Water pumps provide a variety of essential services, from circulating hot water in industrial settings to keeping cars running smoothly. These tools vary greatly depending on the purpose for which they are intended. As such, investing in the correct water pump can be a tricky proposition, particularly for drivers or homeowners unfamiliar with the basic workings of this important tool. A basic understanding of the different types of water pumps available should be obtained prior to purchase to ensure the best product for each unique situation.
Types of Water Pumps
Although there are a variety of water pump designs, they can essentially be separated into two main categories: centrifugal and positive displacement. Both types of water pumps achieve the same result, but they use different methods to do so.
Centrifugal Water Pumps
Sometimes referred to as velocity pumps, centrifugal water pumps use flow velocity to add kinetic energy to fluid. These pumps can be safely operated while valves are closed, as they do not produce significant pressure buildups. However, they are not as adept at maintaining a constant speed as positive displacement pumps. Centrifugal pumps are ideal for use with water, although the efficiency of these pumps decreases rapidly as the viscosity of the liquid increases.
Positive Displacement Water Pumps
In order to make fluid move, positive displacement water pumps trap fixed amounts before forcing the trapped fluid into discharge pipes. The presence of both expanding and decreasing cavities allows these pumps to operate the same flow at a constant speed. Although frequently used for pumping water, positive displacement pumps can also be used for a variety of other liquids, including water with significant amounts of sediment.
Water Pump Power Sources
In addition to understanding the basic construction of water pumps, it is important to gain a basic grasp of the different types of power sources that can fuel water pumps. Certain power sources work better with certain water pump designs. Those investing in pumps may also be limited by the type of power available. After all, not all homeowners enjoy access to diesel or solar water pumps.
Fossil Fuel Water Pumps
Fossil fuels are frequently used to power water pumps, as petrol and diesel products tend to be relatively inexpensive and easy for the average homeowner or industrial professional to access. These pumps facilitate the quick transfer of high volumes of water, and are well-suited to use in fire brigades and in agricultural settings.
Electric Water Pumps
Homeowners most frequently use electric water pumps, which lend themselves well to domestic applications. Although ideal for swimming pools and boats, electric water pumps may not be capable of facilitating the quick fluid transfer required for industrial purposes.
Renewable Energy Water Pumps
Renewable energy water pumps allow users to save money on fuel, while also reducing their carbon footprint. Solar energy is a common renewable approach used for powering a variety of domestic pumps, including garden water pumps.
Selecting the Right Water Pump
Power source is an important consideration to keep in mind while selecting a water pump, but vertical suction lift, maximum head lift, and discharge capacity should also be kept in mind.
Vertical Suction Lift
Vertical suction lift involves the distance fluid must be moved from its source in order to reach the pump. A high vertical suction lift is essential for pumps used for pools and dams.
Maximum Head Lift
The vertical distances between the water source and the outlet is known as the maximum head lift. The maximum head lift capacity can have a huge impact on a pump’s efficiency.
A pump with a high discharge capacity is capable of quickly transferring fluids from the original source to the discharge outlet. Discharge capacity is a particularly important concept to keep in mind while choosing agricultural water pumps.
How to Buy a Water Pump on eBay
No matter the type of water pump required, it is easy to find a great fit on eBay. The best way to find a particular type of water pump is to conduct a keyword search. Water pumps for domestic use can also be found while browsing eBay’s “Home and Garden” page.
While searching for a water pump on eBay, it is important to look carefully at all details provided by the seller. The listing should include information about the pump’s basic structure, its power source, and its standard applications. Water pump listings with minimal information should be avoided, as they increase the potential for purchasing products not suited to the user’s specific needs. Likewise, it is important to look for highly-rated sellers to ensure the purchase of a quality pump.
The wide array of water pumps available on eBay can make it difficult to know which type to purchase. However, with a little research, it is possible to find an effective and affordable pump uniquely suited to nearly any purpose imaginable.