Mechanical Seals

American Seal & Packing

Rotating Face Mechanical Seals:

Mechanical Shaft Seals Are The Best Way To Seal A Pump. Face Seals Prevent Leakage Better Than Packing And If Selected Properly Will Last Longer. Mechanical Seals Used In Clean Well Lubricated Applications Can Last 20 Years. Seals Can Be Constructed In Single (Allowing Only A Vapor To Escape) Or Double Configurations to meet fugitive emission requirements.

Shaft Seals Are Engineered For Shaft-Sealing Applications To Serve Original Equipment Manufacturers Or Field Replacement Requirements, Our Seals Will Hold Up To Difficult Applications. We Can Also Asset In The Conversion From Braided Pump Packing To A Mechanical Seal.

American Seal & Packing Delivers A Full Range Of Rotary Mechanical Seals Configurations And Component Materials – To Handle Pump Service Requirements In A Wide Range Of Industries. . When You Specify AS&P Seals You Have The Advantage Of Proven Reliability. When We Need Engineered Seals For Difficult Applications We Utilize The Engineering Departments Of Some Of The Top Mechanical Seal Manufacturers In The World including ASI, Latty, and Flow Serve.

We Also Supply Replacement Rotating Face Units And Seats For Industry Standard Seals As Well As Doing Complete Repairs.

Mechanical Seals Feature:

• *Invisible leakage
• *Less friction/power loss
• *No to little wear on the shafts or sleeves
• *Flexibility – to accommodate shaft deflections and “End Play”
• *No period maintenance
• *Long Life

As mechanical seals have evolved

They have become more reliable, more capable of handling ever wider application ranges, and more complicated.  Understanding the basics of  “how a mechanical seal functions” will help you understand the value of using the best available technology.

Fundamentally, every seal will have a stationary part and a rotating part.  While companies like John Crane (who we are not affiliated with) and Durametallic (now Flow Serve) have argued which seal face should be harder. Most seal companies will agree it does not matter and the argument was over the marketing of a “better mousetrap”.  The seal faces will run against each other and both are lapped and polished to 2-3 light bands (roughly 6 millionths of an inch). The flatness of the seal faces prevents any leakage other than a vapor. Double seals prevent the vapor from getting out in AQMD/EPA fugitive emission sensitive applications.

3 key areas need to be sealed for a mechanical seal to perform properly. Along the pump shaft, a rubber bellows, o-rings, or PTFE / Flexible Graphite wedges are used to prevent leakage along the shaft. At the entrance to the pump’s stuffing box, an o-ring or gasket is used to prevent leakage from escaping from it. And 3rd the area between the seal faces.

The 1923 first invention of the mechanical seal that would seal a rotating shaft with no visable leakage has come a long way.