METAL BELLOW SEALS

H680

  • Metal Bellows - Rotary Only
  • Metric & Imperial Sizes
  • General Purpose
  • For Corrosive Media

H680 is an edge-welded metal bellows mechanical seal designed to

provide corrosion resistance in a broad range of corrosive media. It is pressure-balanced by design and since the secondary seal (o-ring) is located separately from the bellows in

the shell, it eliminates the possibility

of shaft-fretting or hang-up.

 

It is available in metric & imperial sizes

and able to run against a variety

of stationaries.

PARTS

A

B

C

D

E

F

Rotary Face / Ring

Rotary Face Holder

Rotary Metal Bellows

Rotary Shell

Rotary O-ring

Rotary Set Screws

EQUIVALENT

T680

886

MFL85N

BSAI

DATA SHEET

  • Operating conditions¹

Temperature:

Pressure:

Speed:

-30°C to +260°C

< 25 bar, 360 psi, 2.5 MPa

< 25m/s, 5000 fpm

rpm < 1500000/(3.14 x D1 mm)

rpm < 1500000/(79.8 x D1 inch)

H680 - Data Sheet

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:

Rotary Face Holder:

Metal Bellows:

Elastomer:

Shell:

CAB, A1, SiC or TC

Alloy 20*

AM350^

N, V, EP or ~

316S.S.

*is an austenitic stainless steel containing less than 50%

iron developed for corrosion resistance. Also referred to

trade names: Carpenter® 20 & Incoloy® 20.

^is precipitation hardenable stainless steel developed for high strength, excellent weldability along with corrosion

resistance.

~special compounds available on request e.g. FFKM,

PTFE Encap. & TFE. trade names: Kalrez®, Teflex®, Aflas®

& others.

TYPE 680

PRODUCT INFORMATION

DIMENSIONS

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