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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
2.1.3.1 Mv Series Valve Features
(See Figure 2.1.3.1a)
e Mv Series cylinder valve has six key features:
1. Valve Actuation Connection: A threaded connection located on top of the cylinder valve serves as the
attachment point for the electric (primary) or pneumatic (secondary) valve actuator.
2. Pressure Gauge Connection: A female connection serves as the attachment point for the pressure
gauge. It is fitted with a Schrader valve to allow the removal of the gauge while the cylinder is pressurized.
3. Low-Pressure Supervisory Switch Connection: A female connection serves as the attachment point
for the low-pressure supervisory switch. A Schrader valve allows for the removal of the pressure switch
while the cylinder is pressurized.
4. Rupture Disc: A frangible rupture disc is fitted to the valve body opposite the discharge outlet. It
functions as an emergency relief device in the event of excessive internal pressure within the cylinder.
Its rupture point is between 850 psi (58.6 bar) and 1000 psi (68.9 bar). e rupture disc shall not be
removed while the cylinder is under pressure.
5. Discharge Outlet: A 2 in (50 mm) grooved connection serves as the attachment point for discharge
piping.
6. Auxiliary Port: A 1/4 in (8 mm) FNPT port on the side of the valve (shipped with a pipe plug) is not
currently utilized in the dry chemical system.
Figure 2.1.3.1a Mv Cylinder Valve Assembly
Pressure Gauge
Connection (2)
Grooved
Coupling (Part
of Anti-Recoil
Safety Device)
Low-Pressure
Supervisory Switch
Connection (3)
Auxiliary Port
Pipe Plug (6)
Safety
Cap
Rupture
Disc (4)
Valve Actuation
Connection (1)
Discharge
Outlet (5)
Pressure Gauge
Connection (2)
The auxiliary port pipe plug shall remain in place at all times. Removal of pipe plug will cause agent to escape
through the auxiliary port during a system discharge. DO NOT REMOVE THE PIPE PLUG.
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