Volute case is a critical component of a centrifugal pump - Hebei Yuanda Trade Co., Ltd

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The volute casing pump is the most common type of centrifugal pump. Its characteristic feature is the volute-shaped pump casing which is typical for single-stage centrifugal pumps.There are designs whose main dimensions are standardised in accordance with EN 733, ISO 2858 and ISO 5199, but this standardisation still leaves ample room for many design variants.

Volute pumps are used in a wide variety of applications. The applications where Power Zone uses volute pumps the most are Mine Dewatering, Oil & Gas Refineries, Midstream and Pipelines, Water Injection, Power Generation Boiler Feedwater, Manufacturing and general Water Transfer. Volute pumps are very common in every industry.

A pump casing is often referred to as a volute. A volute is a spiral-like geometry with an increasing through-flow area, reducing the velocity of the fluid and increasing the static pressure. The fluid exiting the impeller is then diffused towards the casing discharge nozzle. These volute casings come in two different types: single volute and double volute.

It is a common misconception in the U.S. pump industry that the function of the volute is that of a diffuser: to convert velocity into pressure. I have recently read and heard statements to this effect by centrifugal pump authorities. Igor Karassik said that the “velocity is converted into pressure energy by means of a volute.” Walter K. Jekat said that the “most popular…diffusion system…for centrifugal pumps is the volute.” The McGraw-Hill scientific dictionary [5] states that a volute is “a spiral casing for a centrifugal pump…designed so that speed will be converted to pressure.”

Each centrifugal pump is made of hundreds of parts. There are a few components that virtually every centrifugal pump has in common. These components can be subdivided into the wet end and the mechanical end.The wet end of the pump includes those parts that determine the hydraulic performance of the pump. The two primary wet ends are the impeller and casing. In some cases, the first radial bearing can be water lubricated. In this case, also bearing can belong to wet ends.

The working principle of centrifugal pumps is based on adding energy to the working medium using a rotating impeller. This process, in addition to increasing the static pressure, also increases the velocity of the fluid. The added energy in the form of velocity (or dynamic pressure) can be partially converted into static pressure by properly slowing down the fluid. This is often done by using a volute , which is a spiral-formed casing around the impeller, collecting and guiding the fluid towards the discharge pipe while gradually decreasing its velocity.

A volute is a curved funnel that increases in area as it approaches the discharge port.[1] The volute of a centrifugal pump is the casing that receives the fluid being pumped by the impeller, maintaining the velocity of the fluid through to the diffuser. As liquid exits the impeller it has high kinetic energy and the volute directs this flow through to the discharge. As the fluid travels along the volute it is joined by more and more fluid exiting the impeller but, as the cross sectional area of the volute increases, the velocity is maintained if the pump is running close to the design point. If the pump has a low flow rate then the velocity will decrease across the volute leading to a pressure rise causing a cross thrust across the impeller that we see as vibration. If the pump flow is higher than design the velocity will increase across the volute and the pressure will decrease according to the first law of thermodynamics. This will cause a side thrust in the opposite direction to that caused by low flow but the result is the same – vibration with resultant short bearing and seal life.

In summary, a volute case is a critical component of a centrifugal pump, responsible for converting kinetic energy into pressure energy as fluid moves through the pump. Its design, material, and quality are essential factors that impact the efficiency and performance of the pump.

The pump volute casing is the most common type of centrifugal pump. Its characteristic feature is the volute-shaped pump casing which is typical for single-stage centrifugal pumps. The pump volute casing is specially designed to constrict the fluid from the pump inlet, direct it into the impeller and then slow and control the fluid before discharge. A pump volute casing is a curved funnel that increases in area as it approaches the discharge port. The volute of a centrifugal pump is the casing that receives the fluid being pumped by the impeller, maintaining the velocity of the fluid through to the diffuser. As liquid exits the impeller it has high kinetic energy and the volute directs this flow through to the discharge. As the fluid travels along the volute it is joined by more and more fluid exiting the impeller but, as the cross sectional area of the volute increases, the velocity is maintained if the pump is running close to the design point. 

Pump volute, a crucial design element in centrifugal pumps, with its delicate internal structure and clever combination with Bernoulli’s principle, not only provides an external shield for the pumping system, but also plays an indispensable role in the conversion of liquid energy. Its spiral shape, gradual expansion and synergy with the pump vanes make it a masterpiece of fluid mechanics.as an expert in air operated diaphragm pumps and other fluid transfer pumps, offers not only magnetic pumps and centrifugal pumps, but also air operated diaphragm pumps, filter press feed pumps, progressive cavity pumps and chemical pumps, etc., please feel free to contact us.

A volute centrifugal pump is a machine that moves liquids in a style circular a spiral-like casing called a volute. It is used in different industrial sectors, including agriculture, construction, and mining.

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