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Figure 68B
KNIFE GATE VALVES
STAINLESS STEEL RESILIENT SEATED
KNIFE GATE VALVE
The gure 68B is a stainless steel body and yoke design.
The 68B is designed to handle light mixtures of stock and
slurries with bidirectional positive shut-off.
Features:
• Bidirectional Shutoff
• Zero Pressure Differential Needed for Shutoff
• Mechanically Retained Resilient Seat
• Wire Reinforced Seat Material
• Cast Stainless Steel Body, Yoke and Packing Gland
• Thrust Ball Bearing Yoke Bushing (14” & Larger)
• Ductile Iron Handwheel
• Bonnetless, Outside Screw & Yoke
• Rising Stem
• Meets MSS SP-81 Specication for 150 PSI CWP
• Smooth Flow, Non-clogging Step Seat Design
• Available in sizes from 3” to 30”
Bidirectional
Resilient Seated
Standards:
• Design: MSS SP-81
• Flange Drilling: ANSI B16.5
• Shell Test: MSS SP-81
• Seat Test: Exceeds MSS SP-81
Positive Shutoff Seat
www.fnw.com
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Options
FNW Valve Company offers many options and
modications for valves. These include, but are
not limited to:
• Actuation including ratchets, chain wheels,
AWWA nuts, gear-operators, pneumatic &
hydraulic cylinders, and electric actuators
• Packing options for pH and temperature
requirements
• Back seat stops to prevent knife blade deection
• V-ports for reduced plugging in metering
applications
• Stem extensions in carbon and stainless steel
• Conversion to non-rising stem (NRS)
• Deection cones in Ni-Hard and HDPE for added
seat and gate protection in abrasive services
• Flush ports to clear suspended matter from the
valve chest
• Quick opening levers
• Various seat materials
• Open and close position lockout lugs
Contact FNW for knife gate valve options.
Standard Materials
Ref.
No.
1 Body A351 CF8M 1
2 Disc A240 316 1
3 Yoke A351 CF8 1
4 Stem A276 304 1
5 Resilient Seat BUNA
6 Packing PTFE/FIBER 1 Set Non-Asbestos
7 Packing Gland A351 CF8 1
8-1 Gland Bolt A193 B8 1 Set
8-2 Gland Nut A194 8 1 Set Nylon Lock Nut
9-1 Yoke Bolt A193 B8 4
9-2 Yoke Nut A194 8 4
10-1 Clevis Bolt A193 B8 2
10-2 Clevis Nut A194 8 2 Nylon Lock Nut
11 Yoke Sleeve BRASS 1
12 Thrust Washer BRASS 1
13 Hand Wheel DUCTILE IRON 1
14 Name Plate ALUMINUM 1
15 Lock Washer A240 304 1
16 Wheel Nut STEEL 1
17 Seat Wire A276 304 1
18 Rivet ALUMINUM 2
19 Grease Nipple ASS’Y 1
20 Bearing Housing A351 CF8 1 14" & Larger
21 Thrust Ball Bearing ASS’Y 2 14" & Larger
22 Bearing Gland A351 CF8 1 Tack Weld
23-1 Bearing Housing Bolt A193 B8 4 14" & Larger
23-2 Bearing Housing Nut A194 8 4 14" & Larger
24 Lock Cap A276-304 1
25 Lock Cap Nut A194-8 1 Nylon Lock Nut
Description Material Qty Remarks
Packing Options
Type
PTFE Impregnated Fiber (Standard) 425ºF
Pure TFE 425ºF
TFE Fiber (Ultra) 500ºF
Graphite Filament Yarn 1000ºF
Temperature
Limit
Flow Coefcients, Port Areas, & Weights
Size Cv Port Area (in²) Wt. (Lbs)
3 290 6.65 26
4 530 12.19 37
6 1,160 26.68 51
8 2,110 48.62 77
10 3,300 76.01 123
12 4,820 110.98 170
14 6,100 140.74 234
16 8,200 188.84 348
18 10,220 235.49 415
20 12,680 292.10 600
24 18,380 423.61 781
30 28,920 666.12 1480