(7) Close valve before charging tank.
e. Maintenance.
(1) If either pressure tank, pressure-tank valve, or check valve are damaged or defective, all three must be replaced as a unit. No attempt may be made to repair any of these parts or their connections. If makeshift repairs or improvised parts are devised, serious accidents can result because of the extremely high pressures to which the equipment is subjected.
(2) Keep all threaded connections tightened. If a leak is suspected at any threaded connection, follow procedure in Paragraph [53 d].
67. PRESSURE REGULATOR.
a. Description and functioning. The regulator automatically reduces the variable pressure of air or nitrogen in the pressure tank to a constant operating pressure of approximately 350 pounds per square inch in the fuel tanks. The regulator is located at a protected position in the tank group of the M2-2 portable flame thrower, where it is not readily subject to tampering or damage from the outside. The regulator tube with fittings connects the pressure-tank valve and pressure regulator. ([Fig 33]) Its outlet is connected to the fuel tanks by the diffusion-pipe assembly. ([Par 68 a]) Either of two interchangeable types of regulators is furnished: the spring type (Figs [33], [36], and [37]), and the dome type ([Fig 38]).
Fig 36. Rear of tank group, with carrier removed to show pressure regulator (spring-type) and connections.
b. Removal of pressure regulator. After release of all pressure:
(1) Remove carrier ([Par 71 b]), if necessary.