Caution
The air vent valve stem cannot be removed from the air vent valve body. Attempting to
remove the valve stem by pulling it upward may damage it and cause burns or other injury
due to malfunction or the discharge of steam or condensate.
1
Air Vent Valve Stem
2
Air Vent Valve Body
3
Exhaust Port
4
Cover
3. Use the following procedure to close the valve and check for leaks:
Using the open-end wrench, close by slowly turning the hexagonal head of the valve stem
clockwise until contact with the valve seat is felt.
Apply a little more pressure to tighten securely.
Note
Using an ordinary open-end wrench (handle length about 160 mm (6
1
/
4
in)), the valve will
close with only a light turn pressure. Tightening with too much force may result in seizure or
damage to the seat.
After tightening, place the mirror close to the front of the exhaust port. If the mirror clouds,
the valve is not fully closed; tighten a bit more.
4. When air enters the piping at start-up, it may accumulate inside the trap and hinder the
flow of condensate (air binding). Air binding may also occur during the normal course
of trap operation, due to the slow accumulation of air inside the trap. The air vent valve
on the top of this trap is to be operated only when air binding has occurred. Follow the
instructions in the earlier part of this section to operate the air vent valve and release the
air accumulated inside the trap. (The air vent valve is to be open only for as long as is
necessary to release the accumulated air. If left open, it is extremely dangerous, so be
sure to close tightly after operation.)
Disassembly/Reassembly of Air Vent Valve
Part Name & No.
During Disassembly
During Reassembly
Air Vent Valve
Unit
Remove with a socket wrench
Consult the table of tightening torques
and tighten to the proper torque
Air Vent Valve
Gasket
Remove the gasket and clean sealing
surfaces
Replace with a new gasket; coat
surfaces with anti-seize
Table of Tightening Torques
Part Name & No.
Torque
N
‧
m
Distance Across Flats
mm
Air Vent Valve Body
100
24
Note
• Coat all threaded portions and valve seat gasket with anti-seize.
• If drawings or other special documentation were supplied for the product, any torque given there
takes precedence over values shown here.
23
