Flowserve HV 215 - Manual (Page 20)

20
Bottom valve HWV 215/1 - DN 80
Installation
– continued –
The supplied bottom valve consists of three component parts - the valve head, the body with the actuating cylinder
and the control unit. The valve comes with a set of assembly parts.
The assembly parts of the valve head comprise:
n
Gasket ∅ 25
n 2 Locking washers
n 2 Socket head cap screws M6 x 30
First attach the valve head from the outside to the valve mounting flange.
See drawing on page 23
. Put the gasket
6 onto the valve head.
2. Place the valve head onto the mounting flange and insert the supplied socket-head cap screws c and locking
washers d in the valve mounting flange and tighten them with a torque of 20 Nm. Apply a commerically
available lubricant to the screws and tighten them in several steps in diagonally opposite pairs.
3. Check the spacing between the bottom of the valve plug e and the seat flange 7 (cf. reference dimension
on page 23). 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 e. A spacing of 7± mm is required. If the reading exceeds this
tolerance, check the position of the seal of the valve plug e. If necessary push the valve plug e slightly
upwards. Dirty seals or the incorrect position of the valve plug seal may have caused this problem.
Should even after this examination the actual readings still exceed the specified tolerances, please contact our
Technical Services in your country, stating the Gestra manufacturing number indicated on the name plate.
31
31
Attention
Check and, if necessary, clean sealing surfaces.
The specified torques must be strictly observed.