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Features Common to All Viking® Pumps
- Constant capacity regardless of pressure.
Viking positive displacement pumps provides relatively constant output regardless of
changes in pressure, making them well suited for metering applications.
- Flow proportional to speed. The pump's output is directly
proportional to its speed, allowing it to be used for metering applications
using a variable speed drive following a process control signal.
- Direction of flow is reversible. The same Viking pump may be
used for loading and unloading of tanks when used with a driver capable of
reversing direction. (Exceptions are Viking Spur Gear, which are not
bi-rotational as standard but can be made so as an option, and some Viking Mag
Drive® models).
Note that pressure relief must be provided in both directions of operation.
- Smooth, near-laminar flow. Unlike reciprocating PD pumps
(including diaphragm, piston, plunger and rotating piston principles), Viking
rotary
pumps offer smooth, non-pulsating flow which reduces friction loss and
cavitation due to acceleration and deceleration losses, reduces water hammer, and
aids in mixing two streams by eliminating slugs of fluid.
- Self-priming, with suction lift capabilities. Viking pumps are
capable of self priming when wetted, and are capable of pulling a suction
lift where positive suction head is not available.
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Viking Pumping
Principle Comparison |
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Characteristics
|
Internal Gear |
External Gear |
Rotary Lobe |
Vane Pump |
| Maximum Capacity (GPM /
M3/Hr) |
1,600 / 363 |
32 / 7.3 |
1,014 / 184 |
160 / 640 |
| Maximum Discharge Pressure (PSI /
Bar) |
250 / 17 |
2,500 / 172 |
400 / 27 |
200 / 14 |
| Maximum Viscosity (SSU / cSt) |
2,000,000 / 440,000 |
75,000 / 16,500 |
2,000,000 / 440,000 |
2,300 / 500 |
| Maximum Temperature
(° F / ° C) |
750 / 370 |
450 / 230 |
400 / 205 |
500 / 260 |
| Run-dry capability |
Yes, for a short time,
if fluid film in
pump |
Yes, for a short time,
if fluid film in
pump |
Yes, indefinitely,
with seal flush |
Yes, for a short time,
if fluid film in
pump |
| Solids Handling |
Soft solids, small size |
No |
Soft solids, large size |
No |
| Abrasives Handling |
Yes |
No |
No |
No |
| Non-lubricating fluid capabilities |
Good |
Fair |
Excellent |
Excellent |
| Shear Rate |
Low |
Medium |
Low |
Medium |
| Sanitary/Hygienic Models |
No |
No |
Yes |
No |
| No. of Shaft Seals |
1 |
1 |
2 |
1 |
| Sealless Mag Drive Models |
Yes |
Yes |
No |
No |
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