Product Description
OEM Stokes Microvac 412J Rotary Piston Vacuum Pump - 919-412-014 575V 3Ø 60Hz CSA
The Edwards Stokes Microvac 412J is a heavy-duty, oil-sealed rotary piston vacuum pump built for continuous industrial service. This 919-412-014 configuration is 575 V, 3-phase, 60 Hz, CSA configuration. The self-contained design combines the pump, motor, oil reservoir, gas ballast, automatic lubrication, belt guard and cooling-water circuit in one ready-to-install package.
Manufacturer part number: 919-412-014
| Pumping Speed | Ultimate Vacuum | Motor | Electrical |
|---|---|---|---|
| 260 cfm | <25 microns Hg | CSA configuration | 575 V, 3-phase, 60 Hz |
Overview
The 412J uses an eccentric-driven rotary piston guided by two free-oscillating hinge bars. Gas enters through the piston slide, is isolated as the piston passes top center, and is compressed through heavy-duty poppet exhaust valves. Internal oil passages automatically lubricate the shaft bearings and maintain the piston-to-cylinder vacuum seal.
An oil-solenoid valve helps prevent the pump from flooding with oil after a power failure or shutdown without a vacuum break. The integral gas ballast can be used when pumping condensable vapor loads. The 412J also provides oil-temperature sensor and heater access ports for process-specific monitoring and cold-start support.
Features and Benefits
- Industrial cast-iron and ductile-iron construction for demanding processes
- Low 490 rpm pump speed for long service life
- 442 m³/h (260 cfm) nominal pumping speed
- Ultimate vacuum below 0.033 mbar without gas ballast
- Automatic internal lubrication with no external oil piping
- Integral gas ballast for condensable vapor handling
- Oil-solenoid protection against oil flooding
- Water-cooled, self-contained package delivered ready for installation
- Simple mechanism with relatively few moving parts for easier field maintenance
Technical Specifications
| Manufacturer | Edwards / Stokes |
| Model | Microvac 412J |
| VPS SKU / Edwards Part Number | 919-412-014 |
| Pump Technology | Oil-sealed rotary piston vacuum pump |
| Configuration | CSA configuration |
| Nominal Pumping Speed | 442 m³/h (260 cfm) |
| Displacement | 510 m³/h (300 cfm) |
| Ultimate Vacuum | <0.033 mbar (<25 microns Hg / <0.025 Torr), without gas ballast |
| Pump Speed | 490 rpm |
| Motor | CSA configuration |
| Electrical Supply | 575 V, 3-phase, 60 Hz |
| Oil-Solenoid Coil | Confirm installed coil voltage |
| Vacuum Inlet | 4-inch ASA/ANSI flange |
| Vacuum Exhaust | 3-inch NPT / flange |
| Cooling-Water Connections | 1/2-inch NPT inlet and outlet |
| Maximum Cooling-Water Flow | 7.6 L/min (2 gpm) |
| Maximum Inlet-Water Temperature | 30 °C (85 °F) |
| Recommended Oil | Edwards / Stokes V-Lube F; confirm oil for process and temperature |
| Oil Capacity | 46 L (12 US gal) |
| Noise Level at 1 Meter | <83 dB(A) at ultimate pressure |
| Vibration Severity | 7 mm/s RMS |
| Net Weight | 850 kg (1,875 lb) |
| Shipping Weight | 896 kg (1,975 lb) |
| Floor Space | 1,022 x 651 mm (40-1/4 x 25-5/8 in) |
| Overall Height | 1,395 mm (55 in) |
| Operating Ambient Temperature | 12 to 40 °C (54 to 104 °F) |
Motor full-load amperage, efficiency, exact speed, certification markings and installed coil voltage should be confirmed from the supplied configuration and motor nameplate.
Performance Curve
The solid curve shows operation without gas ballast. The dashed curve shows operation with gas ballast.
Dimensions
Verify the current Edwards submittal drawing and installed motor or accessory arrangement before designing fixed piping or foundations.
Available 412J Configurations
| Edwards Part Number | Configuration |
|---|---|
| 900-412-014 | 230/460 V, 3-phase, 60 Hz with matching-voltage coil |
| 900-412-015 | 15 hp, 460 V, 3-phase, 60 Hz |
| 916-412-014 | 230/460 V, 3-phase, 60 Hz explosion-proof configuration |
| 919-412-014 | 575 V, 3-phase, 60 Hz, CSA configuration |
| 924-412-014 | 380 V, 3-phase, 50 Hz, non-CE configuration |
| 931-412-014 | 230/460 V, 3-phase, 60 Hz with 115 V oil-solenoid coil |
| 945-412-014 | derated motor, 380 V, 3-phase, 60 Hz |
| 966-412-014 | 15 hp, 230/460 V, 3-phase, 60 Hz with 110 V coil |
| 970-412-014 | 230/460 V, 3-phase, 60 Hz with Water Miser |
| 971-412-014 | 460 V, 3-phase, 60 Hz with 24 V DC oil-solenoid coil |
| NRY1EF000 | 460 V, 3-phase, 60 Hz with oil-reservoir heater and Water Miser |
| NRY1FN000 | 460 V, 3-phase, 60 Hz with stainless-steel valve deck and 460 V coil |
| NRY7BV000 | 15 hp, 460 V, 3-phase, 60 Hz, Class I Division 1 Groups C & D |
Need Help Selecting a 412J?
Send us the required voltage, frequency, process gas, installation location, hazardous-area classification and control voltage. We will confirm the correct new 412J configuration.
Applications
- Heat treatment and metallurgy
- Vacuum coating and vacuum melting
- Transformer drying and cable-fluid conditioning
- PET processing
- Automotive leak detection
- Pharmaceutical and general industrial processes
- Vacuum drying and distillation
Application note: Standard hydrocarbon-oil pumps are intended for air, nitrogen and compatible inert gases. Edwards warns against pumping oxygen-rich, hydrogen, chemically active, corrosive, flammable or otherwise hazardous gas mixtures without application-specific review.
Maintenance, Repair Kits and Oil
- Shop Stokes 412J repair kits and parts
- Edwards 412-14J pump maintenance kit - 429-638-015
- Edwards 412J-14 valve-deck maintenance kit - KIT001422
- Review Stokes V-Lube oil recommendations
Resources
- Edwards 212J/412J Microvac Instruction Manual - S14901880
- Edwards Stokes Microvac Rotary Piston Pump Brochure
- Official Edwards 412J variant family
Specifications were compiled from Edwards S14901880, the Edwards US webshop 412J family and Edwards Stokes Microvac sales literature. Specifications are subject to manufacturer revision.
