Flowserve Cast Flex Wedge Gate Valve - Manual (Page 26)

Cast Flex Wedge Gate Valves FCD ADENIM0010-02
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6.0 DISASSEMBLY
(Continued)
6.3.2 Bonnet: (Figs. 16 & 17, Continued)
f. The preferred method of lifting the bonnet (See Fig. 18) is by using slings attached to the gland retainer (131). This
means of lifting minimizes cocking. In order to attain the best attachment, the gland bolts (209) should be removed
and the retaining rings' halves be reassembled on the bonnet. If desired, the sling can be looped through the
retaining ring ears prior to assembly on the bonnet. Attempting to remove the bonnet by raising the stem, either with
slings or the actuator, is not recommended. The load between the stem and the bonnet will be imparted to the
backseat. Excessive force on the backseat sealing surface will cause it to deform or crack.
g, Following the above procedure will, in most cases, result in removal of the bonnet with little difficulty, However,
certain circumstances such as installation of the valve with stem in other than a vertical orientation may cause
complications, If greater difficulty is encountered, an ADV service engineer should be consulted, Excessive force
which may damage critical surfaces should be avoided.
h. It is not normally recommended that the pressure seal gasket be reused. However, if a spare gasket is not
available, mark the gasket, bonnet and body prior to removal so that the gasket may be reinstalled in its original
orientation.
6.3.3 Disc And Stem Removal/Installation
Removal of the disc and/or stem is the same as for bolted bonnet valves. Exercise caution that the disc does
not slide off the stem T-head prematurely while being lifted.
Figure 18