Description

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.

Available Materials
* 316 Stainless Steel (SS) * Alloy B (HB)
* Alloy 20 (A2) * Alloy C-276 (HC)
* Carbon Steel (CS) * Alloy 400 or MONEL® (MO)

Pressure Temerature Table
Body Material Availability Non-Shock Pressure-Temperature Rating    
316/316L Stainless Steel (SS) Standard 1/2" - 1"

5000 PSIG @ 100 °F
(1500 PSIG for o-ring seats)

1-1/4" - 2-1/2"

4000 PSIG @ 100 °F
(1500 PSIG for o-ring seats)

4"

1500 psig @ 100 °F

Carbon Steel (CS)
Alloy 20 (A2) Semi-Standard
Alloy C-276 (HC)
Alloy 400 or MONEL® (MO)
Alloy B (HB) Contact the factory for these or other materials.


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®
1/2 PSI Alloy B