The Results for the labs are enclosed in the attached lab handouts.
Pneumatic circuits work particularly well for safety circuits, especially those that are remotely operated, are
directly operated from two locations using a shuttle valve and are interlocked with an AND operation. It is
recommended that circuits be constructed with an AND operation by constructing it with 2 valves or some
type of safety component, like a push button or
Omron’s OS32C Safety Laser Scanner,
in parallel to ensure
that two conditions must be met before the hydraulic circuit will operate. It can be advantageous to restrict
the exhaust port of a valve so that the fluid, and therefore pressure, remains in the cylinder, making it
available for another actuation cycle. It is also recommended that accumulators be considered for safety
circuits as well. Accumulators hold pressure which can smooth fluid flow, thereby decreasing pulsation, as well
as maintain a reserve of pressure to allow for more immediate actuation.
Safety circuits are present throughout industry where machine operation can cause injury or death and can be
built with pneumatically powered circuits and can include accumulators. Applications include presses, shears,
CNC machines and stamping equipment. Furthermore, accumulators