three main groups:
- Pressure limiting valves
- Pressure regulating valves
- Pressure sequence valves
The pressure limiting valves are utilised on the up-stream side of the
compressor to ensure the receiver pressure is limited, for safety, and
that the supply pressure to the system is set to the correct pressure.
The pressure regulating valve keeps the pressure constant irrespective
of any pressure fluctuations in the system. The valve regulates the pressure
via a built-in diaphragm.
The pressure sequence valve is used if a pressure-dependent signal is
required for the advancing of a control system.
When the applied control signal reaches the set pressure, the 3/2-way
valve incorporated at this point is actuated. Conversely, the valve reverses,
if the control signal falls below the set pressure.
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