Frank FEM 718 MSE-Z Operating Instructions Manual page 6

3.2.2 Water and cleansing agent/Preserving agent system
The incoming water from the mains flows past the float valve into the water inlet tank.
The high-pressure pump collects the water and conveys it under pressure to the safety
spray lance.
Cleaning agent A or B can be added to the water through dosing valves via 2 solenoid
valves. For this purpose, the suction tubes for the cleaning agents are placed in the
tanks filled with cleaning agents.
The solenoid valves in the cleaning agent suction hoses shut off or open the intake of
cleaning agents in accordance with the programme selected on the control cabinet.
3.2.3 Safety spray lance with mechanical spray gun
The mechanical spray gun permits operation of the machine only when the safety
control lever has been activated. The spray gun is opened by activating the lever.
When the lever is released, the gun is closed, preventing any further release of fluid
from the spray lance.
When the gun is closed during operations, a pressure surge in the system is released, as
a result of which the machine is switched off by means of a pressure switch. After the
pressure has fallen to approx. 20 bar, the machine is switched on again by a second
pressure switch, when the lever of the gun is activated once again.
3.2.4 Overflow safety valve
The overflow safety valve with integrated electric pressure switch protects the
machine against excessive pressure and is designed in such a manner that it cannot be
set above the maximum admissible operating pressure. The check nut of the
handwheel is sealed with lacquer.
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The spray gun is a safety device. Repair works are to be carried out by
experts only.
Replacement, repair works, and settings are to be carried out
by experts only.