Mechanical Seals

A mechanical seal is not a complex device. It consists primarily of a rotary seal face with a driving mechanism which rotates at the same speed as the pump shaft, a stationary seal face which mates with the rotary and is retained using a gland or in some pump models an integral stuffing box cover, a tension assembly (utillizing springs or a metal bellows) keeps the rotary face firmly positioned against the stationary face preventing, excluding, and containing contamination and leakage, both when the pump is not in operation and when the pump shaft is rotating. Static sealing gaskets, orings or elastomeric bellows are strategically located to complete the seal assembly.

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How Mechanical Seal Work?

Mechanical seals are engineered for most pumps, mixer and agitator applications in maintenance. In many cases the designs have been proven to be workhorses over years of use. In others seals must be designed for evolving industrial demands.

Rotating face units are the dependable mechanical seals answer for worn equipment when your shaft mechanical seals must be replaced. They are ideal for new equipment designs or to improve the usefulness of existing equipment by converting from pump packing to mechanical seals.

PTFE Seals

PTFE Seals

Split Seals

Split Seals

Mixer Seals

Mixer Seals

Tandem Seals

Tandem Seals

Inboard Seals

Inboard Seals

In-Line Seals

In-Line Seals

In practical use, the basic rotating face mechanical seal principle is adaptable to serve a tremendous number of sealing needs: standard mechanical seals can suit most requirements-including temperatures to 500 degrees F and shaft speeds to 3600 RPM through the choice of secondary seal and the combination of seal and seat face materials which are offered. Seals can be ordered in balanced configurations to seal pressures above 200 psi, or used in a multiple for extremely high pressures or especially severe fluid services....Special mechanical seals can be furnished to meet the most demanding of industrial applications considering pressure, temperature, speed or fluid.

Features of Mechanical Seals:

Advanced and Special Features

  • Invisible leakage
  • Less friction/power loss
  • Seals a pumps shaft while allowing it to rotate
  • No to little wear on the shafts or sleeves
  • Flexibility - to accommodate shaft deflections and "End Play"
  • No periodic maintenance
  • Long Life
Cartridge Seals

Cartridge Seals

Cartridge Seals

Cartridge Seals are pre-assembled package of mechanical seal components making installation much easier with fewer points for potential mechanical pump seal installation errors to occur.

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Seal Pots

Seal Pots

Seal Pots

Mechanical seals occasionally require a seal pot to provide a buffer fluid for your double cartridge seals. Seal pots can not only provide a lubricating buffer, but they can also heat or cool the barrier fluid they contain.

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Why We Choose Us

Single Spring Mechanical Seals

Utilize a single spring coiled in a right of left hand design to accommodate left and right hand turning pumps. They have the flexibility to accommodate misalignment, shaft deflection, and break away shock loading. It resists clogging in extremely viscous fluids.

All mechanical seals are constructed of three basic sets of parts:

  • 1) A set of primary seal faces: one that rotates and one that remains stationary.
  • 2) A set of secondary seals known as shaft packings and insert mountings, such as o-rings, rubber boots, PTFE or Grafoil wedges, or V-Rings.
  • 3) Mechanical Seals have hardware including gland rings, collars, compression rings, pins, springs, retaining rings and bellows.
  • Cartridge Mechanical Seals

    Are the easiest seal for a mechanic to install. Only being required to slide onto the pump shaft and bolt to the pump gland, the cartridge seal cannot be miss installed.
    Cartridge seals must fit the stuffing box there is a form on www.americansealandpacking.com under mechanical seals with this and other information on it to help the customer make sure the seal fits there pump.
    Installation of single spring, metal bellows or multiple spring seals require much more effort to be sure of an effective long lasting seal. Ask your American Seal & Packing sales representative for installation directions.
    Inflatable seal Seals that inflate and deflate in three basic directions of operation: the axial direction, the radial-in direction, and the radial-out direction. Each of these inflation directions has their own set of performance parameters for measurements such as the height of inflation and the center-line bend radius that the seal can negotiate.

    Mechanical Seals can be classified by Arrangement
    Mechanical Seals can be classified by Arrangement

    A mechanical seal works though the use of two very flat (generally within 3 light bands flat) lapped faces which make it difficult for leakage to occur (beyond a vapor). As mentioned above one face is stationary and one rotates with the shaft. One of the two faces is usually a non-galling material such as carbon-graphite. The other will be a harder material providing dissimilar materials making contact and allowing one to be a sacrificial. The softer mechanical seal face usually has the smaller mating surface and is commonly called the "wear nose" of the mechanical Seal.

    Mechanical Seals can be classified by Design
    Mechanical Seals can be classified by Design

    The Easiest seal to install as a replacement for pump packing is a cartridge type mechanical seal:
    The Beauty of cartridge seals are they are self-contained. Holding all the elements of a mechanical seal set:
    *Rotating Face Seal
    *Stationary Seal face or faces
    *Shaft sleeve
    *Gland

    What is Mechanical Seal

    Recent Seal News

    25

    August
    Cartridge Seals - in stock

    We have placed into inventory ANSI standard cartridge seals which we offer at exceptional prices.

    30

    August
    Metal Bellows Seals

    We have both General Service Metal Bellows seals with AM350 bellows and Stainless End Fittings.

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    • Santa Ana, California, USA 92705
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