Product Description
Edwards OEM Stokes Microvac 212J Rotary Piston Vacuum Pump - 900212014
The Edwards Stokes Microvac 212J is a heavy-duty, oil-sealed rotary piston vacuum pump built for continuous industrial service. This configuration includes a 230/460 V, three-phase, 60 Hz motor and a 230/460 V oil-solenoid coil. The self-contained design combines the pump, motor, oil reservoir, gas ballast, lubrication system, belt guard and cooling-water circuit in one ready-to-install package.
Manufacturer part number: 900-212-014 (also shown as 900212014 in Edwards manuals)
| Pumping Speed | Ultimate Vacuum | Motor | Electrical |
|---|---|---|---|
| 138 cfm | <25 microns Hg | 7.5 hp TEFC | 230/460 V, 3-phase |
Overview
The 212J 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.
Features and Benefits
- Industrial cast-iron and ductile-iron construction for demanding processes
- Low 500 rpm pump speed for long service life
- 138 cfm nominal pumping speed at 60 Hz
- 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 212J |
| VPS SKU | 900212014 |
| Edwards Webshop Part Number | 900-212-014 |
| Pump Technology | Oil-sealed rotary piston vacuum pump |
| Nominal Pumping Speed | 234 m³/h (138 cfm) |
| Displacement | 255 m³/h (150 cfm) |
| Ultimate Vacuum | <0.033 mbar (<25 microns Hg / <0.025 Torr), without gas ballast |
| Pump Speed | 500 rpm |
| Motor | 7.5 hp, TEFC, NEMA frame 213T |
| Electrical Supply | 230/460 V, 3-phase, 60 Hz |
| Oil-Solenoid Coil | 230/460 V |
| Motor Insulation Class | Class F |
| Vacuum Inlet | 3-inch ASA/ANSI flange |
| Vacuum Exhaust | 2-inch NPT / flange |
| Cooling-Water Connections | 1/2-inch NPT inlet and outlet |
| Maximum Cooling-Water Flow | 5.7 L/min (1.5 gpm) |
| Maximum Inlet-Water Temperature | 30 °C (85 °F) |
| Recommended Oil | Stokes V-Lube F for normal operation; V-Lube G above 71 °C operating temperature |
| Oil Capacity | 15 L (4 US gal) |
| Noise Level at 1 Meter | <77 dB(A) at ultimate pressure |
| Vibration Severity | 7 mm/s RMS |
| Net Weight | 431 kg (950 lb) |
| Shipping Weight | 488 kg (1,075 lb) |
| Floor Space | 667 x 610 mm (26-1/4 x 24 in) |
| Overall Height | 1,171 mm (46 in) |
| Operating Ambient Temperature | 12 to 40 °C (54 to 104 °F) |
Motor full-load amperage, efficiency and exact motor speed should be confirmed from the installed motor nameplate.
Performance Curve
The solid curve shows operation without gas ballast. The dashed curve shows operation with gas ballast.
Dimensions
Dimensions are shown in millimeters with inches in parentheses. Verify the current Edwards submittal drawing and installed motor arrangement before designing fixed piping or foundations.
Available 212J Configurations
| Edwards Part Number | Configuration |
|---|---|
| 900-212-014 | 230/460 V, 3-phase, 60 Hz with 230/460 V coil |
| 913-212-014 | 200-208/265/460 V, 3-phase, 60 Hz |
| 916-212-014 | 230/460 V, 3-phase, 60 Hz, Class I Division 1 Groups C & D explosion-proof configuration |
| 919-212-014 | 575 V, 3-phase, 60 Hz, CSA configuration |
| 924-212-014 | 380 V, 3-phase, 50 Hz, non-CE configuration |
| 931-212-014 | 230/460 V, 3-phase, 60 Hz with 115 V coil |
| 945-212-014 | 380 V, 3-phase, 60 Hz motor configuration |
| 970-212-014 | 230/460 V, 3-phase, 60 Hz with Water Miser |
Need a Different Voltage or Configuration?
Send us the required voltage, frequency, process gas, installation location and a photo of the pump nameplate. We will confirm the correct 212J 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: The standard hydrocarbon-oil pump is 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 212J repair kits and parts
- Stokes 429638016RK repair kit with coil
- Stokes 429638016RKB repair kit with bearings and coil
- Review Stokes V-Lube oil recommendations
- Rebuilt Stokes 212J pump option
Resources
- Edwards 212J/412J Microvac Instruction Manual - S14901880 Issue J
- Edwards Stokes Microvac Rotary Piston Pump Brochure
Specifications were compiled from Edwards S14901880 Issue J, the Edwards US webshop listing for 900-212-014 and Edwards Stokes Microvac sales literature. Specifications are subject to manufacturer revision.
