BuildCraft gates are devices which can be attached to a pipe to detect and interact with objects nearby. Gates
+can read a wide variety of conditions: that a nearby chest is full, or that a Combustion
+Engine is about to overheat. In reaction to these conditions, gates can
+emit various kinds of signals (including redstone signals) to control other gates and/or machines.
An Example: Controlling Engines
Before diving into all the details, let's look at a realistic example of what you might do with gates. This is a
+small power plant driving a quarry.
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+
+
+
Here are the important pieces of the build:
+
+
The on/off switch for the entire operation. Flipping the switch creates a redstone signal.
A Basic Gate attached to a Structure Pipe reads the redstone signal and generates a red pipe wire signal.
Another Basic Gate receives the red pipe wire signal and converts it back to a redstone signal, thus turning
+the Combustion Engines on.
The red pipe wire signal is also received by Basic Gates next to the [Redstone
+Engine(/browse/buildcraft/redstone_engine)s, turning them on as well, and causing both fuel and water to
+flow into the engines.
Finally, the power generated by the Combusion Engines flows into the Quarry.