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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
2.5 Supplemental Components
e following components are either only required for specific types of Mv and Lv Series System arrangements
or else may be utilized in different capacities or locations depending on the specific arrangement.
2.5.1 Manifold Check Valve
P/N 18546 (Mv) 18538 (Lv) (See Figure 2.5.1a and 2.5.1b)
In a multiple cylinder arrangement where the secondary and primary cylinders share a common manifold
or in a connected main/reserve arrangement, a manifold check valve must be placed between the discharge
outlet and the discharge manifold. e manifold check valve prevents back flow from the manifold should
the system be inadvertently discharged when one or more cylinders are disconnected for weighing or
servicing. e check valve required depends on the Series type of the system. e Mv Series has 2 in (50
mm) FNPT connections and the Lv Series has 3 in (80 mm) grooved connections.
5.625 in
143 mm
11.5 in
292 mm
Figure 2.5.1a
Lv Manifold Check Valve
Figure 2.5.1b
Mv Manifold Check Valve
8.2 in
209 mm
6.25 in
159 mm
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