With a suction optimised dosing profile, the suction stroke is elongated as
much as possible, which makes possible a precise and problem-free
dosing of viscous and gaseous media. Select this setting to minimise the
NPSH value as well.
5.2
Liquid end
The diaphragm (2) hermetically shuts off the pump volume of the dosing
head (4) towards the outside. The suction valve (1) closes as soon as the
diaphragm (2) is moved in to the dosing head (4) and the feed chemical
flows through the discharge valve (3) out of the dosing head. The dis‐
charge valve (3) closes as soon as the diaphragm (2) is moved in the
opposite direction due to the vacuum pressure in the dosing head and
fresh feed chemical flows through the suction valve (1) into the dosing
head. One cycle is thus completed.
Fig. 7: Cross-section through the liquid end
1 Suction valve
2 Diaphragm
3 Discharge valve
4 Dosing head
5 Backplate
13 Safety diaphragm
5.3 Bleed valve and integrated relief valve
Turning the rotary dial (3) on the bleed valve to "open" causes it to open
and the liquid end can be bled. Or it is used as a priming aid for priming
against pressure. The feed chemical flows out through the hose connec‐
tion (5), e.g. into a storage tank.
The integral relief valve operates in the "close" position as a simple,
directly controlled relief valve. As soon as the pressure exceeds the pres‐
sure value, which is preset using the large spring (1), it lifts the ball (2).
The feed chemical flows out through the hose connection (5), e.g. into a
storage tank.
Bleed valve
Integral relief valve
Functional Description
19
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