Bushing Valve Style - BU, BR

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Bushing Valve (BU)

The Bushing Valve (BU, BR) is a check valve with a standard bushing housing. The valve is adaptable to many types of service applications. It has very little restriction and produces a low pressure drop. It can be used quite effectively in systems where flow and pressure drop are critical by the use of a reducer coupling. The BU valve also makes an excellent vacuum breaker. The high flow rate insures maximum effectiveness for vacuum breaker service. By reversing the direction of flow it can also be used as a low pressure relief valve.

The bushing thread sizes are designated by two sets of numbers; the first being the male thread, that second the femals thread. NPT threads are per ASME B1.201. Also available with ISO 7 "R" (R male x Rp female) threads (BR)

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NOTES (DIMENSIONS TABLE)
 
The bushing thread sizes are designated by two sets of numbers; the first being the male thread, the second the female thread. Threads are per ASME B1.20.1.
*May be larger and/or round.
**Maximum nominal dimension for a fully open valve with no spring. Consult factory for more information.

View BU Dimensions in PDF format

Nominal Size Size Code A Hex Size B* C D E F** Orifice Diameter
1/2 x 3/8 D 1.30 7/8 1/4 1/2 NPT 3/8 NPT 0.53 0.348
3/4 x 1/2 F 1.30 1-1/8 1/4 3/4 NPT 1/2 NPT 0.61 0.464
1 x 3/4 H 1.83 1-3/8 1/2 1 NPT 3/4 NPT 0.78 0.593
1-1/4 x 1 I 1.83 1-3/4 1/2 1-1/4 NPT 1 NPT 0.85 0.890
1-1/2 x 1-1/4 J 2.17 2 5/8 1-1/2 NPT 1-1/4 NPT 1.01 1.135
2 x 1-1/2 K 2.17 2-1/2 5/8 2 NPT 1-1/2 NPT 1.19 1.385
2-1/2 x 2 L 2.53 3 5/8 2-1/2 NPT 2 NPT 1.43 1.555
3 x 2-1/2 M 3.09 3-1/2 1 3-NPT 2-1/2 NPT 1.59 2.025
  • 316 Stainless Steel (SS)
  • Alloy B (HB)
  • Alloy 20 (A2)
  • Alloy C-276 (HC)
  • Brass (BR)
  • Alloy 400 or MONEL® (MO)
  • Carbon Steel (CS)
  • Titanium (TI)
  • Body Material Availability Non-Shock Pressure-Temperature Rating

    316 Stainless Steel (SS)
    Carbon Steel (CS)
    Brass (BR)

    Standard 3000 psig @ 100°F

    (1500 PSIG for o-ring seats)
    Alloy 20 (A2)
    Alloy C-276 (HC)
    Alloy 400 or MONEL®(MO)
    Semi-standard
    Alloy B (HB)
    Titanium (TI)
    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 x 3/8 2.6
    3/4 x 1/2 4.6
    1 x 3/4 6.6
    1-1/4 x 1 12.6
    1-1/2 x 1-1/4 18.8
    2 x 1-1/2 32.0
    2-1/2 x 2 42.5
    3 x 2-1/2 89.0

    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 ALL MATERIALS
    1/2 x 3/8 BUD 1.7 oz.
    3/4 x 1/2 BUF 2.9 oz.
    1 x 3/4 BUH 6.4 oz.
    1-1/4 x 1 BUI 10.8 oz.
    1-1/2 x 1-1/4 BUJ 13.8 oz.
    2 x 1-1/2 BUK 1.6 lb.
    2-1/2 x 2 BUL 2.3 lb.
    3 x 2-1/2 BUM 5.4 lb.
    *BU size is designated by the male thread.
    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.
    BU 1/2" - 1-1/2" 316 SS
    Brass
    AFLAS®
    EPDM
    "Metal to Metal"
    PTFE
    Buna-N
    Kalrez®
    Neoprene
    Viton®
    1/8 PSI
    1/2 PSI
    1.5 PSI
    3.5 PSI
    316 SS
    BU 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
    BU  2"-3" 316SS
    Brass
    AFLAS®
    Buna-N
    EPDM
    Kalrez®
    "Metal to Metal"
    Neoprene
    PTFE
    Viton® 
    1/8 PSI
    1/2 PSI
    1.5 PSI
    316 SS
    BU 2"-3" C. Steel AFLAS®
    Buna-N
    Kalrez®
    "Metal to Metal"
    Neoprene
    PTFE
    Viton®
    1/8 PSI
    1/2 PSI
    1.5 PSI
    316 SS
    BU  1/2"-3" Alloy 20
    Alloy C-276
    AFLAS®
    Buna-N
    EPDM
    Kalrez®
    "Metal to Metal"
    Neoprene
    PTFE
    Viton®
    1/2 PSI Alloy C-276
    BU 1/2"-3" Alloy 400 or MONEL® AFLAS®
    Buna-N
    EPDM
    Kalrez®
    "Metal to Metal"
    Neoprene
    PTFE
    Viton®
    1/2 PSI Alloy 400 or MONEL®
    BU  1/2"-3" Alloy B AFLAS®
    Buna-N
    EPDM
    Kalrez®
    "Metal to Metal"
    Neoprene
    PTFE
    Viton® 
    1/2 PSI Alloy B

    Note:  The bushing thread sizes are designated by two sets of numbers; the first being the male thread, the second the female thread.

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