Flowserve V-378 R1 Edward Equiwedge Gate Valve - Manual (Page 27)

27
Flow Control Division
Edward Valves
Reassembly Instructions for Valves with Metal Gaskets Only
(cont.)
4. Assemble a new pressure seal gas-
ket, the spacer ring, junk ring and
gland on the bonnet. Lift the bon-
net using a hoist if necessary, and
place it over the stem and lower
into the body. Be very careful not
to mar the pressure seal gasket or
other machined surfaces.
5. Install the gasket retainer ring seg-
ments in the body groove. Place
the bonnet retainer over the stem
onto the top of the body.
6. Lift the stem and bonnet assembly
up through the gasket retainer and
realign the studs with the bonnet
retainer and match marks.
7. Assemble the nuts on the bonnet
retainer studs and snug them up.
8. Lift the yoke assembly over the
stem and engage the stem threads
by turning the yoke bushing coun-
terclockwise. When the yoke con-
tacts the body, align the bolt holes
(or match mark) and continue to
turn the yoke bushing until the stem
contacts the backseat firmly.
9. Install the cap screw (or yoke lock
ring) and tighten the cap screws
(or studs and nuts) to the torque
values shown on Table 2, pg. 7.
See step 13 below.
10. Tighten the bonnet retainer nuts
carefully using a torque wrench in
a star pattern to the values shown
on Table 2, pg. 7.
11. Install new packing following the
instructions on pg. 6. Place the
gland in position and tighten the
gland bolts evenly.
12. Reassemble the handwheel (or
actuator) using the reverse of the
instructions for disassembly.
13. After the valve has been pressur-
ized,retighten the bonnet retainer
nuts to the same torque values
used in step 10. This is important.