A positive displacement pump squeezes fluid by reducing the volume that contains it. One kind of this pump is the piston pump: each stroke pushes along a particular amount of fluid. An example of the rotary displacement pump is the screw pump, which utilizes two overlapping parallel screws to push a particular amount along with every single revolution.
Key applications for this category of pumps
Even though these valuable pumps feature a little bit higher maintenance requirements than other kinds, they are fundamentally much better suited for some certain applications. The applications that they are most suited for comprise;
- Low-flow/high-pressure applications: This category of pumps are normally a lot more effective when it comes to the generation of high pressure in applications in the low-flow category. Even though centrifugal pumps could be designed to also generate high pressures – normally via the utilization of multiple stages – the pumps seem to be rather expensive. Thus, it is a lot cheaper to utilize these pumps when you need high pressure to move fluids through a low-flow setup.
- High-fluid-viscosity applications: This category of pumps are a lot more effective than their centrifugal counterparts when it comes to getting viscous fluids moved from one location to the other. By getting the fluids to be pumped pressurized, this kind of pump loses a lot less energy to the stresses of high shear that are characteristic of viscous fluids. This is among the foremost reasons why you will see experts buying this type of pump for any reliable and competent positive displacement pump supplier.
- Accurately controlled flow applications: As every single revolution or stroke generates a particular amount of flow, this category of pumps is usually utilized in applications that require precise flow control. By having the number of pump cycles controlled, this type of pumps is very well suited for varying metered-flow applications.
Advantages of these pumps
Additionally, several kinds of these pumps feature certain unique characteristics that make them quite attractive. For instance, they are normally self-priming and are capable of operating with entrained gases within a suction line. This amazing feature enables designers of systems to place the pumps above the level of the fluid to be pumped, which could get the layout of the system greatly simplified. Frequently, centrifugal pumps need special system equipment and tools to be capable of priming the impeller and removing gases. Even though some kinds of centrifugal pumps are also designed to be self-priming, they also happen to be significantly costly, a lot less dependable, and a lot less efficient – and gas still has to be taken out.
Certain types of this pump – like peristatic as well as diaphragm types – do not need any seal and so don’t leak. In systems that deal with hazardous or corrosive fluids, eradicating the need for seal maintenance could yield significant cost savings.
In conclusion, these are the varying kinds of positive displacement pump that you will find out there in the market, as well as the typical applications that the amazing pump can be put to. The information that has been offered in this article should help you in choosing the most ideal pump for your application.
