Flowserve BX2001 Durco - Manual (Page 8)

DURCO BX2001 USER INSTRUCTIONS ENGLISH 9-13
8
DANGER – Immediate hazards which WILL result in severe
personal injury or death.
1. Refer to Safety Precautions Instructions on page 5 of this
manual.
2. Open the valve and bleed the line.
3. Close the valve.
4. Remove the valve from the line.
SECTION III
VALVE REMOVAL
SECTION IV
SEAT REPLACEMENT
DISASSEMBLY
1. For repairs that require seat replacement only, it is not
necessary to remove manual operators.
2. Place the valve seat side up on a work table.
3. For valves that have retainer ring fasteners, remove the
fasteners and lift the retainer ring and seat package out
of the valve body.
4. For metal seated valves that use a wire retainer locking
ring, cut the wire where it is attached to the valve body.
Use pliers to pull the wire while also rotating the retainer
ring until the wire is pulled free. Lift the retainer ring and
seat out of the valve body.
5. For soft seated valves that use an O-ring retainer locking
ring, insert the flat blade of a screwdriver into the gap
between the back of the retainer ring and the valve body.
Twist the blade to pry the retainer ring out of the valve
body, then remove the seat package.
cLEAn up AnD prEpArAtIon
1. Remove the PFA seat and seat energizer from the seat
ring. Remove any gasket material from the seat ring and
clean thoroughly.
2. Remove any seat gasket material from the retainer ring
and the seat pocket of the valve body. Clean all surfaces
thoroughly. Discard retainer ring fasteners, wire or
O-ring retainer lock rings.
3. Carefully clean and inspect the sealing surface of the
valve disc. Small scratches, scale or minor corrosion can
be removed by polishing using 600 grit or finer emery
paper. DO NOT SAND OR BEAD BLAST DISC.
4. Metal seated valves use hard surface plating on the
valve disc to improve seal life. If the plating is damaged,
scratched or heavily worn, the disc should be replaced.
5. Under no circumstances should worn, corroded or
scratched valve discs be repaired by welding or
re-machining.
pFA SEAt pAckAgE prE-ASSEMBLY
1. Spread open the seat and insert the seat energizer
into the seat. Press the energizer firmly into the inside
of the seat.
2. Spread open the seat again and slip it over the seat ring,
working it around the circumference of the ring until the
seat ring is totally encapsulated by the seat.
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