Type 21 mechanical seal

Mechanical Seal Type 21The mechanical seal type 21, a hallmark of general use, it has become the industry standard for designers of original equipment (OEM). For centrifugal pumps, compressors and equipment for any rotating shaft. For use in industrial wastewater systems, including treatment for drinking water and the like. This stamp is automatically and compensates for abnormal play of the shaft and wear ring contact face primary or rotating.

Available in the following sets of materials:

 

  •     Coal - Ceramics - Buna (Nitrile) - Stainless Steel.
  •     Coal - Ceramics - Viton (Fluoroelastomer) - Stainless Steel.


Operating limits:

Temperature: ≤ -40º C / 205º C
Pressure: ≤ 11 bar g / 150 psig Speed: ≤ 13 m/Seg.

 

Availability of sizes

 

JOHN CRANE

AVAILABILITY

SIZE

BUNA

VITÓN

1/2"

X

 

5/8"

X

X

3/4"

X

X

7/8"

X

 

1"

X

X

1.1/8"

X

X

1 3/16"

X

 

1.1/4"

X

X

1.3/8"

X

X

1 1/2"

X

X

1 5/8"

X

 

1 3/4"

X

X

1 7/8"

X

 

2 "

X

 

2-1/4"

X

 

2-1/2"

X

 

3 "

X

 

 

SION

TAMAÑO

BUNA

1/2"

X

5/8"

X

3/4"

X

7/8"

X

1"

X

1 1/8"

X

1 3/16"

X

1 1/4"

X

1 3/8"

X

1 1/2"

X

1 5/8"

X

1 3/4"

X

1 7/8"

X

2"

X

2 1/8"

X

2 1/4"

X

2 3/8"

X

2 1/2"

X

2 3/4"

X

3"

X