FNW 61B User Manual

Figure 61B

KNIFE GATE VALVES

STAINLESS STEEL LINED

METAL SEATED KNIFE GATE VALVE

The gure 61B is a lined valve with the economy of a ductile
iron body and the corrosion resistance of all stainless steel
wetted parts. The 61B is designed for pulp and paper,
chemicals, mining and petroleum industries to handle dense
mixtures of stock and slurries. The shearing action of the
knife gate cuts through solids and cleans the seat as it closes.

Features:

• Unidirectional Shutoff

• Stainless Steel Lined Ductile Iron Body

• Thrust Ball Bearing Yoke Bushing (18” & Larger)

• Cast Iron Handwheel

• Bonnetless, Outside Screw & Yoke

• Rising Stem

• Corrosion Resistant Stainless Impregnated Coating

• Meets MSS SP-81 Specication for 150 PSI CWP

• Smooth Flow, Non-clogging Step Seat Design

• Available in sizes from 3” to 24”

Unidirectional

Metal Seated

Standards:

• Design: MSS SP-81

• Flange Drilling: ANSI B16.5

• Seat/Shell Test: MSS SP-81

Stainless Steel Lined

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Options

FNW Valve Company offers many options and
modications 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 for low ΔP or reverse operation
applications, or to prevent knife blade deection.

• V-ports for reduced plugging in metering
applications

• Stem extensions in carbon and stainless steel

• Conversion to non-rising stem (NRS)

• Deection 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 or seat pocket area

• Quick opening levers

• Gate scraper

Contact FNW for knife gate valve options.

Packing Options

Type

PTFE Impregnated Fiber (Standard) 425ºF

Pure TFE 425ºF

TFE Fiber (Ultra) 500ºF

Graphite Filament Yarn 1000ºF

Temperature

Limit

Standard Materials

Ref.

No.

1 Body Ductile Iron 1

2 Knife A240 316 1

3 Yoke A216 WCB 1

4 Stem A276 410 1

5 Body Seat Ring A240 316 1 Welding

6 Packing PTFE Impregnated Fiber 1 Set Non-Asbestos

7 Packing Gland A216 WCB 1

8-1 Gland Bolt STEEL 1 Set

8-2 Gland Nut STEEL 1 Set Nylon Lock Nut

9-1 Yoke Bolt STEEL 4

9-2 Yoke Nut STEEL 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 A338 1

14 Name Plate ALUMINUM 1

15 Lock Washer A240 304 1

16 Wheel Nut BRASS, STEEL 1

17 Bottom Stopper A240 316 2 Welding

18 Rivet ALUMINUM 2

19 Grease Nipple ASS’Y 1

20 Bearing Housing A216 WCB 1

21 Thrust Ball Bearing ASS’Y 2 18” And Larger

22 Bearing Gland A216 WCB 1 Tack Weld

23-1 Bearing Housing Bolt STEEL 4

23-2 Bearing Housing Nut STEEL 4

24 Body Liner A240 316 1 Set Welding

Description Material Qty Remarks

Torque

Size DN Torque

3 80 39

4 100 52

6 150 78

8 200 91

10 250 104

12 300 117

14 350 136

16 400 156

18 450 208

20 500 234

24 600 273

Flow Coefcients, Port Areas, & Weights

Size Cv Port Area (in²) Wt. (Lbs)

3 240 5.64 24

4 430 9.84 35

6 1,010 23.15 57

8 1,830 42.06 86

10 2,890 66.59 128

12 4,200 96.72 169

14 5,510 127.01 223

16 6,920 159.4 295

18 8,960 206.52 363

20 11,270 259.74 557

24 16,270 374.78 671