QM-Nr: FB_BMA_01-R-0804engl_3
Erstellt/
Prepared
: am/
on:19/11/2015
Genehmigt/
Approved: am
/
on19/11/2015
12 / 16
by ROFI S.A.R.L.
opened during pickling to prevent the pickling medium penetrating the packing area. Flushing should be
done with the valve half-shut to facilitate thorough flushing of the internal surfaces.
5.3. Venting
In accordance with the relevant Accident Prevention Regulations (UVV) valves and fittings should be
vented by means of specially fitted vent pipes or stuffing box connections. Venting by slackening off the
bonnet flange or the stuffing box gland is not permitted and can cause danger. If vents are required as
non standard extra, we recommend that these be fitted in our works.
5.4. Heating and cooling rates
To avoid damaging the valve body material or flange connections the normal plant-related heating and
cooling rates must be observed. If in doubt, consult us (see chapter 4.3)
5.5. Additional operating rules
Manual shut-off valves are right-hand or clockwise shutting. Back gears and remote drives are designed to
retain this direction of rotation. Because valves are frequently subjected to high temperatures and develop
surface and radiated heat as a result, protective clothing (especially gloves) should be worn. This is also
recommended when operating valves where leaks can allow hazardous media (e.g. steam, acids) to
escape. Hand wheels of electric actuators are for emergency operation only; they are disengaged during
normal operations and can be engaged when required.
Attention
!
Valves with hand wheel must only ever be manually operated. The use of bars or pipes to
increase leverage can damage the unit and cause an accident through slippage or failure, and is
not permitted.
Where bypasses or drain valves are fitted to prevent temperature shocks to piping downstream or for
other reasons, these secondary fittings must be operated before the main valve. For setting, maintenance
and operation of actuators, refer to the manufacturer's instruction manual.
5.6. Function testing
After installation, the valve must be function tested prior to initial operation. The valve, whether manually
operated or driven, should be opened and shut at least once.
5.7. Checking during and after first operation
During operation the tightness of the stuffing box and bonnet flange as well as the pipe connection flanges
must be monitored. If necessary bolts should be further tightened (see points 3.7 and 4.1). Left
unattended, leaks can cause erosion of the seal faces and seals and hence lead to permanent leakage.
Seal tightness should be checked after a while since seals and bolts etc.. are apt to settle during initial
operation, especially at high temperatures.
