PPV

The Pressure protection valve feeds auxiliary circuits (e.g. air suspension) with air from another circuit. 

There are 3 types of pressure protection valves: without back flow, with back flow and with limited back flow. The pressure protection valve is normally installed directly into the vehicle reservoir using an M22 bulkhead connector (vehicle piping diagram required before installation). The air flow direction from 1 to 2 (see arrow on valve) must be observed.