Positive Displacement Pumps

Positive Displacement Pumps Highlights
Positive displacement pumps pressurize fluid utilizing a collapsing volume action Have a fixed displacement volume Flow rates are directly proportional to their speed The pressures they generate are determined by the system’s resistance to flow Make up approximately 15% of industrial process pump industry Effective at generating high pressure in low-flow applications Simple to operate and maintain Handle a wide viscosity range (Low and High viscosity fluids) Advantage over centrifugal pump when pumpage is highly viscous (by directly pressurizing fluids, PD pumps use less energy) Sliding vane technology is exceptional on thin and low-lubricity fluids (LPG, Refrigerants, Solvents, Fuel Oils, Gasoline, Liquid Carbon Dioxide) Sliding vane technology is exceptional on non-lubricating liquids (thick and thin) Sliding vane technology is better in shear-sensitive applications than many other PD designs and centrifugal pump technologies Typically more efficient than centrifugal pumps... in some cases significantly more efficient Lower overall cost of ownership than centrifugal pumps (based on LCC) Possibly higher initial (purchase) cost Typically lower energy costs – many times significantly lower	Rotary PD designs minimize pulsation as compared to reciprocating technologies Sliding vane and gear technologies exhibit little to no pulsation Dry Run, self-priming and superior suction lift capabilities Can operate with entrained gases in the pumpage Pumps or suction piping can be placed above the fluid level to simplify layout Well suited for metered-flow applications Sealless options available – (eliminate leaks when handling high-value chemicals, hazardous or corrosive liquids to yield substantial cost savings and safety) Magnetically coupled/drive pumps Eccentric disc pumps Peristaltic hose pumps Air diaphragm pumps Designed for high efficiency that results in high reliability and energy savings High volumetric efficiency Self-adjusting vanes on sliding vane pumps eliminate the energy-robbing slip caused by wear; maintain near original efficiency throughout the pump’s operating life High mechanical efficiency

Positive Displacement Pumps Highlights

Positive displacement pumps pressurize fluid utilizing a collapsing volume action
- Have a fixed displacement volume
- Flow rates are directly proportional to their speed
- The pressures they generate are determined by the system’s resistance to flow
Make up approximately 15% of industrial process pump industry
Effective at generating high pressure in
low-flow applications
Simple to operate and maintain
Handle a wide viscosity range (Low and High viscosity fluids)
- Advantage over centrifugal pump when pumpage is highly viscous (by directly pressurizing fluids, PD pumps use less energy)
- Sliding vane technology is exceptional on thin and low-lubricity fluids (LPG, Refrigerants, Solvents, Fuel Oils, Gasoline, Liquid Carbon Dioxide)
- Sliding vane technology is exceptional on
  non-lubricating liquids (thick and thin)
- Sliding vane technology is better in shear-sensitive applications than many other PD designs and centrifugal pump technologies
Typically more efficient than centrifugal pumps...
in some cases significantly more efficient
Lower overall cost of ownership than centrifugal
pumps (based on LCC)
- Possibly higher initial (purchase) cost
- Typically lower energy costs – many times significantly lower

Rotary PD designs minimize pulsation as compared to reciprocating technologies
- Sliding vane and gear technologies exhibit little to no pulsation
Dry Run, self-priming and superior suction
lift capabilities
- Can operate with entrained gases in the pumpage
- Pumps or suction piping can be placed above the fluid level to simplify layout
Well suited for metered-flow applications
Sealless options available – (eliminate leaks when handling high-value chemicals, hazardous or corrosive liquids to yield substantial cost savings and safety)
- Magnetically coupled/drive pumps
- Eccentric disc pumps
- Peristaltic hose pumps
- Air diaphragm pumps
Designed for high efficiency that results in
high reliability and energy savings
- High volumetric efficiency
  - Self-adjusting vanes on sliding vane pumps eliminate the energy-robbing slip caused by wear; maintain near original efficiency throughout the pump’s operating life
High mechanical efficiency

Positive Displacement Pumps

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