Question 1

Can the 7500 Series replace rope packing without reworking the equipment?

Accepted Answer

Yes. The 7500 bolts to the same housing pattern as standard CEMA stuffing boxes on screw conveyors, drag conveyors, and most ribbon blenders. Field retrofits typically take a maintenance technician under one hour with the shaft in place — no welding, no machining.

Question 2

How much air does the seal actually use?

Accepted Answer

1 to 3 standard cubic feet per hour at 5 to 15 psig. That's roughly the consumption of a single pneumatic cylinder cycling once per minute. We supply a flow-set regulator with each seal so plant engineering doesn't have to guess.

Question 3

What happens if the air supply fails?

Accepted Answer

The seal continues to function as a contact seal — there is no immediate leakage. Most plants run for hours or days on a failed air supply with no product loss; the air purge is a wear-extender, not a sealing requirement.

Question 4

Does it handle reversing rotation?

Accepted Answer

Yes. Unlike lip seals, the 7500 has no rotational preference. It runs the same in either direction, which matters on ribbon blenders, batch mixers, and reversing screw conveyors.

Question 5

What's the typical return on investment?

Accepted Answer

Most customers recoup the seal cost in under six months on a single bearing-replacement avoided. Heavy-abrasion plants (fly ash, frac sand, alumina) report payback in weeks.

Spec	Value
Temperature range	−40 °F to 400 °F (−40 °C to 204 °C)
Pressure range	−5 to 25 psig (−0.34 to 1.72 bar)
Shaft sizes	1.000" – 6.000" (25 – 150 mm) — non-standard sizes on request
Materials	Carbon steel housing, hardened 17-4 PH stainless faces, FKM secondary
Mounting	Bolt-on flange, 4-bolt or 6-bolt pattern; field-retrofittable
Certifications	FDA elastomers available · ISO 9001 quality system
Air purge	1 – 3 SCFH instrument-quality air at 5 – 15 psig
Design life	5+ years typical service in dry bulk; >10 years documented on screw conveyors

7500 Series

The numbers behind the build.

Where the 7500 earns its keep.

Drop-in compatible with these.

Questions our application engineers actually get.

Often considered alongside the 7500.

7800 Series CEMA

9700 Series

Split Seal

Get the 7500 sized for your equipment.