Danfoss Шаровые краны - Manual (Page 3)

33
Safety Note
Prior to assembly and commissioning, the
assembly and start-up instructions must
be read carefully and observed.
Necessary assembly and start-up must
only be performed by qualified, trained,
and authorized personnel.
Please comply with the instructions of the
system manufacturer or system operator.
Storing and handling before
installation
Store the valve in a dry and well-ventilated
room. The end caps on the ends of the
valves are to be removed just before
installation so that no sand or metal
particles etc. enter into the valve.
❶
Installation
① The Danfoss ball valves can be installed
in all positions.
② The ball must be in fully opened
position during installation.
At welding procedure only use
qualified welders. Do not heat up the
valve unnecessarily.
③ If the valve is used as a service valve, we
recommend to close with a safety plug
so that the valve can be left in open
position.
If the valve is used as an end stop valve,
we recommend to close with an end
plate/closing cap until a later expansion
of the system and leave the valve in open
position.
This way it is secured that the seat rings
and the ball are surrounded by water both
lubricating the seat rings and protecting
the surface of the ball in the best possible
way against sediments of sludge, oil, slags
etc.
The ball valve is maintenance free. The
proper function of the valve requires
a proper water quality and a proper
installation.
④ The valve housing is made of mild steel
and as such not corrosion resistant. To
avoid corrosion coming from outside,
the valve will either have to be installed
in dry surroundings, or protected by
watertight insulation or other effective
surface protection.
⑤ Mounting of handle DN 125-150
(reduced bore)
❷ Start up
The valves must be activated slowly
several times after the system has been
rinsed through and filled with water
before the pressure testing is taking place.
this way a good evacuation of the cavity
around the ball is achieved and the sealing
surfaces are lubricated with water.
The seat rings are made of carbon
reinforced teflon and the good friction
qualities are to some extend depending on
the water as lubricating substance.
If the system is not rinsed through,
the sealing surfaces can be damaged
during activation.
❸ Pressure testing of the system
The valve has been pressure tested at the
factory. When pressure testing the finished
pipe system the valve will be pressure
tested once again.
Pressure testing against a closed valve
has to be avoided, if possible. If it is still
necessary to pressure test against a closed
valve, then you have to be aware of the
pressure being built up controlled and
gradually. No pressure peaks are allowed.
Function test
After the pressure testing you must
operate the valve several times to test the
function of the valve and to ensure a water
film on all sealing surfaces.
If the system will not be taken into
operation immediately after pressure
testing, be sure the temperature will
not go below 0 °C. Remaining water
will freeze and the valve may be damaged.
In operation
Safety note
Operation of the ball valves must
only be performed by qualitied,
trained and authorized personnel.
The operator must use suitable
gloves when operating insulated
substations or pipelines with
medium temperatures of more than 130 °C, or
operating uninsulated substations or pipelines
with medium temperatures of more than
60-65 °C.
The ball valve is an ON/OFF valve
and must as such always be in a
complete opened or closed position.
Only during filling or emptying the
system, the valve may be in a partly
open position for a short time.
To ensure the proper function of the valve,
it must be operated frequently, (i.e. 1 to 4
times per annum depending on the water
quality).
To operate the valve build up the torque
and have some patience to allow the
sealing surfaces to slip.
Increase the torque until the ball moves.
Hammering the handle or
other sudden impacts are
strictly forbidden.
Installation Guide Ball valves type JIP
District Energy VI.HA.M5.1S DEN-SMT/SI
ENGLISH