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At an air spring pressure of >3.5 bar, the valve
body lifts against the resilience of both valve
springs and opens valve seats 1 and 2. The air
spring pressure then passes to the air dryer
via the throttle and non-return valve 3. Once it
has passed through the air dryer, the air flows
through the valve seat of the pressure
limiting valve and the discharge filter into the
ambient air.
The significant drop in pressure downstream
from the throttle results in the uptake of the
relative air humidity whereby the moisture
uptake of the “waste air” is increased.
Pneumatic discharge valve
The pneumatic discharge valve performs two
tasks:
• It is a residual pressure retaining device
• and a pressure limitation device
A predefined minimum pressure (>3.5 bar) is
necessary to prevent damage to the air
springs (U-bellows).
The residual pressure retaining device
ensures that the pressure in the air
suspension system does not fall below
3.5 bar during de-pressurisation (except in
the case of leaks upstream from the
pneumatic discharge valve).
242_037
Discharge valve N11
Pneumatic discharge valve (cover)
Valve body
Pressure limiting valve
Valve seat 1
Valve seat 2
Discharge filter
Vent pipe
Non-return valve 3
Air dryer
Throttle
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