A Pneumatic Control Valve
is a valve that works via compressed gas to limit a device, preventing
overloads, explosions or any number of other harmful effects. Newer
control valves work through sensors that monitor the internal conditions
of a device. The most common gas present in a pneumatic control valve
is compressed atmospheric air. In addition to compressed air, most
pneumatic control valve gases have a small amount of vaporized oil that
keeps the internal parts of the valve lubricated as it functions.
It is possible to find a Pneumatic Control Valve
on a huge number of different devices and machines. These valve types
are very common in industrial and factory machinery, such as in
manufacturing and processing machines. In addition, they are found on
heavy-duty hand-held tools like rivet guns and inside residential and
commercial machinery such as heating and cooling systems.
In nearly every instance of a Pneumatic Control Valve,
the valve requires a burst of compressed air to force a plug into a set
position that stops a dangerous situation from occurring. This burst
typically creates a mechanical reaction that forces the plug into an
opening that prevents a gas or liquid from passing. Sometimes this
process also reveals a secondary opening that allows the system to bleed
off the blocked material.
These systems typically respond to abnormally high heat, pressure or
flow rate. Any of these situations could result in damage to the device
or even an explosion. In most modern equipment, these factors are
monitored by an external system that also directly controls the
pneumatic control valve.

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