工程数据 ENGINEERING DATA
ENGINEERING DATA
HOW TO AVOID PROBLEMS
¢ Ball valves will be transported ¢ Always specify anti-explosive ¢ Advise Valbart of cycle
and stored with the ball in the
fully open position.
Flanged ends and welded
ends will be protected.
End protection will be removed
only when the valve is installed
in the line.
Valves will be handled
using the proper lifting lugs.
Valves will be stored according
to Valbart storage procedures.
Long-term storage should be
avoided.
In case of long storage the
valve shall be flushed and
cycled a few times.
For welded-end valves, advise
Valbart if there will be a post-
weld heat treatment (transition
pups may be necessary to
avoid damages to seals).
Flush and clean the line
before operating the valve.
Make sure no line-testing
fluid is left in the line and/or
the valve body.
Avoid leaving the valve body
filled with salt water to
prevent internal corrosion.
During line-testing, valves will
be left in the partially open
position for the minimum
possible amount of time.
Standard ball valves will be
used for on-off service only.
Throttling service (use of the
valve with the ball partially
open) can damage the seats.
Make sure to take into
consideration the actual
service conditions when
selecting materials for
O-rings and seat inserts.
frequency to ensure proper
sizing of actuator.
decompression material for
valves to be used in high-
pressure gas service.
e Do not use the actuator
Make sure the selected to lift the valve.
actuator has been properly
sized (an oversized actuator
can be as dangerous as an
undersized one).
Valbart side-entry bolted body trunnion-mounted ball Valves destined for
offshore service.
WARRANTY CLAUSE
WARNING: Valbart Srl will not accept claims for damages
due to poor handling on site and/or for valves service
conditions different from the ones for which they have
been manufactured and sold by Valbart Srl.
In any case in which Valbart Srl is not made aware of the
actual use of the valves (e.g., the valves ordered by a
third party, such as a Distributor) it is responsibility of the
third party and/or the user to verify the suitability of the
valve materials and design for the medium and service
conditions in which the valves will be used.
33
