ROTARY SHAFT SEALS For Process Engineering Applications

ROTARY SHAFT SEALSFor Process Engineering Applications

The Radiamatic® HTS II, is a special PTFE version of the Simmerring® product group. This high-performance rotary shaft seal sets standards for sealing rotating shafts and spindles.

Function Reliably sealing rotating shafts and

spindles Sealing function by lip tension and

PTFE s memory effect

Fields of application Food and beverage filling equipment

Aggregates in pharmaceutical and cosmetics industry

Gears, compressors and pumps

Electric drive systems

Mixers, kneaders and separators

Benefits at a glance Can be easily adapted to tight

installation spaces Low-friction and anti-adhesive High media and temperature resistance

Free of dead spaces (Hygienic Design) Secures tight fit Only PTFE towards the media

MaterialsPTFE K212: PTFE-carbon compound Approved standard material Good wear resistance & heat transfer For hard sliding surfaces Electrically conductive/antistatic

PTFE C104: Special compound Designed for use in highly dynamic

sealing applications Excellent wear and pressure resistance Good thermal conductivity Suitable to seal against water Electrically conductive/antistatic

PTFE Y002: Special compound FDA and 3-A® compliant Satisfies USP Class VI (121 °C)

requirements Good wear resistance Preserves soft sliding surfaces Good dry running performance

Operational limits Pressure: 0.6 MPa Temperature range: -80 °C to +200 °C Circumferential speed: 25m/s (no load)

Standard Radiamatic® HTS II 9535

2

0,8

0,7

0,6

0,5

0,4

0,3

0,2

0,1

05 10 15 20

Circumferential speed (m/s)

Pres

sure

(MPa

)

Pressure velocity ratioTesting period: 5–8 h, dynamic, media: heat carrier oil Operating conditions

ROTARY SHAFT SEALSProcessing on CNC-machine

Merkel Xpress manufactures customer-specific seals within a few hours. The CNC-processing saves tool costs and allows minimum order quantities.

For short notice orders, Merkel Xpress (member company of Freudenberg Sealing Technologies) uses cutting-edge manufacturing technologies to produce seals within a matter of hours – tailored to customer requirements, from individu-al prototypes to short-term replacement parts to mass production in affordable batches.

Process Seals utilizes specific high-per-formance materials to create seals and molded parts for process engineering applications. Parts of these materials can be used to fabricate semi-finished products for machining. Thanks to Merkel’s Xpress-Service, components made of the same elastomeric materials, with predictable characteristics in a specific setting, can be machined. This serves to minimize costly downtimes and allows development projects to proceed without delays.

The cooperation with Merkel Xpress also allows us to deliver seals for the process industry with branch-specific approvals even in the smallest batch sizes – in original Freudenberg materials, at extremely short notice, and without tooling costs. Even original Simmerrings can be machined: The Rapid Machined

Simmerring® (RMS) completes the com-prehensive Merkel Xpress portfolio of over 250 designs and profiles.

Available approved materials

88 NBR 156 85 EPDM 292 75 Fluoroprene® XP 40 94 AU 21730 94 AU 21420 W Flon (PTFE, virgin) EF Flon (PTFE Econol)

RMS Rapid Machined Simmerring®

3

Merkel Xpress CNC-machineSemi-finished products

Pres

sure

dire

ctio

n(M

edia

exp

osed

se

ctio

n)

H >2

15°

10-15

°

d-2

dh11

DH

8

4

Radiamatic® HTS II 9535Standard lip for conventional applicationsEven standard type features impressive low-friction performance

H >2

15°

10-15

°

d-2

dh11

DH

8

Pres

sure

dire

ctio

n(M

edia

exp

osed

se

ctio

n)

Radiamatic® HTS II 9536 SLWith an additional dust lip for use in extremely dirty environments and applications involving alternating pressure/vacuum operation

H >2

15°

10-15

°

d-2

dh11

DH

8

Pres

sure

dire

ctio

n(M

edia

exp

osed

se

ctio

n)

Radiamatic® HTS II 9538 DLWith double lip for high safety requirements Sealing lip can be flexibly adjusted

ROTARY SHAFT SEALSTypes of Seals

5

H >2

15°

10-15

°

d-2

dh11

DH

8

Pres

sure

dire

ctio

n(S

ide

expo

sed

to m

edia

)

Radiamatic® HTS II 9539 VLFree of dead space version made of PTFE Y002 with protruding sealing lip for Hygienic Design applications

H >2

15°

10-15

°

d-2

dh11

DH

8

Pres

sure

dire

ctio

n(M

edia

exp

osed

se

ctio

n)

Radiamatic® HTS II 9541 with integrated helixOffers dynamic pump-back capacity for applications involv-ing high fluid levels, completely submerged components, and those where 100% leak-free sealing is essential

>1.5

20°

10-15

°

dh11

DH

10

L –0.1

L1

T

S

>1.5

Pres

sure

dire

ctio

n(M

edia

exp

osed

se

ctio

n)

Rotary Shaft Seal WADB 9461Extremely compact shaft seal for small installation spaces

6

SPECIFIC SOLUTIONSCustomer-specific & individual

In addition to standard components, we also have developed numerous customer-specific sealing solutions. As illustrated in the following examples, we will work closely with you to design and deliver a custom-tailored sealing solution that fulfills your unique and challenging specifications.

HTS II with shortened clamping ring

In cooperation with a customer from the beverage industry we created a special sealing solution, based on the trusted and patented design of the HTS II.

Special requirements with regard to easy assembly and disassembly called for a shortened clamping ring, which substan-tially reduced the pressing force needed and greatly simplified installation. As a further advantage, this design avoids potential contact corrosion between the clamping ring and the housing.

In addition to the optimal media resis-tance offered by the FDA-compliant material, the patented sealing lip design also ensures a low friction torque.

Separable shaft seal

A joint development project with a manu-facturer of high-performance mixers and agitators produced a split lip seal for the mixer's shaft. This lip seal consists of four PTFE-segments and one O-ring, with two sealing segments set at right angles always forming a ring.

This innovative solution out of FDA-com-pliant materials can be installed without disassembling the gear. In addition to that, it is extremely wear resistant.

The front and rear sealing segments are made of PTFE Y002 and the O-ring of an FDA-compliant elastomer.

The contours of the sealing lip are based on the proven HTS II geometry, utilizing a modified version of the same functional principle.

Split lip seal

HTS II with shortened clamping ring

7

SPECIAL INSTALLATION NOTES

Our rotary shaft seals are characterized by their impressive reliability and long service life. As they have to be carefully assembled, de-tailed installation instructions are included in every shipment.

Auxiliary devices (not included)

15°

Ød+

0,4

ØD

-13

Shaft cone tool Pressing tool

We recommend using mounting tools

Surfaces

Installation surfaces must be free of grooves Ensure the installation space is clean

Housing Ra < 1,8 μm, Rt < 10 μmShaft Ra < 0,2 μm, Rt < 1 μmHardness 45-65 HRC

*The radial shaft deflection must increasingly be restrained in proportion to the rising speed involved

Tolerances

Housing bore ISO H8Shaft ISO h11Radial shaft deflection, max* ± 0,05 mm

1,5

ca.15°

ca.15°Ød-

2ØD

Ød

The installation space must be axially accessible Sharp edges should be rounded off and polished

Housing

L

THT=>L-H

Fluid side Poin

t of a

pplic

atio

n

Bore

for m

andr

el

Installation Dismantling

Leave a small gap behind the shaft seal to permit deinstallation with an extracting tool

Do not use grease on the rings / sealing lips; if necessary, oil them slightly

Freudenberg Process Seals GmbH & Co. KG Lorscher Straße 13, 69469 Weinheim, Germany Phone: +49 (0) 6201 80 8919-00 Fax: +49 (0) 6201 88 8919-69 E-Mail: fps@fst.com www.freudenberg-process-seals.com