TLV VAS User manual

172-65170MA-06 (VAS) 9 July 2015
Rapid Initial Air Vent
VAS
Copyright © 2015 by TLV CO., LTD.
All rights reserved
ISO 9001/ ISO 14001
Manufacturer
Kakogawa, Japan
is approved by LRQA LTD. to ISO 9001/14001

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Contents
Introduction .......................................................................1
Safety Considerations.......................................................2
Features............................................................................4
Operation ..........................................................................4
Specifications....................................................................5
Configuration.....................................................................5
Installation.........................................................................6
Maintenance......................................................................7
Disassembly/Reassembly.................................................8
Troubleshooting ..............................................................10
Product Warranty ............................................................11
Introduction
Thank you for purchasing the Rapid Initial Air Vent.
This product has been thoroughly inspected before being shipped from the
factory. When the product is delivered, before doing anything else, check the
specifications and external appearance to make sure nothing is out of the
ordinary. Also be sure to read this manual carefully before use and follow the
instructions to be sure of using the product properly.
This Rapid Initial Air Vent is for use on water-bearing pipes, and should
therefore not be used on steam lines.
The Rapid Initial Air Vent operates by rapidly discharging the initial air when
supplying water to piping, then closing upon completion of discharge. During
operation, once it has closed, the air vent remains closed as long as there is
internal pressure. When draining piping, the Rapid Initial Air Vent automatically
opens to introduce air and remove water easily.
The Rapid Initial Air Vent ‘s simple, compact construction, with no hinges or
levers and only one moving part, the float, provides trouble-free operation and
long service life.
If detailed instructions for special order specifications or options not contained
in this manual are required, please contact for full details.
This instruction manual is intended for use with the model(s) listed on the
front cover. It is necessary not only for installation but for subsequent
maintenance, disassembly/reassembly and troubleshooting. Please keep it in
a safe place for future reference.

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Safety Considerations
•Read this section carefully before use and be sure to follow the
instructions.
•Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
•The precautions listed in this manual are designed to ensure safety and
prevent equipment damage and personal injury. For situations that may
occur as a result of erroneous handling, three different types of cautionary
items are used to indicate the degree of urgency and the scale of potential
damage and danger: DANGER, WARNING and CAUTION.
•The three types of cautionary items above are very important for safety: be
sure to observe all of them as they relate to installation, use, maintenance,
and repair. Furthermore, TLV accepts no responsibility for any accidents
or damage occurring as a result of failure to observe these precautions.
Symbols
Indicates a DANGER, WARNING or CAUTION item.
DANGER
Indicates an urgent situation which poses a threat of death or
serious injury
WARNING
Indicates that there is a potential threat of death or serious injury
CAUTION
Indicates that there is a possibility of injury or equipment /
product damage
WARNING
DO NOT use for toxic, flammable or otherwise hazardous
fluids.
This product is an air vent that discharges air from water piping
system. Use only for water and/or air. This product is for intended
use only. Improper use may result in such hazards as damage to
the product or malfunctions that may lead to serious accidents.
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.
CAUTION
Install properly and DO NOT use this product outside the
recommended operating pressure, temperature and other
specification ranges.
Improper use may result in such hazards as damage to the
product or malfunctions that may lead to serious accidents. Local
regulations may restrict the use of this product to below the
conditions quoted.
Safety considerations continued on next page.

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CAUTION
Take measures to prevent people from coming into direct
contact with product outlets.
Failure to do so may result in burns or other injury from the
discharge of fluids.
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.
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 and burns or other injury due to malfunction or the
discharge of fluids.
Do not use excessive force when connecting threaded pipes
to the product.
Over-tightening may cause breakage leading to fluid discharge,
which may cause burns or other injury.
Use only under conditions in which no freeze-up will occur.
Freezing may damage the product, leading to fluid discharge,
which may cause burns or other injury.
Use only under conditions in which no water hammer will
occur.
The impact of water hammer may damage the product, leading to
fluid discharge, which may cause burns or other injury.

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Features
1. The air vent has no hinges or levers: the only moving part is the precision-ground
float, which eliminates concentrated wear and provides long service life.
2. Simple construction with few parts allows for easy maintenance.
3. The air vent is small and light.
Operation
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
1. When water is transported, air inside the piping is
forced into the air vent by the pressure of the flow.
The float inside the air vent is in the lower position,
thus the valve is fully open and allows the air that
enters the air vent and fills the area around the float
to then be discharged.
2. When discharge is completed, as water flows into the
air vent, the rising water level causes the float to rise
and to close the valve.
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 air vent closes.
3. Once it has closed, the air vent remains closed as
long as there is internal pressure.
4. When draining the piping, the air vent automatically
opens to introduce air and remove water more easily
(preventing a vacuum from forming in the piping).
Air
Water

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Specifications
DO NOT use for toxic, flammable or otherwise hazardous fluids.
This product is an air vent that discharges air from water piping system.
Use only for water and/or air. This product is for intended use only.
Improper use may result in such hazards as damage to the product or
malfunctions that may lead to serious accident.
WARNING
Install properly and DO NOT use this product outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the product or
malfunctions which may lead to serious accidents. Local regulations
may restrict the use of this product to below the conditions quoted.
CAUTION
Use only under conditions in which no freeze-up will occur. Freezing
may damage the product, leading to fluid discharge, which may cause
burns or other injury.
CAUTION
Refer to the product nameplate for detailed specifications.
Model
Production Lot No.
X-element Type
Maximum Allowable
Temperature (TMA)*
Maximum Operating
Temperature (TMO)
Nominal Diameter
Maximum Allowable
Pressure*
Maximum Operating
Pressure
Valve No.**
* Maximum allowable pressure (PMA) and maximum allowable temperature (TMA) are
PRESSURE SHELL DESIGN CONDITIONS, NOT OPERATING CONDITIONS.
** Valve No. is displayed for products with options. This item is omitted from the nameplate
when there are no options.
Configuration
No.
Part Name
1
Body
2
Union
3
Cap Nut
4
Valve Seat
5
Valve Seat Holder
6
Float
7
Float Guide
8
Snap Ring
9
Valve Seat Gasket
10
Union Gasket
11
Nameplate

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Installation
DO NOT use for toxic, flammable or otherwise hazardous fluids.
This product is an air vent that discharges air from water piping system.
Use only for water and/or air. This product is for intended use only.
Improper use may result in such hazards as damage to the product or
malfunctions that may lead to serious accident.
WARNING
Install properly and DO NOT use this product outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the product or
malfunctions which may lead to serious accidents. Local regulations
may restrict the use of this product to below the conditions quoted.
CAUTION
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
Do not use excessive force when connecting threaded pipes to the
product. Over-tightening may cause breakage leading to fluid
discharge, which may cause burns or other injury.
CAUTION
Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.
1. Before installation, be sure to remove all protective seals.
2. Before installing the product, open the inlet valve and blow out the piping to
remove any piping scraps, dirt and oil. Close the inlet valve after blowdown.
3. This product must be installed vertically, with the inlet at the bottom and the outlet
at the top, and should be inclined no more than 5° horizontally and front-to-back
(Figure 2).
4. Install the product in a location where air is likely to collect, such as a bend in the
piping.
5. Install the product so that the outlet pipe reaches a drainage vessel or ditch. Make
sure the end of the pipe is above the waterline, so that dirt and water can not be
sucked up by vacuum when the system shuts down (Figure 1).
6. Inlet piping with no horizontal portion is recommended for water/air displacement.
If there is a horizontal portion, make the pipe diameter of the horizontal portion
larger than the vertical portion or make the horizontal portion as short as possible.
7. Make sure the inlet piping diameter is at least as large as the product’s inlet diameter.
8. Installation of an isolation valve just before the product’s main connection is
recommended as it enables maintenance during operation. A full-bore ball valve is
recommended.
9. Make sure to take measures to prevent foreign matter from flowing into the product.
10.This is a rapid initial air vent for quickly venting large amounts of air at startup
only. If air venting is necessary during system operation, install an automatic air
vent as well.
If there is a problem, determine the cause using the “Troubleshooting” section in this manual.
Figure 1
Make sure the end
of the pipe is above
the waterline
Figure 2
Tolerance Angle for
Installation: - 5

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Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
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
Operational Check
A visual inspection of the following items should be done on a daily basis to
determine whether the air vent is operating properly or has failed.
If the air vent should fail, it may cause water leakage or hindrance to water flow.
Normal
:
Air is discharged as it accumulates, with the air vent
closing (with no leakage) when no air is present in the
piping.
B
locked
(Discharge Impossible) :
No air is discharged though air accumulates in the air
vent.
NOTE: Once the air vent closes, it will remain closed until internal pressure
drops to near or below atmospheric pressure. This condition may be
confused with a malfunction (blocked). If air is expected to accumulate
in the piping during operation, use together with an automatic air vent.
Leakage : Water is discharged or leaks through the air vent outlet
during closed position.
Parts Inspection
When parts have been removed, or during periodic inspections, use the following
table to inspect the parts and replace any that are found to be defective.
Procedure
Gaskets: check for warping or scratches
Valve Seat Surface: check for scratches or wear
Float: check for scratches or dents
Float Guide: check for deformation

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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
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
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
Disassembly/Reassembly
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.)
Part
During Disassembly
During Reassembly
Cap Nut
Remove with a wrench
Consult the table of tightening torques
and tighten to the proper torque
Union
Remove, being careful not to scratch
the gasket sealing surface
Make sure there are no pieces of the
old gasket left on the sealing surfaces
and reattach
Union
Gasket
Remove carefully, being careful not to
scratch the sealing surfaces
Replace with a new gasket if damaged;
make sure there are no pieces of the
old gasket left on the sealing surfaces
of the body
Valve Seat/
Valve Seat
Holder
Remove with a socket wrench
Replace with a new valve seat / valve
seat holder if misshapen or damaged
Consult the table of tightening torques
and tighten to the proper torque
Valve Seat
Gasket
Remove if damaged
Replace with a new gasket if damaged
Float
Remove, being careful not to scratch
the polished surface
Insert, being careful not to scratch or
misshape
Snap Ring
Remove with appropriate pliers
Insert securely into the groove
Float Guide
Remove without misshaping
Insert, being careful not to misshape

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Table of Tightening Torques
VAS Size
Inlet / Outlet
mm (in)
Part Name Torque Distance Across Flats
N⋅m
(lbf·ft)
mm
(in)
20 (3/4) / 15 (1/2)
Cap Nut
50
(37)
55
(25/32)
Valve Seat Holder
20
(15)
17
(21/32)
40 (11/2) / 25 (1)
Cap Nut
80
(59)
75
(215/16)
Valve Seat Holder
35
(26)
27
(11/16)
(1 N⋅m ≈10 kg⋅cm)
NOTE: - Coat all threaded portions with anti-seize.
- If drawings or other special documentation were supplied for the product, any torque
given there takes precedence over values shown here.
Exploded View
Cap Nut
Union
Valve Seat Gasket
Valve Seat
(Valve Seat Holder)
Float
Snap Ring
Float Guide
Union Gasket
Body

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Troubleshooting
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
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
When the product fails to operate properly, use the following table to locate and
remedy the cause.
Problem
Cause
Remedy
No initial air is
discharged
(blocked)* or
discharge is
poor
The trapped air cannot displace the
water in the piping
Correct the inlet piping
The valve seat is clogged with dirt or
foreign matter
Clean the valve seat
The inlet or outlet piping is clogged
Clean the piping
Water leaks
when the vent is
closed
There is a build-up of rust or scale on
the valve seat or the valve seat is
damaged
Clean the valve seat or replace with a
new valve seat
The float is misshapen, dirty or has a
film build-up
Clean the float or replace with a
new float
The installation angle of inclination is
incorrect
Correct the installation
The vent does
not close, and
water is blowing
The float is damaged or filled with
water
Replace with a new float
The specific gravity of the liquid is
outside the specifications for this
product
(This product is for water system)
Select a product with suitable
specifications for the operating
conditions
* NOTE: Once the air vent closes, it will remain closed until internal pressure drops to near or
below atmospheric pressure. This condition may be confused with a malfunction
(blocked). If air is expected to accumulate in the piping during operation, use
together with an automatic air vent.

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Product Warranty
1. Warranty Period
One year following product delivery.
2. Warranty Coverage
TLV CO., LTD. warrants this product to the original purchaser to be free
from defective materials and workmanship. Under this warranty, the
product will be repaired or replaced at our option, without charge for parts
or labor.
3. This product warranty will not apply to cosmetic defects, nor to any
product whose exterior has been damaged or defaced; nor does it apply in
the following cases:
1) Malfunctions due to improper installation, use, handling, etc., by other
than TLV CO., LTD. authorized service representatives.
2) Malfunctions due to dirt, scale, rust, etc.
3) Malfunctions due to improper disassembly and reassembly, or
inadequate inspection and maintenance by other than TLV CO., LTD.
authorized service representatives.
4) Malfunctions due to disasters or forces of nature.
5) Accidents or malfunctions due to any other cause beyond the control of
TLV CO., LTD.
4. Under no circumstances will TLV CO., LTD. be liable for consequential
economic loss damage or consequential damage to property.
* * * * * * *
For Service or Technical Assistance:
Contact your representative or your regional office.
Manufacturer
CO., LTD.
881 Nagasuna, Noguchi
Kakogawa, Hyogo 675-8511 JAPAN
Tel: 81-(0)79 - 427 - 1800