Check Valve - TM-3-1040-220-34-P0020

TM 3-1040-220-34&P

(h) Remove thrust washer (5) from valve stem.

(g) Insert the valve stem in valve body (14)

(i) Remove stem seal (7).

making sure that the stem engages the slot in ball (15).

UI) Remove remaining bolts (9) which fasten

(h) Install and tighten locknut (4).

flange (11) to valve body (14). Remove lock plate (8).

(i) Place lock stop plate (3) on the valve stem

(k) Remove flange (11) and two body seals (12)

(6).

and 17).

(j) Install handle (2).

(1) Force ball (15) from the valve body (14).

(k) Install and tighten nut (1).

This will push out seat ring (16) which forms a

seal between the ball and the valve body.

2-9. Check Valve

(m) Push out the second seat ring (13) from the

a. Description and Function. The check valve (13, fig.

other end of the valve body.

2-3) permits free flow of air in one direction, while

(2) Cleaning. Thoroughly clean all parts of the ball

preventing air to flow in the opposite direction. This

valve with drycleaning solvent. Wipe the parts dry with a

valve is mounted between the nozzle and the 45 elbow

clean, soft cloth.

(14). It is installed so that air is permitted to flow into the

(3) Inspection.

nozzle (12), but not in the reverse direction of the

(a) Inspect flange for nicks, scratches, damaged

45elbow (14). The check valve consists of a body and

threads, and general condition.

cap, a poppet and spring, and a rubber seal disk. An

(b) Check body seals (12 and 17) thrust washer

arrow stamped on the side of the valve indicates the

(5) and stem seal (7) for wear or damage.

direction in which the valve will allow free flow of air.

Replace if damaged.

b. Maintenance. Direct support maintenance

personnel are authorized to replace the check valve.

nicks, and abrasions. Check the concave face for

(1) Removal.

irregularities. Replace if damaged.

(a) Make certain

that

decontamination

(d) Inspect ball (15) for roundness, wear,

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

scratches, and abrasions. Check the valve stem (6) for

(b) Using a wrench, remove check valve (13, fig.

wear and damage.

2-3) from nozzle (12).

(e) Examine valve body (14) for nicks scratches,

and general condition.

Check the body bore for

check valve inlet.

roundness wear, scratches, and abrasions.

(d) Replace the check valve (13).

Inspect valve stem (6) and handle (2) for general

(2) Installation.

condition and improper operation. If damaged or worn,

(a) Coat the threads on both ends of check valve

report to general support maintenance personnel.

(13) with sealing compound (Table 1-1).

(f) Inspect lock stop plate (3) and lock nut (4) for

(b) Screw 45-degree elbow (14) into the inlet

general condition. Check chain and S link (10), lock

side of the check valve (13) and tighten with a wrench.

plate (8) and quick release pin (18) for damage.

Examine the chain for broken links.

the input side of nozzle (12) and tighten with a wrench.

(4) Assembly. To assemble the ball valve, proceed

as follows: (a) Install one seat ring (13) in valve body

2-10. Nozzle

(14).

a. Description and Function. The nozzle (12, fig. 2-3)

(b) Place ball (15) in the valve body (14),

is connected to a check valve (13) on the inlet side, while

positioning it carefully so that the slot in the ball is under

the outlet side is connected to the ball valve (10). When

the opening for the valve stem (6). Install seat ring (16).

the nozzle is mounted on the container, the nozzle is

secured to the container by a clamp assembly and is

and place flange (11) against valve body.

sealed by a preformed packing. Low pressure air enters

(d) Place chain and S link (10) and lock plate (8)

through the inlet side of the nozzle. At this point, the

in position and install four bolts (9).

pressurized air also passes into the agent tank. In

(e) Install stem seal (7).

addition, the nozzle inlet side is in line with another small

(f) Place the assist tool (part of ball valve parts

hole which passes low pressure air through from the inlet

kit) over valve stem (6) until it seats on the valve stem

side. This arrangement creates an air jet in the nozzle

shoulder. Slide thrust washer (5) over the assist tool and

when

the

ball

valve

(10)

open

and

into plate on the valve stem.

Remove the assist tool.

2-11