Hydac FSA Série Manuel D'utilisation page 13

1. General
The following instructions must be strictly
followed to ensure correct use of this FSA
fluid level gauge with check valves.
2. Function
2.1. FUNCTION OF THE CHECK VALVE
The use of the check valves is only
permitted in conjunction with HYDAC Fluid
Level Gauges.
The check valve is a spring-loaded cone
poppet valve which is normally closed when
at rest. The spring acts with a specific force
on the closing cone and presses it onto the
valve poppet. Tank pressure also presses
the closing cone onto the valve poppet and
shuts off the fluid leak-free from the fluid
level gauge.
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