7650 Model
In the 7650 model, the aluminum housing and endplate are solid but the internal sealing parts are split so that the seal can be repaired without having to unbolt the seal housing. This is the perfect scenario if you have a pillow block bearing arrangement and don’t want to remove the bearing, gear box, or drive motor to rebuild the seal. The split “rotor cups” are made out of a mineral filled PTFE, and they are now the sacrificial part of the seal. The 7650 repair kit consists of a new split elastomer and two split PTFE rotor cups.
The 7620 and 7650 are considered air purged shaft seals that perform best when purged with continuous air pressure set at 5 to 8 PSI over internal vessel pressure. The air purge improves the seal life of the internal parts by creating a higher pressure inside the seal which creates a natural air barrier that keeps product out of the seal and inside the equipment. Air also keeps the rotating seal faces cooler, and it adds closing force to the seal faces as they wear from use so product can’t leak by.
The 7620 and 7650 are available in shafts sizes ranging from 3.937” up to 6.00” and are both repairable.