BVL series

Technical data: 

Discharge sizes from 1.5″ to 14″

1 up to 500 HP

Flows up to 12,000 GPM

Heads up to 560 ft

Working pressure 175 PSIG

Fully enclosed, dynamically balanced impeller

Standard features: 

Same-size suction / discharge connections

Short shaft design

Small installation footprint

Low / reduced noise


Air conditioning

Condensed water

Chilled water

Service water

Cooling towers


General industry




Vertical in-line pumps are a popular type of centrifugal pump on the market. This is because they are highly efficient at transferring fluids that have a wide range of flows and pressures.

Pump Design Principles

Vertical in-line pumps are also known as cantilever pumps. They have a specially designed shaft and bearing support system that allows the pump’s volute to stay in the pump, while at the same time, the bearings remain on the outside of the pump.

There are two main types of in-line centrifugal pumps: the horizontal in-line and vertical in-line. In horizontal pumps, the shaft is configured horizontally, whereas in vertical pumps, this shaft is configured vertically.

Pump Components

Being an in-line pump, the vertical centrifugal pump has a connection between the suction and discharge designed in line with each other. This contrasts with end-suction pumps where the connection between the discharge and suction require a change of direction.

The two main components inside a vertical in-line pump are the volute assembly. The volute is a stationary casing in the shape of a curved funnel that increases in area as the fluid passes through. It receives fluids that have been pumped by the impeller to slow down the fluid’s rate of flow.

The second principal component in vertical in-line pumps is the rotating element, or the impeller. These are usually made of iron, aluminum, steel or brass. Their primary purpose is to aid in energy transfer between the pump’s motor to the fluid inside the pump. This is done by pushing a stream of energy to accelerate the fluid outwards from the center.

Why Choose Vertical In-Line?

The advantage to having a vertical in-line pump is a significant amount of space saved, as the pipe elements are stacked on top of one another. This differs with horizontal in-line pumps where the pump’s horizontal configuration of suction and discharge points take up a lot of floor space. This makes vertical in-line pumps ideal for places where the ground area is limited.

Another advantage of vertical in-line pumps is the simplified piping system in its design. This is due to the lack of directional changes required in the fluid flow inside the pump.

Vertical in-line pumps have a versatile system where the net positive suction head, or NPSH, can easily be increased. The NPSH is a measure of the absolute pressure at the suction port of the pump, which is known as the NPSH available, while the NPSH required is a measure of the minimum pressure required at the suction port of the pump to prevent cavitation.

This is highly beneficial, as that cavitation will cause the formation of air bubbles leading into the pump, which can implode and trigger shockwaves inside the pump, thus effectively destroying the pump. When the NPSH can be easily raised to meet the pressure required to prevent cavitation, this makes the vertical in-line pump easy to maintain in the prevention of cavitation.

Vertical in-line pumps are highly efficient at working with higher temperature or higher pressure fluids. They can be used in operations where the fluid in a piping system needs to be pressurized, such as for hot water circulation in commercial buildings where they can increase the pressure of the water flowing inside the pipes. Another application for vertical in-line pumps is for farmland irrigation, as the water can be boosted from a well or other water source and flow toward crops.

Like all centrifugal pumps, vertical in-line pumps can function for long periods of time when regular care and maintenance are performed, and when they are installed correctly. All Mahan pumps have been properly serviced before they are delivered and can be put straight into operation once they arrive.

Our BVL Series of vertical in-line pumps operate at a range of 1 to 500 horsepower and can handle flows up to 12,000 gallons per minute. A vertical in-line pump can be used in a wide variety of industries including wastewater, plumbing and HVAC.

Check our selection of pumps or give us a call if you need maintenance or cleaning. If you can’t find what you are looking for, don’t hesitate to contact us. Our team of experts will help you find the right solution.

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