| essity of the automatic pump is often overlooked | | | | Axial Pumps are also known as propeller pumps |
| in society, as it is not obviously apparent to the | | | | because they lift liquid much like a copter propeller |
| average person. This technological advance has | | | | lifts air. Low-pressure irrigation and storm water |
| made many industrial and civil labors more | | | | and wet-pit drainage applications typically employ |
| accessible and convenient and certainly more | | | | axial pumps, which can also be altered for |
| efficient. Basically designed to raise or transfer | | | | siphoning purposes. Though they tend to function |
| fluids, their applications include: irrigation, drainage, | | | | in a single-stage manifold, two-stage varieties are |
| and sewage. They are also often attributed to | | | | also common because they can be more |
| the chemical, petroleum, medical, and mill | | | | economical. |
| industries. Although there are many specialty | | | | There are four types of pumps that categorize |
| subcategories, there are really only two types of | | | | Positive-Displacement pumps: Rotary, |
| pumps that encompass the others. | | | | Reciprocating, Metering, and Moyno Pumps. |
| These are known as Dynamic Pumps and | | | | Specifically geared towards smooth liquids, Rotary |
| Positive-Displacement Pumps. High liquid velocity | | | | Pumps are simple in design and are not directly |
| that is converted into pressure while inside a | | | | influenced by pressure changes. |
| passage that diffuses flow is characteristic of | | | | Cam-and-piston, vane, lobular, internal-gear, and |
| Dynamic pumps. Less efficient than the latter | | | | screw are all common classifications of Rotary |
| category, they are easier to maintain and run at | | | | Pumps. Reciprocating pumps pull a metered |
| higher velocities, especially when involved with | | | | quantity of liquid through the intake valve into the |
| electric motors and steam turbines. | | | | cylinder and expels it using positive pressure |
| The Positive-Displacement type, however, pushes | | | | through the proper expulsion conduit. |
| a controlled quantity of liquid from the intake to | | | | They are frequently used for clean servicing of |
| the exhaust. Generally known to be larger and | | | | slurry or sludge. Metering Pumps are incredulously |
| stronger than the other, they can be easier to | | | | exact, controlling the low flow rates of up to |
| control, and accordingly can produce an infinite | | | | one-half gallon per minute. This allows them to |
| stream of pressure if needed. | | | | regulate the additives that get into the main flow, |
| Dynamic Pumps break down in to two very | | | | intending them for clean service. Alternately |
| specific subcategories. Centrifugal Pumps consist | | | | known as controlled-volume or proportioning |
| of an impeller coupled with an intake system. | | | | pumps, they consist of the diaphragm and |
| Used in eighty percent of the world's production, | | | | pack-plunger style. Moyno Pumps are less |
| these are easily the most popular because they | | | | common, perhaps because they are specifically |
| can process high-volumes of liquid at an efficient | | | | design for the movement of solids. In fact, they |
| rate of transfer also keeping costs low. The | | | | transfer solids with such precision that they're |
| vanes of the impeller turn and pull liquid into the | | | | movement is incredibly smooth, which prevents |
| enclosure, which then converts the velocity into | | | | most of the physical damage to sensitive |
| the pressure it needs to expel the liquid. | | | | substances that other pumps would cause. |