Cylinder And Valve Assembly; G1 Pressure Reducer With Primary Low Pressure Warning Device - MSA G1 Operating Manual

2.4

Cylinder and Valve Assembly

The cylinder and valve assembly store high pressure air which will be reduced to provide the user
breathable air. Cylinders are available in multiple pressures and rated service times. The valve
assembly provides the user the ability to open the pressure to the rest of the system. The valve
assembly consist of a handwheel for opening and closing the valve, pressure gauge that always
provides the pressure in the cylinder, threaded CGA connection for filling and attachment, and burst
disc for over pressurization.
The SCBA can be attached to the cylinder in multiple configurations. A threaded or quick connection
is available and a threaded cylinder can easily be upgraded to a quick connect attachment. The
cylinder can be connected to the SCBA by a side connection off the cylinder valve (remote connect).
When using a remote connect cylinder, a dove tail interlocking feature is used to secure the cylinder
to the backplate of the SCBA.
Connection Type
Threaded
Quick Connect
Cylinder Capacity
Capacity (Cubic Ft.)
45
45
66
88
* As approved by NIOSH
2.5

G1 Pressure Reducer with Primary Low Pressure Warning Device

The pressure reducer reduces the cylinder pressure to an intermediate pressure, which is in turn
further reduced by the regulator to a pressure that is respirable by the user. The pressure reducer
incorporates a fail safe design which ensures air flow to the user in the event of a malfunction within
the pressure reducer.
The pressure reducer incorporates an intermediate pressure relief valve, and a cylinder connector
with a sintered filter to capture particulates that may be in the air stream.
Universal Air Connection (UAC)
All NFPA approved SCBA are equipped with a UAC fitting (Universal Rescue Connection). The UAC
fitting is a male fitting inlet for use by Rapid Intervention Teams for emergency filling of the SCBA or
during transfill operations.
Connection Location
Remote (side)
Remote (side)
Pressure (psig)
2216
4500
4500
4500
G1
Rated Svc* Life (Min.)
30
30
45
60
Description
US
14