MIL-DTL-62547D
3.4.1.4 Pressure.
3.4.1.4.1 Pressure relief device. The pressure relief device shall relieve extinguishant
pressure at not less than 18,300 kPa (2660 psi) nor more than 20,700 kPa (3000 psi)
(see 4.4.2.1.4.1).
3.4.1.4.2 Pressure indication device. When the extinguisher is initially filled with Halon
1301 and nitrogen as specified in 3.5.1.2, the pressure indicator device shall be in the green area
within the ambient temperature range of -15 °C (5 °F) to 41 °C (105 °F) minimum, at pressures
of 3680 kPa (534 psi) and 6240 kPa (905 psi), respectively. At ambient temperatures of -15 °C
(5 °F), 21 °C (70 °F) and 41 °C (105 °F), the pressure indicator device shall be off and to the left
of the green area at pressures of 3100 kPa (450 psi), 4830 kPa (700 psi) and 5760 kPa (835 psi),
respectively. Where the indicator employs a pointer, the distance separating the pointer and the
fixed or moving reference (green) shall not exceed 1 mm (0.04 in.). The pressure indicator shall
not be damaged in any manner when tested to 20,700 kPa (3000 psi) (see 3.3.1.1.5 and
4.4.2.1.4.2).
3.4.1.4.3 Pressure switch. The pressure switch (see 3.3.1.1.7) shall automatically close
during charging and shall open when the extinguishant pressure is reduced. The switch shall
open as the pressure drops to between 2500 and 2200 kPa (363 and 319 psi) (see 4.4.2.1.4.3).
3.4.1.5 Flow indication device. The flow indication device shall indicate that a period of
flow has occurred within 5 ms after the valve is open or extinguishant flow has been started.
There shall be no flow indicator (see 3.3.1.1.8) prior to the beginning of extinguishant flow
(see 4.4.2.1.5).
3.4.1.6 Quiescence. The discharge valve solenoid circuit and the pressure/flow circuit
shall be capable of accepting continuity monitoring signals of 5 milliamperes (mA) continuously
without valve activation. The resistance of both the solenoid and the pressure/flow circuits shall
not exceed 8 ohms (see 4.4.2.1.6.1 and 4.4.2.1.6.2).
3.4.2 Extinguisher.
3.4.2.1 Anti-recoil device. An anti-recoil device conforming to Drawing 12343134 shall
be securely (wrench tight) installed in the outlet port of the extinguisher discharge valve. The
+0.2-anti-recoil device shall be attached to the receiver cylinder neck with a ring and cable in
accordance with Drawing 12343133. The anti-recoil device shall be removed from the outlet
port of the valve after a safe and secure vehicle installation. No part of the extinguisher, when,
discharged with the anti-recoil device installed, shall move more than 150 mm (6 in.) nor at a
velocity that exceeds 40 millimeters per second (mm/s) [1.6 inches per second (in./s)]
(see 4.4.2.2.1).
3.4.2.2 Manual release lock. The manual release lock, conforming to Drawing 12288692
or Drawing 12343165, shall be a permanent, non-active part of the extinguisher, stored on or in
the valve assembly using a ring and cable in accordance with Drawing 12343133. The
extinguisher shall be delivered with the manual release lock in the discharge-valve-closed
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