MULTI-SPRING SEALS

H8B / H9B

  • O-ring, Multi-Spring Pusher
  • To Imperial Dimensions
  • Balanced
  • Bi-directional

H8B is a balanced mechanical seal

based on the industry standard "Type

8B1 & 9B" designs for imperial shafts /

housings. The multi-spring design ensures even face pressure, minimising face wear whilst also compensating for any shaft misalignment.

 

Originally designed to use a PTFE wedge (H9B) as the secondary seal,

improvements in o-ring materials have made the o-ring version (H8B) more common, due to ease of access and replaceability.

 

The multi-spring holes are ported to the rear, reducing the risk of spring clogging from product build-up.

 

An additional rear pin hole allows two

units to be mounted back-to-back,

forming a double seal.

  • Operating conditions¹

PARTS

A

B

C

D

E

F

G

H

I

J

K

L

M

Stationary O-ring

Stationary Face / Ring

Rotary Face / Ring

Rotary Snap Ring

Rotary PTFE Spacer Ring

Rotary O-ring

Rotary Washer

Rotary Multi-Springs

Rotary Housing

Stationary PTFE (optional)

H9B - A Seat (optional)

H9B - PTFE wedge

Rotary Set Screws

SEAT OPTIONS

OG

A

W

standard, slot

PTFE mounted

Euro o-ring

EQUIVALENT

8B1 / 9B

M02SU / M02U

1609BS / 1609B

RB874B / RB875B

Temperature:

Pressure:

Speed:

-40°C to +260°C

< 83 bar, 1200 psi, 8.3 MPa

< 25m/s, 5000 fpm

rpm < 1500000/(79.8 x D1)

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

DATA SHEET

H8B - Data Sheet
  • Material options

Rotary Face:

Stationary Face:

Elastomer:

Metal Parts:

CAB, A1 or SiC

SiC

N, V or EP

304S.S.

TYPE 8B1 / 9B

PRODUCT INFORMATION

DIMENSIONS

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