What is Positive Displacement Pump?

It is a pump that reciprocates or rotates in a pump body by means of a piston, a plunger, a diaphragm, a gear or a van, etc. to periodically change the volume of a plurality of working chambers in the pump body, and alternately suck and discharge the liquid.

How pumps works?

How to choose a right pump for your applications?

For high density, viscosity or temperature liquid products, many end users prefer to screw pump, gear pump, diaphragm pump or piston pump, they usually face below problems

SCREW PUMP

• The pump body is too long and site requirement is high
• Sensitive to fluid containing solid particles
• Heavy damage might be caused due to dry run
• Sensitive to the change of viscosity
• The fluid may leak out of the pump body and cause pollution to the environment and the pump body
• Frequent to change wearing parts
• Maintenance is inconvenient

GEAR PUMP

• The inter-tooth groove of the end cap and gear constitutes a number of fixed sealing working chambers, which can only be used as a dosing pump
• Unbalanced radial force, large flow artery, high noise
• Low efficiency, poor interchangeability of parts, difficult to repair after wear

DIAPHRAGM PUMP

• The diaphragm is easy to get damaged and the frequency of maintenance is high
• Not suitable for pumping fluid
• containing solid particles with large diameter
• Not suitable for handling high viscosity or high concentration media
• The fluid may leak out of the pump body and cause pollution to the environment and the pump body
• Too many pipe elbows and valves may make the delivery pressure to be insufficient

PISTON PUMP

• Big size, high power consumption and high cost
• Sensitive to solid particles
• Heavy damage might be caused due to dry run
• The fluid may leak out of the pump body and cause pollution to the environment and the pump body
• Maintenance is inconvenient

ROTARY LOBE PUMP

For a pump with low maintenance, failure rate, easy maintenance and long-life, usually BONVE rotary lobe pump will be your best choice.

Strength of BONVE pump

• Wide pressure and flow range
• High viscosity liquid transfer, up to 1.5 million cps.
• Gap is kept between the rotors to allow no friction, thus to ensure long service life.
• Simple installation and disassembling easy maintenance and cleaning, strong resistance to wearing.
• High efficiency and energy- saving, stable transmission, low failure rate, good sealing and low noise.
• Suitable temperature:1~250c degree.