Richter KNP-D/F Series Ball Valves (ISO/DIN) - Manual (Page 9)

Series KN/F, KNP/F, KN-D/F, KNP-D/F
Page 9
520-050-en Revision 10
TM 8361 Edition 10/2011
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.
If plastic sealing surfaces can be damaged, e.g. with
mating flanges made of metal or enamel, use PTFE-
lined seals with a metal inlay.
These are available as special accessories from the
Richter product range.
6.2 Direction of flow and
installation position
Installation is independent of the direction of flow.
Any installation position can be chosen.
Otherwise, it is marked by a direction arrow on the ball
valve, in the case of cavity-free ball/stem units ore
ball/stem units and Al
2
O
3
-balls with an additional relief
bore.
Fig. 1 ball/stem unit in closed position
Fig. 1 Al
2
O
3
-ball in closed position
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 ball/stem unit 201 and stem 202 are 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.