Butt Weld Style - B4, B8

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Butt Weld Style - B4, B8

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.

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NOTES (DIMENSIONS TABLE)
*May be larger.
Consult factory for more information.

View B4 Dimensions in PDF format

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

    3"

    3000 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.

    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

    P
    R
    E
    S
    S
    U
    R
    E

    D
    R
    O
    P

    P
    S
    I

    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.

    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.
    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

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