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Maintenance
SVA/REG 10-40
Fig. 6
Fig. 9
Fig. 10
ENGLISH
PACKING GLAND
If there is internal pressure in a valve, it is a
general rule that the packing gland must not be
removed. However, if the following precautio-
nary measures are taken the packing gland can
be removed with the valve still under pressure:
BACKSEATING (FIG. 6)
To backseat the valve, turn the spindle anti-
clockwise until the valve is fully open.
PRESSURE EQUALIZING (FIG. 7)
In some cases pressure is formed behind the
packing gland. Therefore fix a handwheel or a
big washer plate on top of the spindle while
the pressure is equalized. The pressure is equali-
No 2516-262 Sheet: 2/2 Rev. 0
Fig. 7
Fig. 11a
zed by slowly unscrewing the packing gland.
REMOVAL OF PACKING GLAND (FIG. 8)
Handwheel/washer plate and packing gland
can now be removed.
REPLACEMENT OF O-RINGS AND GASKET
(FIG. 9)
Replace the O-rings and gasket in the packing
gland. Only original Danvalve O-rings and
gaskets should be used. If there are marks of
blow on the spindle it should be replaced.
LUBRICATION (FIG. 10)
To achieve the optimal tightness the rail in the
middle of the packing gland must be filled with
original grease supplied by Danvalve (part. No.
2452+143).
533
Fig. 8
Fig. 11b
DISASSEMBLAGE OF THE VALVE (FIG. 11A)
OBS: Do not remove the top part, while the
valve is still under pressure.
Check that the O-ring (Pos. A) is undamaged.
The teflon cone ring cannot be replaced. If the
teflon cone ring is damaged, the cone must be
replaced.
REPLACEMENT OF THE CONE (FIG. 11B)
Unscrew the cone screw (Pos. D) by means of
an Allen wrench NV 2 (part of Danvalve's set of
gaskets). Remove the balls (Pos. E - 10 or 14
balls depending on the valve size). Now the
cone can be removed. Place a new cone on the
spindle and readd the balls. Screw on the cone
screw and be sure that it is flush with the surfa-
ce of the cone. If the cone is replaced more
than once, it is necessary to use Loctite No. 648
to be sure that the cone screw is properly faste-
ned.
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