XVIII. Part Inspection of Pilot Valve
After the valve has been disassembled, all parts should be given a visual inspection. Some key areas to check with
the boundaries for reworking parts are listed blow.
A. 39PV07/37
1.
Main Piston:
Galling or excessive wear on the
small diameter end where it engages the spring
seals or on the spherical bearing surface. Any
corrosion or pitting that appears detrimental to the
function of the valve. The part can be polished as
long as the outside diameter of the stem remains
at .243 ± .001” (6.18 ± 0.03 mm). The stem itself
must have a T.I.R of .001” (0.03 mm) along its
length. The upper diameter where the Spring Seal
(Main Piston) rides must be 1.495 ± .001 (37.97 ±
0.03 mm) on 39PV07 model or .970 ± .001” (24.64
± 0.03 mm) on 39PV37. A surface finish of 8 RMS
must be maintained for proper sealing on these
surfaces.
2.
Insert Top:
Galling or excessive wear on the inside
diameter that guides the Main Piston. Check for
any corrosion or pitting. Also, check for galling of
threads.
3.
Insert Bottom:
Galling or excessive wear on the
inside diameter that guides the Main Piston. Check
for any corrosion or pitting.
4.
Adjuster Top:
Galling or excessive wear on the
inside diameter that guides the Main Piston. Check
for any corrosion or pitting. Also, check for galling
of threads.
5.
Adjuster Bottom:
Galling or excessive wear on
the inside diameter that guides the Main Piston.
Check for any corrosion or pitting. Also, check for
galling of threads.
6.
Top Plate:
Galling or excessive wear on the inside
diameter that guides the Main Piston. Check for
any corrosion or pitting. Also, check for galling of
threads.
7.
Bonnet:
Check for any corrosion or pitting. Also,
check for galling of threads for the compression
screw and where it attaches to the Pilot Base.
8.
Compression Screw:
Galling at the spherical
bearing surface or in the thread. Check for any
corrosion or pitting.
9.
Spring Washer(s):
Galling at the spherical bearing
surface. Check for any corrosion or pitting.
10.
Pilot Base:
Check for any corrosion or pitting.
Also, check for galling of threads.
11.
Spring:
Check for any corrosion or pitting.
B. 39MV07
1.
Main Piston:
Galling or excessive wear on the
small diameter end where it engages the spring
seals or on the spherical bearing surface. Any
corrosion or pitting that appears detrimental to the
function of the valve. The part can be polished as
long as the outside diameter of the stem remains
at .243 ± .001” (6.17 ± 0.03 mm). The stem itself
must have a T.I.R of .001” (0.03 mm) along its
length. The upper diameter where the Spring Seal
(Main Piston) rides must be 1.495 ± .001 (37.97 ±
0.03 mm) on 39PV07 model or .970 ± .001” (24.64
± 0.03 mm) on 39PV37. A surface finish of 8 RMS
must be maintained for proper sealing on these
surfaces.
2.
Insert Top:
Galling or excessive wear on the inside
diameter that guides the Main Piston. Check for
any corrosion or pitting. Also, check for galling of
threads.
3.
Insert Bottom:
Galling or excessive wear on the
inside diameter that guides the Main Piston. Check
for any corrosion or pitting.
4.
Adjuster Top:
Galling or excessive wear on the
inside diameter that guides the Main Piston. Check
for any corrosion or pitting. Also, check for galling
of threads.
5.
Adjuster Bottom:
Galling or excessive wear on
the inside diameter that guides the Main Piston.
Check for any corrosion or pitting. Also, check for
galling of threads.
6.
Top Plate:
Galling or excessive wear on the inside
diameter that guides the Main Piston. Check for
any corrosion or pitting. Also, check for galling of
threads.
7.
Bonnet:
Check for any corrosion or pitting. Also,
check for galling of threads for the compression
screw and where it attaches to the Pilot Base.
8.
Compression Screw:
Galling at the spherical
bearing surface or in the thread. Check for any
corrosion or pitting.
9.
Spring Washer(s):
Galling at the spherical bearing
surface. Check for any corrosion or pitting.
10.
Pilot Base:
Check for any corrosion or pitting.
Also, check for galling of threads.
11.
Spring:
Check for any corrosion or pitting.
Consolidated 2900 Series Generation II POSRV Instruction Manual
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