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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
C.1 Legacy Components
is section contains the technical information on parts that are no longer available for purchase. Please
reference these sections for existing systems that utilize these components or to identify the recommended
replacement component.
Attaching the electric valve actuator to the cylinder valve when the actuation pin is not fully locked into the “up”
position may cause the cylinder valve to actuate, resulting in potential injury and/or property damage.
Figure C.1.1 Electric Valve Actuator
1.620 in
41.15 mm
4.175 in
106.0 mm
Knurled Swivel
Nut
DIN Connector
with 1/2” (15 mm) NPS
Female Conduit Hub
with 36” (914 mm) leads
e auxiliary electric valve actuator does not have a supervisory limit switch.
e electric valve actuator has a life span of 25 years from date of manufacture.
NOTE: Electric Valve Actuators with a 1/2 in (15 mm) Conduit Hub (P/N 18481) must be installed with flexible
metal or liquid tight conduit in compliance with all local, state, national and/or international building codes. Refer
to DOC323 Electric Actuator Installation Sheet for a list of UL Listed connectors that meet the requirements of
Underwriters Laboratories and are suitable for use with these actuators.
NOTE: is model of Electric Valve Actuator is being phased out as of 2018 and will only be available for new
systems while supplies last.
C.1.1 Electric Valve Actuator w/o
Supervision
P/N 18481 (See Figure C.1.1)
e auxiliary electric valve actuator attaches
to the primary cylinder at the valve actuation
connection and is utilized to automatically
open the cylinder valve upon receipt of a
signal from the control panel or other source.
It operates between 20.4 and 26.4 VDC and
consumes 500 mA (.5 Amps) at 24 VDC
nominal with a maximum supervisory current
of 30 mA (0.03 Amps).
e auxiliary electric valve actuator body is steel construction with a brass knurled swivel nut and a stainless steel
actuation pin that depresses the valve core when energized. It must be manually reset by pushing the pin up until it
snaps in the “up” position. e electric valve actuator is shipped with a plastic threaded cap on its top port that should
only be removed when installing the manual valve actuator.
Appendix C
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