Vacuum delay valve
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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 motors
, and other vacuum devices.
The engine in a common
windshield wipers to operating emissions control
items.
Engine vacuum
is 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.[1]
| Color Code | Time (seconds) | Threshold (+/- seconds) | Direction | |
|---|---|---|---|---|
| Orange | Black | 2 | 0.5 | Forward |
| Purple | Black | 4 | 0.8 | Forward |
| Gray | Black | 10 | 2 | Forward |
| Brown | Black | 20 | 4 | Forward |
| White | Black | 63.5 | 13.5 | Forward |
| Yellow | Black | 100 | 20 | Forward |
| Green | Black | 200 | 40 | Forward |
| Orange | White | 2 | 0.5 | Reverse |
| Purple | White | 4 | 0.8 | Reverse |
| Gray | White | 10 | 2 | Reverse |
| Gold | White | 15 | 3 | Reverse |
| Brown | White | 20 | 4 | Reverse |
| Yellow | White | 100 | 20 | Reverse |
| Red | White | 375 | 75 | Reverse |
References
- ^ "1988 Jeep Cherokee Technical Service Manual.", "Spark Control System." Chrysler, 1987.
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