Spirax Sarco AVM7 User manual

IM-P123-23 CMGT Issue 6 1
1. Safety information
2. General product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. Spare parts
© Copyright 2019
Printed in GB
1231850/7
AVM7
Stainless Steel Thermostatic Air Vent
Installation and Maintenance Instructions
IM-P123-23
CMGT Issue 7

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Safe operation of this product can only be guaranteed if it is properly installed, commissioned,
used and maintained by qualified personnel (see Section 1.11) in compliance with the operating
instructions. General installation and safety instructions for pipeline and plant construction, as
well as the proper use of tools and safety equipment must also be complied with.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and Technical Information
Sheet, check that the product is suitable for the intended use/application. The product listed
below complies with the requirements of the Pressure Equipment Directive (PED) and carries
the mark when so required. The product falls within the following Pressure Equipment
Directive (PED) categories:
Product Group 2
Gases
Group 2
Liquids
AVM7 SEP SEP
i) The product has been specifically designed for use on steam, air or water/condensate which
are in Group 2 of the above mentioned Pressure Equipment Directive (PED).
ii) Check material suitability, pressure and temperature and their maximum and minimum values.
If the maximum operating limits of the product are lower than those of the system in which it
is being fitted, or if malfunction of the product could result in a dangerous overpressure or
overtemperature occurrence, ensure a safety device is included in the system to prevent such
over-limit situations.
iii) Determine the correct installation situation and direction of fluid flow.
iv) Spirax Sarco products are not intended to withstand external stresses that may be induced
by any system to which they are fitted. It is the responsibility of the installer to consider these
stresses and take adequate precautions to minimise them.
v) Remove protective covers from all connections and the protective film from all name-plates,
where appropriate, before installation on steam or other high temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded) before attempting
to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some previous time.
Consider: flammable materials, substances hazardous to health, extremes of temperature.
1. Safety information

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1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases, extremes of
temperature, hot surfaces, fire hazard (e.g. during welding), excessive noise, moving machinery.
1.6 The system
Consider the effect on the complete system of the work proposed. Will any proposed action (e.g.
closing isolation valves, electrical isolation) put any other part of the system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering ineffective of controls
or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider double
isolation (double block and bleed) and the locking or labelling of closed valves. Do not assume
that the system has depressurised even when the pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
If parts made from FKM have been subjected to a temperature above 250 °C (482 °F), it may have
decomposed and formed flourine compounds, fluro hydrocarbons and fluro olefins. When subjected
to temperatures above 500 °C (932 °F) parts made from FKM may ignite. Combustion residues are very
corrosive and acidic, so acid-resistant gloves should be worn when handling, and calcium oxide/hydroxide
can be used to neutralise it.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and/or consumables available. Use only
genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and/or others in the vicinity require any protective clothing to protect against
the hazards of, for example, chemicals, high/low temperature, radiation, noise, falling objects, and
dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the product according
to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with. Where there is no such
system, it is recommended that a responsible person should know what work is going on and, where
necessary, arrange to have an assistant whose primary responsibility is safety.
Post 'warning notices' if necessary.
1.12 Handling
Manual handling of large and/or heavy products may present a risk of injury. Lifting, pushing,
pulling, carrying or supporting a load by bodily force can cause injury particularly to the back.
You are advised to assess the risks taking into account the task, the individual, the load and the
working environment and use the appropriate handling method depending on the circumstances
of the work being done.

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1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the maximum permitted
operating conditions the surface temperature of some products may reach temperatures in excess
of 300 °C (572 °F).
Many products are not self-draining. Take due care when dismantling or removing the product from
an installation (refer to 'Maintenance instructions').
1.14 Freezing
Provision must be made to protect products which are not self-draining against frost damage in
environments where they may be exposed to temperatures below freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this product is recyclable
and no ecological hazard is anticipated with its disposal providing due care is taken, except:
FKM:
-Can be landfilled, when in compliance with National and Local regulations (waste code no.57502 -
rubber waste; Germany).
-Can be incinerated when in compliance with National and Local regulations.
-Is insoluble in water.
-Is soluble in aromatic hydrocarbons.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and Environment Law, when
returning products to Spirax Sarco they must provide information on any hazards and the precautions
to be taken due to contamination residues or mechanical damage which may present a health,
safety or environmental risk. This information must be provided in writing including Health and
Safety data sheets relating to any substances identified as hazardous or potentially hazardous.

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2.1 General description
The AVM7 is a maintainable thermostatic air vent designed to remove air and other non-condensible gases
from clean steam systems. Manufactured in 316L stainless steel with minimal crevices, and a typical internal
surface finish of 1.6 - 3.2 µm Ra the AVM7 operates close to steam temperature. The product is individually
packaged within an 'ISO CLASS 7' clean environment with protective end caps and sealed in a protective
plastic bag.
Standards
- The AVM7 has been designed and built in general accordance with ASME BPE.
- The unit also complies with the requirements of the Pressure Equipment Directive (PED).
The seal part is compliant with:
- FDA CFR Title 21. Paragraph 177. 2600.
- USP Class VI Biological Reactivity Cytotoxicity Testing In-Vivo <88> extracted at 121 °C for 1 hour.
- ADI Free (Animal Derived Ingredients) for materials used, manufacturing processes involved in producing
the part.
Certification
This product is available with the following certification:
- EN 10204 3.1 material certificates (pressure containing parts)
- EN 10204 3.1 material certificates (wetted parts, including element fill) subject to additional cost.
- Typical Internal surface finish certificates.
- Specific internal surface finish certificates available at point of order request, and may be subject to
additional cost.
- Certificate of compliance for FDA, USP and ADI free.
- TSE/BSE Free Statement.
- Certificate of compliance EC1935:2004 Food Contact Materials.
- Declaration of conformity BS EN ISO 14644-1:2015 Class 7 Clean Room.
Note: All certification/inspection requirements must be stated at the time of order placement, and may be
subject to additional cost.
Note: for further product data see Technical Information Sheet TI-P123-22.
2. General product information

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Fig. 1 AVM7
2.2 Sizes and pipe connections
¼", ½", ¾" and 1" screwed BSP or NPT.
½", ¾" and 1" O/D x 16 swg (0.065") wall thickness tube butt weld.
½", ¾" and 1" sanitary clamp compatible hygienic connection.
DIN 11850 (Series 1) tube butt weld ends
12 mm O/D x 1.0 mm wall thickness tube butt weld (DN10-D)
18 mm O/D x 1.0 mm wall thickness tube butt weld (DN15-D)
ISO 1127 (Series 1) tube butt weld ends
13.5 mm O/D x 1.6 mm wall thickness tube butt weld (DN8-I)
17.2 mm O/D x 1.6 mm wall thickness tube butt weld (DN10-I)
21.3 mm O/D x 1.6 mm wall thickness tube butt weld (DN15-I)
Note: On request other connection options are available at extra cost. Please note that seat end spares for
specially requested connections will require a minimum order quantity - Please consult Spirax Sarco for
further information.

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2.3 Pressure/temperature limits
Pressure bar g
Temperature °C
01234567
100
0
50
100
150
170
200
300
0 20 40 60 80 100
Temperature °F
Pressure psi g
Steam saturation curve
The product should not be used in this region as damage to the internals may occur
Body design conditions
PMA Maximum allowable pressure 7 bar g @ 170 °C (101.5 psi g @ 338 °F)
TMA Maximum allowable temperature 170 °C @ 7 bar g (338 °F @ 101.5 psi g)
Minimum allowable temperature -10 °C (14 °F)
PMO Maximum operating pressure for
saturated steam service 7 bar g (101.5 psi g)
TMO Maximum operating temperature 170 °C (338 °F)
Minimum operating temperature 0°C (32 °F)
Designed for a maximum cold hydraulic test pressure 10.7 bar g (155.2 psi g)

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Note: Before actioning any installation observe the 'Safety information' in Section 1.
Referring to the Installation and Maintenance Instructions, name-plate and Technical Information Sheet,
check that the product is suitable for the intended installation:
3.1 Check materials, pressure and temperature and their maximum values. If the maximum operating limit
of the product is lower than that of the system in which it is being fitted, ensure that a safety device
is included in the system to prevent overpressurisation.
3.2 Determine the correct installation situation and the direction of fluid flow.
3.3 Remove protective covers from all connections and the protective film from all name-plates, where
appropriate, before installation on steam or other high temperature applications.
3.4 The product is designed for installation in vertical lines with the flow upwards to ensure self-draining
operation. Do not expose the element to superheat conditions since over expansion may result. Suitable
isolation valves must be installed to allow for safe maintenance/replacement. Open isolation valves
slowly until normal operating conditions are achieved. Check for leaks.
3.5 If the trap is to be subjected to a hydraulic test at the full design pressure, before conducting the test,
it is preferable to remove the internals to minimize the risk of damage.
Caution: In order to prevent undue stresses on the pipeline and air vent, ensure adequate provision
is made for thermal expansion.
Note: The body and element must be handled carefully to ensure that surfaces are not damaged. If the trap
is to discharge to atmosphere ensure it is to a safe place, the discharging fluid may be at a temperature of
100 °C (212 °F).
After installation or maintenance ensure that the system is fully functional. Carry out tests on any alarms
or protective devices.
3. Installation
4. Commissioning

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The operating element is a capsule containing a small quantity of a special liquid with a boiling point below
that of water. In the cold conditions that exist at start-up, the capsule is relaxed. The valve is off its seat and
is wide open, allowing unrestricted removal of air.
As air passes through the product, heat is transferred to the liquid in the capsule. The fill liquid boils before
steam reaches the trap. The vapour pressure within the capsule causes it to expand and the unit shuts.
Note: Before actioning any maintenance program observe the 'Safety information' in Section 1.
6.1 General information
Before undertaking any maintenance on the product it must be isolated from the supply line and return line
and any pressure allowed to safely normalise to atmosphere. The product should then be allowed to cool.
When reassembling, ensure that all joint faces are clean. Always ensure the correct tools, safety procedures
and protective equipment are used at all times.
6.2 How to fit new internals:
- Remove nuts and bolts.
- The end connection with internal seat, gasket and capsule assembly can then be removed for cleaning
or replacement. Ensure that the capsule on reassembly is fitted in the correct position
(see Figure 2).
- Reassemble using a new gasket and with the valve head in position to close onto the seat orifice.
- Replace nuts and bolts and tighten them to the recommended torque (see Table 1) and put back
into service.
- Open isolation valves slowly until normal operating conditions are achieved.
- Check for leaks.
Table 1 Recommended tightening torques
Item Part or mm N m (lbf ft)
5Nuts and bolts 8 A/F M5 3 - 4 (2.5 - 3.0)
6. Maintenance
5. Operation

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Available spares are shown in solid outline. Parts drawn in a grey line are not available as spares.
Available spares
Element assembly 2
'O' ring (packet of 3) 3
How to order spares
Always order spares by using the description given in the column headed 'Available spares' and state the
size, type and end connection of the unit.
Example: 1 - Element assembly for a Spirax Sarco ½" AVM7 stainless steel thermostatic air vent having
screwed NPT connections.
3
('O' ring)
2
5
5
Fig. 2
7. Spare parts

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