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Internal Gear Pump
   
External Gear Pump
   
Rotary Lobe Pump
   
LVP Vane Pump
   
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Common Features
   
Capability Performance Chart
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
:: VIKING :: Back
Comparison Chart
Features Common to All Viking® Pumps
1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
 
Viking Pumping Principle Comparison
Characteristics
Internal Gear
External Gear
Rotary Lobe
Vane Pump
Maximum Capacity (GPM / M3/Hr)
1,500 / 345
32 / 7.3
820 / 184
160 / 640
Maximum Discharge Pressure (PSI / Bar)
250 / 17
2500 / 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)
700 / 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, with hardened parts
No
No
Yes
Non-lubricating fluid capabilities
Good
(with non-metallic idler)
Good
(with non-metallic gears)
Excellent
Good
Shear Rate
Low (run at slow speeds)
Medium
Low
Low
Sanitary/Hygienic Models
No
No
Yes
No
No. of Shaft Seals
1
1
2
2
Sealless Mag Drive Models
Yes
Yes
No
No