ACST-4 Glandless Shaft Seal versus Packing Gland Seals
The ACS Valves ACST-4 Glandless Shaft Seal design eliminates the need for conventional packing gland-style shaft seals. The ACST-4 sleeve-style design provides a micro-tolerance, self-lubricating seal to the rotor shaft and uses three, four-lobed ring seals to provide superior sealing, extended duty cycles, and elimination of seal adjustments.
With the packing gland you have roughly 3 rows of packing, and you have your pusher. As the packing will wear, you have to keep adjusting the shaft seal assembly. You have to keep adding more packing and then adjusting the pusher.
After it wears, this is what it looks like. It's packed down. The material is going to creep through there. It's going to wear the shaft, your shaft seal assembly, and your bearing.
The reason this is a superior shaft seal assembly is because it is precision machined on our CNC machines. It is press fit onto the shaft. Material cannot leak out.
With these three quad rings, we groove 3 grooves into the endplate. The quad rings sit perfectly into those grooves, therefore the material has to get through each of those quad rings, each of those grooves, each of the grooves in the cast iron endplate.
As you can see here, this is an old ACST-4 shaft seal assembly Teflon sleeve. The wear is minimal as compared to the packing gland packing shaft seal assembly.
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More Videos
Go ahead, make your valve
Put your own spin on our customizable valves to get the best valve for your application, material and industry.
We have a series of items available for quick shipment
Items include: Pressure blower packages, MD Series, S-Pellet Series, Diverter Valves, Flex Tip Series, Screw Conveyors
How to: Check rotor-to-housing tolerances
Keep your rotary airlock valve compliant with NFPA guidelines and maintain strong performance by checking your rotor-to-housing clearances regularly.
