IOM-POSR-2
7
19. Using a sharp edged tool, clean all gasket
sur fac es, and metal-to-metal contact sur fac es
of body (1), valve seat (4.1) and body cap (9).
20. Lap plug (4.2) with valve seat (4.1) using
a suitable lapping compound. Do for new
re place ment plug (4.2) and seat (4.1) also.
21. Solvent clean all loose internal parts of pilot
valve (PV). Inspect the valve seat (4.1) and
plug (4.2) for wear. Replace the valve seat
(4.1) and plug (4.2) together, even if only one
piece shows significant wear. Solvent clean
body (1).
22. Place body (1) into vise with body cap (9)
opening upwards.
23. Place seat gasket (8) into recess.
24. Put thread lubricant onto valve seat (4.1), and
rotate valve seat (4.1) into threaded recess
by rotating CW (viewed from above) until seat
(4.1) shoulders against body (1).
25.
NOTE:
Replace screen (6) only if necessary.
Using a 3/4" (19 mm) round bar, form and
interlock the flat screen (6) similar to the
removed screen (6) being re placed. Slide
formed screen (6) off of bar. Insert the screen
into the body recess and over the hex points
of the valve seat (4.1). Ensure concentricity
of positioned screen (6).
26. Place plug spring (7) into recess of plug (4.2),
and position plug’s (4.2) stem-end through the
valve seat (4.1).
27. Place thread lubricant on threads of body cap
(9). Capture protruding plug (4.2) end and plug
spring (7) with body cap (9) recess. Rotate
body cap (9) CW (viewed from above) until
shouldering on body (1). Hammer rap wrench
handle to ensure tightness.
28. Remove body (1) from vise and reposition
with di a phragm flange oriented on top.
29. Place thread sealant/lubricant onto threads
of bellows (11). Insert flat-end of stem
extension (10) into the center of the bellows
(11); cham fered end of stem ex ten sion (10)
should be protruding bellows (11). Invert
bellows (11) with stem extension (10) into
body (1) recess. Allow stem extension (10) to
“fall” into thread ed opening for bellows (11).
Align threaded por tion of bellows (11); rotate
CW (viewed from above) the same number
of engaged rev o lu tions recorded in article 8.
previous, this sub sec tion.
30. Place diaphragm gasket (13) onto body’s (1)
flange aligning cutouts of gasket (13) with bolt
hole open ings.
31. Place diaphragm(s) (12) onto body (1)
po si tioned concentrically.
NOTE:
Reassemble
pilot valve (PV) ONLY with the number of
di a phragms (12) disassembled with; the 5–15
psig (0.34–1.03 Barg) spring range uses only
one diaphragm (12).
32. Concentrically position pressure plate (14)
onto diaphragm(s) (12).
33. Set range spring (15) over hub of pressure
plate (14).
34. Place multi-purpose, high temperature grease
into recess of spring button (16) where
ad just ing screw (19) bears. Place spring
button (16) over top-end of range spring (15)
with greased recess on top side.
35. Clean threads of diaphragm bolting (17) (18).
Place thread lubricant on bolts (17). Engage
two sets of bolting (17) (18) for ease in ro ta tion;
disengage.
36. Place the two bolts (17) of above ap prox i mate ly
180° across through body (1) di a phragm
flange from un der neath side. Hold bolts (17)
with fingers of one hand to keep from falling
downwards.
37. Set spring chamber (2) down over the two
pro trud ing bolts (17), aligning the matchmarks
of article 3. pre vi ous, this subsection.
38. Place the two nuts (18) onto bolts (17) of
above, and finger-tighten.
39. Place remaining bolts (17) through spring
cham ber (2) bolt hole openings. Engage all
nuts (18) onto bolts (17) along underneath
side of body (1) flange and finger-tighten.
40. Remove the two upside-down bolts (17) and
nuts (18) and rotate to position of other bolts
(17). Place nameplate tag (21) over one of
the bolts (17) before replacing into bolt hole.
Fin ger-tighten nuts (18).
41. Observe through opening in top of spring
