Flowserve BA46 - Manual (Page 25)

5
Installation
– continued –
Heat treatment of welds
After welding the continuous blowdown valve in place the welds might require a subsequent heat
treatment (stress-relief annealing process to DIN EN 0059). Note that the heat treatment must be
limited to the area close to the welds. The internal parts of the continuous blowdown valve do not have
to be removed before performing the heat treatment.
Attention
n
Only qualified welders certified according to EN 87- may weld continuous
blowdown valves in pressurised lines .
Reposition control lever by 180 ° (if position of installation is unfavourable)
If the position of installation is unfavourable (flow from right to left), it may be necessary to reposition the
control lever by 80 ° so that the scale plate can be seen .
. Take heed of the danger note on page 5.
. Unscrew the hexagon nut
T and detach control lever U with the aid of a pulling device.
3. Undo stuffing box screws A , remove stuffing box gland C and scale plate B. Turn scale plate
by 80 ° and put it back in place.
4. Screw out nozzle stem R by half a turn and tighten stuffing box screws A with a torque of
7 Nm (DN 5 – 3) or 11 Nm (DN 40, 50).
5. Turn nozzle stem R into the closed position, applying a torque of 7 Nm. Put control lever U in place
and align scale S with the scale plate B such that the diamond-shaped marker “ 0 ” is in the
middle of the scale plate.
6. Screw hexagon nut T onto the threaded part of the nozzle stem R and tighten with a torque of
20 Nm while holding the control lever.
Install sample valve
. Unscrew sealing plug O and remove gasket N .
. Observe installation instructions of the sample valve.
3. Install the sample valve, applying rules of good practice.