Planmeca Compact I Technical Manual page 166

Chapter G - PARTS REPLACEMENT & REPAIR
Pulse valve closes (after every five seconds)
Overfill situation
G-16 Planmeca Compact i
Electrical function:
Control voltage is no longer connected to the pulse valve.
Pneumatical function:
The vacuum in the upper chamber forces the intermediate
membrane to expand, thus the pressure balancing mem-
brane blocks the opening between the upper and lower
chambers. The breather valve opens, since the pulse
valve no longer connects the vacuum to the membrane of
the breather valve. The drain membrane opens allowing
water to flow into the drain.
Electrical function:
The emergency switch connects and cuts the control volt-
age from all the valves related to the separating tank.
Emergency
switch
Pneumatical function:
The liquid level in the upper chamber reaches the critical
point and the float pushes the microswitch. All the mem-
branes are open and water flows to the drain from both the
Float
chambers. Since the main valve is closed, the vacuum is
not led to the tank nor the suction tubes. The suction will
start again after five seconds delay, supposing that the liq-
uid level has fallen below the critical level.
SUCTION SYSTEM RELATED
Technical Manual