Richter KNARP-S/F Series Control Ball Valves - Manual (Page 10)

Series Series KNAR/F, KNARP/F, KNAR-D/F, KNARP-D/F,
Page 10
KNAR-S/F, KNARP-S/F ASME
9520-082-en Revision 04
TM 7377 Edition 11/2008
6 Installation
Examine valve for in-transit damage, damaged ball
valves must not be installed.
Before installation the valve and the connecting
pipe must be carefully cleaned to remove any dirt,
especially hard foreign matter.
During installation, pay attention to the correct
tightening torque, aligned pipes and tension-free
assembly.
Ensure that a remotely actuated actuator
cannot be accidentally switched on.
6.1 Flange caps and gaskets
Leave protective caps on the flanges until just prior
to installation.
Where there is a particularly high risk of damage to
the plastic sealing surfaces, e.g. if the mating flanges
are made of metal are glass-lined, PTFE-lined gaskets
with a metal inlay should be used. These gaskets are
available as special accessories in the Richter range.
6.2 Direction of flow and
installation position
Installation is independent of the direction of flow.
A direction arrow on an additional name plate for
control ball valve shows the direction of flow. See
Section 1.1.
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.
At the customer's request a setscrew M6 with a hex.
nut and washer will be provided at each flange as an
additional grounding connection.
The V-control ball/stem unit 201 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
identification 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 1.3.
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 1.3.
7.2 Improper operation and their
consequences
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
could occur.
Crystallisation may result in damage to the seat
rings or ball/stem unit. 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 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.