Coronavirus Update: We Remain Open For All Enquiries At This Time… Contact Us Today
Go BackGo back
Product code: Varisco J4 Series Centrifugal Self Priming Pump

Varisco J4 Series Self Priming Centrifugal Pump

Pump Type - Self Priming Centrifugal

Max Flow Rate - 180M³H

Max Head - 43M

Max Temp - 90°C

Max Viscosity - 200 cst

Max Solid Passage - 50mm

Self Priming - Y

Pump Materials - AISI316, Bronze, Cast Iron, Ductile Iron, NiAl Bronze

Inlet/Outlet Sizes - 100mm

Drive - AC Electric, Engine, Bareshaft

Max Suction Lift - 7.5M



Varisco J4 Series Centrifugal Self Priming Pump


Flow Rate

Up to 180m³/hr

Head (Pressure)

Up to 43m

Inlet/Outlet Sizes


Drive Options

Electric Motor, Engine, Hydraulic Motor




The Varisco J4 series of centrifugal self priming pump is capable of transferring fluids that are clean, dirty or contain solids in suspension up to 50mm. The largest model in the J4 series can produce flow rates up to 180m³/hr and heads up to 43m.


The Varisco J4 series has many benefits, including the following:

Capable of rapidly self priming up to 7.5m without the use of a foot valve.

A semi open impeller is installed that allows the passage of solids in suspension up to 50mm.

An easily replaceable wear plate is fitted that makes the pump highly resistant to abrasive solids.

The pump is installed in a dry area above the fluid, only the suction pipe needs to be immersed in the fluid. This makes maintenance incredibly simple compared to submersible pumps.

Various drive options are available, including; bareshaft, electric motor, diesel engine, petrol engine, engine mounted on mobile trailer, hydraulic motor and others on request.

All the wearing parts are easily replaceable, once replaced the pump is back to its original performance. This vastly increases the life span of the pump.

Externally lubricated mechanical seal. This allows the pump to run dry for long periods, even when pumping abrasive solids.

The bearing housing is installed with heavy duty ball bearings suitable for direct or v-belt drive.

The Varisco J4 series is Atex certified for installation in a non-safe area.

This centrifugal self priming pump is available in various materials including ductile iron, aluminium bronze and stainless steel. This makes it excellent at handling a wide range of fluids including but not limited to; water, sea water, muddy water, low viscosity fuels, solvents (clean or dirty), milk of lime, caustic soda, hot or corrosive waste water, bilge water, acids and alkaline.

Common application for this centrifugal self priming pump include; fire fighting, grey water transfer, black water transfer, marine general service, aquaculture, ballast water transfer, bilge water transfer, marine deck wash, fuel loading and unloading, diesel transfer, stripping, liquid manure transfer and spraying, sea water cooling, water cooling, sump emptying, dewatering and many more.

Product summary


         Self-priming up to 7.5m without the use of a foot valve

         Semi open impeller, allowing solids passage up to 50mm

         Highly resistant to abrasive solids

         Available in ductile iron, aluminium bronze and stainless steel

         Available bareshaft, with electric motor, diesel engine, petrol engine and hydraulic motor.

         Bearing house with heavy duty ball bearings

         Installed outside the fluid

         Easily replaceable wear plate

         Externally lubricated mechanical seal, allowing long periods of dry running. Double and cartridge seals available on request.

         Back pull out design to ensure quick and easy maintenance

         Independent pump and motor shafts

         Available on mobile trailer if required

         Single phase and three phase 50hz / 60hz motors.

         Atex certified

         Marine certification available


Read More about Self Priming Pumps in our Overview


Due to the casing design, a certain amount of fluid always remains in the pump casing when the pump is not operating. This means the pump can run dry without fluid for a small amount of time. It is always recommended to avoid dry running with centrifugal pumps if possible. Centrifugal pumps will incur damage even after short periods of dry running. 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.
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.
Yes, this pump can be installed in a dry area above the sump if the suction lift height does not exceed 8m. A surface mounted pump has many benefits over a submersible pump, one main benefit being that it is easier the access and maintain the pump.
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 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, 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 4 pole motor rather than a 2 pole 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, impeller, 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. For instance; cast iron, bronze and stainless steel are all suitable for fresh water. If it is a simple transfer application, then the most cost-effective material cast iron will be best. However, if it is a sanitary application, then stainless steel or bronze are better choices.
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.
The best efficiency point or BEP is a point along the pump performance curve that indicates where efficiency for the pump peaks. When selecting a pump, you must try and get as close to the BEP as possible to ensure that the pump is at maximum efficiency when operating. The closer to the BEP the pump is when operating, the lower the energy costs will be, thus saving significant amounts of money during the pump’s lifetime. Also, vibrations will be at their lowest meaning maintenance costs are lower and the lifespan of the pump is maximised. It is very important to pay attention to the BEP when your pump is selected, as an oversized or undersized pump could cost you significant amounts of money.


Not the tasty chocolate chip kind, but important for you to know - we use cookies to offer you the best experience possible when shopping with us.
Continue to browse if you're happy with our Privacy & Cookie Policy.