Flowserve Double-Disc Gate Valve Sizes 2.5 - Manual (Page 27)

27
Anchor/Darling Double Disc Type Gate Valves FCD ADENIM0003-01 - 07/14
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By turning each capscrew a couple of turns, proceeding to the
adjacent capscrew, turning it and then repeating this around the
bolt circle the bonnet will be raised squarely until it is firmly in
contact with the gasket. Although gasket sealing is achieved
by operating pressure pushing the bonnet tightly against the
gasket, it may be necessary to torque the capscrews to the
values shown in Table 3 to obtain a tight seal at low pressures.
NOTE: Although the assembly process is the same for both
metal and graphite pressure seal gaskets, one cannot be
substituted for the other without changing the spacer ring also.
Contact Flowserve for the correct parts.
8.3.4 The same precautions that were used in lowering the bonnet
over the stem should be taken when mounting the yoke.
Remember – stem gouges cause packing leakage.
With yoke in its proper position on the body neck, the halves of
the yoke clamp (012) should easily fit over the mating lips on
the yoke and the body. The yoke clamp studs (204) can then be
inserted, and the nuts (233) threaded on and tightened (refer to
figure 14).
NOTE: When the yoke has been removed, it is often easier to
install the packing before the yoke is remounted. See section
5.4 for instructions on installing the packing.
8.4 Actuators
8.4.1 Manual: Reassembly of both gear actuators and handwheels
can be accomplished by reversing the instructions provided in
Section 6.1.
8.4.2 Motor and Air Cylinder: Instructions pertaining to the assembly
of specific power actuators are included in supplements to this
manual.
Figure 21
Typical bolt tightening sequence