The Butt Weld (B4, B8)check valve is a one-piece body machined from bar stock, eliminating porosity concerns and providing uniform density for more consistent welds. Made to ASME/ANSI B16.25 for schedule 40 pipe (B4), or schedule 80 pipe (B8) it carries rugged, dependable Check-All trim with a wide variety of seat materials and cracking pressures to choose from. Note: Please take sufficient measures when welding to prevent heat build-up and possible damage to the valve seat.
Size & Dimension
Nominal Pipe Size
Size Code
A
B*
B4 Valve C & D
B8 Valve C & D
E
Orifice Diameter
1/2
D
2.16
15/16
0.622
0.546
0.84
0.348
3/4
F
2.71
1-3/16
0.824
0.742
1.05
0.464
1
H
2.95
1-1/2
1.049
0.957
1.32
0.593
1-1/4
I
3.64
1-7/8
1.380
1.278
1.66
0.890
1-1/2
J
3.91
2-1/4
1.610
1.500
1.90
1.135
2
K
4.36
2-3/4
2.067
1.939
2.38
1.385
2-1/2
L
5.00
3-1/4
2.469
2.323
2.88
1.555
3
M
5.44
3-3/4
3.068
2.900
3.50
2.025
4
N
6.80
4-3/4
4.026
3.826
4.50
2.560
NOTES (DIMENSIONS TABLE)*May be larger.Consult factory for more information.
Seat material and spring material selection may limit the recommended service temperature.
See seat ratings, spring ratings, and body material ratings for their respective recommended service temperatures.
Consult the factory for reduced P-T rating above 100 °F. Standard spring material is 316 Stainless Steel.
Flow Data
PRESSURE DROP PSI
Size
Cv
1/2
2.4
3/4
4.4
1
6.1
1-1/4
12.7
1-1/2
18.8
2
32.0
2-1/2
42.5
3
89.0
4
144
FOR WATER AT 72°F
WATER FLOWRATE - GPM
Note: All flow curves and Cv values presume the valves are fully open with 1/2 PSI cracking pressure springs. Consult the factory for more information.
Valve Weights
SIZE
PART NUMBER
SS, CS & Alloys
1/2
B4D
4.6 oz.
3/4
B4F
9.1 oz.
1
B4H
15.0 oz.
1-1/4
B4I
1.7 lb.
1-1/2
B4J
2.6 lb.
2
B4K
4.1 lb.
2-1/2
B4L
6.3 lb.
3
B4M
8.4 lb.
4
B4N
15.2 lb.
Valve weights are approximate.
Seat & Cracking Pressure Options
Valve Style
Size Range
Body Materials
Other Options
Allowable Seat Materials
Other Options
Standard Cracking Pressures
Other Options
More Info.
Standard Spring Material
More Info.
B4
1/2"-1-1/2"
316L SS
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
3.5 PSI
316 SS
B4
1/2" - 1-1/2"
C. Steel
AFLAS®
Buna-N
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
3.5 PSI
316 SS
B4
2" - 4"
316L SS
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS
B4
2" - 4"
C. Steel
AFLAS®
Buna-N
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS
B4
1/2" - 4"
Alloy 20
Alloy C-276
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSI
Alloy C-276
B4
1/2" - 4"
Alloy 400 or MONEL®
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSI
Alloy 400 or MONEL®
B4
1/2" - 4"
Alloy B
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
