Sigma S2Ba Betriebsanleitung PDF herunterladen (Seite 21)

CAUTION!

Danger of the integral relief valve failing

The integral relief valve no longer operates reliably with feed

chemicals having a viscosity of greater than 200 mPa s.

– Only use the integral relief valve with feed chemicals

having a viscosity up to 200 mPa s.

CAUTION!

Warning against leaks

Feed chemical which remains in the overflow line at the relief

valve, can attack the valve or cause it to leak

– Route the overflow line with a continuous slope and

moreover with the tube nozzle pointed downwards - see

Fig. 16.

If the overflow line is fed into the suction line, the bleed func‐

tion is blocked.

Therefore lead the overflow line back into the storage tank.

When operating the integral relief valve close to the opening

pressure, a minimal overflow into the overflow line can occur.

CAUTION!

Danger resulting from unnoticed diaphragm rupture

If the pump has been ordered with an electric diaphragm rup‐

ture sensor, it still has to be installed.

– Screw the enclosed diaphragm rupture sensor into the

liquid end.

CAUTION!

Warning of unnoticed diaphragm rupture

Only above approximately 2 bar system back pressure is a

signal generated upon a diaphragm rupture.

– Only rely on the diaphragm rupture sensor at back pres‐

sures greater than 2 bar.

P_SI_0023

Fig. 16: Permissible alignment of the relief

valve

Diaphragm rupture sensor

Installation, hydraulic

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Sigma S2Ba Betriebsanleitung Seite 21