Danfoss LD Installation Manual page 4

Installation Guide
ENGLISH
safety note
Prior to assembly and commissioning, the
installation guide must be read carefully
and observed.
Installation and start-up must be
performed by qualified, trained and
authorized personnel only.
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 only just before
installation so that no sand or metal
particles etc. enter into the valve.
Installation ❶ ❷ ❸ ❹
The Danfoss ball valves can be installed
any position. ❶
Welding must be done by qualified
welders only. Do not heat up the valve
unnecessarily, as it may damage the seals.
The ball must be in fully opened position
during installation. ❷
If the valve is used as a service valve, we
recommend blinding the valve with a
safety plug, and leave the valve in open
position. If the valve is used as an end stop
valve, we recommend blinding the valve
with an end plate or closing cap until later
extension of the system, and leaving the
valve in open position. ❸
In 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
DH-SMT/PL
LD Ball Valves
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, shielded by watertight
insulation or another effective surface
protection. ❹
Mounting of handle Dn 125 - 150
(reduced bore) ❺
start up ❻
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. In
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 PTFE 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.
Pressure testing of the system ❼
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 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 ❽
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, the valve must be protected
against frost. Otherwise the remaining
water will freeze and the valve may be
damaged.
VI.KD.B1.3D
In operation ❾ ❿
Operation of the ball valves must only
be performed by qualified, trained and
authorized personnel.
The operator must wear
suitable gloves when operating
insulated substations or
pipelines with medium temperatures of
more than 130°, or when 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. ❾
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 releases.
Hammering the handle or other sudden
impacts are strictly forbidden.
Open and close the valve slowly to prevent
water hammer ❿.
Danfoss Heating