Positive VS. Non-Positive Displacement Pump
When it comes to choosing the right industrial pump to match your expectations, it is very important to be aware of which type of pumps you are using for your industrial needs and if they are suitable or not. There are similarities and important differences between positive & non-positive displacement systems. Let us know the actual difference between them. What is a Positive Displacement Pump? A positive displacement pump provides a constant flow at fixed speed, regardless of any change in the pressure. The pump transfers the fluid by trapping a fixed amount and forces the volume into the discharge pipe. The liquid flows into the pump when the cavity on the suction side opens or expands, whilst the liquid flows into the discharge when the cavity closes or decreases. Through every cycle of operation, the volume is the same. These are some examples of positive displacement pumps: ● Diaphragm Pumps ● Helical Rotor or Progressive Cavity Pumps ● Peristaltic Hose Pumps ● Piston Pumps ● Rotary Lobe or Gear Pumps
What is a Non-Positive Displacement Pump? A non-positive displacement pump’s output flow rate can be changed in response to the pressure on the outlet. This Pump uses Newton’s first law of motion to transfer fluid against the system resistance. Although it provides smooth and continuous flow - its flow output is reduced when system resistance is increased. Non-positive pumps have their own problems related to fluid