TM 9-2330-356-14
b.
Consider the location of the unit to be serviced,
CAUTION
and drain the affected valves and piping.
Uneven tightening of nuts may cause gasket
c.
Consider the size and weight of the unit to be
to pinch.
removed and provide support.
d.
Loosen or remove any item necessary to allow
(5) Install coupling bolts and tighten nuts finger
removal of the unit. In some instances when removing
tight. Tighten the nuts uniformly until coupling halves are
valves, piping may have to be loosened at different places
firmly togethermetal-to-metal. Tighten nuts to torque
to make it easy to remove valve and gaskets.
specified.
4-86. Valves
e. When replacing O-rings, coat with petrolatum
(item 23, Appendix E) to facilitate installation.
a. General. Refer to the General Instructions in
f.
Coat all male threaded pipe fittings with antiseize
tape (item 27, Appendix E) before installation.
b.
Gate Valves (Fig. 4-129).
g. Following the replacement of any unit, test for
(1) Removal. Remove connecting nuts, washers,
leaks and correct if leaks are evident.
and bolts, or two nuts and bolts, from couplings. Remove
couplings. Remove valve and gaskets.
follow procedure below:
(1) Lubricate complete gasket with petrolatum
(item 23, Appendix E).
(2) Slide gasket onto one pipe end. Ensure that
gasket lip does not overhang pipe end.
(3) Aline and bring the two pipe ends together
and slide gasket into position centered between the
grooves on each pipe end. No portion of gasket should
extend into groove on either pipe (fig. 4-128).
(4) Assemble the coupling, being sure edges of
coupling drop securely into grooves. Squeeze housing
tight with hands to further center the gasket and seat the
housing.
TA502383
TA099859
