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7. Operational Check
A visual inspection can be done to help decide about necessary immediate maintenance or repair
if the air vent is open to atmosphere.
Normal:
Blocked (no discharge): No air is discharged. The air vent is quiet and its surface temperature
Blowing:
Steam Leakage:
Use diagnostic equipment such as TLV Pocket TrapMan if the air vent does not discharge to
atmosphere.
8. Inspection and Maintenance
Operational inspections should be performed at least twice per year, or as called for by trap
operating conditions. Faulty air vents may result in losses due to steam leakage. Follow the
instructions below for disassembly and reassembly when cleaning or repair is necessary.
CAUTION
• Before attempting to open the vent, close the inlet isolation valve of the equipment and
wait until the air vent has cooled to room temperature. Failure to do so may result in
burns or injury.
• LA13L can be maintained without being removed from the pipeline, on the condition that
the surrounding pipes are securely supported. If the pipes are not properly supported,
they may be damaged when torque is applied in the loosening or tightening of the cover.
Such damage could result in steam spraying out and causing serious injury.
• If using a vise when dismantling the air vent, screw a nipple or pipe end into the outlet to
prevent deformation of the threaded connection.
• Be sure to use the proper components and NEVER attempt to modify the product.
Parts Inspection
Part
Gasket
Screen
X-element
Valve seat
Body, Cover
Cover LA13, Size 15 mm (
Cover LA13, Size 20, 25 mm (
Cover LA21
Cover LA13L
Valve Seat LA13L
If drawings or other special documentation were supplied for the product,
any torque given there takes precedence over values shown here.
The sound of flow can be heard while air is discharged. When air
discharge finishes, the valve closes along with slight discharge of steam.
is low.
Live steam continually blows from the outlet and there is a continuous
metallic sound.
Live steam is leaking through the outlet, accompanied by a high-
pitched sound.
• Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
Check for warping or damage (LA13, LA13L only).
Check for clogging or corrosion damage.
Check for rust, scale, oil film, wear or damage.
Check for rust, scale, oil film, wear or damage.
Check inside for rust and scale.
Tightening Torque and Distance Across Flats
Part
/
1
)
2
/
, 1 )
3
4
Procedure
Tightening torque
(lbf ・ ft)
N ・ m
80
(59)
80
(59)
120
(88)
80
(59)
35
(26)
̶ 10 ̶
Distance across flats
(in)
mm
／
27
(1
)
1
16
／
41
(1
)
5
8
／
27
(1
)
1
16
／
32
(1
)
1
4
／
19
(
)
3
4
〜 〜
1 N ・ m
10 kg ・ cm
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