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Determine Replacement Seal

Guide to Mechanical Seal Types and Component Properties - Page 3

The illustrations below demonstrate the correct procedure of measuring and properly identifying a mechanical seal that is best suited to the application of your needs.

Remove seal to be replaced from the motor shaft and/or sleeve. Make note of materials used for the old seal parts. Identify Head Type [ ] and use caliper to measure inside diameter (I.D.) and outside diameter (O.D.)

Type A and B  /  Type C, D and E  /  Type K, R and T  /  Seal Seat

SEAL HEADS - Type A and B

Seal Head Type A B
Identify Head Type - Determine shaft size:
  • Measure inside diameter (I.D.) (A)
  • Measure outside diameter (O.D.) (B)

The operating height is generally the same for all A and B seals of the same shaft size. More positive identification will result from calculating the seat dimensions following.

SEAL HEADS - Type C, D and E

Seal Head Type C D E
Identify Head Type - Determine Shaft Size:
  • Measure inside diameter (I.D.) of the rubber bellows (A)
    (Add approximately .016" to compensate for rubber compression.)
  • Measure the head O.D. (B)
Determine Approximate Operating Height of Seal:
  • Measure the total length (C) of the rotating portion of the assembled seal (DO NOT include the seat)
  • Disassemble seal and measure the free length of the spring (D)
  • Take half of the measurement in STEP 2
  • Subtract the figure obtained in STEP 3 from the measurement (C) in STEP 1

SEAL HEADS - Type K, R and T

Seal Head Type K R T
Identify Head Type - Determine Shaft Size:
  • Measure inside diameter (I.D.) of the rubber bellows (A)
    (Add approximately .016" to compensate for rubber compression.)
  • Measure the head O.D. (B)
Determine Approximate Operating Height of Seal:
  • Measure the total length (C) of the rotating portion of the assembled seal (DO NOT include the seat)
  • Multiply the total length (C) by .730

SEAL and GASKET

Gasket Seal Seat
Identify Seat Type:
  • Measure the O.D of the gasket while assembled on seat ring (D)
    (Substract approximately .016" to compensate for rubber compression.)
  • Measure the combined seat and gasket thickness (E)

NOTE: It is very important to note the operating temperatures and environment details. This will determine the proper gasket material.

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