The quick-closing shut-off valve under §§ 154.530, 154.532 and 154.538 must:

1. (a) Be a shut-off valve;
2. (b) Close from the time of actuation in 30 seconds or less;
3. (c) Be the fail-closed type; and
4. (d) Be capable of local manual closing.

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 77-069, 52 FR 31630, Aug. 21, 1987]