Instruction Manual

Instruction Manual
D100390X012
ED Valve
October 2014
9
Figure 4. PTFE/Composition Packing Arrangements for Plain or Extension Bonnets
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER (KEY 13)
PACKING RING (KEY 7)
PACKING BOX
RING (KEY 11)
LANTERN RING
(KEY 8)
12A8088-A
12A7815-A
12A8173-A
A5904
9.5 mm
(3/8-INCH)
STEM
12.7 mm
(1/2-INCH)
STEM
19.1, 25.4, & 31.8 mm
(3/4, 1 & 1-1/4 INCH)
STEM
TYPICAL (DOUBLE) ARRANGEMENT
Note
Proper performance of the bolting procedures in step 10 compresses the spiral wound gasket (key 12, figure 19 or 20) or load ring
(key 26, figure 21) enough to both load and seal the seat ring gasket (key 13, figure 19, 20, or 21). It also compresses the outer
edge of the bonnet gasket (key 10, figure 19 through 21) enough to seal the body-to-bonnet joint.
The bolting procedures in step 10 include--but are not limited to--ensuring that bolting threads are clean, and evenly tightening
the cap screws, or the nuts onto the studs, in a crisscross pattern. Tightening one cap screw or nut may loosen an adjacent cap
screw or nut. Repeat the crisscross tightening pattern several times until each cap screw or nut is tight and the body-to-bonnet
seal is made. When the operating temperature has been reached, perform the torquing procedure once again.
10. Install bolting, using accepted bolting procedures during tightening, so that the body-to-bonnet joint will
withstand test pressures and application service conditions. Use the bolt torques in table 3 as guidelines.
11. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 3, 4, or 5.
Place a smooth-edged pipe over the valve stem and gently tap each soft packing part into the packing box.
12. Slide the packing follower, upper wiper, and packing flange (keys 13, 12, and 3, figure 18) into position. Lubricate
the packing flange studs (key 4, figure 18) and the faces of the packing flange nuts (key 5, figure 18). Install the
packing flange nuts.
13. For spring-loaded PTFE V-ring packing, tighten the packing flange nuts until the shoulder on the packing follower
(key 13, figure 18) contacts the bonnet.
For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 4. Then,
loosen the packing flange nuts, and retighten them to the recommended minimumtorqueshownintable4.
For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts
reaches the minimum rec ommended torque shown in table 4. Then, tighten the remaining flange nut until the
packing flange is level and at a 90-degree angle to the valve stem.
For ENVIRO-SEAL or HIGH-SEAL live-loaded packing, refer to the note at the beginning of Packing Maintenance.
14. Mount the actuator on the valve assembly and reconnect the actuator and valve stem according to the procedure
in the appropriate actuator instruction manual.