Rupture Disk
The original rupture disk (bursting disc) manufacturer shaping the growth of pressure relief devices for over 80 years.

MB & MBV
Monoblock Graphite Disks

Graphite disks especially suited for low pressure applications.

  • One-piece assembly and attached gaskets simplify installation and reduce down-time
  • Available sizes range from 0.5 to 24 inches (15 mm to 600mm)
  • Available temperatures range to 400 degrees Fahrenheit (205 degrees Celsius)

MonoBloc disks fit most applications where a graphite disk is needed.

When using a MonoBloc disk in application:

  • Vacuum supports are needed for disks rated below 22 psig (1.52 bar) and where a vacuum condition exists (Model MBV™)
  • Vacuum supports not needed for sizes 0.5", .75" (15 and 20 mm)
  • Temperature ranges -100 degrees Fahrenheit to 400 degrees Fahrenheit (-73 degrees Celsius to 205 degrees Celsius)
  • Armoring is recommended for all graphite disks for added safety, easier installation and elimination of breakage during installation
  • Armor reduces the possibility of a premature burst due to uneven or excessive torqueing of the flange studs
  • All MB™ disks supplied with integral gaskets
  • Available for installation between ANSI, DIN, AFNOR, BS and JIS pipe flanges & located inside the bolt circle

MB™ MonoBloc disks are available in sizes from 0.5" to 24" (15mm to 600mm) with a temperature range to 400ºF (205º C).

MB & MBV Specifications

Nominal Size
Burst Ratings
Internal
Diameter
Disk Thickness
Barg PSIG
mm
in.
min.
max.
min.
max.
mm
in.
mm
in.
15 0.5 1.72 10.3 25 150 16.9 0.625 16 0.625
20 0.75 1.72 10.3 25 150 21.0 0.825 16 0.625
25 1 0.69 10.3 10 150 27.2 1.01 22 0.875
40 1.5 0.49 10.3 7 150 41.1 1.62 22 0.875
50 2 0.21 10.3 2 150 52.6 2.07 22 0.875
80 3 0.14 10.3 1 150 78.0 3.07 22 0.875
100 4 0.10 10.3 1 150 103.4 4.07 22 0.875
150 6 0.069 10.3 1 170 154.2 6.07 22 0.875
200 8 0.035 10.3 0.5 170 205.0 8.07 29 1.125
250 10 0.017 8.6 0.25 150 255.8 10.07 38 1.50
300 12 0.017 8.6 0.25 150 306.6 12.07 51 2.00
350 14 0.017 6.9 0.25 100 336.5 13.25 57 2.25
400 16 0.017 6.9 0.25 100 387.4 15.25 64 2.50
450 18 0.017 6.9 0.25 100 438.2 17.25 70 2.75
500 20 0.017 3.4 0.25 50 489.0 19.25 76 3.00
600 24 0.017 3.4 0.25 50 590.6 23.25 76 3.00

Type AMB and AMBV (armored versions of types MB & MBV) share the above dimensions.

Note: In the case of the MBV disk either a dial type or a bar type vacuum support is integrated into the disk. This will reduce the free vent area to provide the following proportion of the internal bone:

Size 1" 1 1/2" 2" 3" 4" 6" 8" 10" and Larger
Dial Type - 0.56 0.57 0.60 0.62 0.58 0.60 0.60
Bar Type 0.7 0.80 0.80 0.80 0.80 0.80 0.80 0.80

Bar type vacuum supports are recommended for set pressures between 10 psig (0.69 bar) and 22 psig (1.52 bar).

Dial type vacuum supports are recommended for set pressures up to 10 psig (0.69 bar).

Where back pressure resistance exceeding 1 atmosphere is required, bar and dial supports can be used. Please consult BS&B