Monoblock centrifugal pumps with open impeller – HG series
Salvatore Robuschi HG pumps are monoblock centrifugal pumps for demanding applications. Thanks to their simple design and high modularity of components, they are characterized by low operating costs. Designed for pumping liquids with suspended solids, also viscous, with gas or air (up to 10% content). They have 4 types of seals to choose from: single, double tandem, double “back to back” and gland packing. A version with food connections is also available in a version with a shielded motor. All pump sizes are equipped with standard IEC electric motors.
HG series pumps can handle slightly contaminated liquids or non-abrasive slurries in the chemical and petrochemical, general, food, sugar, water/solvent recovery process, power plants, steel, textile and other industries.
FAST FACTS
FEATURES AND BENEFITS
Salvatore Robuschi HG pumps are monoblock centrifugal pumps for demanding applications. Thanks to their simple design and high modularity of components, they are characterized by low operating costs. Designed for pumping liquids with suspended solids, also viscous, with gas or air (up to 10% content). They have 4 types of seals to choose from: single, double tandem, double “back to back” and gland packing. A version with food connections is also available in a version with a shielded motor. All pump sizes are equipped with standard IEC electric motors.
HG series pumps can handle slightly contaminated liquids or non-abrasive slurries in the chemical and petrochemical, general, food, sugar, water/solvent recovery process, power plants, steel, textile and other industries.
| Pump capacity: | up to 200 m3/h |
| Lifting height: | up to 60 m |
| Maximum working pressure: | 8 bar |
| Temperature: | up to 120°C |
| Discharge nozzle: | from DN 25 to DN 80 |
| Impeller type: | semi-open |
| Materials: | AISI 316 stainless steel |
| Mounting flanges: | PN16 or DIN11851 |
| Industry | Application example |
| Food industry | Pumping hot alcohol (110°C) with fine particles in vacuum distillation plants, pumping acidic wastewater, recovering demineralized water, pumping grape juice in the wine industry, yeast waste, sugar solutions. |
| Wastewater treatment | Transfer of acidic wastewater in vacuum evaporation plants, brines, pumping liquids in flotation recirculation processes. |
| Chemical industry | Transfer of water and glycol solution. |
| Chemical industry | Pumping caustic soda in the soap and glycerine production industry. |
HG series pumps are monoblock centrifugal pumps for demanding applications. Thanks to their simple design and high modularity of components, they are characterized by unlimited spare parts and low operating costs. The open impeller design (HG) is suitable for pumping liquids with a suspension of solids (non-fibrous), also viscous, with gas or air.
Flanged pumps have the same center-to-center dimensions according to EN 22858 (ISO2858), so they are interchangeable with pumps from other manufacturers that meet this standard. The HG series pump has four types of seals to choose from: single, double tandem, double back-to-back and gland packing packing. As a result, these pumps can be used for difficult applications. A version with food connections is also available in a version with a shielded motor. The maximum working pressure is 8 bar depending on the pump size. In addition, all pump sizes are equipped with standard IEC electric motors.
HG series pumps can handle slightly contaminated liquids or non-abrasive slurries in the chemical and petrochemical industries; they are well-suited for handling liquids with a gas content of up to 10%. They are also used in general industrial services, the food industry, dissolved air flotation systems, the sugar industry, water/solvent recovery processes, power plants, the steel industry, the textile industry, and small evaporation plants.

The impeller of a centrifugal pump is driven by a motor (most often electric) via a shaft. The pump head, along with the coupling and motor, constitutes the pump unit. In centrifugal pumps, gears are not used, and the rotational speed of the motor is transmitted directly. Most commonly, two- and four-pole motors are used (rotational speeds of approximately 2900 and 1450 rpm, respectively), and less frequently, six- and eight-pole motors are used (approximately 900 and 700 rpm).
A very important element of the pump is the seal at the point where the drive shaft enters the body. This seal is designed to prevent the pumped liquid from leaking out of the pump, maintain pressure inside the pump, and prevent air from entering the pump. Among the seals for centrifugal pumps, we can distinguish gland packing packings, single mechanical seals, and double mechanical seals. We also distinguish a special type of pump – sealless (hermetic) pumps.
![]() |
1. Standard IEC motors The motors fitted on Salvatore Robuschi HD pumps are of the B35 type (with flange and feet), which are readily available on the market. The pump shaft is fixed to the motor shaft and is replaceable in case of wear.2. Different Sealing Systems 4 types of sealing arrangement to choose from: single, double tandem, double back-to-back and gland packing packing.3. One casing, two impellers Each pump size can utilize a unique casing that applies to both closed and open impellers (with a replaceable wear plate). This versatility allows for easy pump application in new installations and processes.4. Replaceable Wear Plate Considering that the pump body is the most expensive part in a monoblock centrifugal pump, the ability to replace the wear plate significantly reduces maintenance and repair costs. |
| HGM | Monoblock version with standard B35 electric motor and UNI PN 16 flanged connections. |
| HGA | Monoblock version with standard B35 electric motor and DIN 11851 food connections. |
![]() |
Single mechanical seal
The most popular mechanical seals for use with non-contaminated liquids (no solids). The pumped liquid lubricates the sealing surface and dissipates heat. |
![]() |
Double back-to-back seal
A back-to-back double seal is a solution with a pressurized chamber. The external barrier fluid, supplied at a pressure approximately 0.5 – 1 bar higher than the pressure of the pumped medium, separates the product from the atmosphere. |
![]() |
Double tandem mechanical seal
This type of seal has two pairs of face seals facing in the same direction. The use of this seal allows for a gradual reduction of pressure from the pump chamber or the use of a flushing medium and monitoring of the main mechanical seal of the product. The external service liquid reservoir serves to separate the pumped product from the atmosphere. |
![]() |
packing seal
Packing seal is a special cord wound around the shaft separating the space between the pump body and the drive. It does not provide 100% tightness due to the need for continuous lubrication and cooling of the cords. |
![]() |
Flange connection interchangeable with chemical pumps. |
![]() |
DIN 11851 food connections or others on request. |