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HIGH PERFORMANCE BUTTERFLY VALVE
FIGURE HPA
12
8.5.8 Close the valve completely and remove operator
unit. Unscrew the lever lock bolt. Lift the lever by
pressing the latch of the lever out of the stem in
case of hand lever operated valve.
8.5.9 Disconnect supply source and remove the
pneumatic/electric/hydraulic actuator unit. Do
not remove a spring return actuator unless a
stop-screw is carrying spring force. Lift the gear
operator out of the stem by removing the bolts in
case of gear operated valve.
8.5.10 Secure body in a suitable clamping device without
damaging it.
8.5.11 Remove all retainer screws (9) and remove the
seat retainer (5).
8.5.12 Remove the seat (04) and replace it.
8.5.13 Remove counter sunk screws (24) and mounting
plate (23) on wafer and lug valve sizes above
12" (see 9 B). For double flange type (see 9 C),
remove hex bolts (23), spring washers (25) and
bracket (23).
8.5.14 Remove the hex nuts (17) and Belleville washer
(16) from gland flange (17) and remove the
gland flange(14). The studs (15) do not have to
be removed.
8.5.15 Remove the wedge pin welds by grinding or
machining off the welds and remove the wedge
pin (8).
8.5.16 Remove the stem retainer (snap ring) (13) and pull
the stem (3) out and remove the disc spacers (6),
gland (12) gland packing (11).
8.5.17 Gently pull the disc (2) from the body (1).
8.5.18 Remove the bottom flange bolt (21), spring
washers (20) and remove the bottom cover (19).
8.5.19 Remove the bottom gasket (18).
8.5.20 Remove top bearings (7) either from top of the
valve or the waterway.
8.5.21 Remove the bottom bearings (7).
8.6 REPAIR OF COMPONENTS
8.6.1 The metallic parts should be cleaned.
8.6.2 After cleaning components, examine for damaged
parts. Ensure that there are no scoring marks on
the metallic sealing surfaces. Check the seals for
scratches/wear.
8.6.3 Replace the damaged parts. The parts such
as seats and stem packing bearings are
recommended to be replaced with new ones
whenever the valve is disassembled.
8.7 ASSEMBLY PROCEDURE
8.7.1 Inspect and clean all parts to make sure they
are free of dust, grit or other material. A new
set of gasket and seals shall be used once
the valve is disassembled. Refer to Section 9
for recommended spare parts. Replace any
damaged parts.
8.7.2 Before assembly, visually inspect all the valve
components for damage. Look for damage to the
seating areas on the disc and check parts as per
bill of material.
8.7.3 Apply rust preventative oil to parts, wherever
applicable (i.e., body and disc stem bore in case of
CS material).
8.7.4 Place the body (1) on a clean work surface. Install
the bearings (7) with the help of mandrill into
the upper stem bore and lower stem bore of the
body. Refer to 9A, 9B, 9C for quantity of bearings
required for each construction.
8.7.5 Place the cover gasket (18) from bottom side.
8.7.6 Assemble bottom cover (19) and fasten the bolts
(21) with spring washers (20) of bottom cover.
8.7.7 For smooth assembly of the stem (3) into the disc
(2), it may be necessary to coat the stem (3) and
disc bore lightly with a lubricant compatible with
the media to be handled by the valve.
CAUTION:
•
Before removal of the valve, ensure that the line is fully depressurized.
•
Improper handling may cause disc damage or deformation of stem or seat, which will affect sealing and
operational torque of the valve.
•
Ensure that the disassembled components are kept in a clean place so that there will be no damage to
the components.