FNW G731 Service manual

Figure G731
GEAR OPERATOR

Quarter-Turn Worm Gear Operator

The G731 gear-operator is
designed for use on FNW resilient
seated butterfly valves. The ISO
pads match the FNW valves per
size for direct mount. The ISO
standard configuration also allows
mounting the G731 to other valve
manufacturers using the same
dimensions.

Features:

• ISO 5211 Mounting Pad

Configuration

• Adjustable Open & Close Stops

• Ductile Iron Gear

• Nickel Plated Shaft

ISO Mounts and Ratios Per FNW Resilient Seated Butterfly Valve Sizes

Valve Size 2 2-1/2 3 4 6 8 10 12 14 16 18 20 24
ISO Code F07 F07 F07 F07 F07 F07 F10 F10 F10 F14 F14 F16 F16
Gear Ratio 24:1 24:1 24:1 24:1 24:1 30:1 30:1 50:1 50:1 50:1 50:1 80:1 80:1

Figure Number Matrix

F N W G 7 3 1 Size

SIZE CODES

2 = K 12 = 12
2-1/2 = L 14 = 14
3 = M 16 = 16
4 = P 18 = 18

For other valve materials or
configurations, contact FNW
Valve at [phone] for
sales assistance.

6 = U 20 = 20
8 = X 24 = 24
10 = 10

REF.NO. DESCRIPTION MATERIAL QTY REMARKS

1 Case ASTM A126 Cl. B 1
2 Gear ASTM A536 65-45-12 1 Not Shown
3 Worm Steel 1 Not Shown
4 Shaft Steel 1 Nickel Plated
5 Cover ASTM A126 Cl. B 1
6 Shaft Pin Steel 1 Not Shown
7 Cover Screw Steel 4

8 Stop Screw Steel (2 per stop) 4 Not Shown
10 Hand Wheel ASTM A126 Cl. B 1
11 Cover Gasket Fiber Paper 1
12 Gear Top O-ring Rubber 1
13 Hand Wheel Pin Steel 1

Standard Materials

4120 NE Columbia Blvd. - Portland, Oregon USA 97211

Phone: [phone] - Fax: [phone] - www.fnwvalve.com

Figure G731

GEAR OPERATOR

Quarter-Turn Worm Gear Operator

2" - 12"

DETAIL "A"

ASSOCIATED VALVE STEM DETAIL

(FNW 7xx-Series Resilient seat BFVs)

14" - 24"

Dimensions (Inches)

VALVE

SIZE

2-1/2 24:1 8.74 2.83 2.13 1.77 1.10 6.85 5.79 4-M8 2.76 - - 0.60 0.43 0.55 -

RATIO A G C D E K Ø n-h PCD B W H F ØC H1

2 24:1 8.74 2.83 2.13 1.77 1.10 6.85 5.79 4-M8 2.76 - - 0.60 0.43 0.55 -

3 24:1 8.74 2.83 2.13 1.77 1.10 6.85 5.79 4-M8 2.76 - - 0.60 0.55 0.63 ­4 24:1 8.74 2.83 2.13 1.77 1.10 6.85 5.79 4-M8 2.76 - - 0.70 0.55 0.63 ­6 24:1 8.74 2.83 2.13 1.77 1.10 6.85 5.79 4-M8 2.76 - - 0.75 0.67 0.87 -

8 30:1 10.51 3.31 2.99 2.60 1.34 11.50 11.81 4-M8 2.76 - - 0.81 0.67 0.87 ­10 30:1 10.51 3.31 2.99 2.60 1.34 11.50 11.81 4-M10 4.02 - - 0.81 0.87 1.10 ­12 50:1 10.51 3.31 2.99 2.60 1.34 11.50 11.81 4-M10 4.02 - - 0.95 0.87 1.10 ­14 50:1 13.62 3.49 3.09 3.05 1.54 12.15 11.81 4-M10 4.02 0.20 0.39 2.76 - 1.10 2.36
16 50:1 13.62 3.49 3.09 3.05 1.54 12.15 11.81 4-M16 5.51 0.20 0.39 2.95 - 1.26 2.36
18 50:1 13.62 3.49 3.09 3.05 1.54 12.15 15.55 4-M16 5.51 0.20 0.47 2.95 - 1.50 2.36
20 80:1 17.32 4.33 5.12 5.31 1.57 18.31 15.55 4-M20 6.50 0.20 0.47 3.54 - 1.77 2.76
24 80:1 17.32 4.33 5.12 5.31 1.57 18.31 15.55 4-M20 6.50 0.20 0.55 3.74 - 2.17 2.76

DOC: FNWG73106 Ver. 1/06

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