Wey Knife Gate Valve Models NA, A1 & W1
Full Flange Knife Gate Valve
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Wey Knife Gate Valve Models NA, A1 & W1
The Wey Knife Gate Valve Models NA, A1 and W1 combine rugged construction with time tested design refinements found in no other
knife gate valve. If you are plagued with knife gate failures, try a precision-built Wey Knife Gate Valve. You’ll wish all your knife gate
valves were Wey Knife Gate Valves.
Resilient Transverse Seal
Various elastomeric and
polymetric seal materials.
Includes compression
loaded scraper blades to
wipe gate clean and protect
seal. Repackable in service
and under pressure/vacuum.
Features
n Unique transverse seal eliminates stuffing box
and permits repacking under full pressure and
without system shutdown. Available in a variety
of special scraper and seal configurations for
tough applications.
n Unique mechanically retained resilient seal with
metal backup seat for bi-directional bubbletight shut-off.
n Unique bi-directional design. Gate is guided
and supported for smooth full pressure
differential operation throughout entire stroke
with flow in both directions.
n Unique contoured hydrodynamic interior body
design promotes flushing to prevent buildup of
deposits in seating area.
n Unique solid steel or stainless steel topworks
provide maximum strength to prevent damage
due to operator abuse or vibrating conditions.
n Unique non-rising stem design saves space
and reduces stem nut repair problems.
ISO 9001-2008/PED-Annex III (Mod H)
Section of transverse seal
illustrating how sealing
compound is inserted into
seal chamber to repack
valve while valve is in
service.
See live demonstration
Section view - bottom of
valve. Mechanically retained
resilient seal insures bubbletight shut-off with pressure
on either side of gate. Seal
will not pull out of specially
machined groove.
Section view - sides of valve.
Gate is guided in machined
groove with large diameter
seal mechanically retained to
seal gate edge. This design
provides dual metal/resilient
seating and gate support
with pressure from either
side of gate.
Contoured seat flushes out
solids which are pushed
ahead of the gate in the seat
groove while closing.
Models
Model NA Standard face-to-face with threaded flange bolt holes. (Drill-thru flange bolt holes optional.)
Model A1 Wider face-to-face with threaded flange bolt holes for back-flange bolt nut connection. (Threaded flange bolt holes optional.)
Model W1 Model W1 body style conforms to MSS SP-135 face-to-face. Specify drill-thru or threaded flange bolt holes.
ANSI 150 flange bolt hole size and pattern. Wider face-to-face permits pipe flange connection with bolt nuts
tightened against back faces of valve body flanges suitable for dead-end service with either pipe flange removed.
Body Styles
Model NA
Per illustration, valve body has TAPPI, MSS-SP81 face-to-face
with threaded flange bolt holes. Pipe flanges attach to valve
with machine bolts from both sides without the use of bolt nuts,
suitable for dead-end service. Optional drill-thru flange body style
(not illustrated) permits use of long bolts which pass through
both pipe flanges and valve flanges with bolt nuts to secure
flanges and valve assembly together, but not suitable for deadend service.
Model A1
Per illustration, Model A1 body style is slightly wider face-to-face
with drill-thru flange bolt holes. Wider face-to-face permits pipe
flange connection with bolt nuts tightened against back faces of
valve body flanges suitable for dead-end service with either pipe
flange removed. Optional threaded valve flange bolt holes (not
illustrated) also available.
Model W1
Per illustration, Model W1 body style conforms to MMS SP-135
face-to-face. Specify drill-thru or threaded bolt holes. ANSI 150
flange bolt hole size and pattern. Wider face-to-face permits pipe
flange connection with bolt nuts tightened against back faces of
valve body flange suitable for dead-end service with either pipe
flange removed.
MODEL NA
MODEL A1
MODEL W1
Mechanically retained resilient seat with wear ring and overlay option
Gate
Chrome Carbide
Overlay
Chrome Carbide
or Urethane Liner
Hardened Wear Ring
HVAF
HVAF
Elastomer Seat
(mechanically
retained)
Body
Section view
Mechanically retained resilient seal insures bubble-tight shutoff with pressure on either side of gate. Seal will not pull out of
specially machined groove.
Wear Ring Options
n Ni-hard
n Tool Steel
n Ceramic
Pipe I.D. Lining
n Chrome Carbide
n Tungsten Carbide
n Urethane
Actuator Options
Accessories
Handwheel
Chainwheel
Square drive nut
Manual bevel gear
Pneumatic cylinder
Hydraulic cylinder
Electric actuator
SolenoidLock-out
Mechanical limit switches Position indication scale
Proximity switches
OSHA yoke guard
Wear ring
Scale cutter
Pneumatic positioner
Powder-Pac option
Electronic positioner
V-Port insert
Note: Consult factory for details
Sizes and Dimensions
Note: Standard cylinders are shown. (Other sizes are available)
O = Depth of blind tapped holes in chest area of valve
P = Number of blind tapped holes in chest area per valve
For optional cylinder sizes and dimensions consult the factory.
B = Model NA face-to-face (per TAPPI/MSS-SP-81)
B1 = Model A1 (Special wide face-to-face)
B2 = Model W1 face-to-face (per MSS-SP-135)
K = Cylinder port size 4”-12” Typ. SISTAG Cyl.
N = Cylinder diameter not actual outside dimension
Handwheel
Valve
Size
2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
30"
36"
Note:
Bevel Gears (3:1) are recommended for 6”-10” valves
Bevel Gears (4:1) are recommended for 12”-24” valves
Bevel Gears (6:1) are recommended for 30” and larger valves
Consult factory for special applications
Bevel Gear
Pneumatic Cylinder
Dimensions
A
1.97
3.15
3.94
5.90
7.84
9.87
11.81
13.78
15.75
17.72
19.68
23.62
29.52
35.43
B
1.87
2.00
2.00
2.25
2.75
2.75
3.00
3.00
3.50
3.50
4.50
4.50
4.62
4.62
B1
–
–
–
–
–
–
–
–
–
–
–
–
8.26
9.84
B2
2.75
4.00
4.12
2.50
2.88
3.12
3.25
3.62
3.75
4.12
4.50
5.00
8.26
9.84
C
4.75
6.00
7.50
9.50
11.75
14.25
17.00
18.75
21.25
22.75
25.00
29.50
36.00
42.75
D
6.00
7.50
9.00
11.00
13.50
16.00
19.00
21.00
23.50
25.00
27.50
32.00
38.70
46.00
E
5/8"
5/8"
5/8"
3/4"
3/4"
7/8"
7/8"
1.00"
1.00"
1-1/8"
1-1/8"
1-1/4"
1-1/4"
1-1/2"
F
10.77
13.70
15.35
19.33
22.72
25.70
30.81
34.90
39.34
42.75
45.87
56.20
–
–
G
6.30
7.87
7.87
11.81
11.81
11.81
15.75
15.75
15.75
19.68
19.68
24.75
–
–
H
–
–
–
18.15
21.29
24.84
28.93
33.98
35.74
40.75
44.66
53.75
63.77
84.50
J
–
–
–
11.50
11.50
12.50
14.75
14.75
14.75
14.75
16.75
23.50
24.50
24.50
KNPT
1/4"
1/4"
1/4"
1/4"
1/4"
1/4"
3/8"
3/8"
3/8"
3/8"
3/4"
3/4"
3/4"
3/4"
L
–
–
–
12
12
16
16
18
18
18
24
24
30
30
M
20.25
25.25
27.00
28.89
33.57
38.90
44.21
54.25
61.50
67.50
74.25
86.25
97.50
111.50
N
4"
4"
4"
6"
8"
10"
12"
12"
14"
14"
16"
18"
20"
24"
O
–
–
0.50
0.56
0.62
0.69
0.78
0.59
0.78
0.76
1.26
1.12
1.73
1.77
P
–
–
4
4
4
8
8
8
12
12
20
20
24
20
Consult factory for valve size 42”-80” dimensions.
NA Model Valve and W1 (conforms to TAPPI and MSS SP81 Face-to-Face standard.)
Optional A1 Model Valve Face-to-Face
Important note: All dimensions subject to change. Consult factory for certified dimensions.
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