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Disassembly/Reassembly (to reassemble, follow procedures in reverse)
Part & No.
VC3
VC3
Cover Bolt 7
−
Cover 2
○
Cover
◯
Gasket 5
Valve Seat 4
○
−
Valve Seat
−
Gasket 6
Float 3
◯
"O" indicates which models contain which parts
Model
Part & No.
VC2
VC3
Valve Seat 4
Cover Bolt 7
VC4
Valve Seat 4
If drawings or other special documentation were supplied for the product, any torque given there
takes precedence over values shown here.
6. Troubleshooting
If the expected performance is unachievable after installation of the air vent, read chapter 4
again and check the following points to take appropriate corrective measures.
Problem
No air
Air is not reaching the vent because the liquid
discharged or
in the piping is not being displaced by air
discharge is
poor (blocked)
Valve seat is clogged
Inlet or outlet piping is clogged
The operating pressure exceeds the maximum
specified pressure for this product
Water leaks
Build-up on the surface of the valve seat
when valve is
or the valve seat is damaged.
closed*
Float is dirty, coated with a film, or is deformed
Improper installation
Water is inside the float
Valve does not
close, and
Specific gravity of the liquid is not suitable for
liquid spurts
this product (This product is for water systems)
out
* If there is a rapid rise in water level (caused by rapidly opening a shut-off valve, etc.), a small
amount of water may leak with discharged air immediately before the vent closes.
VC4
Disassembly
Clamp the hexagonal part of the
−
◯
vent body in a vice and remove
with a socket wrench
Clamp the hexagonal part of the
○
−
vent body in a vice and use a
wrench to loosen the cover
Remove gasket and clean
◯
◯
sealing surfaces
Push valve seat inwards from
−
−
the outlet side, being careful
not to scratch
Remove with a socket wrench,
being careful not to scratch the
◯
◯
seating surface
Remove gasket and clean
◯
◯
sealing surfaces
Remove, being careful not to
◯
◯
scratch the surface
Tightening Torque and Distance Across Flats
N
•
Cover 2
100
Cover 2
200
15
80
15
Cause
Consult the table of tightening
torques, coat threads with
anti-seize, and tighten to the
proper torque
Replace with a new gasket if
damaged
Using a finger, push into place
from the interior side of the
cover
Consult the table of tightening
torques, coat threads with
anti-seize, and tighten to the
proper torque
Replace with a new gasket if
damaged
Insert, being careful not to
scratch the surface
(lbf
ft)
m
•
(73)
(150)
(11)
(59)
(11)
Correct the inlet piping
(Inner diameter should be
at least 16 mm [
Clean valve seat
Clean piping
Replace the air vent with a model
that has a suitable operating
pressure rating
Clean or replace with new valve
seat
Clean or replace with new float
Correct the installation
Replace with new float
Select a product with suitable
specifications for the operating
conditions (consult TLV)
̶ 8 ̶
Reassembly
mm
(in)
／
(
)
24
15
16
／
46
(1
)
13
16
／
(
)
14
9
16
／
(
)
19
3
4
／
(
)
14
9
16
1 N . m ≈ 10 kg . cm
Remedy
/
5
"])
8
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