Richter GR/F Series Check Valves - Manual (Page 8)

Series GR/F
Page 8
9550-075-en Revision 01
TM 6897 Edition 10/2007
6 Installation
Examine valve for in-transit damage, damaged
ckeck 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.
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 or enamel, 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
The direction of flow must be observed when installing
the valve. It is indicated by a direction arrow on the
valve body.
The closing operation is already initiated by the gravity
of the closing element when the flow rate decreases.
Plug check valves are particularly streamlined. The
solid plug seals against a falling or back-flowing liquid
level.
Only a horizontal installation position is possible for the
check valve GR/F. Make sure that the cover is on top.
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.
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.
Otherwise grounding must be ensured by different
measures e.g. a cable link.
6.4 Test pressure
The test pressure PT of a 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 cover
screws. 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 should be
retightened 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
Crystallisation must be prevented, e.g. by heating.
In the extreme case a blockage may occur.
Increased wear occurs in operation with solids
contents.
Increased wear occurs in operation under
cavitation.
Non-observance of the pressure-temperature
diagram can lead to 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
emtied.
Prior to starting any repair work, the valve is to be
thoroughly cleaned. Even if the valve has been
properly emtied 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.