Flowserve HV 205 - Manual (Page 20)

20
Maintenance
– continued –
Mounting bottom valve HWV 205 / 1 - DN 80
Before mounting the bottom valve first attach the valve head from the outside to the
mounting flange.
Drawing see page 22
1. Put the gasket onto the valve head.
2. Place valve head onto the mounting flange and tighten socket-head cap screws
and locking washer with a torque of 120 Nm. Apply a commerically available
lubricant to the screws and tighten them in several steps in diagonally opposite pairs.
3. Check spacing between bottom of valve plug and seat flange (reference
dimension 1 see page 22). For this purpose you can hold a try square to the bottom
of the valve head and read off the distance to the bottom of the valve plug. A distance
of 7± 1mm is required. If the reading exceeds this tolerance check the position of the
valve plug seal
of the valve plug . If necessary push the valve plug slightly
upwards.
Dirty seals or the incorrect position of the valve plug seal
may have caused the
problem. Should even after this examination the actual readings still exceed the
specified tolerances, please contact our Technical Service in your country, stating
the Gestra manufacturing number indicated on the name plate.
6
23
24
25 7
31 25 25
31
Attention
Check and, if necessary, clean sealing surfaces.
The specified torques must be strictly observed.