High-efficiency circulators for supply systems
Circulators for heating, ventilation, air-conditioning and cooling systems or for drinking water systems: KSB offers a broad range of products and know-how.
All of these pumps are maintenance-free, screw-ended or flanged high-efficiency glandless pumps with electric motor and integrated, continuously variable differential pressure control. A two-piece thermal insulation shell is included in the scope of supply as standard.
Benefits of circulators from KSB
- Outstanding energy efficiency: A variable speed circulator by KSB offers the highest overall efficiencies with an energy efficiency index (EEI) of ≤ 0.23
- Highly resistant to pressure and wear: The volute casing is made of grey cast iron with cathodic E-coating (also called cataphoretic coating). For drinking water pumps the volute casing is made of stainless steel. The can is also generally made of stainless steel.
- Maintenance-free design for a long service life by using maintenance-free bearings
- Clearly lowered noise emission with adjusted operating mode and low head
- Easy to start up also after prolonged shutdown periods with special deblocking and venting function
Why using a circulator is worthwhile:
- Low water consumption: Warm water is available as soon as the tap is opened, which prevents unused cold water from going down the drain.
- Minimised risk of legionella contamination by water being circulated in the piping rather than being stagnant
Our circulators top seller
High-efficiency circulators for heating, ventilation, air-conditioning and cooling applications
Circulator for drinking water applications
Circulators. Short explained.
This is how circulators work
A circulator is a centrifugal pump designed to generate a forced circulation in a closed system. The best example is a circulator in a heating system: It transports the hot heat transfer fluid to the radiators. The circulator then returns the cooled-down fluid, so it can be heated up again.
The term circulator refers to glandless circulator pumps. They are used in the treatment and transport of drinking water, for example. Such circulators are also called drinking water pumps.
Circulators are relatively easy to commission. The pumps are designed for high fluid temperatures and a low head in relation to the system pressure. Circulators in closed pumping circuits are available in different designs, for example with or without a shaft seal. Circulators with a shaft seal are often horizontal pumps and feasible for system pressures of up to approximately 100 bar. For higher system pressures seal-less (mainly vertical) pumps are used. Circulators can also be specially designed for specific applications:
- With special impellers for liquid/gas mixtures or suspensions
- With sealing systems incorporating gas cushions or meeting other special requirements of nuclear reactor technology
- With heating devices for liquids which solidify rapidly
- With protective lining preventing erosion
- In explosion-proof design
Circulators are fitted with a control system that controls the entire hot water supply system. The control systems often comprise the following components for controlling the circulator:
- A temperature sensor for starting up the pump when the return temperature is too low. This is how the water is recirculated.
- A lift check valve preventing circulation by gravity.
- A timer for making hot water available immediately at certain times only.
- Combining a circulator with a timer makes sense as the circulation should be limited to what is actually needed. Otherwise energy will be wasted during the night or when residents are away. An integrated control system can prevent this from happening.
KSB circulators are versatile in use
KSB offers a broad range of circulators for the most diverse of supply systems. All our pumps contribute towards an environmentally friendly and cost-optimised pump operation in their respective application. They are employed in various fields and projects requiring pumping systems. What circulator is right for you depends primarily on your application.
Applications of KSB circulators:
- Heating, ventilation, air-conditioning and cooling systems
- Drinking water systems
- General circulation systems
- Solar power and geothermal energy systems