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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
Section 2 System Components and Description
2.3.6 Male NPT Adapter
P/N 18625 (See Figure 2.3.6)
A 1/4 in (8 mm) 37° male JIC by MNPT adapter fits into the pilot
actuation end line tee of the final secondary cylinder to facilitate
the attachment of the pilot actuation line. It also may be utilized to
facilitate the attachment of flex hose to the discharge pressure switch.
2.3.7 Pilot Actuation End Line Tee
P/N 18611 (See Figure 2.3.7)
A 1/4 in (8 mm) FNPT by MNPT brass branch tee mounts to
the final pneumatic valve actuator to facilitate attachment of the
vent check to the pilot actuation line.
2.3.8 Flex Hose
Refer to Table 2.3.8 for P/N (See Figure 2.3.8)
Flex hoses are 3/16 in (7 mm) Teflon® lined stainless steel wire
braided hoses of varying lengths with 1/4 in (8 mm) 37° female
JIC flare fittings. ey are utilized to interconnect cylinders when
a multi-cylinder arrangement is required. Flex hose can also be
used to attach the discharge pressure switch to a manifold.
Note: Flex hoses must be hydrostatically tested or replaced
every 5 years.
Table 2.3.8 Flex Hose Lengths
P/N Hose Length (L) Series
18648 16 in (406 mm) N/A
18649 24 in (610 mm) Mv - 200 lb
18650 34 in (864 mm) Mv - 600 lb
18651 40 in (1016 mm) Lv - 1000 lb
1.42 in
36.1 mm
Figure 2.3.6 Male NPT Adapter
L
Figure 2.3.8 Flex Hose
1.52 in
38.6 mm
1.76 in
44.7 mm
Figure 2.3.7 Pilot Actuation End Line Tee
1.14 in
29.0 mm
1.78 in
45.2 mm
Figure 2.3.5 Pilot Actuation Mid Line Tee
2.3.5 Pilot Actuation Mid Line Tee
P/N 18622 (See Figure 2.3.5)
A 1/4 in (8 mm) 37° male JIC by MNPT brass branch tee is
utilized to attach the pilot actuation line to the pneumatic valve
actuator on all but the final secondary cylinder.
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