Pressure Reducer With Primary Low-Pressure Warning Device; Rapid Intervention Crew/Company Universal Air Connection (Ric Uac); Cylinder And Cylinder Valve Assembly - MSA G1 SCBA Operating Manual

Niosh cbrn/nfpa 2018 edition

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2.4

Pressure Reducer with Primary Low-Pressure Warning Device

The pressure reducer incorporates a fail-open valve design. The pressure reducer connects to the

cylinder valve assembly with a handwheel assembly. The handwheel assembly is available with two

cylinder connection types (threaded, quick-connect). Both connection types include a sintered filter to

capture particulates. The pressure reducer includes a bell alarm for low pressure that actuates

between 33 and 37 percent of the SCBA's rated service pressure during use.

The pressure reducer is equipped with a rapid intervention crew/company universal air connection

(RIC UAC) fitting. The RIC UAC fitting is designed to be used by rapid intervention teams for emer-

gency filling operations. The SCBA includes an automatically resetting pressure-relief valve to vent

excess pressure if the SCBA is overpressurized during an emergency filling operation.

2.5

The cylinder and cylinder valve assembly is available in three rated service pressures (2216 psig,

4500 psig, 5500 psig). The 2216 psig cylinder and cylinder valve assembly is available in one rated

service time (30 minutes) and one material option (carbon). The 4500 and 5500 psig cylinder and

cylinder valve assemblies are available in three rated service times (30, 45, 60 minutes) and one

material option (carbon).

The cylinder valve assembly includes a large pressure gauge with a photo luminescent face. The

handwheel for the cylinder valve assembly is available in two types (standard, locking). The locking

handwheel requires a single action to open and two actions (pull and turn) to close the valve to mini-

mize inadvertent closure. The cylinder valve assembly includes a pressure-relief device to vent pres-

sure safely if the cylinder is overpressurized. The cylinder valve assembly can be equipped with a

male quick-connect adapter to enable connection to a female quick-connect handwheel assembly.

G1 SCBA 2018 Edition

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