172-65427MA-05 (JH7RH-P/JH7RHT-P) 29 Sep 2016
17
Operating the Air Vent Valve
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.
1. Locate the air vent valve exhaust port before operating the air vent valve, in order
to avoid being burned by hot air or steam blowing from the air vent valve. The
exhaust port is a 2 mm (
1
/
16
in) diameter hole on the side of the air vent valve
body.
DO NOT
under any circumstances allow any unprotected part of your body to
come in front of this hole.
2. Never leave an open air vent valve unattended.
Tools required: 1) open-end wrench (distance across flats 17mm (
21
/
32
in))
2)
long-handled mirror to check for steam leakage after closing
the exhaust port (leaking steam cloud the mirror)
•
Using the open-end wrench, slowly turn the hexagonal head of the valve stem
counterclockwise.
•
Watch the exhaust port to determine the condition of the fluid discharged.
General guidelines:
Cloudy-water droplets and mist spraying out, indicating
that air and condensate are being discharged
Clear---indicating that steam is being discharged; the
valve port may now be closed
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.
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 (6¼
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
CAUTION
Air Vent Valve Stem
Air Vent Valve Body
Exhaust Port
Cover
17 mm
(
21
/
32
in)
