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The U-sleeve seals must be replaced by
bending them slightly into an oval shape
and carefully pull them off in an angle and
pushing the new one from an angle. The
wear ring, pos. D, must be undamaged,
otherwise replace.
- Oil the U-sleeve seals, pos. C, and wear
ring, pos. D
- Carefully refit the cone with cylinder and
at the same time place one of the bolts
in pos. B to control the position of the
remaining six bolt holes.
- Rotate the cone ot get the holes aligned
- Refit also the center bolt and tighten.
- Check that the U-sleeve seals are in place
and the wear ring is positioned before
slowly moving the spindle upwards
checking that the seals move into place
over the bevel.
Replacement of backseat seal (fig. 10)
The valve backseat is a special teflon ring. If
this is damaged, it must be replaced. Screw
the spindle out of the bonnet. Carefully
remove the original backseat seal and
mount a new one in the angled contact
surface directly inside the opening in the
bonnet. Avoid folding and damage to
the teflon ring, or damage to the contact
surface at the top of the valve during
assembly.
Assembly
Remove any dirt from the body before the
valve is assembled. Resposition the valve
cone on the SVA-DH bonnet as described
above with consideration to the U-sleeve
seal. Check that the cone has been screwed
back towards the bonnet before it is
replaced in the valve body (fig. 5a).
Tightening
Tighten the bonnet with a torque wrench,
to the values indicated in the table (fig. 5b).
Tightening of the bonnet should be
performed according to sound mechanical
practice.
Tighten the packing gland with a torque
wrench, to the values indicated in the table
(fig. 11).
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 Danfoss.
4
DKRCI.PI.KG0.A3.02 / 520H0746
www.danfoss.com/IR
© Danfoss A/S (AC-SMC/MWA), 11-2011
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