5
IOM-8310HP-DIFF
Regulator Size
Torque
Bolt Size
1-1/2" - 2" (DN32-50)
50 Ft-lbs (68 Nm)
1/2"
3" - 4" (DN80-100)
100 Ft-lbs (136 Nm)
5/8"
surfaces of both the upper and lower seat rings
(10 and 11) for ex ces sive wear. If either the plug
(12) seats or the seat rings (10 and 11) are worn
and in need of re place ment, contact the fac to ry
for au tho ri za tion to return unit for re pair.
NOTE:
Overhaul and replacement of trim parts is not
easily ac
com plished by non-factory trained
per son nel.
8. Remove the lower body gasket (6) and clean seal ing
sur face thoroughly.
9. Install valve plug assembly (12) up through and into
body (1). Place new body gasket (6) onto body.
10. Align match mark of C. 3 and replace bottom
flange (3) on body (1). Reinstall flange stud nuts
(8). Me chan i cal ly tighten nuts using an al ter nat ing
cross pattern that allows the bot tom flange to be
pulled up evenly. Rec om mend ed torques values
are as follows:
11. Fully thread stem lock nut (19) and pusher plate (17)
on end of valve plug assembly (12). Refer to Figure
1 or 2 for correct orientation of the pusher plate (17).
12. Calibrate valve plug assembly (12) setting as
follows:
a) Lift and hold valve plug assembly (12) up tight
against the seats (10 and 11).
b) Adjust the pusher plate (17) so that the gasket
surface face of the pusher plate (17) is 1/2
rotation below the case flange surface.
NOTE:
Option 1+8
- The gasket surface face of
the pusher plate (17) should be flush with the
top of the lower case flange surface.
c) Secure the “flats” milled on push er plate and
rotate the stem lock nut (19) up tight against
the bottom of the pusher plate (17).
13. Grasp threaded end of valve plug assembly (12)
by hand and ensure that the assembly moves
freely by lifting the valve plug as sem bly (12) in and
out of the seats (10 and 11). If it does not move
freely, rotate valve plug assembly (12) CW until
new position is found which allows optimum “free
vertical move ment” in and out of seats.
14. Proceed with diaphragm assembly in struc tions in
accordance with Section IV.B., steps 10 through
19.
NOTE:
Do not rotate valve plug as sem bly (12)
from optimum “free vertical move ment” po si tion
during final as sem bly.
