Axel Larsson AL 61-496 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 qualified 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 flow
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 fluid is
harmful, inflammable, toxic, etc., install discharge tubes that lead to a
secure place.
1.2.2. Removal of condensed matter
Steam and gases
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 sufficient 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 sufficient 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.
Liquids