Page 252 - Valve Selection Handbook
P. 252
Rupture Discs 239
Figure 6-23. Two-Way Rupture Disc
Incorporating Reverse-Acting Teflon® Disc
with Knife Blades. (Courtesy of Continental
Disc Corporation.)
The two-way rupture disc shown in Figure 6-23 consists basically of a
perforated forward-acting rupture disc that is sealed by a Teflon®
reverse-acting disc, followed by a girdle supporting the disc and knife
blades. Under conditions of subnormal pressure, the Teflon® disc will be
forced against the knife blades and be cut. Under conditions of excessive
overpressure, the perforated disc and the supporting Teflon® disc will be
put in tension and rupture.
Graphite Rupture Discs
Graphite is a valuable material from which low-pressure rupture discs
can be produced.