MULTI-SPRING SEALS

H74UD

  • O-ring, Multi-Spring Pusher
  • To DIN EN 12756 Standards
  • Double Seal (Back-To-Back)
  • Unbalanced
  • Bi-directional

H74UD is a DIN EN 12756 compliant

mechanical seal for metric shafts

(apart from fitting length). It is based on the industry standard "M74-D" design.

 

The multi-springs ensure even  face pressure, minimising face wear whilst also compensating for any shaft misalignment. The design incorporates the same easily interchangeable seal face features as the H7U and H7B.

PARTS

A

B

C

D

E

F

G

H

I

J

K

L

M

Inb. Stationary O-ring

Inb. Stationary Face

Inb. Rotary Face / Ring

Inb. Rotary O-ring

Inb. Rotary Thrust Ring

Rotary Multi-Springs

Rotary Holder

Outb. Rotary Thrust Ring

Outb. Rotary O-ring

Outb. Rotary Face / Ring

Outb. Stationary Face

Outb. Stationary O-ring

Rotary Set Screws

optional:

"D22" spring-loaded pin

SEAT OPTIONS

  • Operating conditions¹

Temperature:

Pressure:

Speed:

-50°C to +220°C

< 16 bar, 230 psi, 1.6 MPa

< 20m/s, 4000 fpm

rpm < 1200000/(3.14 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.

G9

G14

G4

G13

G6

G49

standard - SiC

outboard - CAB

Euro - SiC

Euro - CAB

DIN EN Short

special - SiC

EQUIVALENT

  • Material options

Inboard:

Outboard:

Elastomer:

Metal Parts:

SiC/SiC

SiC/CAB or SiC/SiC

N, V or EP

304S.S.

M74-D

M010D

RB678

DATA SHEET

H74UD - Data Sheet

M74-D

PRODUCT INFORMATION

DIMENSIONS

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