FNW 6500 User Manual

Figure 6500

KNIFE GATE VALVES

STAINLESS STEEL UNIDIRECTIONAL

METAL SEATED KNIFE GATE VALVE

The  gure 6500 is an all cast stainless steel body and yoke with
investment cast packing follower. It is designed for the pulp and
paper, chemical, mining, power, petroleum, and food process
industries, as well as municipal water and waste treatment plants.
It is ideal for handling dense mixtures of stock and slurries with
unidirectional shut-off. The shearing action of the knife gate cuts
through solids and cleans the seat as it closes.

Features

• Unidirectional Shutoff

• Maximum Pressure: 150 PSI CWP

• Maximum Temperature: 248°F (120°C)

• Cast Stainless Steel Body, Yoke, and Packing Gland

• Stainless Steel Hardware

• Gate Edge Radius (Improves Packing Seal)

• Elastomer Quad Seal is Standard in Packing Arrangement

• Resilient Anti-Extrusion Ring (Supports Packing & Acts as Gate

Wiper)

• Machined Gland Pocket Area

• Bonnetless, Outside Screw & Yoke

• Rising Stem

• Smooth Flow, Non-Clogging Step Seat Design

• Cast Iron Hand Wheel

• Available in sizes 2” to 24”

• Standard design accommodates locking device

Standards

• Design: MSS SP-81

• Flange Drilling: ANSI B16.5

• Seat/Shell Test: MSS SP-81

• Material: ASME B16.34

Figure Number Matrix

FNW 6500 Seat Size

SEAT CODE

Stainless Steel = S

(Integral)

Cv & Weight

Size Cv Wt (Lbs)

2 240 20

2-1/2 565 24

3 565 29
4 1,040 31
6 2,440 51
8 4,460 75

10 6,250 128

SIZE CODE

2 = K
2-1/2 = L
3 = M
4 = P
6 = U

8 = X
10 = 10
12 = 12
14 = 14
16 = 16

Size Cv Wt (Lbs)

12 9,400 163
14 12,500 243
16 16,500 309
18 21,400 386
20 27,000 463
24 39,700 540

Weights are for general reference only.

18 = 18
20 = 20
24 = 24

www.fnw.com

Hand wheel is heavy cast iron, with a rounded grip
and epoxy coated hand wheel.

Double set screws prevent threaded-on hand
wheel from backing off or coming loose.

Aluminum-Bronze thrust components for anti­galling operation.

Grease  tting for maintaining smooth drive sleeve
operation.

Cast stainless steel yoke arms provide optimum
fl exural rigidity.

Stainless steel hardware is standard.

Radius gate edge improves packing seal and
life. Along with the rounded packing chamber, the
system reduces the amount of force needed to
arrest packing leaks.

FEATURES

Stem-to-gate clevis is deliberately loose to allow
play in gate to minimize binding.

Horizontal clevis bolts (except 2”) provide fl exibility
of the gate during travel.

Multiple layers of PTFE impregnated square braid
packing provides excellent gland sealing at full
valve pressure differential.

Elastomer quad seal improves packing
performance by promoting live loading of the
packing.

Reinforced anti-extrusion ring enhances packing
functionality, reduces friction, acts as a gate wiper,
and supports the gate in horizontally mounted
valves.

The single piece cast all stainless steel body is
rugged and compact. It offers better leak tightness
than fabricated or two-piece designs.

The gate is high-quality, ground- nished stainless
steel. A generous gate thickness, well supported
by the packing, resists distortion or defl ection and
is less likely to bend in severe conditions.

Gate wedges located in the body aid the  nal gate/
seat sealing with a non-sliding motion.

A stepped seating design keeps the upstream
area clear. There is no dead pocket space in the
bottom of the body where suspeded solids/media
can collect.

Radius Gate Edge Packing Confi guration

The  gure 6500 utilizes three features for
an improved packing seal system.

1. PTFE/Fiber Packing

2. EPDM Quad Seal

The radius gate edge eliminates
corners that can kink or cut packing.

A radius gate edge and curved packing chamber are standard on the
 gure 6500 knife gate valve. The curved con guration:

• Improves sealing by eliminating sharp corners

• Improves packing life

• Eliminates sharp corners where corrosion and/or erosion can occur

• Requires less compression, thus reducing gate friction

• Reduced gate friction means less thrust and torque needed for

operation

Standard Materials

3. Glass Filled PTFE Anti-Extrusion Ring

In addition to the curved packing chamber, the  gure 6500 knife gate
valve standard packing con guration includes:

• Multi-layered square braid PTFE impregnated  ber which provides
excellent gland sealing at full valve pressure

• A center located EPDM “quad” seal which provides multiple sealing
contact points and semi-energized live loading of the packing

• An anti-extrusion ring enhances packing support, acts as a gate wiper,
and helps center the gate

Ref.

Description Material Qty

No.

1 Body

1A

Seat

(Integral)

2 Gate

3 Packing PTFE Impregnated Fiber

Stainless Steel, ASTM A351 Gr.

CF8M

Stainless Steel, ASTM A351 Gr.

CF8M

Stainless Steel, ASTM A240 Type

316

1

1

1

2 (2”~18”)

3 (20” & 24”)

4 Quad Seal EPDM 1

Anti

5

Extrusion

Glass Filled PTFE 1

Ring

6 Gland

7 Gland Bolt

8 Gland Nut

9 Yoke Arm

10 Yoke Bolt

11 Stem

12 Clevis Bolt

13 Clevis Nut

14 Collar

15 Collar Bolt

16 Collar Nut

Stainless Steel, ASTM A351

Gr.CF8

Stainless Steel 304,

ASTM A193 Gr. B8

Stainless Steel 304,

ASTM A194 Gr. 8

Stainless Steel, ASTM A351

Gr.CF8

Stainless Steel 304, ASTM A193

Gr. B8

Stainless Steel, ASTM A276 Type

304

Stainless Steel 304,

ASTM A193 Gr. B8

Stainless Steel 304,

ASTM A194 Gr. 8

Stainless Steel, ASTM A351

Gr.CF8

Stainless Steel 304,

ASTM A193 Gr. B8

Stainless Steel 304,

ASTM A194 Gr. 8

1

2~10

2~10

2

4

1

1 (2”)

2 (2-1/2”~24”)

1 (2”)

2 (2-1/2”~24”)

1

2 (2”~8”)

4 (10”~24”)

2 (2”~8” only)

17 Hand Wheel Cast Iron, ASTM A126 Gr. B 1

18 Yoke Sleeve

Thrust

19

Washer

Aluminum Bronze,

ASTM B148, UNS C95200

Aluminum Bronze,

ASTM B150, UNS C62300

1

1

20 Set Screws Stainless Steel, 304SS 2

Figure 6500

KNIFE GATE VALVES

STAINLESS STEEL UNIDIRECTIONAL

METAL SEATED KNIFE GATE VALVE

Dimensions (inches)

Size A B C D E F G H J K N S

2 1.88 4.75 3.62 12.99 14.17 7.99 2 5/8” 0.31 2 2.00 0.47

2-1/2 2.00 5.50 4.65 15.55 17.72 7.99 2 5/8” 0.37 2 2.95 0.47

3 2.00 6.00 5.00 15.55 17.72 7.99 2 5/8” 0.37 2 2.95 0.47
4 2.00 7.50 6.18 17.52 20.67 7.99 2 5/8” 0.37 6 4.00 0.47
6 2.25 9.50 8.50 20.87 25.98 10.00 2 3/4” 0.43 6 6.00 0.57

8 2.75 11.75 10.63 25.00 31.89 12.01 2 3/4” 0.43 6 8.00 0.57
10 2.75 14.25 12.76 27.56 37.40 15.98 4 7/8” 0.43 8 9.37 0.69
12 3.00 17.00 14.76 30.51 42.72 15.98 4 7/8” 0.43 8 11.42 0.69
14 3.00 18.75 16.26 32.68 47.05 20.00 4 1” 0.51 8 12.76 0.75
16 3.50 21.25 18.50 36.81 52.17 20.00 6 1” 0.67 10 14.57 0.87
18 3.50 22.75 21.00 41.34 59.25 20.00 6 1-1/8” 0.67 10 16.93 0.94
20 4.50 25.00 22.99 46.06 65.35 20.00 8 1-1/8” 0.91 12 18.50 0.98
24 4.50 29.50 27.24 53.54 77.17 20.00 8 1-1/4” 0.91 12 22.64 0.98

DOC: FNW650013 Ver. 8/2014

© 2014 - FNW. All rights reserved. 22038
The FNW logo is a trademark of Ferguson Enterprises, Inc., PL Sourcing, PO Box 2778, Newport News, VA 23609

The contents of this publication are presented for information purposes only, and while effort has been made to ensure their accuracy, they are not to be construed as
warranties or guarantees, expressed or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and
conditions, which are available on request. We reserve the right to modify or improve the designs or specications of our products at any time without notice. Always
verify that you have the most recent product specications or other documentation prior to the installation of these products.