SVA,REG6-10.pdf
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Instructions
SVA / REG 6-10
Installation
Fig. 1
Fig. 2a
Fig. 2b
Fig. 3
Nm LB-feet
Max.
10
7.5
Fig. 4a
Fig. 4b
Fig. 5a
Fig. 5b
Fig. 5c
© Danfoss A/S (RC-CMS/MWA), 10-2005
DKRCI.PI.KC0.A2.02 / 520H0748
1
Maintenance
Fig. 6
Fig. 7
Fig. 8
Nm LB-feet
30
22
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
2
DKRCI.PI.KC0.A2.02 / 520H0748
© Danfoss A/S (RC-CMS/MWA), 10-2005
The valve housing must be free from stress-
es (external loads) after installation.
- Check that the spindle is free of scratch-
es and impact marks.
- If the teflon cone ring has been dam-
aged, the whole cone assembly must be
replaced.
ENGLISH
Installation
SVA/REG valves must not be mounted 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.
Refrigerants
Applicable to all common non-flammable
refrigerants, including R717, H
2
S and non-
corrosive gases/liquids dependent on seal-
ing material compatability.
Flammable hydrocarbons are not recom-
mended. The valve is only recommended
for use in closed circuits. For further infor-
mation please contact Danfoss.
Replacement of the cone (fig. 13)
Unscrew the cone screw (pos. D) with an
Allen key.
SVA/REG 6-10
2.0 mm A/F
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 re-
placed in the valve body (fig. 5).
(An Allen key is included in the Danfoss In-
dustrial Refrigeration gasket set).
Remove the balls (pos. E).
Temperature range
SVA: –50/+150°C (–58/+302°F)
REG: –50/+150°C (–58/+302°F)
Number of balls in fig. 13, pos. E:
SVA/REG 6-10 ................................................6 pcs.
Tightening
Tighten the bonnet with a torque wrench,
to the values indicated in the table (fig. 5).
The cone can then be removed. Place the
new cone on the spindle and replace the
balls. Refit the cone screw in again using
Loctite No. 648. to ensure that the screw is
properly fastened.
Pressure range
The valves are designed for a max. working
pressure of 40 bar g (580 psi g).
Colours and identification
The SVA valves are painted with a red oxide
primer in the factory and the REG valves
with a green oxide primer. Precise identifi-
cation of the valve is made via the 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 pre-
vented against corrosion with a suitable
protective coating after installation and
assembly.
Installation
The valve must be installed with the spindle
vertically upwards or in horizontal position
(fig. 1). Valves should be opened by hand
(fig. 3) according to the guidelines in the
datasheet. The valve is designed to with-
stand 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. It
must be ensured that the valve is protected
from pressure transients like “liquid ham-
mer” in the system.
Assembly
Remove any dirt from the body before the
valve is assembled. Check that the cone has
been screwed back towards the bonnet be-
fore it is replaced in the valve body (fig. 5).
Tightening
Tighten the bonnet with a torque wrench,
to the values indicated in the table (fig. 5).
Tighten the packing gland with a torque
wrench, to the values indicated in the table
(fig. 11).
Protection of the ID ring when repainting
the valve is recommended.
Maintenance
Recommended flow direction
Direct the flow towards the cone as indi-
cated 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.
Use only original Danfoss parts, including
packing glands, O-rings and gaskets for re-
placement. Materials of new parts are certi-
fied for the relevant refrigerant.
Packing gland
When performing service and maintenance,
replace the complete packing gland only,
which is available as a spare part. As a gen-
eral rule, the packing gland must not be
removed if there is internal pressure in the
valve. However, if the following precaution-
ary measures are taken, the packing gland
can be removed with the valve still under
pressure:
In cases of doubt, please contact Danfoss.
Danfoss accepts no responsibility for errors
and omissions. Danfoss Industrial Refrigera-
tion reserves the right to make changes to
products and specifications without prior
notice.
Welding
The bonnet should be removed before
welding (fig. 4) to prevent damage to the
O-rings in the packing gland and between
the valve body and bonnet, as well as the
teflon gasket in the valve seat. Only materi-
als 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.
Backseating (fig. 6)
To backseat the valve, turn the spindle
counter-clockwise until the valve is fully
open.
Pressure equalization (fig. 7)
In some cases, pressure forms behind the
packing gland. Hence a handwheel or simi-
lar should be fastened on top of the spindle
while the pressure is equalized. The pres-
sure can be equalized by slowly screwing
out the gland.
Avoid welding debris and dirt in the threads
of the housing and the bonnet.
Removing the bonnet can be omitted pro-
vided that:
The temperature in the area between the
valve body and bonnet during welding
does not exceed +150°C/+302°F. This tem-
perature 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.
Removal of packing gland (fig. 8)
Cap and packing gland can now be re-
moved.
Dismantling the valve
Do not remove the bonnet while the valve
is still under pressure.
- Check that the O-ring (Fig. 12, pos. A) has
not been damaged.
Be careful not to damage the teflon cone
ring.
© Danfoss A/S (RC-CMS/MWA), 10-2005
DKRCI.PI.KC0.A2.02 / 520H0748
3
DECLARATION OF CONFORMITY
The Pressure Equipment Directive 97/23/EC
Name and Address of Manufacturer within the European Community
Danfoss Industrial Refrigeration A/S
Stormosevej 10
PO Box 60
DK-8361 Hasselager
Denmark
Declaration
We hereby declare that below-mentioned equipment are Classified for Fluid Group I (all refrigerants (toxic, non-toxic, flammable and
non-flammable)), and that all are covered by Article 3, paragraph 3.
For further details / restrictions - see Installation Instruction
Description of Pressure Equipment
Refrigerant regulating valve, with straight or angled bonnet arrangement
Type
SVA/REG 6-10
Nominal bore
DN
≤
25 mm.
(1 in.)
References of other Technical Standards and Specifications used
prEN 12284
DIN 3158
AD-Merkblätter
Authorised Person for the Manufacturer within the European Community
Name:
Morten Steen Hansen
Title:
Production Manager
Signature:
Date:
18/11/2002
148B9734 - rev. 0
4
DKRCI.PI.KC0.A2.02 / 520H0748
© Danfoss A/S (RC-CMS/MWA), 10-2005
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