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Midwest Valves

    Added on 03 January

    An in-depth beginners’ guide to progressive cavity pumps

    A progressive cavity pump in Australia fits in the family of displacement pumps. The working operation principle of progressive cavity pumps is a rotor. The rotor is constructed of solid metal, and it is shaped as a helix. It rotates inside a stator that has a double cavity…



    A progressive cavity pump in Australia fits in the family of displacement pumps. The working operation principle of progressive cavity pumps is a rotor. The rotor is constructed of solid metal, and it is shaped as a helix. It rotates inside a stator that has a double cavity. The pump is mostly used for drilled downhole and petroleum applications. The progressive cavity pump is maligned as a pump of last resort. The pump is an excellent choice because it can be used to pump fluids that have a viscosity that is beyond centrifugal pumps.


    Progressive cavity pumps can also be used in applications where the fluid being pumped is shear sensitive, or the fluid is abrasive. The pump has also been used in agricultural applications to move berries and fruits with no harmful effects to the products.


    Selecting the right valve 


    It is recommended to know as much information about the fluid you want to pump as possible. This will enable you to match the speed of the pump, the size of the pump and the material of the pump to buy for your application. The pump will be more effective when the flow rate is lower than the pressure required. It is also essential to address significant concerns when selecting the pump such as the viscosity, temperature, and abrasion.


    The speed of the pump should be inversely proportional to the viscosity of the fluid. You should order a large pump from a progressive cavity pumps supplier if the abrasive properties of the pump are high A large pump will be more expensive to buy, but it will pay off quickly with a good return on the investment. A smaller and faster pump will be costly to maintain. You should choose a design that will keep the linear velocity of the fluid less than 7ft. per second if you want a wear resistant pump.


    If the fluid is abrasive, you should reduce the pressure. Most manufacturers of progressive cavity pumps limit the pressure of the fluid with an elastomer stator. A rigid stator is metallic and is sometimes used in fluids that have viscosities that exceed 2000cP.


    The heat 


    The temperature will affect the resiliency of the stator directly. It is therefore important to match the stator with the material. The expansion rate of elastomer is faster than that of metals. They expand ten times faster than metals. This means that when the temperature increases, the stator will expand. Since the exterior diameter is restricted by the metal casing, the expansion is unidirectional inward. This makes the pumping cavity to contract and become smaller. This can interfere with the pumping process and even destroy the stator. When the stator is destroyed, you can smell the burning rubber.


    Tips for reliable operation 


    You should replace the rotors in your progressive cavity pump Australia because they wear out first. You can reuse used stators by flipping them end for end. You need to replace rotors that are past chrome plating. You shouldn’t over-torque the foot bolts found around the stator because this can put your progressive cavity pump in a bind.


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