Vacuum Delay Valves

Types Of Vacuum Delay Valves:

Vacuum Delay & Vacuum Retard Delay Valves

NOTE: VDVs are Black on one side and colored on the other. VRDVs are White on one side and colored on the other.

Connect a hand vacuum pump, to one side of the delay valve.

When vacuum is applied to a VDV or a VRDV, vacuum should hold on one side only, then visibly decrease slowly.


Vacuum Delay Valves Vacuum Retard Delay Valves

Black & Color Time (seconds) White & Color
Gold < .35 > Gold
Gray < 1-4 > Gray
Brown < 2-5 > Brown
White < 4-12
4-15 > Pink
Yellow < 5-14 > Yellow
Blue < 7-16
Green < 9-20 > Green
Lt.Green < 13-24
Red < 15-28 > Red
60 > Purple


Two-Way Vacuum Delay Valves
This type of delay valve is one solid color.

Connect a hand vacuum pump, to one side of the delay valve.

When vacuum is applied to the valve, vacuum should hold on both sides before visibly decreasing.
There is no free flow direction in this valve.

Color Time (seconds)
Pink 4-6
Blue 2.75-4.25
Orange 1.5-2.5
Brown 2-5
White 4-12
Yellow 5-14