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Principle of operation
• If the feed system is not operating, the suction line is blocked by the spring-loaded valve in
the HS-V.2.
• This valve opens with the vacuum generated when the pump unit starts up.
• If there is a leak in the suction line when the burner is not operating, the HS-V.2 remains
closed and thus prevents fuel escaping.
• The HS-V.2 is equipped with an integrated safety device against excess pressure - known
as a pressure relief valve. If, while the system is not operating, the pressure rises due to a
rise in temperature, for example, the valve opens towards the tank in relation to the safety
lheight that is set, approx. 0.2 to 2bar.

DESIGN

Figure 1:
Design version with sealing screw or
Inlet: Line from the tank or from the
operating tank of the pump unit
Outlet: Line to the consumer
Blind screw (test manometer G 1/8)
Handwheel
Display for safety height
Instead of a sealing screw
test valve
gauge. During general operations and after every FUNCTION CHECK it is necessary
to close the test valve
the limit stop.
Artikel-Nr. 15 513 50 c
the anti-siphon device can be equipped with a closable
with a 5mm nozzle
, which means turning the knurled screw
Arrow for flow direction
Test valve
Nozzle 5mm
Knurled screw
Type label
for the connection of a hose line to the pressure
test valve
anticlockwise to
19 / 60

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