MULTI-SPRING SEALS

H8U / H9U

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

H8U is mechanical seal based on the

industry standard "Type 8-1 & 9" 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 (H9U) as the secondary seal,

improvements in o-ring materials have made the o-ring version (H8U) 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

Stationary O-ring

Stationary Face / Ring

Rotary Face / Ring

Rotary Snap Ring

Rotary O-ring

Rotary Washer

Rotary Multi-Springs

Rotary Housing

Stationary PTFE (optional)

H9U - A Seat (optional)

H9U - PTFE Wedge

Rotary Set Screws

SEAT OPTIONS

OG

A

W

standard, slot

PTFE mounted

Euro o-ring

EQUIVALENT

8-1 / 9

M01SU / M01U

1609S / 1609

RB874 / RB875

Temperature:

Pressure:

Speed:

-40°C to +260°C

< 24 bar, 350 psi, 2.4 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

H8U - Data Sheet
  • Material options

Rotary Face:

Stationary Face:

Elastomer:

Metal Parts:

CAB, A1 or SiC

SiC

N, V or EP

304S.S.

TYPE 8-1 / 9

PRODUCT INFORMATION

DIMENSIONS

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