Seal Technology · ROTEN
Mechanical Seals
Plant Equipment is the authorised Thailand distributor of ROTEN mechanical seals — made in Milan, Italy, since 1945. Single, double, cartridge and bellow seals for food, chemical, pharmaceutical and water applications.
ISO 9001 since 1993 · ISO 14001 since 2007
By application
Find the right seal for your process
ROTEN's own recommendations per industry. Each type opens on roten-seals.com.
Food industry
Chemical industry
Pharmaceutical industry
Product range · 01
General-purpose single seals
Proven single-spring designs for water, food, chemicals and hydrocarbons.
Type 2
ROTEN's original seal, patented 1957 — general duty on water, food, chemicals and hydrocarbons.
p ≤ 16 bar · t = –35 … 180°C · v ≤ 15 m/s
Type 3
Economical seal with interchangeable parts; ceramic/carbon faces cope with dirty liquids.
Type 4
PTFE gaskets with stainless steel parts for most fluids within its design limits.
p ≤ 12 bar · t = 10 … 180°C · v ≤ 12 m/s
Type 45
Type 5 faces and metal parts combined with the PTFE gaskets of Type 4.
Type 5
Only the wearing faces need replacing at overhaul; alumina, tungsten carbide or SiC faces.
Type E
Balanced seal for high-pressure fluids; e4 with PTFE gaskets, e5 with replaceable faces.
p ≤ 40 bar · t = –35 … 180°C · v ≤ 15 m/s
Product range · 02
Bidirectional and compact seals
Unaffected by rotation direction, short axial length, internal or external mounting.
Type 7
External mounting — spring and sleeve stay out of the pumped liquid; works against internal pressure.
Type 7K
Bidirectional with short axial length; internal or external mounting, also against pressure.
p ≤ 12 bar · t = –35 … 180°C · v ≤ 15 m/s
Type 82-84
Bidirectional seals with positive drive by set screws locking onto the shaft.
p ≤ 12 bar · t = –35 … 180°C · v ≤ 15 m/s
Type 85
Interchangeable faces as on Type 5, plus bidirectional rotation and minimal axial length.
Type 85E
Balanced version of Type 85 that runs on a straight shaft without a balancing step.
p ≤ 40 bar · t = –45 … 200°C · v ≤ 12 m/s
Type 875DT
Type 85 faces with Type 7K mechanical drive; compact, mounts inside or outside the medium.
p ≤ 16 bar · t = –45 … 200°C · v ≤ 15 m/s
Type 877
Compact bidirectional seal from the 875 family with massive interchangeable faces.
Type 8E
Compact, balanced, bidirectional seal with screw drive and a wide choice of materials.
p ≤ 40 bar · t = –35 … 180°C · v ≤ 15 m/s
Type EHS
Balanced and bidirectional; the spring is kept out of contact with the sealed medium.
p ≤ 40 bar · t = –35 … 230°C · v ≤ 15 m/s
Product range · 03
Double seals
Pressurised back-to-back arrangements for hazardous or difficult media.
Type 822 – 842 – 844
Double pressurised back-to-back multi-spring seal; 822 with O-rings, 842/844 with PTFE options.
p ≤ 16 bar · t = –35 … 180°C · v ≤ 15 m/s
Product range · 04
Cartridge seals
Pre-assembled, set at the factory — no installation dimensions to check on site.
Type 600SL
Single balanced cartridge with flush and no sleeve; springs out of the medium.
p ≤ 30 bar · t = –35 … 200°C · v ≤ 15 m/s
Type 902
Single balanced cartridge with flush — a direct replacement for packing on older pumps.
p ≤ 30 bar · t = –35 … 200°C · v ≤ 15 m/s
Type 922
Double balanced cartridge with barrier-fluid flush for sticky, hot or very dirty media.
p ≤ 30 bar · t = –35 … 200°C · v ≤ 15 m/s
Type 942
Double balanced cartridge with barrier-fluid capability for critical duties.
p ≤ 30 bar · t = –35 … 200°C · v ≤ 15 m/s
Type 972
Double balanced cartridge with barrier-fluid capability and a reduced flange.
p ≤ 30 bar · t = –35 … 200°C · v ≤ 15 m/s
Type 977-977A
ATEX Category 1 cartridge (TÜV certified) with thermocouples to monitor face temperature.
p ≤ 40 bar · t = –50 … 300°C · v ≤ 0-5 m/s
Product range · 05
Rubber bellow seals
Compact elastomer-bellow seals, widely used on water and general service pumps.
Type L2
Rubber bellow with positive drive through the spring; unbalanced, rotation-dependent.
p ≤ 12 bar · t = –35 … 180°C · v ≤ 15 m/s
Type L3
Rubber bellow driven by friction on the shaft; SiC/SiC or carbon/SiC faces.
p ≤ 10 bar · t = –10 … 120°C · v ≤ 10 m/s
Type L4
Rubber bellow, friction drive, SiC/SiC or carbon/SiC faces.
p ≤ 10 bar · t = –10 … 120°C · v ≤ 10 m/s
Type L4KS1
L4-family rubber bellow seal, friction drive.
p ≤ 10 bar · t = –10 … 120°C · v ≤ 10 m/s
Type L5
Rubber bellow with carbon/ceramic/NBR or SiC/SiC/FPM faces.
p ≤ 10 bar · t = –10 … 100°C · v ≤ 10 m/s
Product range · 06
Metal bellow seals
No dynamic O-ring on the shaft — for extreme temperatures and media that attack elastomers.
Type R580
Welded metal bellow with no dynamic O-ring on the shaft; good balancing from the bellow form.
p ≤ 20 bar · t = –50 … 280°C · v ≤ 15 m/s
Type R590
Welded metal bellow with carbon packing gasket for very high and very low temperatures.
p ≤ 20 bar · t = –70 … 350°C · v ≤ 15 m/s
Type R7F
Type RF
Metal bellow for very high or very low temperatures where elastomer or PTFE gaskets fail.
p ≤ 8 bar · t = –70 … 350°C · v ≤ 10 m/s
Product range · 07
Hygienic seals
For food, pharmaceutical and sterile processes.
Hygienic food seals
Seal types designed for hygienic, pharmaceutical, sterile and food applications.
Product images and data: ROTEN srl, Milan · roten-seals.com
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Pump model, shaft size, medium, temperature and pressure — we recommend the right ROTEN type and quote from Bangkok.