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Home >> Chevrolet >> 2008 >> Optra5 LT, Automatic >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transaxle - ZF 4HP 16 - Service, Overhaul, Removal & Installation, Troubleshooting & Diagnosis >> Park or Neutral - Engine Running >> Line Pressure Control Valve >> Reduction Valve

Reduction Valve

The reduction valve reduces the line pressure to the downstream solenoid valves and the pressure control solenoid valves. This makes it possible to use smaller solenoid valves.

The line pressure comes from the oil pump and flows to the reduction valve. The inlet port to the reduction valve is blocked and the line pressure is maintained at the appropriate level.