vacuum reducer valve

Definitions

Cars & Driving

  • noun a valve used to limit the amount of vacuum governing the ignition advance mechanism of the distributor; on some ignition systems, a VRV is used to reduce inlet manifold vacuum when the coolant temperature is above 104°C, in order to prevent detonation.
  • acronymVRV
http://www.dictionarycentral.com/definition/vacuum-reducer-valve.html