Section II. GUN ASSEMBLY

TM 3-1040-220-34&P

carries it out through the delivery system for dispersion

into the atmosphere.

operate safety relief valve to allow air pressure in the line

b. Maintenance. Direct support maintenance personnel

between the lever plug valve (25) and check valve (13) to

are authorized to replace the nozzle.

bleed back through the safety relief valve (40).

(1) Removal.

(d) Disconnect nonmetallic hose assembly

(a) Make certain that decontamination

(17) from the 45 elbow (14) at quick-disconnect

operations have been performed (TM 3-1040-22012&P).

coupling half (15).

(b) Remove four bolts (20, fig. 2-3) and

(e) Release the three luggage catches

lockwashers (19) which fasten ball valve (10) to nozzle

securing the support assembly and compressed gas

(12). Be careful during this operation, as removal of

cylinders to the base and remove the support assembly

these bolts will allow the ball valve to partially fall apart.

and compressed gas cylinders.

(f) Loosen pipe fitting seal (41), using a

and elbow (14) from nozzle (12) inlet.

wrench.

(d) Replace the nozzle.

(2) Installation.

(g) Using a wrench, loosen the safety relief

(a) Coat threads of check valve (13) with

valve (40) from the elbow (42).

(h) Unscrew and remove the safety relief

sealing compound (Table 1-1).

(b) Screw check valve (13) and 45 elbow

valve.

(2) Installation.

(14) into nozzle (12) until fingertight. Direction of arrow

on check valve body should point towards the nozzle.

(a) Coat the threads of the relief valve with

sealing compound (Table 1-1).

(d) Install ball valve (10), using 4 bolts (20)

(b) Screw pipe fitting seal (41) onto safety

and lockwashers (19) on nozzle (12).

relief valve (40).

elbow (42) until fingertight. Position the lever so that it

2-11. Safety Relief Valve

can be manually operated from the front of the support

assembly.

a. Description and Function. The safety relief valve

(d) Tighten pipe fitting seal (41) with a wrench

(40, fig. 2-3) is installed in the low pressure plumbing. If

to hold safety relief valve (40) firmly in place.

the pressure regulator malfunctions excessive pressure

(e) Reinstall the support assembly and

could build up in the low pressure plumbing. The safety

compressed gas cylinders on the base and engage the

relief valve operates and exhausts the air pressure to the

three luggage catches.

atmosphere when this pressure increases to

(f) Reconnect the nonmetallic hose assembly

approximately 80 pounds per square inch. In addition,

(17) to the 450 elbow (14) at the quick-disconnect

the relief valve is equipped with a manual safety lever

coupling half (15).

which can be pulled at any time to relieve the air

(g) Reset the safety relief valve (40) by

pressure.

placing the lever in the down position.

b. Maintenance. Direct support maintenance personnel

(h) Close the lever plug valve (25).

are authorized to replace the safety relief valve.

(i) Open the globe valve (18, fig. 2-1) and

(1) Removal.

observe gages for pressure indications.

(a) Close all valves.

(b) Relieve pressure by manually operating

safety relief valve (40).

Section II. GUN ASSEMBLY

2-12. Trigger

the trigger is squeezed, the restriction in the rubber tube

a. Description and Functioning. The trigger (fig. 2-5)

is relieved.

allowing agent under pressure to be

performs the function of a valve in controlling the

dispersed. The trigger spring applies tension to the

dispersal of agent from the gun. The trigger is installed in

trigger, holding it in forward position. Attached to the

the valve body. A rubber tube carries the agent under

trigger is a safety which engages the safety catch to lock

pressure through the gun past the trigger. When the

the trigger in the forward position. The safety has to be

trigger is in the forward position the rubber tube is

depressed and released from safety catch before the

pinched by the trigger thus preventing flow of the agent.

trigger can be squeezed. The trigger is retained in the

When

valve body by a cover plate and screws.

2-12