Rotary Shaft Seals for Process Engineering Applications
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Transcript of Rotary Shaft Seals for Process Engineering Applications
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ROTARY SHAFT SEALS For Process Engineering Applications
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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)
Pressure (M
Pa)
Pressure velocity ratioTesting period: 58 h, dynamic, media: heat carrier oil Operating conditions
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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 Merkels 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
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Pressure dire
ction
(Med
ia exp
osed
section)
H >2
15
10-15
d-2
dh11
DH8
4
Radiamatic HTS II 9535Standard lip for conventional applicationsEven standard type features impressive low-friction performance
H >2
15
10-15
d-2
dh11
DH8
Pressure dire
ction
(Med
ia exp
osed
section)
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
DH8
Pressure dire
ction
(Med
ia exp
osed
section)
Radiamatic HTS II 9538 DLWith double lip for high safety requirements Sealing lip can be flexibly adjusted
ROTARY SHAFT SEALSTypes of Seals
-
5H >2
15
10-15
d-2
dh11
DH8
Pressure dire
ction
(Side ex
posed
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
DH8
Pressure dire
ction
(Med
ia exp
osed
section)
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
DH10
L 0.1
L1
T
S
>1.5
Pressure dire
ction
(Med
ia exp
osed
section)
Rotary Shaft Seal WADB 9461Extremely compact shaft seal for small installation spaces
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6SPECIFIC 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
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7SPECIAL 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
d+
0,4
D-1
3
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 m, Rt < 10 mShaft Ra < 0,2 m, Rt < 1 mHardness 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.15d-2D
d
The installation space must be axially accessible Sharp edges should be rounded off and polished
Housing
L
THT=>L-H
Fluid side Point o
f app
lication
Bore fo
r man
drel
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
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Freudenberg Process Seals GmbH & Co. KG Lorscher Strae 13, 69469 Weinheim, Germany Phone: +49 (0) 6201 80 8919-00 Fax: +49 (0) 6201 88 8919-69 E-Mail: [email protected] www.freudenberg-process-seals.com