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Velan Torqseal Triple-Offset Metal-Seated Butterfly Valves NOTE: This is a condensed catalog. For a complete
version of this catalog, please contact Velan directly. VELAN COMPANY PROFILE
Velan is one of the world's leading manufacturers of industrial steel valves,
supplying gate, globe, check, ball, butterfly and knife gate valves for critical
applications in the chemical, petrochemical, oil and gas, fossil and nuclear
power, cogeneration, pulp and paper and cryogenic industries. See the back
cover of this catalog for a summary of the many quality products that Velan
designs and manufactures.
Founded in 1950, Velan earned a reputation for excellence as a major supplier of
forged valves for nuclear power plants and the U.S. Navy. Velan Inc. pioneered
many designs which became industry standards, including bellows seal valves,
all stainless steel knife gate valves and forged valves up to 24".
Velan valves are manufactured in 13 specialized manufacturing plants,
including six in Canada & U.S.A., four in Europe and three in Asia.
We have a total of 1,450 employees, 75% of whom are located in
our North American operations.
John Leduc, Product Sales Manager Butterfly Valves
Velan has Sales offices and distributors located worldwide.
Visit the Velan website at www.velan.com for an updated contact list.
NOTE: The material in this catalog is for general information. For specific performance data and proper material selection, consult your
Velan representative. Although every attempt has been made to ensure that the information contained in this catalog is correct,
Velan reserves the right to change designs, materials or specifications without notice.
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CONTENTS
Zero leakage Butterfly Valves............................3
Applications in Major Industries ......................4
Principle of Operation ........................................5
Valve Design Features ...................................... 6
Stem Seal Technology ....................................7-8
Valve Parts and Materials to
ASTM Standards ..................................................9
Metal-seated Butterfly Flanged
Type Valves, 3 48 (80 1200 mm) .......... 1011
Metal-seated Butterfly Wafer and Lug
Type Valves, 3 48 (80 1200 mm) ................ 12
Air & Electric Actuators ....................................13
Engineered Solutions ........................................13
Stem Extensions & Steam Jackets ................14
Optional Bearing Lubrication &
Special Cleaning ................................................14
Qualification Testing ....................................15-16
Fire Testing ..........................................................17
Engineering Data................................................18
How to Order ......................................................19
NOTE: This is a condensed catalog. For a complete
version of this catalog, please contact Velan directly. Valves fire tested to API 607, Fourth Edition (see pg. 18).
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Product range in Carbon and Alloy Steel, 316 Stainless, Duplex, Monel,
Hastelloy, Inconel, Alloy 20 and Titanium.
VELAN TRIPLE-OFFSET - ZERO LEAKAGE BUTTERFLY VALVES
3 48
(80 1200 mm)
ASME Classes
150600
Face-to-face
to ISO 5752
3 48
(80 1200 mm)
ASME Classes
150600
Gate valve
Face-to-face
to B16.10
Body conforms to
API 600 wall thickness
FLANGED
LONG PATTERN
TO B16.10
FLANGED
SHORT PATTERN
TO ISO 5752
WAFER TYPE
TO API 609
LUG TYPE
TO API 609
3 48
(801200 mm)
ASME Classes
150600
Face-to-face
to API 609
3 48
(80 1200 mm)
ASME Classes
150600
Face-to-face
to API 609
NOTE: This is a condensed catalog. For a complete
version of this catalog, please contact Velan directly. APPLICATIONS IN MAJOR INDUSTRIES
NUCLEAR POWER PLANTS
Containment Isolation
Saltwater Service
Core Spray Systems
Pump Isolation
(Velan holds the ASME N-stamp)
PULP AND PAPER
Steam Isolation, Boiler Water
Black and White Liquors
Oxygen Lines
Lime and Slurries
PETROCHEMICAL PLANTS
Brine, CO
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Vapor,
Propylene Plants
Steam Service
Oxygen Service
Hydrogen Gas,
Flare Inlet and
Propane Gas
Maniford Isolation
Ethylene Plants
PSA & Molecular Sieves
Ethylene Crackers
Coker Plants
CRYOGENICS
All Liquid Gases
Oilfield Recovery
Liquid Natural
Gasification Plants
Gas Service
and Storage
LNG Ships
Tank Farm Isolation
PETROLEUM REFINING
Oil Storage Isolation
Steam Supply Valves
Hot Cracking Gas
Catalytic Cracker Units
Flare Gas Hydrogen,
Desulphurization Systems
Sour Gas Isolation
and Tail Gas Treaters
Product Segregation
FOSSIL POWER PLANTS
Pump Isolation
Condenser Cooling
Pump and Steam Extraction Isolation
Heat Exchanger, Condenser Cooling Isolation
District Heating and Cooling
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NOTE: This is a condensed catalog. For a complete
version of this catalog, please contact Velan directly. 5
THE TRIPLE-OFFSET GEOMETRY
OFFSET 1: The shaft is offset behind the seat axis to allow
complete sealing contact around the entire seat
OFFSET 2: The shaft centerline is offset from the pipe and valve
which provides interference free opening and closing
of the valve
OFFSET 3: The seat cone axis is offset from the shaft centerline
to eliminate friction during closing and opening and
to achieve uniform compressive sealing around the
entire seat.
THE LAMINATED DISC SEAL
Seating forces are generated by the torque during closing
uniformly around the entire circumference. The resilient seal
flexes and energizes, assuming the shape of the seat. The
compression forces equally distributed around the perimeter
provide a tight bi-directional shut off. The resiliency of the
seal allows the valve body and disc to contract or expand,
without the risk of jamming due to temperature fluctuations.
It is self-adjusting.
The Velan Triple-Offset Butterfly Valve provides a bi-directional bubble tight shut-off. This
geometry ensures that the disc seal contacts the body seat only at the final shut-off position
without rubbing or galling, providing a torque generated resilient seal with sufficient wedging
to ensure a uniform seal contact.
PRINCIPLE OF OPERATION
FRICTION FREE SEALING FOR LONG CYCLE LIFE
Retainer
ring
Disc
Gasket
(2)
Hardfaced seat
(1)
Body
Laminated
disc seal
Radial Loading
Velan provides an extra rigid retaining ring with
bolting, resulting from ASME stress calculations.
(1) Seat is hardfaced with Stellite as standard.
(2) The gasket is spiral wound SS/Graphite for zero leakage
NOTE: This is a condensed catalog. For a complete
version of this catalog, please contact Velan directly. 6
Raised, conical seat prevents solids build-up from
interfering with seal. Seat is hardfaced with
Stellite to meet severe service (in lieu of soft
316SS hardfacing).
STANDARD LAMINATED
RESILIENT DISC SEAL TO
800°F (427°C)
One to four graphite layers
are carefully assembled
between stainless steel rings
and graphite using phenolic
resin bond. Solid seal rings
are available for abbrasive
services as well as high
temperature applications up
to 1112ºF (600ºC).
"ZERO LEAKAGE" - SEAT TIGHTNESS
(API 598 RESILIENT SEAT STANDARD)
The disc seal, evenly compressed around its
circumference, produces a wedging effect which
flexes the seal ring and reacts like a spring. The
resilient seal assures "zero leakage" of liquids or
gases to API 598 - resilient seat standard. Resiliency
in the seal allows disc movement during thermal
cycles while retaining tight shutoff as shown.
NO CAVITY There is no cavity to allow build-up of
solids.
ONE-PIECE SHAFT Large diameter shaft for safety
is connected to the disc close to the bearings to
absorb loads with taper pin and key to allow for
differential expansion due to temperature.
SHAFT BEARINGS The shaft is centered on two
long bearings, chromed, nitrided, or as stellite
(option) protected against the entrance of solids by
bearing seals which are standard on Torqseal valves.
LOW EMISSION SHAFT SEALS 0 100 ppm
Shaft is burnished to 8 RMS, ID of packing
chamber finish 32 RMS. Live-loading available for
long maintenance free service. Easy access for
packing adjustment. (See page 6 for details and
alternative stem seals.)
CERTIFIED TO API 591, PED AND ASME N.
The Torqseals advanced design features three-way eccentricity and unique elliptical seat
geometry ensuring compressive sealing around the entire seat and a tight, bubble free valve.
VALVE DESIGN FEATURES
STELLITE HARDFACED SEAT
External
Internal
Internal
Detail A
LOAD
HP
HP
NOTE: The valve is marked HP for the preferred pressure side
when installing the valve (shaft side is the high pressure side for
flow assisted sealing). Valve is bi-directional
Detail A
TRIPLE SHAFT BLOWOUT PROTECTION
CONFORMS TO API 609
NOTE: This is a condensed catalog. For a complete
version of this catalog, please contact Velan directly. 7
1) Short and narrow packing chamber
Maximum 5 rings,
1
/
4
" wide.
2) Large compression load required
Graphite rings precompressed to 4000 psi
for effectiveness of all rings. Gland torque must
be maintained after installation and in service to
levels shown