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TM 07661B-14/1
APPENDIX A
A 3-32. DRY CHEMICAL PRESSURE REGULATOR. (figure 3-18)
a.
Disassembly.
(1)
Remove seal wires (20), loosen locknut (2), then remove adjusting screw (1), releasing spring tension.
(2)
Put the body of the regulator in a vise with soft jaws. Clamp across hex on body, using care not to damage
any ports or machine surfaces. Using an adjustable wrench on hex of spring housing cap, turn the cap (3)
counterclockwise to remove from body (11).
(3)
Remove spring button (5), inner adjusting spring (6), and outer adjusting spring (7).
(4)
Remove the diaphragm assembly (8), deflector (10) and stem extension (14) from regulator body. Discard
diaphragm o-ring (9).
(5)
Remove the back plug (19), o-ring (18), spring (17), and seat assembly (16). Discard the o-ring.
(6)
Use a socket wrench to remove nozzle (15).
(7)
Remove safety valve (12) and pipe plugs (13) from outlet ports.
b.
Assembly
NOTE
All parts should be clean and dry before assembling.
(1)
Place regulator in a soft-jawed vice with bottom up. Install nozzle (15) in opening in body, tighten with
socket wrench.
(2)
Install seat assembly (16) on nozzle, centering it on the stem extension (14).
(3)
Put spring (17) into bore of seat assembly (16).
(4)
Install new o-ring (18) on back plug (19), using care not to damage o-ring on plug threads. Install the back
plug into body and tighten to 35 foot pounds of torque.
(5)
Remove regulator from vise, turn end cap end upward.
(6)
Put a new diaphragm o-ring (9) on body, seating fully in its groove on lip of body.
(7)
Install stem extension (14) through center of nozzle into recess in bottom of centralizer bushing at center of
diaphragm assembly.
(8)
Install deflector (10) and new diaphragm assembly (8) on body, centering it over diaphragm o-ring.
(9)
Place inner adjusting spring (6) and outer adjusting spring (7) over the diaphragm nut at center of
diaphragm assembly. Put spring button (5) on top of the assembled springs, convex side of button toward the springs.
(10)
Inspect the threads in bushing (4) of spring housing cap (3). If threads show any evidence of wear or
distortion, the spring housing cap should be replaced.
(11)
Install spring housing cap (3) carefully over the assembled springs and diaphragm, and thread it onto body
(11). Tighten to 50 foot pounds of torque.
(12)
Coat threads of safety valve (12) and pipe plugs (13) lightly with Loctite 59-31, or equivalent sealant; install
in body outlet ports.
A 3-41
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