CinchSeal 7500 Series CEMA Rotary Shaft Seals 

CinchSeal 7500 Series CEMA rotary shaft seals are designed for zero maintenance due to their unique self-adjusting design. These seals are ideal for industrial screw conveyors, bucket elevators, and bulk solid applications.

The 7500 Series consumes 30% less power than packing seals and will not undercut shafts. Fully assembled and possessing a rugged modular design, our 7500 Series industrial seals will not leak due to foul bearings or contaminating processing areas.

The 7500 Series Shaft Seals are offered in two different versions: the 7550 for use in most powder applications, and the 7520 for slurries or very abrasive applications. The key component of the 7500 rotary shaft seal design is the solid elastomer, which is made from FDA-approved silicone and can handle temperatures up to 400F degrees. The elastomer is molded slightly smaller than the shaft size so that an interference fit is achieved. It is this tight fit that seals the shaft, which stops material from migrating past, and drives the two rotating faces called “rotor cups”. The rotating rotor cups compressed against the two stationary stator plates create the primary seal that stops product leakage. These dynamic seals are also air purged at 5 to 7 PSI above any pressure in the vessel to assist in maintaining a positive seal.

The air-purged 7500 series seal turns with the shaft, providing a major benefit to customers. Alternative sealing options like rope packing remain stationary while the shaft is turning, which can score and damages the shaft. This can lead to expensive maintenance when you have to replace the shaft. With CinchSeal, the internal seal elements turn with the shaft, thereby eliminating the risk of shaft damage.

The 7550 shaft seal series features rotor cups made from a special mineral-filled PTFE blend, which is the seal's wearable part. On the 7520 model, the rotor cups are made of aluminum that we hard coat with a unique process that gives them 62 on the Rockwell scale (the same hardness as Tungsten Carbide). The hard-coated aluminum rotor cups run against inner and outer PTFE stators, now the wearable part of the seal, and will be replaced when worn.

When buying a repair kit for the 7550 model, it would consist of a new solid elastomer and new PTFE rotor cups. If you have a 7520 model, a repair kit consists of a new elastomer and two new PTFE stator plates (see exploded views below). All these pieces compress into the mechanical seal as you tighten down the cover plate with the four screws, and the optimum seal face load is established.

Check the 7520 Series Shaft Seals Guide and the 7550 Series Shaft Seals Guide to select the rotary shaft seal that best suits you.

HVH Industrial works with the specialized engineering teams of manufacturers to meet our customer's requirements and the highest quality standards. 

If you have any questions, write us via live chat (one of our team members will answer your questions), call, or send us a quote request. The HVH team is always ready to help you.

1(866)577-4040

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