Safety Valve

(6) Install the gasket (18), valve seat (8), valve

(5) Remove the safety valve (9) and preformed

seat seal (9), washer (10), seal retainer (12). and

packing (8) from the adapter (7).

strainer (13).

(6) Remove the reducer (22, fig. 3-3), spring

(7) Install the valve (14) so that the depression in

(23), and needle (24).

the valve is seated over the end of the push rod (19).

b. Inspection. Inspect all parts for damage, wear,

(8) Install the spring (15).

(9) Slide the preformed packing over the

and serviceability.

threaded portion of the plug (17). Screw the plug (17)

c. Assembly and Installation.

into the body (6).

(10) Apply antiseize compound or tape to the

threads on the nipple (21).

(1) Install the needle (24) and spring (23) into the

(11) Screw the nipple (21) into the regulator body

safety valve body (25). Install reducer (22) and tighten.

(6).

(2) Install a preformed packing (8, fig. 2-6) on

(12) Screw the side of the valve body (25) to the

the safety valve (9).

nipple (21).

(3) Connect the safety valve (9) to the adapter

(13) Tighten the pressure regulator (14, fig. 2-6)

(7).

to the safety valve (9) by hand until it is tight and inline

(4) Connect the adapter (7) to the diffusion tube

with one another as shown in figure 2-6.

nut (6).

(14) Install the adapter (13) and tighten.

(5) Cross both hose assemblies (5). Connect

(15) Install a preformed packing (8) on the safety

the quick-disconnect coupling half (3) that is on each

valve (9).

hose to the pipe and cap assembly (4).

(16) Connect the safety valve (9) to the adapter

(6) Connect the carrier pack to the frame with

(7).

the cord removed (fig. 2-8).

(17) Connect the adapter (7) to the diffusion tube

(7) Install the pressure tank and valve assembly.

nut (6).

Refer to TM 3-1040-214-12.

(18) Loosely connect the tube assembly (12) to

the inlet adapter (13).

3-6. Agent Tank and Frame Hardware

(19) Locate the quick-disconnect coupling half

(11) so that is an equal distance between the agent

General support maintenance personnel are authorized

tanks. Tighten the tube assembly nut to the adapter

to replace the hardware that attaches the agent tanks to

(13).

the frame.

(20) Cross both hose assemblies (5). Connect

the quick-disconnect coupling half (3) that is on each

a. Inspection. Visually inspect the hardware that

hose to the pipe and cap assembly (4).

attaches the agent tanks to the frame (fig. 2-8). Check

(21) Connect the carrier pack to the frame with

for damaged and missing hardware.

the cord (fig. 2-8).

(22) Install the pressure tank and valve

b. Removal. Remove the hardware that attaches

assembly. Refer to TM 3-1040-214-12.

the agent tanks to the frame (fig. 2-8).

3-5. Safety Valve

c. Installation.

Install the attaching hardware

removed in b above.

General support maintenance personnel are authorized

to replace the needle, spring, and reducer in the safety

3-7. Carrier Frame

valve.

General support maintenance personnel are authorized

a. Removal.

to replace the carrier frame.

(1) Remove the pressure tank and valve

assembly. Refer to TM 3-1040-214-12.

a. Inspection. Check the frame (10, fig. 2-8) for

(2) To gain access to the safety valve, re- move

possible damage. Check the welds around the plates

one cord attaching the carrier pack to the frame.

and D-rings that are welded to the frame.

(3) Disconnect the quick-disconnect coupling

half (3, fig. 2-6) on each hose assembly.

b. Removal.

(4) Hold the pressure regulator (14) and

disconnect the diffusion tube nut (6) from the adapter (7).

(1) Remove the cords (9) and carrier pack (8).

3-6