10
4.3. Gas Ballast Valve
4.3.1 Standard Model
Gas ballast valve 2 is fitted with a sliding sleeve which, when
pushed towards the pump, opens the valve and when pushed
away from the pump, shuts the valve (Fig. 7). Intermediate
settings are not possible.
Gas ballast valve standard model
2
Gas ballast valve with sliding sleeve
28 Support
stand
2
28
Gasballast valve helium tight and corrosive gas models
4.3.2 Corrosive Gas Model
Gas ballast valve 2 is fitted with a dosing device and a
flushing gas connection. It has a sliding sleeve which opens
the valve when pushed towards the pump and shuts the valve
when pushed away from the pump (Fig. 8). The dosing device
is closed when the groove in the dosing screw is in the
horizontal position; in the vertical position the dosing device
is fully open. A flow meter enables any intermediate gas volu-
me setting between fully open and fully closed to be made.
Please note:
Flushing gas must be connected when operating corrosive
gas version pumps. The gas ballast valve must be open. Flus-
hing gas pressure may not exceed 1.5 bar. Our specialists
would be pleased to give advice regarding the type and volu-
me of flushing gas required.
