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Stokes Microvac 912J

MODEL AKTUALNIE WYCOFANY Z PRODUKCJI na rzecz nowych pomp suchych GXS 

The Stokes Microvac rotary piston pump sets the standard for performance and reliability as the industrys most efficient, space-saving design. The Stokes Microvac rotary piston pump has been improved, upgraded, and fine-tuned to deliver even better dependability and productivity combined with minimal maintenance and process downtime.

An integral oil distribution system eliminates external piping and delivers leak-free operation in a stylized design. A stiffer motor mounting platform cuts flexibility to minimize motor belt wear. A stylized oil reservoir cover and side cover ‘O’ rings improve sealing to eliminate oil leakage. An integral gas ballast valve built into the side cover allows quick adaptation to automatic gas ballast.

Most importantly, these improvements don’t increase the industry leading space saving footprint. Inlet, outlet and mounting dimensions are exactly the same as the H series Microvac rotary piston pump.

This pump is fitted with a 230/460V coil for control of the oil solenoid valve which prevents the pump from flooding with oil in the case of power failure or a loss of vacuum. In addition oil temperature/heater ports have been added as standard to provide a means to monitor and heat the pump oil if required.


Features and Benefits

  • Robust cast and ductile iron construction provides proven rugged reliable operation.
  • Low 500rpm operation for longest pump life cycle.
  • Efficient design provides maximum uptime with minimal moving parts, low rotational speed and large clearance.
  • Low ultimate blank-off with pressures down to < 2.5 x 10-2 Torr.
  • New valve deck design virtually eliminates valve maintenance and noise.
  • Space saving design which saves up to 50% of valuable floor space.
  • Complete and self-contained unit delivered ready to install.
  • Automatic lubrication system provides proper flow of oil to bearings and sealing surfaces and prevents back flow into system.
  • Controlled balancing reduces vibration to a practical minimum.
  • Gas ballast as standard.
  • Total capability includes the manufacturing and service capabilities to keep your equipment in top operation with a broad range of vacuum system accessories.


  • Automotive
  • Chemical processing
  • General applications
  • Heat treatment
  • Leak detection
  • Metallurgy
  • PET processing
  • Pharmaceuticals
  • Transformer drying and cable fluid conditioning
  • Vacuum coating
  • Vacuum melting
Dane techniczne
Displacement (swept volume)(AVS) 1240 m3h-1 / 728 ft3min-1
Pumping speed 1132 m3h-1 / 670 ft3min-1
Ultimate vacuum (total pressure)  
  without gas ballast -2mbar /-2Torr
  with gas ballast -1mbar /-1Torr
50Hz Motor size 22 kW TEFC
60Hz Motor size 30 hp TEFC
Motor speed 1800 rpm
Inlet connection 6 inch ASA/ANSI flange
Exhaust connection 5 inch NPT
Cooling medium Water
Water inlet/outlet connection 1 inch NPT
Recommended cooling flow @ 85°C / 30°F 18.9 lmin-1 / (2) / 5 galmin-1
Water vapour pumping rate 27.27 kg h-1 / 60 lb h-1
Oil capacity 92 litre / 24 gal
Recommended oil V lube F
Noise level  
Weight 2495 kg / 5500 lbs