Richter BVIP/F Series Ball Valves (ISO/DIN) - Manual (Page 10)

Series BVI/F, BVIP/F
Page 10
9520-090-en Revision 10
TM 8361 Edition 10/2011
7 Operation
7.1 Initial commissioning
Normally, the ball valves have been tested for leaks
with air or water. Prior to initial operation check body
bolting. For torques see Section 1.2.
Unless otherwise agreed, there could be
residual amounts of water in the flow section
of the ball valve; this could result in a
possible reaction with the medium.
To prevent leaks, all connection screws must be
checked and retightened if needed after the initial
loading of the valve with operating pressure and
operating temperature.
For torques see Section 1.2.
7.2 Improper operation and their
consequences
Under no circumstances must the operating
parameters specified on the identification plate be
exceeded.
The ball valve is an on/off valve and shall not be
operated in an intermediate position.
Damage to the seat rings or the ball/stem unit or
ball and stem could occur.
Crystallisation may result in damage to the seat
rings or the ball/stem unit or ball and stem. This
can be prevented by heating.
In extreme cases this may cause blocking.
If the ball blocks, do not apply force as the
ball/stem unit or ball and stem may break if the
max. adm. torque is exceeded.
Operation with solids leads to increased wear.
Operating during cavitation leads to increased
wear.
Non-observance of the pressure-temperature
diagram can lead to damage.
Do not subject the lever to heavy loads; the lever
or ball valve may be damaged.
Do not use a lever extension as otherwise there is
a risk of damage.
7.3 Shutdown
The local regulations are to be observed when
dismantling the valve.
Prior to undoing the flange connection ensure, that the
plant is depressurised and emptied.
Prior to starting any repair work, the valve is
to be thoroughly cleaned. Even if the valve
has been properly emptied and rinsed,
residual medium may still be found in the valve,
After dismantling, immediately protect the valve
flanges against mechanical damage with flange caps.
See also Section 5.1.
Ensure that a remotely actuated actuator
cannot be accidentally switched on.
8 Malfunctions
Flange connection ball valve/pipe is leaking
Retighten the flange screws to a tightening torque
according to Section 1.2. If this does not remedy
the leak, the recommended torques may be ex-
ceeded by 10%.
If this also fails to stop the leak, dismantle and
inspect the ball valve.
Flange connection main body/body end piece is
leaking
Retighten body screws. See paragraph "Flange
connection valve/pipe is leaking".
Packing is leaking
Retighten packing nuts according to the details in
Section 1.2.
Ball valve does not operate
Is the actuator being supplied with power?
Is any directional control valve connected cor-
rectly?
Is there any foreign matter in the valve?
The ball no longer closes completely
Is the stem deformed?
Is the coupling worn?
With a worm gear or actuator, check whether the
end stops can be re-adjusted. The operating
manuals of the gear and actuator manufacturers
contain accurate instructions.
Never apply force to the lever or use an
extension.
1. Try to get the ball valve working again by
moving the lever to and from.
2. Remove the lever stop and try to switch against
the
normal direction of rotation.
3. If actuation is not possible with the max. admissi-
ble
breakaway torque as per Section 1.4, dismantle
ball valve and inspect individual
components.