December 2008
Section 3 KP Design
Page 3 – 39
Amerex Restaurant Fire Suppression System (EX 4658)
MECHANICAL GAS VALVE APPLICATIONS
The MRM, MRM II or PRM closes the mechanical gas valve immediately upon system discharge. A pneumatic
and mechanical action in the gas trip assembly pulls on a cable attached to the mechanical gas valve,
unlatching the valve and allowing an internal spring within the gas valve body to provide the closing force.
Connection of the cable from the gas valve to the MRM, MRM II or PRM under tension maintains the gas valve
in an open position.
MECHANICAL GAS VALVE
A mechanical gas valve trip assembly must be used
with any mechanical gas valve. The gas valve trip
assembly (P/N 12740) is included with all Amerex
manufactured gas valves but must be ordered
separately for use with gas valves listed in this
manual supplied by other manufacturers.
MECHANICAL GAS VALVE ACTUATION NETWORK LIMITATIONS
The mechanical gas valve actuation network consists of cable, corner pulleys, pulley tee, gas valve and conduit
offset.
GENERAL LIMITATIONS OF MECHANICAL VALVE NETWORK
Maximum of 20 corner pulleys per mechanical gas valve of any listed type in KP Manual
Maximum of 130 feet (39.6m) of cable per mechanical gas valve of any listed type in KP Manual
Maximum of 1 pulley tee per network (counts as one corner pulley for each mechanical gas valve)
Maximum of 1 conduit offset per network (must be located at the releasing module
and before the tee pulley
when used)
DUAL GAS
VALVE
NETWORK
MRM or
ERM
PULLEY
TEE
DENOTES "SINGLE PATH" FOR
CABLE LENGTH & PULLEY
QUANTITY CALCULATION.
SINGLE GAS
VALVE
NETWORK
MRM or
ERM
CONDUIT OFFSET
(OPTIONAL)
See Section 3 “System Components” for all mechanical gas valves that are suitable
for use with the Amerex Restaurant Fire Suppression System. The use of any other
mechanical gas valves will avoid the UL listing for the system installation. All of the
listed valves have female NPT threads. The location of the gas valve should be
accessible and approved by the local Authority Having Jurisdiction. A contractor
licensed and qualified for such work should perform installation of the mechanical gas
valve into the gas line.
MRM
or
MRM II
or
PRM
MRM
or
MRM II
or
PRM
