HG1
5.2 Installation position
The valve can basically be installed in any position.
If the concentration of suspended matter is high (e.g. media which are very viscous), it is recommended to
mount the high performance butterfly valve with valve shaft in horizontal position and stop boss facing upwards.
For nominal sizes >DN300 it is generally recommended to mount the valve with valve shaft in horizontal posi-
tion.
The recommended pressure direction (direction of the arrow on the body) guarantees the highest level of tight-
ness. The valve also provides a reliable seal when it is used against the recommended pressure direction.
Consult the manufacturer if the valve is to be used for applications with a frequent change of pressure direction.
5.3 Initial operation
Factory-provided the valve was tested for leaks with air or water. Remains of the test medium may still be
present at the contact surfaces of the valve. Pay attention to any reactions with the operating medium. Before
installing the valve, flush the pipeline and remove any general impurities, welding residues, etc. Remove the
transport packaging shortly before fitting the valve to avoid damage during transport.
Before putting the valve into operation:
▪check that all necessary connections (e.g. compressed air connections) are connected and secure.
▪flush the pipeline with the valve completly open to remove any impurities (such as welding residues) that may
have occurred during installation.
▪check the function of the valve. If there is any doubt about the function, replace the valve.
During a system pressure test the following pressures must not be exceeded:
>
1,5 x PS with shut-off element in open position
>
1.1 x ∆PS (max. differential pressure) or 1.1 x PS (max. operating pressure) with the shut-off element
closed, the lower value must be used.
NOTICE
Flushing process
The valve must not be switched during the flushing process.
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Version 0 • Dokument-Nr. 74572811
Internet: www.gefa.com • E-Mail: [email protected]
