In a dry pipe system, there is no water standing in the pipe – it is being held back by what type of valve?

A.
Relief valve

B.
Emergency valve

C.
Release valve

D.
Clapper valve

Explanation:
In a dry pipe system, there is no water standing in the pipe — it is being held back by a clapper valve. In the
event of a fire, the valve opens, the air is blown out of the pipe, and the water flows.
Incorrect Answers:
A: The valve used in a dry pipe system is called a clapper valve, not a relief valve. Therefore, this answer is
incorrect.
B: The valve used in a dry pipe system is called a clapper valve, not an emergency valve. Therefore, this
answer is incorrect.
C: The valve used in a dry pipe system is called a clapper valve, not a release valve. Therefore, this answer is
incorrect.

Krutz, Ronald L. and Russell Dean Vines, The CISSP and CAP Prep Guide: Mastering CISSP and CAP, Wiley
Publishing, Indianapolis, 2007, p. 463