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Cartridge Seals for vertical multistage pumps

Cartridge type seals (also known as Grundfos seals or VM seals) are a particular type of integrated design widely used in vertical multistage industrial pumps, particularly the Grundfos CR/ CRE and similar like the Davey VM. They are designed as a one piece mechanism that can be removed and reinstalled from the outside of the pump housing without having to disassemble the pump. This is very important with vertical multistage pumps as they can have 10 or more impellors and a lot of associated parts and can be time consuming to correctly rebuild. The rotary and stationary are pressed together but still are able to rotate against each other. This cartridge has a thread or similar locking mechanism on its outside and this is used to lock it in place just inside the top of the pump housing, this has the stationary face built into it. The rotary mechanism has a long bellows with an O-Ring shaft seal that runs up its inside and also the inside of the stationary. This comes out the top of the stationary section and has a locking collar attached to it which is generally grub screwed onto the pump shaft to both tension it and set the pump height in the housing. The rotary face is commonly silicone carbide or  tungsten carbide. The stationary face is normally silicone or tungsten carbide too. They are can be used for dirty water but solids generally block up a vertical multistage pump. They are rated to handle high operating pressures up to 1000kpa (10 Bar) but can generally run much higher. Cartridge seals are available from Rural Pumps in only a 12mm, 16mm and 22mm sizes in both bolt in and thread in types, we have a range of Cartridge type seals IN STOCK HERE in our webshop.

Operating Limits: Temperature: -30°~180°C  |  Pressure: ≤2.0 MPa  |  Speed: ≤15 m/s

Please contact us if you are looking for something unusual or use our pump selector in our webshop to get a replacement seal for your pump.