VELAN COMPANY PROFILE

Velan is one of the world's leading manufacturers of industrial

valves, supplying forged and cast steel gate, globe, check, CONTENTS
ball and knife gate valves for critical applications in the Manufacturing Plants ............................................................1
chemical, petrochemical, oil and gas, fossil and nuclear Standard Knife Gate Valve Features ....................................2
power, cogeneration, pulp and paper and cryogenic Standard Knife Gate Valve,TAPPI ....................................3-4
Standard Knife Gate Valve, Flanged......................................5
industries. Bolted Bonnet Knife Gate Valve Features ........................6-7
Founded in 1950, Velan earned a reputation for excellence as Bolted Bonnet Knife Gate Valve ........................................8-9
a major supplier of forged valves for nuclear power plants and Knife Gate Valve Options ......................................................10
the U.S. Navy. Velan, Inc., pioneered many designs which Knife Gate Valve Seating Technology & Design Details ....11
became industry standards, including bellows seal valves, all Knife Thickness & Seat Maintenance ................................12
Typical Bolted Bonnet Knife Gate Valve Applications ....13
stainless steel knife gate valves and forged valves up to 24". Actuators ................................................................................14
Velan valves are manufactured in 11 specialized plants, Specialties: Throttle Valves ..................................................15
including four in Canada, two in the U.S., and one each in Tilting Disc Check Valves ................................16
France, Portugal, Korea and Taiwan. We have a total of How to Order ..........................................................................17
1,116 employees in North America and 360 overseas.

Velan’s valve distributors are located worldwide.

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.
 STANDARD KNIFE GATE VALVE DESIGN FEATURES

ADVANTAGES OVER FABRICATED VALVES

1. Cast stainless steel body and yoke. Leakage of corrosive medium due to neglected packing chamber
or line pressure surges causes corrosion and failure of the carbon steel components.
2. The one-piece stainless steel casting is stronger than a welded assembly and less subject to distortion
due to thermal stresses, resulting in:
● Longer packing chamber life without leakage.
● Less seat leakage.
● Less chance for body and knife gate to seize.

FIRST ALL STAINLESS STEEL KNIFE GATE VALVE

● Rugged one-piece body including flanges.
Cast in stainless steel to eliminate corrosion problems that are found
with cast iron, or steel valves lined with stainless steel.
● First all stainless steel cast yoke.
● Cast stainless steel gland to eliminate corrosion that are found
with cast iron plastic coated gland.
THICKER KNIFE GATE
● Thicker knife gate to eliminate distortion under maximum differential
pressure and provide a tight seat (see page 12).
● Precision ground blade on both sides for tighter packing chamber
sealing. Sealing face of the gate is lapped to provide the best
possible seat tightness.
● Precision machined beveled gate end provides shearing
action for heavy stock slurry application.
● Gate guides and lugs. 180° guiding for the moving gate,
while jambs at the bottom hold the knife gate to
assure proper seating.
RAISED FACE SEAT
● The groove around the seat permits the gate to push
particles aside and prevents clogging.
When the valve is open the flow cleans the groove.
● Lapped seat ensures tight closure.
RELIABLE PACKING CHAMBER
● Smooth and uniform chamber.
● Gate ground on both sides.
● Equally distributed gland bolts provide uniform
compression of packing.
● Gland bolts easily accessible.
ALL NUTS SELF-LOCKING
LOW TORQUE STEM DRIVE ASSEMBLY
● Ni-resist or bronze thrust bearing to prevent seizure
of handwheel hub, 2 – 12" valves.
● Needle thrust bearings, 14 – 36" valves.
● Larger malleable iron handwheel for easier operation.
● Grease fitting.
● Acid resistant Ni-resist or bronze stem nut.
* For options
FACTORY TESTING see page 10.
● Each valve is pressure tested for seat tightness,
shell and packing integrity including cycling tests to check for reliability of operation.

2
 ALL STAINLESS STEEL STANDARD KNIFE GATE VALVES
WAFER-TYPE, METAL SEAT, 2–36" (50–900 mm)
FULLY LUGGED, TYPE 310C TO TAPPI TIS 405-8, FULL PORT

DESIGN FEATURES:
● Designed to handle slurries, pulp stock and
corrosive fluids in process industries.
● Non-clogging full port design.
● Meets TAPPI standard TIS 405-8 and MSS SP-81 for
wafer-type knife gate valves.
● Flanges match ASME B16.5 class 150. Holes tapped.
● 150 psig max. working pressure.
150°F max. working temperature.
Applications outside of these conditions require
special design considerations.
● Factory installed V-port seat insert available for
metering or throttling service (page 10).
● These high quality metal-seated knife gate valves
with ground knife gates and lapped seating faces
have maximum leakage rate 4-10 times less than the
permissible rates shown in TAPPI 405-8 & MSS SP-81.
● Needle bearings on 14–36" valves.
● Available with lever, chain, gear, electric, air or
hydraulic actuation (see page 14).

DIMENSIONS AND WEIGHTS

SIZE Tap No. V-Port
in
mm A C BD size
in (UNC)
of
Holes D D1 E O Area
in2/cm2
2 1.88 3.62 4.75 14.31 16.50 10.00 1.94 1.67
50 48 92 121 0.63-11 4 363 419 254 49 11
3 2.00 5.00 6.00 15.06 18.19 10.00 2.94 3.84
80 51 127 152 0.63-11 4 383 462 254 75 25
4 2.00 6.19 7.50 16.19 20.38 10.00 3.94 6.90
100 51 157 191 0.63-11 8 411 518 254 100 45
6 2.25 8.50 9.50 22.81 28.81 14.00 5.75 14.71
150 57 216 241 0.75-10 8 579 732 356 146 95
8 2.75 10.62 11.75 24.25 32.25 14.00 7.88 27.62
200 70 270 298 0.75-10 8 616 819 356 200 178
10 2.75 12.75 14.25 31.13 41.19 18.00 9.88 43.42
250 70 324 362 0.88-9 12 791 1046 457 251 280
12 3.00 15.00 17.00 32.63 44.75 18.00 11.75 61.41
300 76 381 432 0.88-9 12 829 1137 457 298 396
14 3.00 16.25 18.75 39.94 53.75 20.00 13.25 78.09
350 76 413 476 1.00-8 12 1014 1365 508 337 504
16 3.50 18.50 21.25 42.06 57.75 20.00 15.25 103.44
400 89 470 540 1.00-8 16 1068 1467 508 387 667
18 3.50 21.00 22.75 50.00 67.63 24.00 17.25 132.35
450 89 533 578 1.12-7 16 1270 1718 610 438 854
20 4.50 23.00 25.00 52.68 72.63 24.00 19.25 164.82
500 114 584 635 1.12-7 20 1338 1845 610 489 1063
24 4.50 27.25 29.50 60.18 84.00 30.00 22.88 232.83
600 114 692 749 1.25-7 20 1529 2134 762 581 1502
30 5.50 33.75 36.00 72.50 101.63 28.75 367.63
750 140 857 914 1.25-7 14(2) 1842 2581
(1)
730 2372
36 6.00 40.25 42.75 (2) 86.75 121.75 (1) 34.75 537.09
900 152 1022 1086 1.50-6 16 2203 3092 883 3465
(1) Gear actuators. (2) Hole spacing meets MSS SP-44.

3
 ALL STAINLESS STEEL STANDARD KNIFE GATE VALVES
WAFER-TYPE, RESILIENT SEAT, 2–36" (50–900 mm)
FULLY LUGGED, TYPE 320C TO TAPPI TIS 405-8, LARGE PORT

DESIGN FEATURES:
● Designed to handle slurries, pulp stock and
corrosive fluids in process industries where
applications call for resilient seat with O-leakage
to 150 psi in main direction and limited tightness
in opposite direction,at low pressure.

● Replaceable, resilient crimped seat rings.

● Meets TAPPI standard TIS 405-8 and MSS SP-81

for wafer-type knife gate valves.

● Replaceable seat extends the service life of the

valve.Resilient seats can be easily replaced after
removing valve from the line (Details on page 12).

● For highly abrasive applications we can supply a

replaceable seat ring with a hardfaced knife surface.

● Non-clogging large port.

● 150 psig max. working pressure.

150°F max. working temperature.
Applications outside of these conditions require
special design considerations.

● Needle bearings on 14"-36" valves.

● Available with lever, chain, gear, electric, air or

hydraulic actuation (see page 14).

DIMENSIONS AND WEIGHTS CV & SEAT TIGHTNESS

SIZE Tap No. LEAKAGE(2) (cc/min.)
SIZE STANDARD
in
mm A C BD Size
in (UNC)
of
Holes D D1 E O (in) CV(1) MAIN SEAT
1-150 PSI
2 1.88 3.62 4.75 4 14.31 16.50 10.00 1.84
50 48 92 121 0.63-11 363 419 254 47 2 330 0
3 2.00 5.00 6.00 4 15.06 18.19 10.00 2.47
80 51 127 152 0.63-11 383 462 254 63 3 670 0
4 2.00 6.19 7.50 8 16.19 20.38 10.00 1.00
100 51 157 191 0.63-11 411 518 254 25 4 1,300 0
6 2.25 8.50 9.50 8 22.81 28.81 14.00 5.59
150 57 216 241 0.75-10 579 732 356 142 6 3,300 0
8 2.75 10.62 11.75 8 24.25 32.25 14.00 7.59
200 70 270 298 0.75-10 616 819 356 193 8 6,400 0
10 2.75 12.75 14.25 12 31.13 41.19 18.00 9.59
250 70 324 362 0.88-9 791 1046 457 244 10 10,300 0
12 3.00 15.00 17.00 12 32.63 44.75 18.00 11.34
300 76 381 432 0.88-9 829 1137 457 288 12 15,000 0
14 3.00 16.25 18.75 12 39.94 53.75 20.00 12.84
350 76 413 476 1.00-8 1014 1365 508 326 14 19,000 0
16 3.50 18.50 21.25 16 42.06 57.75 20.00 14.84
400 89 470 540 1.00-8 1068 1467 508 377 16 25,000 0
18 3.50 21.00 22.75 16 50.00 67.63 24.00 16.81
450 89 533 578 1.12-7 1270 1718 610 427 18 33,600 0
20 4.50 23.00 25.00 20 52.68 72.63 24.00 18.81
500 114 584 635 1.12-7 1338 1845 610 478 20 42,000 0
24 4.50 27.25 29.50 20 60.18 84.00 30.00 22.78
600 114 692 749 1.25-7 1529 2134 762 579 24 59,000 0
30 5.50 33.75 36.00 14(2) 72.50 101.63 (1) 28.25 30 95,000 0
750 140 857 914 1.25-7 1842 2581 718
36 6.00 40.25 42.75 16(2) 86.75 121.75 (1) 34.25 36 138,000 0
900 152 1022 1086 1.50-6 2203 3092 870
(1) Gear actuators. (2) Hole spacing meets MSS SP-44. (1) Tested in accordance with ASME/ISA-575-02.
(2) Test pressure 40 psi water (TAPPI and MSS SP81).
4
 ALL STAINLESS STEEL STANDARD KNIFE GATE VALVES
FLANGED, RESILIENT OR METAL SEAT, 2–24" (50–600 mm)
TYPE 322C THROUGH-BOLTED FLANGES
ASME B16.5 CLASS 150, LARGE PORT

DESIGN FEATURES:
● Designed to handle heavy slurries, pulp stock and
corrosive fluids in process industries.
● Cast in austenitic stainless steel
(30", 36" may be fabricated).
● Has through-bolted, rigid flanges matching
B16.5 class 150 regular, short-body type.
● Non-clogging full port design (metal seated valve).
● 150 psig max. working pressure.
150°F max. working temperature.
Applications outside of these conditions require
special design considerations.
● The high quality metal seated knife valve with
ground and lapped seating face have maximum
leakage rates 4-10 times less than the permissible
rates shown in TAPPI TIS 405-8 and MSS SP-81.
● Available with lever, chain, gear, electric, air or
hydraulic actuation (see page 14).

Resilient seat design shown

integral metal seats also available

DIMENSIONS AND WEIGHTS

SIZE Bolt No. O O V-Port THE DETAIL BELOW
For CV and
in
mm
A C BD Hole
in/mm
of
Holes D D1 E Metal
Seat
Res.
Seat
Area
in2 /cm2 seat tightness SHOWS THE INTEGRAL
see chart on pg. 3 METAL SEAT OPTION
2 5.50 3.62 4.75 0.75 14.31 16.50 10.00 1.94 1.84 1.67
50 140 92 121 19.1 4 363 419 254 49 47 11 for metal seat and
3 6.00 5.00 6.00 0.75 15.06 18.19 10.00 2.94 2.47 3.84 pg. 4 for resilient seat
80 152 127 152 19.1 4 383 462 254 75 63 25
4 6.25 6.19 7.50 0.75 16.19 20.38 10.00 3.94 1.00 6.90
100 159 157 191 19.1 8 411 518 254 100 25 45
6 6.75 8.50 9.50 0.88 22.81 28.81 14.00 5.75 5.59 14.71
150 171 216 241 22.2 8 579 732 356 146 142 95
8 7.00 10.62 11.75 0.88 24.25 32.25 14.00 7.88 7.59 27.62
200 178 270 298 22 8 616 819 356 200 193 178
10 7.37 12.75 14.25 1.00 31.13 41.19 18.00 9.88 9.59 43.42
250 187 324 362 25.4 12 791 1046 457 251 244 280
12 8.00 15.00 17.00 1.00 32.63 44.75 18.00 11.75 11.34 61.41
300 203 381 432 25.4 12 829 1137 457 298 288 396
14 8.50 16.25 18.75 1.12 39.94 53.75 20.00 13.25 12.84 78.09
350 216 413 476 28.5 12 1014 1365 508 337 326 504
16 9.00 18.50 21.25 1.12 42.06 57.75 20.00 15.25 14.84 103.44
400 229 470 540 28.5 16 1068 1467 508 387 377 667
18 10.00 21.00 22.75 1.25 50.00 67.63 24.00 17.25 16.81 132.35
450 254 533 578 31.8 16 1270 1718 610 438 427 854
20 10.50 23.00 25.00 1.25 52.68 72.63 24.00 19.25 18.81 164.82
500 267 584 635 31.8 20 1338 1845 610 489 478 1063
24 11.00 27.25 29.50 1.38 60.18 84.00 30.00 22.88 22.78 232.83
600 279 692 749 35.0 20 1529 2134 762 581 579 1502

5
BOLTED BONNET KNIFE GATE VALVE DESIGN FEATURES
NO LEAKAGE TO THE EXTERIOR THROUGH PACKING CHAMBER
(UNLIKE STANDARD KNIFE GATE VALVES)
● Bonnetted design.
Standard body-bonnet joint with an efficient non-asbestos reinforced fiber or PTFE gasket.
● Long-life leakproof stem seal.
Standard packing chamber with 125 RMS wall finish, U.S. Patent # 5295661
burnished non-rotating stem and Teflon or graphite
packing rings. Many times the cycle life of
a standard knife gate valve.
● Virtually no contamination of the environment.
No dewatering of stock, unlike standard knife gate valves.
● Easy repacking in-line.

TIGHTER SEATS WITH PATENTED TORQUE CLOSURE OF KNIFE

● Beveled knife-stem connection locks the knife blade tight
against the seat. The seat is sealed by positive torque
closure – not media pressure – unlike any other knife gate valve.
● Raised-face seat. A groove around the seat collects particles
pushed aside by the knife and prevents clogging.
When the valve opens, media pressure cleans the groove.
● Lapped seat ensures tight closure.
● New crimped resilient seat ensures longer service life (see pg.11).
● Four seat designs: Integral, resilient and
renewable Stellite 6 (see pg. 10).

BYPASS TO PREVENT CLOGGING OF BONNET

● Bypass lets pulp circulate inside the bonnet when valve is opened,
preventing clogging (patent # 2093539 CDN and # 5295661 U.S.).

EASY OPERATION
● Lower running torque due to reduced friction.
Friction between stem and packing in bolted bonnet knife
gate valve is far less than the friction between the blade
and the packing in a standard knife gate valve.
● Low-friction, acid-resistant Ni-Resist stem nut.
● Valves can operate with smaller actuators
than standard knife gate valves.

ALL CAST STAINLESS STEEL DESIGN

● One-piece stainless steel, fully-lugged, cast body is stronger than
welded bodies and less subject to distortion due to thermal stress.
Posts are stainless steel instead of chrome-plated carbon steel
for longer life.
● Designed for vertical or horizontal line operations.
● Standard wafer, TAPPI face-to-face for easy replacement
of leaky standard knife gate valves.
● Maintenance and adjustment-free. Long cycle life.
● Suitable for most pulp and paper applications.
Can be used throughout the mill as a general-purpose knife gate valve.

6
 THE VELAN BOLTED BONNET KNIFE GATE VALVE
PROVIDES POSITIVE SEATING
ON THE BOTTOM AND THE TOP OF THE BLADE
● Patented knife – stem ● Handwheel torque or two bottom lugs. The taper
connection. actuator force provides stem head then transfers a
Unlike any other design, positive seat-knife closure. vertical closing force to a
the stem head slides inside During closure, the stem lateral force which positively
a circular cavity on the stem slides down pushing the seats the knife against the
guides in the body and knife into contact with the seat face. Stem force, not
bonnet, and is connected line pressure, maintains
to the knife blade by a taper seating contact in this
slot. A cam follower unique design, ensuring
prevents the stem tight seating in both
from rotating. directions (see alternative
seat designs on page 10).
During the opening and
closing cycle, the guides
ensure proper alignment of
the knife.

THE BONNET & BODY

ARE SPECIALLY
DESIGNED TO PERMIT
PULP CIRCULATION
CAM THIS PREVENTS
FOLLOWER
CLOGGING

VALVE

SEAT

KNIFE

BODY LUGS

7
 ALL STAINLESS STEEL BOLTED BONNET
KNIFE GATE VALVES, FULL PORT, 6–24" (150–600 mm)
FOR BIDIRECTIONAL SHUTOFF UP TO 150 PSI, FULLY LUGGED,
TYPE 310B METAL SEAT

DESIGN FEATURES:
● All stainless steel construction.

● Seat tightness achieved with torque as opposed

to line pressure.

● Thoroughly tested in a variety of applications

including: clean pulp up to a consistency of 5%,
waste water and secondary effluent.

● Bypass unit cast into the bonnet prevents

clogging.

● Conventional packing chamber eliminates leakage

problems associated with standard knife valves.

● 150 psig max. working pressure.

150°F max. working temperature.
Applications outside of these conditions require
special design considerations.

PATENT NO:
5295661

DIMENSIONS AND WEIGHTS

SIZE Tap No.
in
mm
A C BD Size
in (UNC)
of
Holes
D D1 E T
6 2.25 8.50 9.50 0.75-10 8 22.25 28.34 10 0.40
150 57 216 241 565 720 254 10
8 2.75 10.62 11.75 0.75-10 8 27.37 35.75 10 0.57
200 70 270 298 695 908 254 14
10 2.75 12.75 14.25 0.88-9 12 33.50 43.68 14 0.57
250 70 324 362 851 1109 356 14
12 3.00 15.00 17.00 0.88-9 12 38.56 50.62 14 0.65
300 76 381 432 979 1286 356 16.5
14 3.00 16.25 18.75 1.00-8 12 42.43 56.00 14 0.65
350 76 413 476 1078 1422 356 16.5
16 3.50 18.50 21.25 1.00-8 16 47.63 63.00 18 0.69
400 89 470 540 1210 1600 457 17
18 3.50 21.00 22.75 1.12-7 16 53.25 70.68 18 0.83
450 89 533 578 1353 1795 457 21
20 4.50 23.00 25.00 1.12-7 20 58.87 78.37 18 0.94
500 114 584 635 1495 1991 457 24
24 4.50 27.25 29.50 1.25-7 20 68.43 91.53 20 0.94
600 114 692 749 1738 2325 508 24

8
 ALL STAINLESS STEEL BOLTED BONNET
KNIFE GATE VALVES, FULL PORT, 6–24" (150–600 mm)
FOR BIDIRECTIONAL SHUTOFF UP TO 150 PSI, FULLY LUGGED,
TYPE 320B RESILIENT SEAT

DESIGN FEATURES:
● All stainless steel construction.
● Seat tightness achieved with torque as opposed
to line pressure.
● Bidirectional shutoff from 0 to 150 psi.
● Thoroughly tested in a variety of applications
including white water and weak black liquor.
● Bypass unit cast into the bonnet prevents
clogging.
● Conventional packing chamber eliminates leakage
problems associated with standard knife valves.
● 150 psig max. working pressure.
150°F max. working temperature.
Applications outside of these conditions require
special design considerations.

PATENT NO:
5295661
For CV & seat tightness
see chart on page 3
DIMENSIONS AND WEIGHTS
SIZE Tap No. O WEIGHT
in
mm
A C BD Size
in (UNC)
of
Holes
D D1 E T Resilient
Seat
lb
kg
6 2.25 8.50 9.50 0.75-10 8 22.25 28.34 10 0.40 5.59 65
150 57 216 241 565 720 254 10 142 29.5
8 2.75 10.62 11.75 0.75-10 8 27.37 35.75 10 0.57 7.59 95
200 70 270 298 695 908 254 14 193 43.1
10 2.75 12.75 14.25 0.88-9 12 33.50 43.68 14 0.57 9.59 155
250 70 324 362 851 1109 356 14 244 70.3
12 3.00 15.00 17.00 0.88-9 12 38.56 50.62 14 0.65 11.34 190
300 76 381 432 979 1286 356 16.5 288 86.2
14 3.00 16.25 18.75 1.00-8 12 42.43 56.00 14 0.65 12.84 230
350 76 413 476 1078 1422 356 16.5 326 104.3
16 3.50 18.50 21.25 1.00-8 16 47.63 63.00 18 0.69 14.84 315
400 89 470 540 1210 1600 457 17 377 142.9
18 3.50 21.00 22.75 1.12-7 16 53.25 70.68 18 0.83 16.81 475
450 89 533 578 1353 1795 457 21 427 215.5
20 4.50 23.00 25.00 1.12-7 20 58.87 78.37 18 0.94 18.81 650
500 114 584 635 1495 1991 457 24 478 294.8
24 4.50 27.25 29.50 1.25-7 20 68.43 91.53 20 0.94 22.78 890
600 114 692 749 1738 2325 508 24 579 403.7

9
 OPTIONS
● DEFLECTION CONES
In stainless steel or other
materials are available to
divert the flow of
abrasive slurries and
protect valve seat from
abrasion.

Typical applications
include dry solids,
storage bins, bottom
valves, mining slurries,
fly ash, filters, cyclons,
etc. The cone is installed
“V” orifices between valve and pipe
flange.
● “V” ORIFICE
Flow data on page 12. Double Packing
● BONNET PURGE Deflection Lantern Ring
● OPERATION CONNECTORS Cones Live-loading and leak-off
Handwheel, quick lever, For very fine slurry lines,
purge connections are ● BODY PURGE
chain wheel, bevel gear,
recommended. Purging CONNECTIONS
on-off cylinder Stem
actuators, positioning is used to prevent For higher density protectors available
packing of material in pulp applications upon request.
cylinder actuators,
electric actuators. bonnet areas. consult factory.

ALTERNATIVE SEAT DESIGNS

➀ ➁ ➂ ➃ ➄
➀ Integral Seat ➂ Resilient Seat
● Pulp and paper ● Pulp & paper
● Chemical industry ● Chemical industry
● Food processing
● Food processing ● Petrochemical industries
● Agriculture ● Textile industry
● Petrochemical
industries ➃ Renewable Stellite 6
● Sugar industry Seat and Deflector
● Textile industry ● Tough applications in
fibers and pulp and paper
waste water ● Coal liquefaction
● Abrasive mining slurries
● Granulated ore in water
➁ Polyurethane ● Fly ash lines
Seat & Deflector ● Coal pipelines
( available on
Standard Knife ➄ Integral Stellite 6
Gate Valves only ) Hardfaced Seat with
● Waste water Special Body Designed
treatment to Match Basalt
● Water plants Pipe Flanges
( available on Bolted Bonnet
● Abrasive mining Knife Gate Valve only )
slurries ● Tough Lignite bottom
● Pipelines ash service

10
 SUPERIOR SEATING
STAINLESS STEEL SEAT RING WITH
NEW CRIMPED RESILIENT SEAT
PREVENTS ACCIDENTAL EXTRACTION
KNIFE
TWO LUGS
Old “snap-in” style seats could be too easily
extracted accidentally by friction caused by heavy RETAINER
or infrequent cycling. Velan’s new
“crimped seat” makes accidental
extraction virtually impossible.
The seat will wear normally but the
crimped design keeps it tight inside
Old style CRIMPED
seats the seat retainer ring for a longer
cycle life. SEAT

O-RING
Inside
Taper
SEAT RING

1. 2. 3.
RESILIENT SEAT MATERIAL
CRIMPING THE SEAT STEP BY STEP TYPE MAX. TEMP. USE
Black neoprene 180°F Alkaline
1. The stainless steel seat ring is manufactured
with a slight inside taper. Off-white neoprene 180°F Prevent color contamination
Viton 400°F Chemicals
2. The “O” ring is inserted.
EPDM 250°F Food grade
3. Seat ring is progressively crimped on a lathe
Teflon 400°F Food
to imprison the “O” ring in it.
Polyurethane 210°F Waste water

BOLTED BONNET KNIFE GATE VALVES

NEW BOTTOM LUG DESIGN
KNIFE NEW DESIGN
An important breakthrough in bottom lug TWO LUGS
design for Pulp and Paper applications, the
Velan Bolted Bonnet Knife Gate valve features
a bottom lug that permits longer fibers to CRIMPED
SEAT
circulate on each side preventing clogging
during closing. This improvement is currently
available on most sizes.
O-RING

SEAT RING

11
 SUPERIOR KNIFE
OUR KNIVES ARE THICKER,
STRONGER AND HAVE A
BETTER SEATING FINISH
● Thicker knife. Our valves have ● Precision-machined, bottom
thicker, stronger knives, to and top edges provide
prevent deflection under shearing action for pulp stock
heavy pressure and to ensure and slurry.
a tight seal. ● Lapped seating face for
The minimum knife thickness maximum tightness.
for Velan knife gate valves are
based on the ASME formula
for plate thickness. For specific Knife Gate Valve
See "Formula for Calculating thicknesses see tables
on page 3,4,5,8, and 9
Minimum Knife Thickness".

EASY MAINTENANCE

Easy seat maintenance due to

replaceable seat retainer ring on
standard knife gate valves from
8–36” and bolted bonnet knife For complete maintenance
gate valves from 6–24”. procedure including important
pipe flange bolt torquing
Simply grinding off the seat ring specifications, please refer to the
retainers on the valve body Knife Gate Valve Maintenance
permits extraction of the seat Manual VEL-KGVM-96
through the packing chamber.
Since Velan features a crimped
seat, the “O” ring cannot be
replaced. A new seat ring,
including a crimped in “O” ring
can easily be put back into place
and secured there by tack
welding the retainers.
This operation can be done many
times insuring that the Velan
knife gate valve gives years of
reliable service.

12
 IN-SERVICE PHOTOS

Pump discharge shutoff

5% pulp at 70 psi cycling
over 75 times a day.

Centrifugal cleaner isolation.

Pressure around 25-35 psi 2.5% pulp.

Due to unique torque closure of it’s seat,

the Velan Bolted Bonnet Knife Gate
valve is an ideal solution to low pressure
services and bidirectional applications.

Post refiner line isolation.

Filter isolation installation.

Multiple pump discharge isolation with pressure 70-90 psi white water.

13
 ACTUATORS

Gear Air or Electric

Hydraulic

GEAR ACTUATORS Handwheels and gear boxes can be mounted on top

Our standard handwheels suffice to reduce rimpull to of the cylinders for emergency operation due to loss
acceptable levels. An optional oversized handwheel of operating medium in the cylinder.
or VT-20 gear actuator can be supplied for 16" to 24" If specified by the customer, Velan valves can be
valves. furnished with mounting pads for most steel
cylinders or valve positioners for throttling control.
CYLINDER ACTUATORS
Various types of cylinders are available for operating ELECTRIC ACTUATORS
Velan knife gate valves. The most commonly-used Motorized controls may be applied to valves of any
cylinders are operated by air, but oil and water types size, for operation in practically any position or
are available if required. location. All units, whether installed directly on a
In most designs, the valve stem serves as a piston valve or on a floor stand, can be manually operated
rod, with the knife fastened directly to the actuator. in case of power failure. The units are available for
Actuators with double-ended piston rod option can either alternating or direct current and are sized for
be supplied to install position indicators or limit specified conditions of operation. Motor units are
switches and for connecting an emergency device for available with limit switches and push button
manual actuation of the valve. controls which can be selected to meet customer's
requirements.

14
 ALL STAINLESS, FABRICATED OR CAST
TYPE 33 KNIFE GATE VALVE FOR THROTTLING
3–24" (80–600 mm)
“O” OR DIAMOND PORT, FULL PORT, 150 PSIG

DESIGN FEATURES:
● Linear flow from low to full opening.

● Non-plugging bonnet and throttle orifice.

● Machined seat allows tight shutoff.

● Beveled gate provides positive shearing action.

● Port closure directly proportional to stem travel

for throttling.

● Throttles dense solutions of paper mill stock for

headbox flow control, etc.

● All interior surfaces exposed to piped liquid are

stainless steel. Full stainless gasket surfaces.

● Deep packing glands eliminate leakage.

● Simple single yoke construction eliminates outside

gearing and bearings.
"O" PORT DIAMOND PORT

Gear, pneumatic or electric

actuators available

DIMENSIONS AND WEIGHTS

SIZE
in
A
Face to Face
C
Flange
BD
Bolt Circle
D
Center to Top
Center
to Bottom E
Handwheel
DI
Center to Top
Center to
Bottom
Cv
Round
Cv
Diamond
mm Diameter Closed Closed Diameter Open Open Port Port
3 2 7.5 6 17 13.25 12 19.25 10.25
80 51 191 152 432 337 305 489 260 362 210
4 2 9 7.5 20.25 16.25 12 23.75 12
100 51 229 191 514 413 305 603 305 646 386
6 2.25 11 9.5 22.75 22.25 12 28.75 15.5
150 57 279 241 578 565 305 730 394 1,450 900
8 2.75 13.5 11.75 27.75 26.25 12 35.25 18
200 70 343 298 705 667 305 895 457 2,570 1,600
10 2.75 16 14.25 31.75 31.5 15 41.25 21
250 70 406 362 806 800 381 1048 533 3,423 2,300
12 3 19 17 36.25 37 15 48 24.25
300 76 483 432 921 940 381 1219 616 5,674 3,700
14 3 21 18.75 39 40.25 20 52.25 26.25
350 76 533 476 991 1022 508 1327 667 7,069 4,600
16 3.5 23.5 21.25 43.75 45.25 24 59 29.25
400 89 597 540 1111 1149 610 1499 743 9,365 6,150
18 3.5 25 22.75 48 50 24 65.25 32
450 89 635 578 1219 1270 610 1657 813 11,892 8,200
20 4.5 27.5 25 52.25 55 30 72.25 35
500 114 699 635 1327 1397 762 1835 889 14,922 10,050
24 4.5 32 29.5 58 65 30 81 41
600 114 813 749 1473 1651 762 2057 1041 20,550 15,000

15
 TILTING DISC CHECK VALVES
THROUGH-BOLTED FLANGES, 2 1⁄2 -24" (65-600 mm)
ASME B16.5 CLASS 150, TYPE 34

DESIGN FEATURES:
● Manufactured in corrosion-resistant
stainless steel.
● Precision machined tilting disc and
seat for tight shutoff in reverse flow
direction.
● Designed with an off-center pivot
to prevent the disc from slamming
against the seat and to aid
operation at low pressure
differentials.
● Can be installed in both the
horizontal or vertical positions,
provided fluid flow is upward.
● Rugged construction, simple and
lightweight.
● 150 psig max. working pressure.
150°F max. working temperature.
Applications outside of these
conditions require special design
considerations.
● Flanges meet ASME B16.5,
DIMENSIONS AND WEIGHTS
class 150.
SIZE
in
A C
Flange
BD No.
of
Hole
Size
Maximum
Width
● Serrated gasket faces.
Face to Face Bolt Circle Holes
mm Diameter
2.5 8.50 7.00 5.50 0.75 8.75
65 216 178 140 4 19 222
3 9.50 7.50 6.00 0.75 9.75
80 241 191 152 4 19 248 NOTE:
4 11.50 9.00 7.50 0.75 11.50 Flanges drilled
100 292 229 191 8 19 292 to match
6 14.00 11.00 9.50 0.88 13.50 ASME B16.5 class 150.
150 356 279 241 8 22 343
8 18.00 13.50 11.75 0.88 16.00
200 457 343 298 8 22 406
10 21.75 16.00 14.25 1.00 19.00
250 552 406 362 12 25 483
12 25.25 19.00 17.00 1.00 21.75
300 641 483 432 12 25 552
14 28.00 21.00 18.75 1.12 25.00
350 711 533 476 12 29 635
16 30.00 23.50 21.25 1.12 28.00
400 762 597 540 16 29 711
18 31.00 25.00 22.75 1.12 29.50
450 787 635 578 16 32 749
20 32.50 27.50 25.00 1.12 32.75
500 826 699 635 20 32 832
24 34.00 32.00 29.50 1.38 38.75
600 864 813 749 20 35 984

16
 HOW TO ORDER

TYPE OF SIZE OF PRESSURE TYPE FACE-TO-FACE BODY, KNIFE BODY SEAT

CONNECTION CONNECTION* RATING STYLE & STEM MATERIAL MATERIAL

A B C D E F G

e.g.: L 1 4 — 0 3 1 0 C — 1 3 S L
is a wafer-style 6" class 150 metal-seated cast stainless steel knife gate valve.

The figure numbers shown on this key are designed to cover F BODY, KNIFE AND STEM MATERIAL
essential features of Velan valves. Please use figure numbers
CODE BODY-SEAT RING KNIFE STEM
to ensure prompt and accurate processing of your order. 01 Special Special Special
A detailed description must accompany any special orders. 02 A105, WCB 316 410
11 F304, CF8 304 316 or 304
12 F304L, CF3 304L 316 or 304
A TYPE OF CONNECTION 13 F316, CF8M 316 316 or 304
A - Special B - Butt weld F - Flanged L - Lug (wafer) 14 F316L, CF3M 316L 316 or 304
23 Alloy 20 Alloy 20 316 orAlloy 20
28 F317, CG8M 317L 316 or 317L
B SIZE OF CONNECTION* 29 F317L, CG3M 317L 316 or 317L
Customers have the choice of specifying valve size as 35 254 SMO 254 SMO 316 or 254 SMO
part of the valve figure (“B”) using the numbers below,
or indicating valve size separately. G SEAT MATERIAL
Examples: CODE SEAT CODE SEAT
L14-0310C-13SL (valve size is part of figure number) SL Integral EP EPDM
6" L-0310C-13SL (valve size is shown separately) BL Viton MS Stellite faced
CL Black neoprene PL Polyurethane
08 - 2" 13 - 5" 18 - 12" 22 - 20" 28 - 28" 36 - 36"
CW White neoprene ST Stellite 6
09 - 2 1/2" 14 - 6" 19 - 14" 23 - 22" 30 - 30" 42 - 42" AA Special
FL Teflon
10 - 3" 15 - 8" 20 - 16" 24 - 24" 32 - 32" 48 - 48"
12 - 4" 16 - 10" 21 - 18" 26 - 26" 34 - 34" 99 - Special

C PRESSURE RATING
MATERIAL SPECIFICATIONS
0 - 150 psi A - Special
CAST
D TYPE ASTM 316 316L 304 317L
BAR STOCK PLATE
DESIGNATION A351 CF8M A351 CF3M A351 CF8 A351 CG3M 316 304 316
31 - Knife gate, metal seat
Carbon 0.08 0.03 0.08 0.08 0.08 0.08 0.08
32 - Knife gate, resilient seat
Manganese 1.50 1.50 1.50 1.50 2.00 2.00 2.00
COMPOSITION %

33 - Throttling stock
34 - Tilting disc check Phosphorus 0.04 0.04 0.04 0.04 0.045 0.04 0.045
35 - Horizontal swing check Sulphur 0.04 0.04 0.04 0.04 0.030 0.03 0.03
37 - V-port knife gate Silicon 1.50 1.50 2.00 1.50 1.00 1.00 0.75
38 - Knife gate with seat insert Nickel 9.00-12.00 9.00-13.00 8.00-11.00 11.5-13.5 10-14 8.00-10.50 10.00-14.00
99 - Special Chromium 18.00-21.00 17.00-21.00 18.0 -21.00 20.5-23.5 1 -18 18.00-20.00 16.00-18.00
Molybdenum 2.00-3.00 2.00-3.00 — 3.00-4.00 2.00-3.00 — 2.00-3.00
E FACE-TO-FACE STYLE
Heat Treatment Solution anneal
0 - TAPPI standard (wafer) Tensile ksi min. 70 70 70 75 75 75 75
1 - ASME standard (flanged) Yield ksi min. 30 30 30 35 30 30 30
2 - Regular (flanged) Elong. % min. 30 30 35 25 30 30 40
3 - Special
R. area % min. — — — 36 40 40 —
B - Bolted bonnet
Hardness HB max. — 187 — 185 187 187 217
C - Cast
F - Fabricated Parts Body, bonnet, yoke Stem, post Knife

17