Seal Refurbishment Services

Elastomer Chemical Compatibility

Seal Face Chemical Compatibility

DIAPHRAGM SEALS

H21DIN

  • Diaphragm / band drive
  • General purpose
  • Industry standard

H21 is the most widely used mechanical seal due to its low cost / high efficiency ratio. It is a diaphragm, parallel spring mechanical seal which is self-aligning and positively driven via a drive band.

 

It is designed to suit metric DIN shaft sizes and cavities. For straight shafts, a setting collar can be supplied.

PARTS

A

B

C

D

E

F

G

H

Seat Cup

Seat (CM Standard)

Rotary Face

Retainer

Rubber Diaphragm

Drive Band

Spring

Spring Cap

EQUIVALENT

  • Operating conditions

Temperature:

Pressure:

Speed:

-30°C to 200°C

up to 10 bar, 145 psi

up to 13m/s, 2500 fpm

Type 521

P03

Type 24

MG912

STANDARD SEAT

  • Material options

Rotary Face:

Stationary Face:

Elastomer:

Metal Parts

CAB, SiC, TC

CER, SiC, TC

N, V or EP

Stainless Steel

DCM

BO

BP

metric DIN cup seat

metric DIN o-ring seat

DIN anti-rotation slot

DATA SHEET

H21DIN - Data Sheet

TYPE 21 DIN

PRODUCT INFORMATION

DIMENSIONS

note: dimensions refer to installed length, not 'free' length