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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
2.2 Trim Components
e following components complete the set up of any Mv or Lv Series System regardless of the specific
arrangement or number of cylinders utilized.
2.2.1 Pressure Gauge Assembly
P/N 25804 (See Figure 2.2.1)
A pressure gauge for each cylinder provides a reliable means of monitoring the internal pressure condition
of the cylinder as mandated by
NFPA 17. e Mv and Lv Series
pressure gauge has a swivel nut
and O-ring seal allowing it to
connect to the Mv and Lv Series
cylinder valves at the pressure
gauge connection. e pressure
gauge ports of the Mv and Lv
Series cylinder valves contain a
Schrader valve that seals when the
gauge is absent. Refer to Section
4.1.4.1 regarding installation and
removal of the pressure gauge
assembly.
Figure 2.2.1 Pressure Gauge Assembly
1.605 in
40.77 mm
2.19 in
55.6 mm
1. O-Rings must be ordered in packs of 25 as P/N 98791
O-Ring
1
(P/N 18582)
The Mv and Lv Series cylinder assemblies shall not be transported with the pressure gauge assembly installed.
Remove the pressure gauge assembly from the cylinder valve before transporting the Mv Series or Lv Series
cylinder assembly even if the contents are still under pressure. Refer to Section 4.1.4.1 regarding installation and
removal of the pressure gauge assembly.
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