Richter SRZ-V/F Series Check Valves - Manual (Page 9)

Series SR/F, SR-B/F, SRV/F, SRV-B/F, SRZ-V/F
Page 9
9550-060-en Revision 00
TM 7173
Edition 06/2008
6 Installation
Examine valve for in-transit damage, damaged
check 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 accessories in the Richter range.
6.2 Direction of flow and
installation position
The best installation position is vertical. The closing
process is initiated by the gravity of the ball as the
flow decreases.
A horizontal or inclined installation position is also
possible. For this purpose a minimum differential
pressure of 1 bar (with a hollow ball 0.5 bar) is
necessary so that the ball is pushed into the seat.
With low opening differential pressures the designs
SRV/F, SRV-B/F with hollow ball and SRZ-V/F with a
hollow plug may also be used for this. If the
installation position is reversed, SRV/F, SRV-B/F and
SRZ-V/F also function as vacuum check valves and
venting valves.
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 other
means, e.g. cable bridges.
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.
Not permitted with series SRV/F, SRV-B/F, remove
the hollow ball for the pressure test.