Self-Priming Trash Pumps

The Varisco ST-R Series self-priming centrifugal trash pumps are engineered for maximum durability and performance in the most demanding field conditions. Designed specifically for handling solids-laden fluids, these pumps are ideal for municipal, industrial, and wastewater applications where reliability and ease of maintenance are critical.

The front inspection cover can be used to access all internal parts without disconnecting the pipes and without removing the pump from the installation.

Constructed with high-quality materials and built to endure harsh working environments, the Varisco ST-R pumps offer exceptional self-priming capabilities, handling even the most challenging fluids with solids content. Whether you're dealing with wastewater, or abrasive fluids, these pumps provide dependable service with low maintenance requirements.

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Technical data

FLOW

Up to 420 m3/h

Prevalence

Up to 35 m

Solid handlings

Up to 76 mm

Connections

Up to 200 mm

Self-priming capacity without auxiliary systems

Up to 7,5 m

Standard construction materials

Cast iron, hardened cast iron, cast iron with stainless steel interiors

Advantages

  1. Easy maintenance with removable front door without the need to disconnect the pipes and remove the pump from the system.
  2. Large diameter solids passage
  3. Rotating assembly completely removable from the rear, even without removing the motor, pump and pipes.
  4. High abrasion resistance
  5. Simple restoration of original parameters
Brochure Varisco J and ST-R Series EN

Brochure Varisco J and ST-R Series EN

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Filename
Brochure Varisco J e ST-R - Rev.2021- EN.pdf
Size
4 MB
Format
pdf
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Varisco Manual ST-R - 2022 - EN

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Service Video Tutorial - ST-R Series

Varisco ST-R - Dismantling
Varisco ST-R - Assembly

Pump Configurations

Varisco offers the ST-R Series self-priming trash pumps in various sizes and metallurgical configurations. Available as bare shaft pumps or complete units with an electric motor, the ST-R Series is perfect for handling water with suspended solids in wastewater applications and other demanding performance requirements.

ST-RS

Bare shaft pump

This pump type features a compact, bare shaft design, making it adaptable to different motor and drive configurations for various industrial applications.

wastewater pumps

ST-R…BASE

Base and joint pump

A base and joint self-priming centrifugal pump is a robust and efficient pumping solution mounted on a sturdy base frame with flexible coupling to motors

self-priming centrifugal trash pumps

ST-R SERIES

The operating principle of self-priming pump

The operating principle of a self-priming pump relies on its ability to evacuate air from the suction line and create a vacuum, allowing liquid to be drawn into the pump casing without the need for external priming.

The air is drawn into the pump by the vacuum created by the moving open impeller, and it emulsifies with the liquid in the pump casing. The air-liquid emulsion is forced into the priming chamber where the lighter air separates and comes out from the delivery pipe; the heavier liquid falls back and recirculates.

Once all the air is expelled from the suction duct, the pump is activated and runs just like a regular centrifugal pump. The pump can also run with an air- liquid mixture.

The non-return valve has a dual function: it prevents the suction pipe from emptying when the pump is not running; if the suction pipe is accidentally emptied, it keeps sufficient liquid in the pump casing for priming. The delivery pipe must be free to release the air deriving from the suction.

st-r series varisco

ST-R SERIES

Complete access to all internal parts for cleaning operations

One of the standout features of the ST-R pumps is the front inspection cover, which allows for rapid and convenient access to all internal components. This means users can perform unclogging operations and routine maintenance without disconnecting the piping or removing the pump from its fixed installation. This design not only reduces downtime but also minimizes labor costs and enhances overall operational efficiency.

Removing pump inspection cover for cleaning operations - phase no. 1 Removing pump inspection cover for cleaning operations - phase no. 1
Removing pump inspection cover for cleaning operations - phase no. 2 Removing pump inspection cover for cleaning operations - phase no. 2
Removing pump inspection cover for cleaning operations - phase no. 3 Removing pump inspection cover for cleaning operations - phase no. 3
Treatment plant

Applications

To ensure correct pump operation, it is crucial to pick the right product with respect to the application and the chemical-physical characteristics of the fluid being treated.

Sewage pumps
Sewage plants

For water treatment Varisco pumps are the ideal solution thanks to the design of materials resistant to the chemical aggression of substances contained and the option of pumping fluids with suspended solids.

Industrial pumps
General Industries

Industries manufacturing painting machinery, Feed industry, Industries for the processing, Automotive industries, Steel plants, Tanneries, Paper factories, Mechanical processing industries, Protection of sites subject to floods, Oil mills

Pumps for recycling
P. E. T. Washdown and Recycling

Varisco pumps with electric motor can be used within the PET recycling cycle for handling the washing fluids of plastic waste to be recycled

Pump for wine industry
Wine Industry

Washdown, Canning industry

Pumps for marine
Naval and shipboard platforms

Varisco pumps can be used in naval units and in ports for loading/unloading services of different types of fluid, for general services on board the ship and ballasting. 

Pumps for agricolture
Pet Food and Agricolture

Varisco pumps are used in ancillary applications for waters containing agricultural manure for the livestock, farming, dairy and agricultural sectors.

News and Success Stories

Varisco provides news and success stories on pumping systems, enforcements from our customers and tips for the maintenance and use of internal gear pumps, open impeller pumps and more.

2024-08-31

Success story

Varisco pumps for paper industry

Cartiera del Borgo in collaboration with Varisco, has optimized its separation systems by installing self-priming centrifugal Varisco J pumps at the Fabbriche di Vergemoli production paper plant.
read more
paper industry

2024-05-31

Success story

Varisco pumps for powder detergent production

Varisco pumps can be used within the detergent powder production cycle to handle very abrasive slurry with high viscosity and for washing tanks and production lines, respectively.
read more
alternative text for accessiliblty

2023-11-30

Success story

Varisco pumps in PET recycling plants

Varisco pumps can be used within the PET (polyethylene terephthalate) recycling cycle for handling the washing fluids of plastic waste to be recycled and others.
read more
alternative text for accessiliblty