MIL-DTL-62547D
3.3.1.1 Configuration. The valve shall conform to the physical and dimensional
requirements of Drawing 12370477. The discharge valve shall include a fill valve, an inlet and
an outlet port, an inlet port vent, a safety relief device, a pressure gage, an extinguisher
availability (charge and flow condition) signal device(s) and a standard electrical connector
receptacle (see 4.4.1).
3.3.1.1.1 Fill valve. The fill valve for charging both Halon 1301 and nitrogen shall
conform to MS28889-2, or equivalent (see 4.4.1).
3.3.1.1.2 Inlet port. The inlet port shall be externally threaded, and as specified on
Drawing 12370477 (see 4.4.1).
3.3.1.1.2.1 Inlet port vent. The inlet port threaded connection shall incorporate a means
to vent pressure within the extinguisher during valve removal. The vent shall be in accordance
with Drawing 12370477. The venting shall occur while no less than four threads remain
engaged (see 4.4.1).
3.3.1.1.3 Outlet port. The outlet port shall be internally threaded, and as specified on
Drawing 12370477 (see 4.4.1).
3.3.1.1.4 Safety relief. The safety relief device shall be as specified on Drawing
12370477 (see 4.4.1).
3.3.1.1.5 Pressure gage. The pressure gage shall be a go-no-go temperature
compensated/coordinated device conforming to Drawing 12314510 (see 3.4.1.4.2 and 4.4.1).
3.3.1.1.6 Availability signal. The availability signal device(s) shall inform the fire
extinguishing system logic as to the availability of the extinguisher to be fired. The device(s)
shall be wired in a circuit between connector receptacle pins (see 3.3.1.1.9.1) in accordance with
table I and shall indicate whether extinguishant pressure is adequate and whether flow has been
initiated (see 4.4.1).
3.3.1.1.7 Pressure signal. The pressure signal shall be provided by a pressure switch
which, normally, shall be open at ambient pressure. The switch shall close during extinguisher
charging and open when the extinguishant pressure has dropped as described in 3.4.1.4.3 (see
4.4.1).
3.3.1.1.8 Flow signal. The flow signal shall be provided by a normally closed switch
which shall open within 5 milliseconds (ms) from the time of valve opening or the start of Halon
1301 flow. The switch shall remain open until it is reset (manually, automatically, or by the
extinguisher recharging). The switch shall remain open until the extinguishant pressure is below
the pressure switch setting, when it may reset (see 4.4.1).
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