MULTI-SPRING SEALS

H891

  • O-ring, Multi-Spring Pusher
  • Rotary Only
  • Metric & Imperial Sizes
  • Balanced
  • Bi-directional

H891 is an internally balanced, o-ring

mounted, multi-spring mechanical seal based on the industry standard "891" design. It is available in metric & imperial sizes and can run against many conventional stationaries.

 

It is designed to replace common unbalanced component seals fitted over straight shafts. The balanced design increases pressure capabilities.

The springs are located internally which prevents clogging.

 

All H891 seals utilise highly accurate

computer-aided manufacturing (CAM), ensuring precision and reliability.

PARTS

A

B

C

D

E

F

Rotary Face

Rotary O-ring

Rotary Holder

Rotary Multi-Springs

Rotary Shaft O-ring

Rotary Set Screws

EQUIVALENT

891

RB690 / RB691

DATA SHEET

H891 - Data Sheet
  • Operating conditions¹

Temperature:

Pressure:

Speed:

-30°C to +260°C

< 42 bar, 600 psi, 4.2 MPa

< 20m/s, 4000 fpm

rpm < 12000000/(3.14 x D1 mm)

rpm < 12000000/(79.8 x D1 inch)

¹Guide-values only (due to diversity of possible applications). Enquire for specific-use cases. Maximum values of each parameter cannot be applied together.

  • Material options

Rotary Face:

Elastomer:

Metal Parts:

CAB, SiC or TC

N, V or EP

316S.S.

891

PRODUCT INFORMATION

DIMENSIONS

Dimensions refer to installed length, not 'free' length: