Samson BR 20a, Монтаж и эксплуатация

Страница: 26 / 60

5-4
EB 20a_EN
November 2023 edition
Subject to technical changes
Installation
Danger of crushing due to moving actuator- and control shaft!
Ö
Do not reach into the bracket as long as the pneumatic pow-
er is connected to the actuator.
Ö
Before working on the ball valve, interrupt and lock pneumat-
ic energy and the control signal.
Ö
Vent the actuator.
Ö
Do not allow the jamming of objects in the bracket to hinder
the operation of the actuator- and control shaft.
Ö
If the actuator- and control shaft are blocked (e.g. due to
“seizure” if not actuated for a long period of time”), release
the residual energy of the actuator (spring tension) before re-
leasing the blockage, see the corresponding actuator docu-
mentation.
Ö
Prior to disassembly of the actuator, bring the ball valve into
the fail-safe position.
Ö
At the end of installation, perform a functional test with the
control signals:
The ball valve must close and open correctly according to the
control commands. Detected malfunctions must be
fi xed be-
fore commissioning, see Chapter “8 Faults”.
Danger due to improperly executed control commands!
Incorrectly executed control commands can cause serious injuries
or even death and cause damage to the pipe system.
Ö
Check the actuator unit and control command., see chapter
“8 Faults”.
5.5.2 Pressure test of the pipe section
The pressure test was already performed on the ball valves by
PFEIFFER. Observe the following for the pressure test of a pipe
section with installed ball valves:
Ö
First carefully rinse newly installed pipe systems in order to
wash out all foreign matter.
Ö
Ensure the following conditions for the pressure test:
– Ball valve open: The test pressure may not exceed the val-
ue 1.5 x PN (according to the type plate).
– Ball valve closed: The test pressure may not exceed the
value 1.1 x PN (according to the type plate).
If a ball valve leaks, observe chapter “8 Faults”.
The plant operator is responsible for performing the pressure test.
After Sales Service at PFEIFFER can provide you with support for
the planning and implementation of a pressure test speci
fi c to
your plant.
WARNING
WARNING
Info
5.5.3 Swivelling movement
The rotary movement of the actuator- and control shaft must be
linear without any jerky movements.
Ö
Open and close the ball valve. When doing so, observe the
movement of the actuator shaft.
Ö
Set the maximum and minimum control signal in succession
to check the end positions of the ball valve.
Ö
Check the display on the position indicator.
5.5.4 Fail-safe position
Ö
Close the signal pressure line.
Ö
Check whether the ball valve moves to the fail-safe position,
see “Fail-safe positions in Chapter “3 Design and principle of
operation”.