Wilo Stratos GIGA Serie Instrucciones De Instalación Y Funcionamiento página 51

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Fig. 41: Bleed valve
Installation and operating instructions Wilo-Stratos GIGA
• To avoid cavitation noise and damage, a minimum inlet pressure must
be guaranteed at the suction port of the pump. This minimum inlet
pressure depends on the operating situation and the duty point of the
pump, and must be defined accordingly.
• The main parameters for defining the minimum intake pressure are
the NPSH of the pump at its duty point and the vapor pressure of the
fluid.
• Bleed the pumps by releasing the bleed valves (Fig. 41, Item 1). Dry
running destroys the mechanical seal of the pump. The differential
pressure sensor must not be bled (risk of destruction).
WARNING! Danger due to extremely hot or extremely cold pres-
surized fluid!
Depending on the temperature of the fluid and the system pres-
sure, when the vent screw is opened completely, extremely hot or
extremely cold fluid in liquid or vapor form may escape or shoot
out at high pressure.
• Always exercise caution when opening the vent screw.
• Protect the module box from any water escaping when bleeding.
WARNING! Danger of death!
Falling pumps or pump parts may result in life-threatening injuries.
• When performing installation work, protect the pump compo-
nents against falling.
WARNING! Danger of burns or freezing to the pump when body
parts come into contact with the pump!
Depending on the pump or system operating conditions (fluid
temperature), the entire pump can become very hot or very cold.
• Keep a safe distance during operation!
• Allow the pump/system to cool off/warm up before performing
any work.
• Always wear protective clothing, protective gloves and protec-
tive goggles when working.
WARNING! Danger of injury!
If the pump/system is installed improperly, liquid may be ejected
during commissioning. Individual components may also become
loose.
• Keep a safe distance from the pump during commissioning.
• Wear protective clothing, protective gloves and protective goggles.
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