Talk to the team at Global Pumps today about our air diaphragm pumps , or browse through our website to find out more about our other pumping solutions , including peristaltic hose pumps , wine pumps , and more. Helical rotor pumps have a long tubular profile and contain a single rotor with a screw-shaped rotating element. This is held with a moulded stator - typically constructed from rubber or some other tough polymer.
A positive displacement action draws the fluid into the stator, and the rotor applies radial motion. The engine or motor provides the required rotational energy.
An inlet port and outlet bookend the rotor and deliver the fluid within churning or damaging the material. Global Pumps understand how important it is for you to receive your order as quickly as possible. The helical rotor pumps offers precision machines single external helix metallic rotor, and a double internal helix elastomer stator. They offer a smarter shaft sealing, tough bearings, improved pump housing and tapered entry stator. The helical rotor pump offers operators the following benefits: self-priming, non-clogging, low NPSH requirement, low internal velocity, silent running and separate bearing housing.
They also offer reduced thrust loads on bearing and universal joins, ensuring an increasing service life. Positive displacement pumps all pulsate, meaning that their volume flow within a cycle is not constant.
The variation in flow and speed leads to pressure fluctuations due to resistance in the pipe system and in valves. The SEEPEX CS series are helical rotor pumps designed for food grade applications where cleanliness, sterilization and hygiene are of the upmost importance. They are self priming and designed for use in the food, beverage, pharmaceutical, cosmetics and personal care industries.
The D series are helical rotor self priming metering pumps that can be utilised in nearly all industries where metering and dosing of precise quantities is required. The Seepex N series are helical rotor pumps which are responsible for pumping liquids of different viscosities with or without solids.
These can be abrasive or even corrosive liquids. They are highly efficient, self priming, easy to maintain, leave a minimal footprint and have low life-cycle costs.
The T series of Seepex pumps are used for viscous media that have only little or no flowability. Positive displacement pumps are characterised by an operation that moves fluid by trapping a fixed volume and forcing that trapped fluid into the discharge pipe. As the rotor turns inside the stator, it forms a set of fixed-shaped cavities that progress along the length of the stator and force the fluid inside to move along with them as they turn. Its low internal velocity design means that viscous fluids and those containing solids can be handled effectively e.
In addition, the stator has some flexibility reducing the wear particles cause as the come into contact. This is this reason why a mono pump is often selected over centrifugal pumps; a design most suited to water or fluids with a similar thickness, or vane and gear pumps that would simply clog with the presence of solids due to their close tolerances.
Smooth, low pulsating flow - As the fluid progresses through the overlapping cavities steadily at a predictable rate, the progressive cavity design benefits from low pulsation pumping. This smooth operation means that in dosing applications, extremely accurate metering can be carried out.
Less pulsations in the flow of fluid also limits the amount of stress the other components in the installation are put under. Low shear operation — Thanks to the low internal velocity compared to other pump designs, the progressing cavity pump results in low levels of shearing being applied to the pumped medium. This makes it ideal for handling shear sensitive products that need to maintain their structure during the pumping process.
Another example of shear sensitive products are thixotropic fluids; those that are thick when static but become less viscous when shaken, agitated or stirred e. Thanks to their low RPM and gentle pumping motion, progressing cavity pumps keep agitation of the pumped medium to a minimum.
Constant flow - As a progressive cavity pump is able to produce the same flow rate regardless of the viscosity of the medium being pumped, they are an ideal solution for when a constant flow is required but the thickness of the fluid may be variable.
High pressures — High pressures can be achieved with eccentric screw pumps, ensuring that even difficult to pump fluids can be pump over considerable distances. Great suction lift capabilities — The progressing cavity mono pump design benefits from a low Net Positive Suction Head LPSH , which means that less inlet pressure is required for the pump to operate at the required duty point.
Consequently, they are a good solution when the suction conditions of an application are not ideal. Given the above design benefits, progressive cavity pumps are commonly used, but are in no way limited to the following applications:.
Progressing cavity pumps are identified by their long, thin construction as the stator is often about ten times as long as its width as per the image to the right. This means that generally quite a large amount of space is required within the installation, which is sometimes a drawback. Models are available with a more compact design however this is usually at the cost of the maximum pressures they can work at.
It is important to note that progressive cavity pumps must be selected carefully for the temperature of fluid and are not a good solution where temperatures vary significantly.
The stator and helical rotor can sometimes only have a few mm of clearance to enable the pump to be efficient and transfer fluids at the requested flow rate. As the stator is rubber, large temperature fluctuations can cause a slight swelling meaning a difference in efficiency, flow rate and pressure will be experienced. Eccentric screw pumps will be typically sized to the requested flow and pressure at a certain temperature and should this change then it is possible for the pump to still work but at reduced efficiency.
Progressive cavity pumps are a robust and reliable design, yet as with anything issues can occur. Should you experience a problem there is a likely explanation which can be identified using the below progressing cavity troubleshooting table.
If from reading the above it sounds as though a progressing cavity pump is indeed what you are looking for, take a look at our range of pumps.
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