 60 Hz, 15 hp, coil 110 V | 966-412-014 |
| 3Ph 230/460 V 60 Hz, with Water Miser (cooling water saver), coil 230/460 V | 970-412-014 |
| 3Ph 460 V 60 Hz, coil 24 V DC | 971-412-014 |
| 3Ph 460 V 60 Hz, with oil reservoir heater and Water Miser | NRY1EF000 |
| 3Ph 460 V 60 Hz, stainless steel valve plate, coil 460 V | NRY1FN000 |
Edwards Stokes Microvac 412J – rotary piston vacuum pump from the Stokes Microvac series
The Stokes Microvac pumps have been in use for more than 80 years. The Stokes Microvac 412J delivers 442 m³/h and reaches an ultimate pressure below 0.033 mbar; at 500 min⁻¹ it runs slowly and is correspondingly long-lived. The pump is water-cooled and weighs around 850 kg.Features
- Robust design in grey and ductile cast iron
- Few moving parts and large clearances for high availability
- Automatic lubrication of bearings and sealing surfaces with backflow barrier
- Gas ballast as standard
- Easy to maintain on site; compact footprint
- Controlled balancing for low vibration
Operating limits
Edwards approves the Microvac pumps only for air, nitrogen and other inert gases. Oxygen, hydrogen and chemically active, corrosive or flammable gases must not be pumped.Typical applications
Edwards names, among others, the automotive industry, metallurgy, vacuum coating, vacuum melting, chemical processing, heat treatment, leak detection, PET processing, pharmaceuticals and transformer drying.Versions
The versions listed in the Edwards webshop are mostly 60 Hz versions with NEMA motors; one 380 V 50 Hz version is expressly without CE marking. The operating instructions list CE-marked pumps with IEC motor (200/400 V 50 Hz) under separate part numbers – please ask Ehrler & Beck.Advice and service
Ehrler & Beck supports you in selection, supplies oil and spare parts and carries out maintenance and repair.| Pumping speed 50Hz | 442 |
|---|---|
| Pumping speed 60Hz | 442 |
| Ultimate pressure | 0.033 |
| Weight | 850 |
| Height | 139.5 |
| Inlet connection flange | 4" ANSI |
| Outlet connection flange | 3" NPT/flange |
| Noise level | 83 dB(A) |
| Cooling method | Water cooling |
| Oil type | V-Lube F |
Additional technical data
| Technical data | Value |
|---|---|
| Design | Oil-sealed rotary piston vacuum pump, water-cooled, belt drive |
| Max. pumping speed | 442 m³/h |
| Pumping capacity (displacement) | 510 m³/h (300 cfm) |
| Ultimate pressure | < 0.033 mbar (< 25 µm Hg) |
| Pump speed | 500 min⁻¹ |
| Motor | NEMA motor 230/460 V 60 Hz: 10 hp; IEC motor 200/400 V 50 Hz (CE pumps): 11 kW |
| Sound pressure level (1 m, ultimate pressure) | < 83 dB(A) |
| Connections | Inlet 4" ANSI, outlet 3" NPT/flange |
| Cooling water | max. 7.6 l/min, inlet temperature max. 30 °C, connections ½" NPT |
| Oil | V-Lube F (normal operation), V-Lube G (operating temperature above 71 °C); filling 45 l |
| Weight (net) | 850 kg |
| Footprint / height | 1022 × 651 mm / 1395 mm |
| Ambient temperature | 12 to 40 °C |
| Use | only for air, nitrogen and other inert gases; not for oxygen, hydrogen or chemically active, corrosive or flammable gases |
Edwards Stokes Microvac 212JPumping speed 234 m³/hUltimate pressure 0.033 mbar