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Dynamic Seals
An equilibrium in the back of the pump is achieved between the pressure of the liquid in the pump and the atmosphere, creating an air void at the shaft penetration of the case while the pump is running. The dynamic seal provides for zero leakage of the pumped product without the need for costly mechanical seals, packing, and lip seals or in most cases seal water and the associated supporting seal water systems. Product dilution due to seal water is further eliminated. With no rubbing seal components to fail over time, the dynamic seal can operate reliably over the life of the hydraulic wet end of the pump. Dynamic seals can offer reliable service in difficult applications that may include; varying amounts of solids, liquids that are close to saturation prone to crystallizing, scaling liquids and where operational upsets such as cavitation, dead heading of the pump and even dry running can occur. Wilfley pioneered dynamic seals obtaining a US patent in 1920. All Wilfley pumps can be offered with Wilfley dynamic seals for difficult applications handling clear liquids and slurries with corrosive and erosive properties. Dynamic Seal vs. Mechanical Seal
For More Information Wilfley solves the most difficult centrifugal pump and pump system problems. How can we be of service to you?
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Dynamic sealing -- or hydrodynamic sealing -- is accomplished by a combination of pumping vanes on the rear shroud of the impeller and a secondary expeller located behind the impeller, which rotating with the shaft, impart a rotary movement on the liquid in the pump resulting in the liquid centrifugally moving away from the center shaft penetration in the case.