PRECISION I RELIABILITY I PERFORMANCE
Severn Leeds OCT® Oblique Cone Technology
Triple Offset Control Valve
Contents
Introduction 01
OCT® – The Art of Control 02
Applications 04
Tested for the Rigours of Critical Service Control 05
With over 50 years’ experience, the Severn Glocon Group plc provides
world-class engineered valve products and services to process plants
across the globe. The Severn Leeds brand is recognised globally for
innovative butterfly valve solutions for critical shut off and control applications.
Severn Leeds Manufacturing facilities in the UK, Brighouse and Chennai, India
Brighouse, UK
Chennai, India
OCT® Oblique Cone Technology
Triple Offset Control Valve
The Severn Leeds OCT® may be the first triple offset butterfly valve
designed from the outset to provide the ultimate in cutting edge butterfly
control valve technology.
Incorporating the 50 years’ experience in butterfly control of Severn
Glocon Group and allied to real market feedback via the Groups’ “repair
intelligence” capability, each facet of the valve has been designed to
provide the most accurate, reliable and robust service capability possible:
Maximised bore valve with high CV and truly circular geometry
Low dynamic & sealing torque
Available with a range of low noise & anti-cavitation trims
Sealing rates for FCI 70.2 Class II to Class VI
Laminated & solid seal designs with a multitude
of sealing materials to suit all applications
Actuated packages are supplied fully assembled and tested
for peace of mind installation
Fully in-field serviceable
Severn Leeds OCT® Oblique Cone Technology
01
OCT® – The Art of Control
The simplicity and ingenuity of OCT®
represents the next generation
of our pursuit of providing the
ultimate in butterfly control
valve technology.
Severn Leeds
OCT® Technology
Traditional Triple Offset Design
Elliptical seal geometry
1st & 2nd
OFFSETS
3rd
OFFSET
With traditional triple offset valve
geometry, an elliptical disc seal is
effectively cut from a rotated cone
OCT® – Breaking Tradition
1st & 2nd
OFFSETS
3rd
OFFSET
The patent pending OCT® design is based on an ‘infinite circle’ based geometry. By this method we avoid having
to consider ellipses and can achieve a perfectly circular ‘patent pending’ triple offset geometry.
This simple yet elegant solution to TOV geometry allows a sealing area to be created using an ever decreasing set
of perfect circles, giving full bore capability without the flat spot typically seen on most triple offset butterfly valves.
02
Severn Leeds OCT® Oblique Cone Technology
Process Benefits
Internal bolting removed or
minimised to avoid risk of
vibration loosening
Disc shaped and optimised
for smooth fluid flow control
Direct anti-cavitation trim
capability for increased pressure
recovery, lower noise and
reduced dynamic torques
Circle geometry maximises
Cv without compromising
sealing capability
Floating disc ensures excellent
operational temperature capability
Low emission gland to
ISO15848 Part 2, class B
Hard facing options for
maximum wear resistance
on abrasive service
Severn Leeds OCT® Oblique Cone Technology
03
A commitment to process
understanding, ensuring the optimum
valve, whatever the application
Fire testing CFD
FEA
All materials are selected
to give excellent corrosion
resistance and maximum
service life
High Grade seals designed
to optimise performance
Bespoke designs to meet
non-standard specifications
Cryogenic
testing
Actuated packages are
supplied fully assembled
and tested for peace of
mind installation
15848 packing
Applications
The Severn Leeds OCT® may be the first triple offset butterfly valve designed from
the outset to provide the ultimate in cutting edge butterfly control valve technology.
Examples Include
Offshore Platform & FPSO
Seawater lift pump back
pressure control
Ballast water flow control
Hydrocarbon gas flow control
Fire main bypass control
04
Refinery
Flare gas control
Flow Balancing for Fiscal Metering
Power Generation
LP & MP Steam control
Cooling water flow & back
pressure control
Cooling Tower de-icing
Severn Leeds OCT® Oblique Cone Technology
LNG Storage & Transportation
Loading & unloading flow control
LNG Recirculation control
LNG Tank flow control
Urea, Ammonia & Fertilizer Production
Synthesis gas flow control
Urea flow control
HP steam pressure reduction
Tested for the Rigours
of Critical Service Control
3D print
Designed for Life – Using the
latest 3D and FEA technology
the Severn Leeds butterfly
control valve is designed with a
maintenance free long life in mind.
CFD
Technical Data
Design
ANSI B16.34, API 609
Testing
API 598, BS 51551, FCI 70.2
Flange Drillings
ANSI, MSS, DIN & BS
Size Range
Cycle
testing
2″ to 72″ (50mm to 1800mm)
Body Ratings
150lb to 2500lb (DIN 10 to 400)
Temperature Range
– 200 ̊C to + 800 ̊C
Body Type
Wafer, Lugged, Flanged,
Clamp Hub & Butt Weld
Flow testing
NACE
MR0103 & MR0175, ISO 15156
Fugitive Emission
ISO 15848, Shell 77/312
Desalination
Seawater make up
level control
Brine Recycle
Brine blow down
Condensate back
pressure control
Distillate back pressure
and flow control
Severn Leeds OCT® Oblique Cone Technology
05
06
07
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04
08
03
01
09
21
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11
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[email protected]
www.severnglocon.com
www.leeds-valve.com
PRECISION I RELIABILITY I PERFORMANCE
Olympus Park Quedgeley Gloucester
Gloucestershire GL2 4NF England
T. +44 (0)845 223 2040 F. +44 (0)845 223 2041 [email protected] www.severnglocon.com
The Severn Glocon Group policy is one of continuous improvement and
we reserve the right to modify these specification details without notice.
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