Close-coupled centrifugal pumps with closed impeller – HD series
Salvatore Robuschi HD 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. They are suitable for pumping clean liquids or liquids containing a small percentage of suspended solids. They can be equipped with 4 types of seals to choose from: single, double tandem, double “back to back” and gland packing packing. A version with food connections is also available in a version with a shrouded motor. All pump sizes are equipped with standard IEC electric motors.
HD series pumps are suitable for pumping aggressive organic and inorganic liquids in the chemical industry, general industry, food industry, solvent recovery plants, power generation plants, metallurgical industry and evaporation plants.
FAST FACTS
FEATURES AND BENEFITS
Salvatore Robuschi HD 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. They are suitable for pumping clean liquids or liquids containing a small percentage of suspended solids. They can be equipped with 4 types of seals to choose from: single, double tandem, double “back to back” and gland packing packing. A version with food connections is also available in a version with a shrouded motor. All pump sizes are equipped with standard IEC electric motors.
HD series pumps are suitable for pumping aggressive organic and inorganic liquids in the chemical industry, general industry, food industry, solvent recovery plants, power generation plants, metallurgical industry and evaporation plants.
| Pump capacity: | up to 200 m3/h |
| Lifting height: | up to 60 m |
| Maximum working pressure: | 8 bar |
| Temperature: | up to 120°C |
| Delivery nozzle: | from DN 25 to DN 80 |
| Impeller type: | closed |
| Pump materialss: | AISI 316 stainless steel |
| Mounting flanges: | PN16 or DIN11851 |
| Industry | Application example |
| Food industry | Pumping unfiltered wine, transfer of brines, sauces, syrups, vinegar. |
| Textile industry | Dosing of liquids with dissolved dye or chemicals in an automatic dissolving system. |
| General industry | Transfer of hot water, water and glycol solutions, pumping dirty water from scrubbers. |
The HD series pumps are monoblock centrifugal pumps for difficult applications. Thanks to their simple design and high modularity of components, they are characterized by a small number of spare parts and low operating costs. Design with a closed impeller (HD) is suitable for pressing clean liquids lub cieczy zawierających a small percentage of solids in suspension.
Pumps with flanged connections comply with EN 22858 (ISO 2858), so they are interchangeable with other pumps that comply with this standard. The HD series pump has four types of seals to choose from: single, double tandem, double back-to-back and gland packing. This means that 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 size of the pump. In addition, all pump sizes are equipped with standard IEC electric motors.
HD series pumps are suitable for pumping aggressive organic and inorganic liquids in the chemical industry, general industry, food industry, solvent recovery plants, power generation plants, the metallurgical 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.
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1. Standard IEC motors The motors mounted 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. Optimized impeller geometry |
| HDM | Monoblock version with standard B35 electric motor and UNI PN 16 flanged connections. |
| HDA | Monoblock version with standard B35 electric motor and DIN 11851 food connections. |
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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. |
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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. |
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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. |
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packing seal
Packing seal is a special cord wound around the shaft separating the space between the body and the pump drive. Packings are still used in many applications. |
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Flange connection interchangeable with chemical pumps according to ISO 2858. |
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DIN 11851 food connections or others on request. |