Flowserve 5801 Notice De Montage Et Mode D'emploi page 19

EN

When the valve is installed in the piping:
• When working at temperatures below 100 °C and with liquids,
flushing of the actuator is performed using the upper vent plug.
In the case of vapours and gases, the pressure reduction
valve/relief valve is ready for use once the connections have
been made.
• At working temperatures above 100 °C, water is fed through
the fill nozzle of the rundown tank with the side vent plug
on the actuator opened until the water emerges without any
air bubbles. Close the vent plug and top up with water to 35
mm below the upper edge of the fill nozzle. The pressure-
reduction valve / relief valve is ready for use once the fill
opening has been closed.
• Continuously increase load until operation parameters are
reached.
Sudden exposure of the valve to the full working pressure and working
temperature may cause stress cracks.
• After the first loading (trial run) in depressurised and cool
condition, evenly tighten screw connections of sealing
components crosswise (if required).
• Excessive levels of noise and vibration during operation
indicate critical operating conditions and must be avoided at
all costs.
Impermissible continuous operation of valves under critical conditions can
damage the valves, as they are not designed to cope with this situation.
• Avoid frequent system start-ups and shutdowns.
Experience has shown that critical operating conditions, which can damage the
valve, are often encountered when starting up or shutting down the system.
• Keep the operating medium free of foreign particles.
Foreign particles can damage the valve; this can be prevented by fitting a suitable
dirt trap.
Bodily injury or damage to the control valve and its accessories as the result of non-
adherence to warning instructions, as well as transport damage and improper use
(e.g. as a climbing aid, etc.), will render the manufacturer's guarantee null and void
and release him from any responsibility.