Axel Larsson AL 61-496 User manual

Ref. 3.205B_UK - 06/2007. www.axel-larsson.se
MANUAL
Safety valve AL 61-496
1.1. Preliminary advice
1.1.1. General instructions
Safety valves are high-responsibility accessories,which are manufactured
with extreme precision. Incorrect handling can affect the hermetic
properties of the seal.
1.1.2. Cleaning
Ensure that the valve is free from foreign bodies. Clean the tubes and
connections thoroughly before assembly.
1.1.3. Paint
Keep all moving parts, connections and/or discharge areas free of paint.
1.1.4.Transportation
Remove protective covers and anchoring clamps from the lever when
assembling.
1.1.5 Storage conditions
Temperature should be between 5 and 25ºC, and relative humidity less
than 75%.After 6 months, check these values before installing.
1.2 Installation
Installation must be carried out by a qualied technician.
1.2.1 General advice
Install as close as possible to the system to be protected.
The vertical connection tube must be straight and short, and the ow
section must have at least the same diameter as the valve inlet.
Avoid transmitting inadmissible static, dynamic or thermal forces from
the inlets and outlets to the valve.Avoid tension.
Transport must be in the direction of the arrow on the body.
Do not install any sealing devices prior to the valve.
In the case of steam, install a detour before the valve inlet in order to
remove the air from the installation when it is turned on. If the uid is
harmful, inammable, toxic, etc., install discharge tubes that lead to a
secure place.
1.2.2. Removal of condensed matter
Steam and gases Liquids
1.2.3. Insulation
The valve is left uncovered, so that the spring does not heat up.
1.2.4. Ducts
1.2.4.1. Inlet ducts:
These should be as short as possible, with pressure drops of less than
3% of release pressure.
1.2.4.2. Outlet ducts:
The tube must not rest on the valve. It must be self-draining and the
reaction force to discharge should be taken into consideration.
The tube should be as short as possible, with sufcient diameter to
limit a pressure drop through said tube to a maximum level of 10% of
the release pressure.
The diameter must never be less than the diameter of the valve.
Discharge tubes should be of a sufcient size to ensure that inherent
or generated counter-pressure is no greater than 15% of the release
pressure.
A silencer should be installed where discharge is noisy.

Ref. 3.205B_UK - 06/2007. www.axel-larsson.se
MANUAL
Safety valve AL 61-496
1.2.6. Examples of assembly combinations
1.3. Initiation, characterisation and
checking
1.3.1 Initiation
To prevent unnecessary releases,we recommend that working pressure
be at least 5% lower than the pressure at which the valve closes.
When initiating, prompt a manual discharge of 75 - 80% of release
pressure. This will result in the tubes and the valve itself being swept
out. Repeat the operation at regular intervals.
1.3.2. Characterisation
Every safety valve is assembled and checked in our workshop.They are
methodically adjusted in line with release pressure, sealed and then
certied before being despatched, all in accordance with the conditions
set out in our ISO-9001 quality control manual.
Release pressure p, the uid (L = liquid, S = steam, G = gas), discharge
coefcient ad, and the minimum interior diameter of nozzle d0are
marked directly on the body or characteristics plate.
The internal identication number and the CE stamp with the register
of the certifying entity are also visible on the plate or marked on the
body.
Other specications, such as the DIN material standard, PN, ow
direction arrow, DN, batch numbers and control numbers are stamped
either in direct or inverse relief, while other necessary information is
marked mechanically on the clamp or the body of the valve.
Each and every one of the components that go into our valves is
marked with the DIN material regulation and the batch number, by
way of internal register.Also present is the notch that identies quality
control.All of these marks are unequivocal proof of the authenticity of
the components.
Should the valves be checked by accredited bodies, the latter shall
make their own distinctive mark and place their identication number
on the body or pressure box.
1.3.3. Checking
Check that the valve is working correctly, and that release pressure,
total discharge and sealing pressure are as they should be.
Checking frequency will depend on the following: characteristics of
the uid, corrosion, residues, viscosity, etc., as well as on discharge
frequency, and on environmental conditions, climate, pollution, etc.We
suggest that you carry out a preventive maintenance programme in
accordance with current legislation.
1.4 Repairs
Disassemble the valve from the installation when pressure and
temperature conditions are suitable.Take no unnecessary risks!
If using hones, rectiers, test benches, etc., we recommend that you
adjust or delay the release pressure, that maintenance or repairs be
carried out in our workshops with guaranteed original spare parts, or
failing that, on-site by an authorised technician.
Clean all valves before sending and indicate if they have been used with
dangerous liquids. Help us to prevent accidents!
1.2.6. Examples of installations
Telephone [phone] •[email protected] •www.axel-larsson.se
STOCKHOLM GÖTEBORG MOTALA KARLSTAD FALUN SKELLEFTEÅ
Design and specications subject to change without prior notice.
Head Ofce: Truckvägen 12, P.O. Box 805, SE-194 28 Upplands Väsby (Stockholm), Sweden.