Vacuum delay valve
A vacuum delay valve is a valve with a small orifice, which delays a vacuum signal. These are commonly used in automobiles to alter the behavior of
vacuum switches, vacuum motors, and other vacuum devices.
The engine in a common
automobileproduces almost 20 inches of vacuum, and this pressure differential has been utilized for everything from automatic locks and windshield wipersto operating emissions controlitems. Engine vacuumis also the best direct source of information on the engine's load.
Most delay valves have a one-way function, where there is either no restriction or no movement in one direction.
Delay valves are usually color-coded to their function. ["1988 Jeep Cherokee Technical Service Manual.", "Spark Control System." Chrysler, 1987.]
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