Assertion: sprinkler's operation | /r/SimilarTo | dry systems
Facets:
Source sentences:
text: The operation of single interlock systems are similar to dry systems except that these systems require that a "preceding" fire detection event, typically the activation of a heat or smoke detector, takes place prior to the "action" of water introduction into the system's piping by opening the pre-action valve, which is a mechanically latched valve (i.e. similar to a deluge valve).