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HIGH PERFORMANCE BUTTERFLY VALVE
FIGURE HPA
13
8.7.8 Slide the stem (3) through the top bearing (08) and
engage the top disc spacer (6) toward the bonnet
when applicable, place the disc (2) and slide the
stem (3) through disc stem bore. Place the lower
disc spacer (6) and push the stem through lower
bearing (7) into the body (1).
8.7.9 Insert the wedge pins (8) into disc holes for wedge
pin. Take care that pin flat surface matches to stem
flat surface and drive them into place. When pins
are correctly installed, the drive shaft will be as
shown in Fig. 7. Cycle the disc 4 to 5 times.
8.7.10 Place the packing spacer (10) into stuffing box
region and insert the set of gland packing (11) into
stuffing box above the packing spacer.
8.7.11 Place the gland (12) above the gland packing.
8.7.12 Install the stem retainer (snap ring) (13) on
the stem.
8.7.13 Fix the gland flange assembly (14) through stem,
insert the Belleville washers (16) and install nut (17),
tighten the nut (17) slowly till to the ISO top flange.
8.7.14 Install the Seat (3) into the Seat Retainer Ring (5).
8.7.15 Insert the seat and seat retainer assembly into the
body with disc in closed position. Apply anti-seize
grease for threading area. Insert the retainer bolts
in alternating sequence.
8.7.16 Cycle the disc and set disc in closed position.
8.7.17 Disc pins to be Tig spot welded after
leakage testing.
8.7.18 When the gear operator or hand lever or actuator
is reassembled on the valve, it may be necessary
to adjust gear operator or hand lever, or actuator
travel stops to ensure proper setting of the
butterfly in the open and closed position).
8.7.19 In case of gear operated valves, install bracket
and coupling and fix the gear unit. Ensure smooth
operation of valve during opening and closing.
8.7.20 In case of actuated valves, install the actuators
per manufacturer’s IOM. Ensure the indicator of
actuator position is matching to valve position
when installing and mounting actuator to valve.
8.7.21 After assembly, the valve shall be tested for
leakage across the seats and through the
stem seals.
8.8 PROCEDURE FOR GLAND
PACKING REPLACEMENT
If further adjustment of the gland packing is inappropriate,
adopt the following procedure for its removal
and replacement.
8.8.1 Remove the operator (lever, gear box or actuator)
in accordance with section 8.5.
•
Remove key from shaft (if applicable).
•
Remove gland nuts.
•
Remove gland, gland flange.
•
Remove gland packings using a
pointed instrument.
8.8.2 Fit new gland packing rings.
8.8.3 Refit gland and gland flange.
8.8.4 Refit gland nuts, tighten evenly until heavy
resistance is felt. During this operation, turn
the stem to ensure that the packing is not
over tightened.
8.8.5 Refit the operator.
SPOT WELD HAS TO BE DONE
AFTER VALVE TESTING
(FIRST WELD IS MADE ON THIS
SIDE)
STEM
WEDGE PIN
Wedge pin
Stem
Spot weld has to be done after valve testing.
(First weld is made on this side)
Fig. 7