Flowserve Double-Disc Gate Valve Sizes 2.5 - Manual (Page 20)

Anchor/Darling Double Disc Type Gate Valves FCD ADENIM0003-01 - 07/14
20
6.3 Bonnet Removal –
Pressure Seal Joint
6.3.1 Unbolt the yoke clamp bolting (204 & 233) and remove the
yoke clamp (012). (It is advisable to thread the yoke clamp
back together to prevent losing the parts.) The yoke (011) is
now free to be lifted directly from the valve (See Fig. 14)
6.3 Bonnet Removal –
Pressure Seal Joint
6.3.1 Unbolt the yoke clamp bolting (204 & 233) and remove the
yoke clamp (012). (It is advisable to thread the yoke clamp
back together to prevent losing the parts.) The yoke (011) is
now free to be lifted directly from the valve (See Fig. 14).
6.3.2 Unbolt the gland nuts (234) and remove the gland flange (130),
gland (107), and packing per Paragraph 5.4 (Fig. 15).
6.3.3 The bonnet is held in the raised position by capscrews (216)
that draw it up against a bonnet retainer (034). To disassemble,
remove the capscrews and then lift of the bonnet retainer (Fig.
16).
Tap the bonnet sharply to break the seal between it and the
pressure seal gasket (030). The bonnet will drop downward
against its stop, uncovering the gasket retainer (033). If stuck,
apply uniform force to push the bonnet down being careful to
not allow it to cock. If not careful, the pressure seal area in the
body can be damaged.
6.3.4 The gasket retainer (033) is a ring that has been segmented into
four pieces. It is partially recessed in a groove machined in the
body. Remove the segments starting with the piece, which has
a small drilled hole. The groove in the top of the retainer gasket
permits the use of a pry bar or screwdriver in removing the
segments. In some cases, it may be necessary to loosen the
segments by tapping with a hammer or bar.
6.3.5 Remove the spacer ring (032) and the pressure seal gasket
(033) if they are loose enough to move. If not, they may be
removed as a single unit with the bonnet per Paragraph 6.3.6.
6.3.6 The bonnet is now ready for removal from the body. The
tight clearances between the body, bonnet, spacer ring, and
gasket, necessary for a reliable seal, require that the bonnet
be withdrawn squarely from the body neck bore. The slightest
cocking of the bonnet during withdrawal can cause it to bind
and can damage the pressure seal area of the body.
Figure 15
Figure 14