CR Double Shaft Seal - Back-to-back
For application with toxic, aggressive, or explosive liquids Grundfos can offer a CR pump with a Back-to-back double shaft seal. The back-to-back double seal protects the surrounding environment and the people working in the vicinity of the pump. The back-to-back seal consists of two shaft seals mounted in a back-to-back arrangement in a separate seal chamber. The pressure in the seal chamber must be higher than the pump pressure; therefore the CR pump with back-to-back seal arrangement requires a separate system to maintain the pressure in the seal chamber. The back-to-back double seal arrangement with pressurized seal chamber prevents the pumped liquid from leaking through the shaft seal to the environment.
CR Double Shaft Seal – Tandem
For applications with crystallizing, hardening, or sticky liquids Grundfos can offer a CR pump with a Tandem double shaft seal. This type of double seal consists of two shaft seals mounted in a tandem arrangement in a separate seal chamber. If the primary seal is leaking, the pumped liquid will be flushed away by the flushing liquid. The flushing liquid pressure must always be lower than the pumped liquid, therefore a separate system to maintain flow across the seal face must be present.
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