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Product code: DHE

Nova Rotors DHE Food Grade Progressive Cavity Pump with Oenological 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

Inlet/Outlet Sizes - 25mm to 300mm

Drive - AC Electric, Bareshaft

Max Suction Lift - 8M

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DESCRIPTION

Nova Rotors DHE Food Grade Progressive Cavity Pump with Oenological 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 DHE series progressive cavity pump is installed on a mobile stainless steel trolley and fitted with a hopper feed system. This particular variation is specifically designed for the wine industry for pumping grapes with or without stems. A protection grate is fitted above the hopper to stop any unwanted solids from entering and damaging the pump. 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. The large handle on the trolley can accommodate control panels and inverters, it can also be supplied with a level probe on the hopper to automatically shut down the pump and avoid dry running.

 

This progressive cavity pump is state of the art and complies with standards EHEDG and 3A  for use in the food, beverage, chemical, cosmetic and pharmaceutical industries. This series is designed for maximum sterilisation when performing clean in place (CIP). The pump geometry allows for maximum drainage and avoids any possible dead zones.


All metal components are in this food grade pump are manufactured from either electropolished stainless steel 304 or 316 and all rubber components comply with food standards. The connection options for this food grade pump include DIN 11851, Clamp ISO 2852, Clamp ASME-3A, Clamp DIN 32676, RJT and SMS 1145.


Sealing options for this positive displacement hygienic pump include gland packing, gland packing with flushing, single mechanical seal, single mechanical seal with quench, double mechanical seal and tandem double mechanical seal.


This food grade progressive cavity pump is Atex certified for handling flammable fluids and installation in non-safe areas.


This hygienic pump is ideal for many applications in the food, beverage and pharmaceutical industries, including fruit juice pulp, fruit paste, grapes, grape paste, milk and dairy, sugar industry, breweries, distilleries, creams, shampoo, wine and edible oils.



Product summary

 

                      Fitted with mobile trolley and hopper feed with protection grate

                      Food grade EHEDG and 3A certified

                      Various connection options, including DIN 11851, Clamp ISO 2852, Clamp ASME-3A, Clamp DIN 32676, RJT and SMS 1145, Macon and Garolla

                      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

                      ATEX

                      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 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.
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.
Our food grade progressive cavity pumps are available with various connections, including; DIN 11851, Clamp ISO 2852, Clamp ASME-3A, Clamp DIN 32676, RJT and SMS 1145.
The DX/JX Hygienic progressive cavity pump complies with standards EHEDG and 3A for use in the food, beverage, chemical, cosmetic and pharmaceutical industries. This series is designed for maximum sterilisation when performing clean in place (CIP).
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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