172-65694MA-01 (BD800) 25 Jul 2018
10
Disassembly/Reassembly
NEVER apply direct heat to the float. The float may explode due to
increased internal pressure, causing accidents leading to serious injury
or damage to property and equipment.
WARNING
Use hoisting equipment for heavy objects (weighing approximately
20 kg (44 lb) or more). Failure to do so may result in back strain or other
injury if the object should fall.
CAUTION
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble. (Installation, inspection, maintenance, repairs, disassembly,
adjustment and valve opening/closing should be carried out only by trained
maintenance personnel.)
Disassembly/Reassembly of the Body/Bonnet Section
Part
During Disassembly
During Reassembly
Spanner Cap
Unscrew and remove from the bonnet Screw onto the bonnet
Bonnet Nut
Remove with a socket wrench
Consult the table of tightening torques
and tighten to the proper torque
Bonnet
Pull up and remove
Align the embossed lettering on the
bonnet and body and reattach
NOTE: When assembling the bonnet to the body, tighten the bonnet nuts, making sure that
the valve stem is seated on the valve seat with no built-up of rust and scale.
When tightening the bonnet nuts, tighten all of them evenly and gradually to the proper
torque to avoid uneven tightening. When the secondary side of the product is open to
the atmosphere, visually check whether fluid is leaking on the secondary side.
Contact TLV in the event leakage does not stop.
Disassembly/Reassembly of the Bonnet Section
Part
During Disassembly
During Reassembly
Gland Holder
Remove with a socket wrench
Consult the table of tightening torques
and tighten to the proper torque
Valve Stem
Replace only when necessary;
Unscrew from the bonnet
Screw into the bottom part of the
bonnet
Gland Packing Replace only when necessary;
see the “Replacing the Gland
Packing” section for replacement
Reassemble as shown in the
“Replacing the Gland Packing”
section
Disassembly/Reassembly of the Body Section
Part
During Disassembly
During Reassembly
Bonnet
Gasket
Remove the gasket and clean
sealing surfaces
Replace with a new gasket
Valve Seat
Replace with a socket wrench only
when necessary
Consult the table of tightening torques
and tighten to the proper torque
Valve Seat
Gasket
Remove the gasket and clean
sealing surfaces
Replace with a new gasket; coat
surfaces with anti-seize
