(6)
Remove elbows (I 7) from cylinder (19, 22,
23, 24 and 25). Unscrew and remove
priority valve (20) and nipple (21) from
cylinder (22). Unscrew and remove the ten-
micron filter (29) and adapter (27) from
cylinder (25).
b.
Cleaning. Refer to paragraph (6-3.a for general
cleaning instructions.
c.
Inspection. Refer to paragraph 6-3.b for general
inspection
requirements.
Specific
assembly
inspection/testing as follows.
(1)
Test the priority valve (20, Figure 8-2)
as follows:
(a)
Screw a 1/8 npt pipe plug in one
side of valve body (12. Figure 8-5). Install priority valve
to be tested in test setup shown in Figure 0-3, or
equivalent.
NOTE
Hydrostatic tester may be used in lieu of air or
nitrogen.
(b)
Close bleed valve and open shut-off valves.
numbers one and two.
(c)
Adjust regulator, increasing pressure to tile
inlet side of the priority valve assembly
under test, until air escapes from priority
valve outlet port.
NOTE
Gauge should indicate 2,200 + I00 psi (5,158 + 690
KPa). If indication is correct, proceed to step (g).
Otherwise, proceed with step (d).
(d)
Remove priority valve assembly from test
setup if specified limit is not obtained as
specified in step (c) of this paragraph.
(e)
Rotate adjusting screw (2, Figure 8-5) in or
out as may be required.
(f)
Re-install priority valve assembly in test
setup and repeat steps (a) through (c). Re
peat steps (d) and (e) until
desired
indication is obtained.
(g)
Close shut-off valve number two (Figure 6-
3) and remove leakage apparatus.
Figure 6-3. Priority Valve Test Setup
6-5
