Relief Valve/Bleeder Valve - ProMinent Sigma X Operating Instructions Manual

Fig. 17: Elastomer flat seal with a smooth
insert
1
3
4
5
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Fig. 18: Manometer connector options
Fig. 19: Steel pipeline at the liquid end

7.1.1 Relief valve/bleeder valve

Integral relief valve or integral bleeder
valve
A back pressure valve, a spring-loaded injection valve, a relief valve, a
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foot valve or a liquid end do not represent absolutely leak-tight shut-off
elements.
Use a shut-off valve, a solenoid valve or a vacuum breaker for this
n
purpose.
To check the pressure conditions in the pipework system, we recommend
providing connecting options for a manometer close to the suction and
pressure connector.
1 Manometer sleeve
1
2 Pressure line (pipe)
3 Discharge valve
4 Suction valve
5 Suction line (pipe)
2
Connect the pipework to the pump ensuring that no residual forces act on
the pump, e.g. due to shifting, weight or expansion of the line.
Only connect steel or stainless steel pipework to a plastic liquid end using
a flexible section of pipe.
1 Steel pipeline
1
2 Flexible pipe section
3 Plastic liquid end
2
3
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Precise metering is only possible when the back
–
pressure is maintained above 1 bar at all times.
If metering at atmospheric pressure, a back pres‐
–
sure valve should be used to create a back pressure
of approx. 1.5 bar.
CAUTION!
Danger due to incorrect use of the integral relief valve
The integral relief valve can only protect the motor and
the gear, and then only against impermissible positive
pressure that is caused by the metering pump itself. It
cannot protect the system against positive pressure.
– Protect the motor and gear of the system against
positive pressure using other mechanisms.
– Protect the system against illegal positive pressure
using other mechanisms.
CAUTION!
Warning of feed chemical spraying around
If no overflow line is connected to the integral relief valve
or the integral bleeder valve, feed chemical will spray out
of the hose connector as soon as the relief valve opens.
– Always connect an overflow line to the integral relief
valve or the integral bleeder valve and feed it back
into the supply tank or - if required by the regulations
- into a special tank.
Installation
29