Richter KAP-N Series Bottom Drain Ball Valves - Manual (Page 8)

Installation and Operating Manual
Series KA-N, KAP-N, ball and stem
9520-067-en Revision 00
TM 6404 MPE/Wm Page 8 Edition 02/2006
6.3 Grounding
The valve must be grounded. The simplest solution is
to use tooth lock washers which are placed under one
pipe bolt of each flange.
Otherwise grounding must be ensured by different
measures e.g. a cable link.
The stem 202 is grounded using a grounding spring
washer 557.
6.4 Test pressure
The test pressure PT of an open valve must not
exceed the value of 1.5 x PS(PN) as per the identifica-
tion of the valve.
7 Operation
7.1 Initial commissioning
Normally, the 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 valve; this could result in a possible
reaction with the medium.
To prevent leaks, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature.
For torques see Section 1.2.
7.2 Inadmissible modes of opera-
tion and their consequences
The bottom drain ball valve is an on/off valve and is
not to be operated in an intermediate position.
Damage to the seat rings or the ball/stem unit
could occur.
Crystallisation may result in damage to the seat
rings or ball/stem. This can be prevented by heat-
ing.
In extreme cases this may cause blocking.
If the ball blocks, do not apply force as the
ball/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
bottom drain 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 6.1.
Ensure that a remotely actuated actuator
cannot be accidentally switched on.