851A

Specifications:

  • Sizes –2", 2-1/2", 3", 4", 6", 8", 10", 12", 14", 16", 18", 20", 24"
  • Ductile iron body and cover
  • Epoxy coated interior & exterior for corrosion resistance
  • Certified to ANSI/NSF 61
  • Stainless steel bolts
  • Buna encapsulated steel flexible disc with nylon fabric reinforcement
  • Vertical or horizontal (flow upwards) installation
  • 250 psig (1725 kPa/17 barg) maximum working pressure, 500 psig (3450 kPa/35 barg) test pressure
  • Optional EPDM disc

Full Line Catalog

Valve Size*

A

B

C

D

2"

8.00

2.00

3.38

8.38

2-1/2"

8.50

2.50

3.38

8.38

3"

9.50

3.00

3.88

9.00

4"

11.50

4.00

4.63

9.63

5"

13.75

5.00

5.13

10.25

6"

15.00

6.00

5.88

11.00

8"

19.50

8.00

7.63

13.75

10"

24.50

10.00

9.88

16.00

12"

27.50

12.00

11.38

18.50

14"

31.00

14.00

13.38

20.50

16"

32.00

16.00

15.38

23.50

18"

36.00

18.00

17.13

25.25

20"

40.00

20.00

19.13

29.25

24"

18.00

24.00

22.75

32.75

*Nominal
**All dimensions are in inches. All weights are in pounds and are approximate.
▼ Material strength ASTM A536 65-45 minimum

Valve Size*

Weight**

2"

22

2-1/2"

30

3"

40

4"

71

5"

120

6"

125

8"

222

10"

372

12"

514

14"

696

16"

987

18"

1,340

20"

1,670

24"

2,147

Part Number

Description

Material

Material Standard

1

Body

Ductile Iron

ASTM A536 ▼

2

Bonnet

Ductile Iron

ASTM A536 ▼

3

Gasket

Rubber

ASTM D2000 BK 807

4

Disc

Steel/Buna or EPDM

ASTM A36/D2000

5

Bonnet Bolts

Steel

SAE Grade 5

6

Interior Lining

Epoxy

-

7

Plug

Ductile Iron

ASTM A536 ▼