Process Controls Home
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Dry-running protection
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25% of all pump failures are caused by dry-running. Grundfos CR offers a way to avoid dry-running altogether!
Grundfos LiqTec - a finger on the switch
The only way to prevent the disastrous consequences of dry-running is to have a finger on the switch at all times. The Grundfos LiqTec acts as such a finger by checking at intervals of a fraction of a second to make sure there is liquid in the pump. And if there isn't any liquid, it stops the pump immediately.
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Liquid in the Pump
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No liquid in the pump
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No liquid in the pump
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Liquid in the pump
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Cartridge Seal
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Superior reliability with the unique cartridge seal
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Hard-wearing seal materials prevent unnecessary and prolonged downtime in your system. Seal reliability is also enhanced by the cartridge design since there is no risk of assembling the components incorrectly, preloading the spring incorrectly or applying greasy fingers and dirt on sensitive surfaces. These would all significantly shorten the life of a seal.
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Within minutes you can remove the old seal, put in the new cartridge and start the pump. All this can be done without special tools. You do not need to dismantle the pump. Moreover, motors over 165 pounds can be left in place during seal replacement.
Cartridge seal available on CRIs/1/3/5/32/45/64/90 only.
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Outstanding Materials
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Titanium - never corrodes
As fast as the ferrous metals in a pump corrode at the hands of saline liquids, so too does pump reliability and efficiency. After dry-running, corrosive liquid is the next most common cause of shortened pump life. High-grade stainless steel goes a long way to making CR corrosion-proof, but extreme conditions require extreme measures.
The CR is the only pump of its kind which comes in a full-titanium variant - CRT. Titanium is totally corrosion-free.
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Not even a decade of full immersion in salt water will leave a blemish on the titanium surface.
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CR Range (
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More than just cold water (
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Choice of materials is crucial
A range of alternative materials is available to adapt the Grundfos CR to handle the wide variety of liquids encountered today - from drinking water to aggressive industrial liquids.
For non-corrosive liquids
The CR is made of stainless steel AISI 304 and top-quality cast iron. The CRI is an all stainless-steel pump. The CR and CRI are primarily intended for pumping water and other non-corrosive liquids.
For aggressive liquids
High-grade AISI 316 stainless steel is used in the CRN to withstand aggressive industrial liquids.
For saline liquids
The CRT is made of titanium and is therefore totally corrosion-free in saline liquids - unlike any other pump of its kind. Only the CRT can offer such high levels of reliability under such uncompromising conditions.
For custom-built CR
The standard CR range is supplemented by a custom-built programme which is anything but standard. An entire development team is dedicated to custom-building CRs to cover applications which are out of the ordinary. Please contact your local Grundfos sales office for more information about custom-built CRs.
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Aggressive or corrosive liquids
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Seawater, hypochlorites, hydrochloric acid, ferric chloride, nitric acid, chromic acid, phosphoric acid
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Abrasive liquids
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Metasilicate-containing cleaning agents, abrasive alkaline cleaners, phosphates
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Toxic or explosive liquids
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Trichlorethylene, toluene, petroleum, ethyl alcohol, methyl alcohol
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High-viscosity liquids
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Glycols, carboxylates (for cooling), lubricating oils, rapeseed oil
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Hardening liquids
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Water-based paint, glue, vegetable oils
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Crystallizing liquids
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Glycol additives, naphthalene, sugar products(e.g.dextran), salts
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High pressures
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Water treatment, cleaning/washing
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Extreme tempera ures
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Petrochemicals, oils, boiler feed, secondary coolants
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By finding the right combination of motor size, shaft seal, pump materials and bearing materials, a CR can be configured to cope with a multitude of difficult media.
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