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Product code: DH/JH

Nova Rotors DH-JH Progressive Cavity Pump with hopper

Pump Type - Progressing Cavity

Max Flow Rate - 600M³H

Max Head - 480M

Max Temp - 150°C

Max Viscosity - 1,000,000 cst

Max Solid Passage - 30mm

Self Priming - Y

Pump Materials - AISI304, AISI316, Cast Iron, Duplex

Inlet/Outlet Sizes - 25mm to 300mm

Drive - AC Electric, Bareshaft

Max Suction Lift - 8M

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DESCRIPTION

Nova Rotors DH/JH Progressive Cavity Pump with Hopper


Flow Rate

Up to 600m³/hr

Head (Pressure)

Up to 48 bar

Sizes Available

From 025 to 300

Operating Temperature

-40°C to 150°C

Viscosity

Up to 1,000,000cp

Drive Options

Electric Motor, Hydraulic Motor

 

 

The Nova Rotors DH/JH progressive cavity pump is fitted with a hopper that feeds the product into the pump,  this is the standard version with a rectangular hopper. The hopper length is customisable depending on the application requirements. This series is designed to handle high viscosity sludge and fluids with a high concentration of dry matter. This helical rotor pump is excellent at transferring products that do not flow well under gravity and contain up to 18% dry solids content. There is an auger screw within the hopper that is driven by the motor, it rotates and helps the product flow into the pump to ease the pumping process.


There are two main versions of this progressive cavity pump series, each distinguished by how the motor is coupled to the pump. For the DH type, the motor is directly coupled to the pump to ensure a compact and easy maintenance design. The JH type is long coupled where a flexible coupling is installed between the pump and motor. The JH type is more robust as all the forces during pumping are absorbed by the bearing housing rather than the motor.


The casing of this positive displacement pump can be constructed from various materials including cast iron, stainless steel 304, stainless steel 316 and duplex stainless steel. The rotor is available in  stainless steel 420, 304, 316 and duplex, while the stator can be supplied in NBR, EPDM, FPM, HNBR, Hypalon and PTFE. Such a wide range of material choices makes this pump series extremely versatile and capable of pumping a vast range of fluids.


Sealing options for this helical rotor pump include gland packing, gland packing with flushing, single mechanical seal, single mechanical seal with quench, double mechanical seal, single or double cartridge seals and API rated sealing systems.


This progressive cavity pump is Atex certified for handling flammable fluids and installation in non-safe areas. API 676 certification is also available if required.


This progressive cavity pump is ideal for many applications in the industrial and marine markets, including; sewage sludge, dehydrated sludge, fish waste, paste, water treatment, industrial sludge, detergents, paper pulp, bio-waste, marine and agriculture.



Product summary

 

                      Fitted with customisable rectangular hopper feed for handling products with up to 18% dry matter

                      Close coupled and long coupled variations

                      Wide range of material options

                      Modern sealed stator design, no o-ring required

                      Modern rubber sleeve design to improve resistance to abrasive solids

                      Numerous sealing options, including; gland packing, gland packing with flushing, single mechanical seal, single mechanical seal with quench, double mechanical seal, single or double cartridge seals and API rated sealing systems.

                      Can handle viscous fluids up to 1,000,000cp

                      Incorporated bearing lubrication system

                      Excellent self-priming capability

                      Reversible flow up to 3 bar as standard, Up to 12 bar with hydraulic balance

                      Excellent at pumping fluids containing solids in suspension

                      Excellent for shear sensitive fluids due to low pulsations

                      Single phase and three phase 50hz / 60hz motors

                      Marine certification available

                      ATEX, API676, food grade EHEDG certifications available

                      Various accessories available, including; dry running protection, bypass valve, control panel, inverter, heating jacket, grinder and others on request

 

Read how Progressing Cavity Pumps work and the types available in our Guide

FAQS

No, definitely not! Progressive pumps will incur damage even after short periods of dry running. Firstly, the stator and rotor require lubrication from the pumped fluid. Dry running without these will cause fast and irreversible damage. The mechanical seal requires lubrication and cooling while the pump is operating. Without the presence of fluid, the mechanical seal will overheat and crack, and this may cause the pump to leak and fluid to enter the motor. There is also the possibility that the motor will burn out. Our advice is to ensure that the pump always has access to fluid while running, the vessel or sump on the inlet side of the pump must never run out of fluid while the pump is active. Level sensors or a float switch can be installed in the fluid chamber ensuring that the pump is turned off in the event there is no fluid. Another way of protecting the pump is to fit a dry running device, this will turn the pump off if it detects that no fluid is entering the pump. If you think that dry running is inevitable, then please speak to us and we will try to select a more suitable pump for your application.
A pump must be primed in order to operate correctly, this means that the pump casing and inlet pipe must be filled with fluid and the air removed before operation. This needs to be done manually by the pump operator for a non-self-priming pump each time the pump is used to avoid damage from dry running. A self-priming pump removes these issues by completing the priming process automatically. The air is removed from the inlet pipework and pump casing when the pump is activated. Self-priming pumps are particularly useful for installations with a suction lift on the inlet side of the pump, the pump will draw the fluid up the pipework by creating a vacuum and removing any air that is present. In ideal conditions, a self-priming pump can lift fluids up to around 8m on the inlet side, however this figure is affected by fluid viscosity, pipework bore and other installation conditions, therefore this figure can be much lower from case to case. Allowances must also be made for wear and tear; suction lift capabilities will be much lower for older and worn pumps.
Please be aware that the figures displayed relate to the largest pump from this range of products, not specific models. For details on viscosity for specific models, please refer to datasheets or contact a member of our sales team.
Please be aware that the figures displayed relate to the largest pump from this range of products, not specific models. For details on solids passage and dry matter content for specific models, please refer to datasheets or contact a member of our sales team.
A hopper is a wide opening at the top of the pump, it is designed to help feed viscous, sticky, dry, pasty and solids laden fluids into the pump easier than just via standard pipework. Our hoppers are customisable; they can be manufactured to various shapes and sizes, they can also be fitted with various types of feeding systems, including auger screw and paddle.
A clear picture of the pump system is required to make an accurate selection. The main pieces of information required include; a description of the application, bore of pipework, the fluid, viscosity, size and type of solids, flow rate and pressure/head. With these pieces of information, a pump can be sized correctly to ensure it delivers the required flow rate and pressure and that is also operates at its best efficiency point to lower lifetime costs. Knowing if the pump is running intermittently or continuously also allows the correct motor speed to be selected. For instance, a pump running continuously 24/7 will require a slower speed motor rather than a full speed motor. Running the motor slower and oversizing the pump will reduce wear of the motor and the pump, therefore lowering maintenance costs during their lifetime.
Firstly, always check the compatibility of the materials available against the fluid being pumped. The main materials to check are the pump casing, stator, rotor, o-ring and mechanical seal. It may be that more than one material is suitable for your fluid and selection could be based on the application type. If it is a simple transfer application with a clean fluid, then the most cost-effective material will be best. However, if it involves more complex variables such as high temperature and abrasive solids then other materials will need to be considered.
An integral bypass is designed to protect the pump and system from overpressure for small periods of time. It is typically set to around 10% higher than the working pressure, it will open and recirculate the fluid inside the pump head when the set pressure is achieved. An integral bypass is only a temporary solution and cannot operate indefinitely, an additional external bypass that runs back to the fluid source is always recommended as a more permanent solution.
ATEX is an abbreviation of “Atmospheres Explosibles”. It is a regulation set out by the European Union to ensure the safety of products that are used to handle flammable products or are installed in environments containing flammable gases, vapours, mists or combustible dusts. For instance, if the pump is being installed in an explosive environment, then only the motor needs to meet the Atex standard stopping it from causing a spark during operation and igniting the atmosphere. However, if the fluid being pumped is flammable, then the pump will also need to meet Atex standards to ensure that no sparks are caused inside the pump itself when the fluid goes through it. It is crucial that an Atex rated pump or motor are used for applications involving explosive environments or flammable fluids, using a non-Atex pump or motor in these situations is extremely dangerous and contravenes health and safety standards.
NPSH is an acronym for Net Positive Suction Head. NPSH measures the absolute pressure present in a fluid.

There are two main ways that NPSH is expressed in a pump system

NPSHa - This is the amount of Net Positive Suction Head available at the pump inlet. NPSHa demonstrates the amount of pressure acting on a fluid as it enters the pump. This measures the amount of pressure between the liquid staying in its current state and forming vapour bubbles (beginning to boil).

NPSHr - This is the amount of Net Positive Suction Head that the pump requires to operate without experiencing the damaging effect of cavitation, thus causing a dramatic reduction in pump performance.

It is very important to pay attention to these values when making a pump selection. Selecting a pump that requires more NPSH than is available in your system will cause fast and long-lasting damage to the pump and thus you will incur large repair costs and downtime.

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