UL 429 and Hazardous Locations Approvals
Valves, Electrically Operated
USE AND INSTALLATION
This category covers electrically operated valves which are designated general purpose valves, fire protection service valves or safety valves as indicated in the individual Listings. These valves may be equipped with complementary or optional mechanical actuators.
A general purpose valve is intended to control the flow of a fluid, but is not intended for use as a safety valve or a fire protection valve. It may be a normally closed or normally open valve.
A safety valve is a normally closed valve intended to be actuated by a safety control or an emergency device to prevent the delivery of a fluid. It may also be used as a general purpose valve. A multiple port valve may be designated as a safety valve only with respect to its normally closed port.