Page 246 - Valve Selection Handbook

Rupture Discs 233

Figure 6-14. Exploded View of
Reverse-Buckling Disc with Knife
Blades. (Courtesy of Continental
Disc Corporation.)

cyclic or pulsating pressures, it is non-fragmenting, and it may be offered
for 90% operating ratio, zero manufacturing range, and plus/ minus 2%
burst tolerance.
Its disadvantages are the knife blades must be kept sharp, and it is not
suitable for liquid-full systems.

Reverse-buckling disc with teeth ring. The reverse-buckling disc
shown in Figure 6-15 is provided with a teeth ring that pierces and cuts
the rupture disc on buckling. The disc offers advantages and disadvan-
tages similar to the reverse-buckling disc with knife blades, but is
designed for considerably lower burst pressures.

Reverse-buckling disc cross-scored. Figure 6-16 shows a rupture disc
that is cross-scored on the concave side. Upon buckling, the disc will
break open in pie-shaped sections along the score lines, with the base
firmly held by the holder.