FNW 752 User Manual

Figure 752

BUTTERFLY VALVES

LARGE DIAMETER U-BODY

RESILIENT SEATED BUTTERFLY VALVE

Features:

• Maximum Working Pressure of 150 PSI

• Compatible with ANSI 125/150 Flanges

• Bi-Directional Bubble Tight Shut-Off

• Cartridge Seat Design

• High Strength Stainless Steel Taper Pins
Securing Disc to Stem

• Primary & Secondary Seals (Interference
Fit of Disc to Seat and Stem Through
Seat)

• Available with Ductile Iron (Nickel Plated)
or Cast Stainless Steel Discs*

• Available with EPDM or NBR (Buna)
Seat Material

• Two-Stage Gear Operator Standard

• Dead-End Service Capable to 100 PSI**

Standards:

• Flange Design: ANSI B16.1

• Face to Face Dimension: MSS SP-67

• Pressure Tested to:

• Seat: 165 PSI

• Shell: 225 PSI

Options

FNW offers many options and

modications for valves. These include,

but are not limited to: Actuation including

chain wheels, square drive nuts, and

pneumatic and electric operators. Also

available are various control accessories,
stem extensions, and custom mounting
hardware. Contact FNW with your specic

application needs.

Other materials and congurations are available by

*

special order. Contact FNW for further assistance.

Dead-end service capability is limited to the valve in

**

the closed position only. Opening the valve without
a downstream ange can cause the seat to shift.

www.fnw.com

Standard Materials

Ref. No. Description

1 Gear Operator Case, A126 Cl. B, Gear, ASTM A536 65-45-12 1
2 Bottom Plate Ductile Iron, ASTM A536 65-45-12 1
3 Bottom Plate Screw Steel, ASTM A283D A36 4
4 Bottom Plate O-ring Rubber, ASTM D2000 NBR 1
5 Gasket Steel 1
6 Bearing Bronze ASTM B584 C83600 1
7 Lower Bushing Bronze ASTM B584 C83600 1
8 Body Ductile Iron, ASTM A536 65-45-12 1

9 Seat Rubber, ASTM D2000 EPDM or NBR 1
10 Lower Shaft Stainless, ASTM A582 S41600 Stainless, ASTM A276 S31600 1
11 Disc Ductile Iron, ASTM A536 65-45-12 (Nickel Plated) Stainless, ASTM A351 CF8M 1
12 Taper Pin Stainless, ASTM A564 S17400 3
13 Upper Shaft Stainless, ASTM A582 S41600 Stainless, ASTM A276 S31600 1
14 Long Bushing ASTM A584 C83600 1
15 Name Plate Aluminum 1
16 Short Bushing Bronze ASTM B584 C83600 4
17 O-ring Rubber, ASTM D2000 EPDM 3
18 Key Steel 2

Ductile Iron Disc Stainless Steel Disc

Material

Qty

Seat Temperatures

Seat

Material

EPDM

Buna-N

Working

Temperature

-22° to 230°F

(-30°C to 110°C)

-4° to 194°F

(-20°C to 90°C)

Weights

Size Weight (Lbs)

28 1,272
30 1,279
32 1,715
36 1,984

40 2,712
42 2,923
48 3,505

SEAT DISC MATERIAL STEM MATERIAL OPERATOR SIZE CODE

EB==EPDM

Buna-NDS==

Other materials and operators are available on a price-on-availability
basis. Contact FNW for additional assistance.

Torque

Size Torque (in-lbs)

28 28,958
30 33,336
32 38,124
36 46,528

40 78,993
42 79,864
48 111,112

1. When sizing actuators,
application specic multipliers
should be considered.

2. High pressure differentials
should take dynamic torque

into consideration.

Figure Number Matrix

F N W 7 5 2 E D S G 30

Ductile Iron
Stainless
Steel

S = 416SS w/DI Disc

316SS w/SS Disc

G = Gear Operator

(STANDARD)

Cv (Flow Coefcients)

The size of buttery valve used for control purposes should be

calculated on the basis of the operating characteristics. In order to

achieve optimum control, the ow coefcient (Cv) of a valve needs to

be considered. Cv is the volume of water in U.S. gallons per minute
that passes through the valve at a pressure drop of 1 PSI at 68°F.
Flow for a given Cv is typically calculated from the following formula.

Q = Cv x

Where:

Q

= Valve ow rate in gallons per minute (US GPM)

∆P

= Pounds per square inch (PSI) pressure drop across valve

62.4

= Conversion factor for uids computed in relation to water

D

= Density of uids in pounds per cubic foot

∆P x 62.4

D

28
30
32
36

40
42
48

Size

28 30 1,663 3,522 7,630 12,599 20,036 30,482 46,899 58,696

30 35 1,912 4,050 8,142 13,152 20,411 31,226 47,562 63,328

32 45 2,387 4,791 8,736 13,788 20,613 31,395 48,117 68,250

36 60 3,021 6,063 11,055 17,449 26,086 39,731 60,895 86,375

40 84 4,183 8,395 15,307 24,159 36,166 55,084 84,425 119,750

42 93 4,601 9,235 16,838 26,575 39,783 60,592 92,868 131,725

48 121 5,981 12,001 21,890 34,548 51,718 78,770 120,728 171,243

10° 20° 30° 40° 50° 60° 70° 80° 90°

Cv by Disc Degrees Open