© Danfoss | DCS (MWA) | 2015.05
DKRCI.PI.KM1.H2.ML / 520H8212
3
ENGLISH
Installation
Refrigerants
Applicable to HCFC, HFC, R717 (Ammonia),
R744 (CO
2
), Propane, Butane, Iso-Butane
and Ethane.
The valve is only recommended for use
in closed circuits. For further information
please contact Danfoss.
Temperature range
–60/+150°C (–76/+302°F)
Max. working pressure
The valves are designed for a max. working
pressure of 52 bar g (754 psi g).
Installation
The valve must be installed with the
spindle vertically upwards or in horizontal
position (fig. 1). Valves should be opened
by hand. The valve is designed to withstand
a high internal pressure. However, the
piping system should be designed to avoid
liquid traps and reduce the risk of hydraulic
pressure caused by thermal expansion.
Please ensure that the valve is protected
from pressure transients like “liquid
hammer” in the system.
Recommended flow direction
Direct the flow towards the cone as
indicated by the arrow placed on the valve
housing (fig. 2). The force used to open and
close the valve must not exceed the force
of an ordinary handwheel.
Welding
To prevent damage to the sealing parts
in the packing gland and between the
valve body and bonnet, as well as the
teflon gasket in the valve seat, the bonnet
should be removed before welding and
protect it from dirt and moisture (fig. 3).
Only materials and welding methods,
compatible with the valve housing
material, must be welded to the valve
housing. The valve should be cleaned
internally to remove welding debris on
completion of welding and before the
valve is reassembled.
Avoid welding debris and dirt in the
threads of the housing and the bonnet.
Removing the bonnet can be omitted
provided that:
The temperature in the area between the
valve body and bonnet during welding
does not 150°C/+302°F. This
temperature depends on the welding
method as well as on any cooling of the
valve body during the welding itself.
(Cooling can be ensured by, for example,
wrapping a wet cloth around the valve
body.) Make sure that no dirt, welding
debris etc. get into the valve during the
welding procedure.
Be careful not to damage the teflon cone
ring.
The valve housing must be free from
stresses (external loads) after installation.
Do not mount REG-SA/SB SS valves in
systems where the outlet side of the valve
is open to atmosphere. The outlet side of
the valve must always be connected to the
system or properly capped off, for example
with a welded-on end plate.
Assembly
Remove welding debris and any dirt from
pipes and valve body before assembly.
Check that the cone has been fully screwed
back towards the bonnet before it is
repositioned in the valve body
(REG-SA/SB SS DN 15-40) (fig. 4).
Tightening
Tighten the bonnet with a torque wrench,
to the values listed in the table (fig. 4).
Colours and identification
The REG-SA/SB SS valves are painted
with a red primer in the factory. Precise
identification of the valve is made via the
yellow ID ring at the top of the bonnet, as
well as by the stamping on the valve body.
The external surface of the valve housing
must be protected against corrosion
with a suitable protective coating after
installation and assembly.
Protection of the ID ring when repainting
the valve is recommended.
Maintenance
Packing gland
When performing service and
maintenance, replace the complete
packing gland only, which is available as a
spare part. As a general rule, the packing
gland must not be removed if there is
internal pressure in the valve. However, if
the following precautionary measures are
taken, the packing gland can be removed
with the valve still under pressure:
Backseating (fig. 5)
To backseat the valve, turn the spindle
counter-clockwise until the valve is fully
open.
Pressure equalization (fig. 6)
In some cases, pressure forms behind the
packing gland. Hence a handwheel or
similar should be fastened on top of the
spindle while the pressure is equalized.
The pressure can be equalized by slowly
screwing out the gland.
Removal of packing gland (fig. 7)
The packing gland can now be removed.
Dismantling the valve
Do not remove the bonnet while the valve
is still under pressure.
- Check that the O-ring (fig. 9, pos. A) has
not been damaged.
- Check that the spindle is free of scratches
and impact marks.
- If the teflon cone ring has been
damaged, the whole cone assembly
must be replaced.
- DN 15-40: Unscrew the adapter (fig. 11,
pos. A) to be able to change the cone.
Replacement of the cone (fig. 10)
Unscrew the cone screw (pos. B) with an
Allen key. (An Allen key is included in the
Danfoss Industrial Refrigeration gasket set).
REG-SA/SB SS 15-40 ...................... 2.0 mm A/F
Remove the balls (pos. C).
Number of balls in fig. 10, pos. C:
REG-SA/SB SS 15-20 ................................ 10 pcs.
REG-SA/SB SS 25-40 ................................ 14 pcs.
The cone can now be removed. Place the
new cone on the spindle and remember to
place the disk spring (pos. D) between the
spindle and the cone. Compress the disk
spring and replace the balls (pos. C).
Refit the cone screw in again using Loctite
No. 648. to ensure that the screw is
properly fastened.
Assembly
Remove any dirt from the body before the
valve is assembled. Check that the cone
has been screwed back towards the bonnet
before it is replaced in the valve body (fig. 4).
Note:
For REG-SA/SB SS sizes DN 15-40 it is
important to ensure that the lower
and upper part of the insert is tightly
screwed together (fig. 12) and that this
screw connection is kept tight during
repositioning of the cone in the housing.
Tightening
Tighten the bonnet with a torque wrench,
to the values indicated in the table (fig. 4).
Tighten the packing gland with a torque
wrench, to the values indicated in the table
(fig. 8).
Use only original Danfoss parts, including
packing glands, O-rings and gaskets for
replacement. Materials of new parts are
certified for the relevant refrigerant.
In cases of doubt, please contact your local
Danfoss sales office.
