Pumps are essential in manufacturing operations and processes. They facilitate the movement of fluids or gases from one location to another, allowing industrial machinery to function more efficiently. However, not all pumps operate in the same manner. Positive and negative displacement pumps each use specific mechanisms to perform their jobs effectively. In this article, we will examine the difference between the two pumps so that you can choose the best equipment for your company’s unique needs.
Positive Displacement Pumps: Quick Facts
Positive displacement pumps move fluid by trapping a fixed amount in a cavity and propelling it forward through the system. The process is repeated continually, ensuring a smooth flow. They are generally utilized in hydraulic systems, as they can endure extreme pressure and deliver a steady, pulsation-free flow.
Positive displacement pumps are most often utilized for viscous fluids such as oils, slurries, and syrups. Their cavity design effectively handles the thickness of these specific types of fluid.
They are ideally designed for applications needing a controlled fluid flow, such as pharmaceuticals, food processing, or paint spraying equipment.
Positive displacement pumps will generally cost more than negative displacement pumps. They are comprised of more complex mechanisms that require higher precision and greater tolerance. The cavity in their mechanism can become worn, damaged, or deteriorated over time, thus requiring more maintenance to maintain efficiency than other types of pumps.
Negative Displacement Pumps: Quick Facts
Negative displacement pumps use vacuum-like centrifugal action to pull liquid into an intake and seal it before forcing the liquid out through the pump. These pumps are typically less efficient than positive displacement pumps but offer greater pressure output ratios. Negative-style pumps are best suited for thin liquids like water, chemicals, or gases, as the centrifugal action can easily push them through the pump.
Negative displacement pumps create a variable flow rate based on fluctuating centrifugal action, making them appropriate for applications such as irrigation or chemical transfer.
Negative displacement pumps are typically lower maintenance than their positive counterparts. They have fewer moving parts, meaning there is less opportunity for damage.
Because of their more straightforward and less complicated design, these pumps are often less expensive.
In Summary: Which Pump Do You Need?
When choosing between positive and negative pumps for your manufacturing operations, it’s crucial to fully comprehend their uses and applications – and the differences between the two alternatives.
Positive displacement pumps move a fixed volume of fluid, while negative pumps use centrifugal action to compel fluids through the pump mechanism. The type of fluid, flow rate, maintenance requirements, and cost of purchase and ownership are all vital considerations when selecting the appropriate pump. Understanding these criteria will make making an informed decision much easier.
When you call Zwirner Equipment, you can rest assured that you will have the expert guidance you need to choose the best manufacturing equipment for your unique application. Whether you know exactly what you need and simply wish to browse our inventory, or you want to speak with a member of our team, we are here for you.
Zwirner sells quality reconditioned stainless steel equipment, tanks, and parts to a wide range of industries. We specialize in food processing, breweries, dairies, chemical and pharmaceutical processing, and more. Whatever your application and needs, call us today.
