Micropump GN Series Installation, Operation and Warranty Information - Manual (Page 8)

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DOC No: 7046 REV G
Centrifugal Pump – Series CA
The Series CA are centrifugal pumps fabricated of 316 Stainless Steel or Hastelloy C.
Bearings are Teflon, PPS or PEEK. Static seals are Teflon or Viton.
Centrifugal pumps are rotating, dynamic pumps. The pump is magnetically coupled
to its driver. The driven magnet is fixed to the impeller. Rotation of the hub magnet
by the drive causes the driven magnet and impeller to rotate synchronously around a
non-rotating shaft. Fluid enters the axially located inlet port and is accelerated by the
impeller to the tangentially located outlet port.
Pressure is developed in the pump by restrictions on the outlet, which causes the
impeller to load against the thrust plate. The magnet cup, formed from 316 SS
or Hastelloy C, provides a pressure boundary between the pumped fluid and the
surrounding environment.
Description
Cavity Style Gear Pumps - Series GAT, GD, GJ, GK, GL, GM, GN
Cavity-style gear pumps are rotating positive displacement pumps. The main pump
components are fabricated of a variety of machined metal components, the gears and
bushings are molded or machined from plastics, and a variety of perfluoromers and
elastomers are used for the static seals. There are no dynamic seals. These pumps
are magnetically coupled to their drive. The driven magnet is fixed to the driving gear
shaft . Rotation of the hub magnet by the drive causes the driven magnet and driving
gear to rotate synchronously. The magnet cup provides a pressure boundary between
the pumped fluid and the surrounding environment. Fluid enters the inlet port and is
swept by the gears around the cavity to the outlet port. Pressure is developed in the
pump by restrictions on the outlet, which load the gears against the cavity and the
shafts against the bushings. In most cases, the pumped fluid provides the cooling
and lubrication for the bushings. Some pumps are fitted with an internal bypass. By
setting the spring tension in the bypass assembly, the discharge pressure can raise the
bypass poppet recirculating fluid to the inlet side of the pump. Pumps without bypasses
can be operated in reverse direction with degradation in performance and reduction in
life. Contact your local Micropump distributor or contact Micropump directly for pumps
designed to operated continuously in reverse direction.
Suction Shoe Gear Pumps - Series GA, GAH, GAP, GB, GC
Suction shoe gear pumps are rotating positive displacement pumps. The main pump
components are fabricated of a variety of machined metal components, the gears and
suction shoes are molded or machined from plastics, and a variety of perfluoromers and
elastomers are used for the static seals. There are no dynamic seals. These pumps
are magnetically coupled to their drive. The driven magnet is fixed to the driving gear.
Rotation of the hub magnet by the drive causes the driven magnet and driving gear to
rotate synchronously around a non-rotating shaft. The magnet cup provides a pressure
boundary between the pumped fluid and the surrounding environment. Fluid enters
the inlet port and is swept by the gears around the cavity to the outlet port. Pressure is
developed in the pump by restrictions on the outlet, which load the gears against the
suction shoe and shafts. In most cases, the pumped fluid provides the cooling and
lubrication for the bearing area. Initial start up of the pump is facilitated by a spring
or ball that holds the suction shoe in place until differential pressure across the shoe
dominates the load on the shoe. Some pumps are fitted with an internal bypass. By
setting the spring tension in the bypass assembly, the discharge pressure can raise the
bypass poppet recirculating fluid to the inlet side of the pump.