Richter GR/F Series Check Valves - Manual (Page 9)

Series GR/F
Page 9
9550-075-en Revision 01
TM 6897 Edition 10/2007
8 Malfunctions
Flange connection valve/pipe is leaking
Retighten the flange screws to a tightening torque
according to Section 1.2. If this does not remedy
the leak, the recommended torques may be
exceeded by 10%.
If this also fails to stop the leak, dismantle and
inspect the valve. Flange connection main body/body end piece is
leaking
Retighten body screws. See paragraph "Flange
connection ball valve/pipe is leaking".
Valve does not close
Are there solids between the sealing surface and
the ball?
Is the sealing surface damaged?
Is the ball damaged?
9 Maintenance
All repair work is to be performed by qualified
personnel using the appropriate tools. Generally
recognised practice in mechanical engineering is to
be observed.
For the arrangement, designation and item
numbers of all parts of the valve, see Section 10.
Spare parts are to be ordered with all the details in
acc. with the valve identification.
Only original spare parts may be installed.
To prevent leaks, a regular check of the connection
screws should be made in line with the operating
requirements.
For torques see Section 1.2.
9.1 Demontage
9.1.1 Replacing plug
Remove cover screws 901/1, 936/1 (with DN 100
902/2, 936/1, 920/3).
Pull guide 801 with shank 808 and valve plug 204
out of the body 100.
DN 25-100
Pull round cord 522 with pliers out of the valve plug
204.
Replace valve plug 204.
Check to see whether the seat 205 is still OK:
If not: Replace. See Section 9.1.2.
9.1.2 Replacing seat
A screw-in tool is required for the assembly and
dismantling of the seat 205. The article numbers for
the individual nominal sizes are listed in Section 1.3.
The new seat must be carefully protected prior to
assembly. The sealing edge and the sealing surface
for the plug must not be damaged.
Remove the upper part of the valve as described in
Section 9.1.1.
Screw the seat 205 out of the body with the Richter
screw-in tool. Right-hand thread.
Carefully clean the sealing surface in the body 100
and check for damage.
If there is any damage, you can try to rework the
sealing surface.
Screw the new seat 205 without lubricant into the
body using the Richter screw-in tool.
9.2 Montage
Assembly is performed in reverse sequence.
Prior to assembly all parts must be cleaned and the
plastic-lined parts checked for damage.
Bolt body 100 and cover 106 together. Tighten the
screws in diametrically opposing sequence to a
torque indicated in Section 1.2.