Alkon Pressure Protection Valve

A pressure protection valve is used to protect the system air supply from dropping below the minimum opening pressure of the valve due to air loss from downstream applications. A typical application would be in an air brake system to protect a reservoir by closing automatically when a reservoir system failure occurs.


  • Applications Transportation: air brake systems, air suspensions and cabin controls for trucks, trailers, RVs, buses, and all transit and rail uses
  • Material Anodized aluminum
  • Mounting Inline mount. Consult factory for other mounts.
  • Pressure 40-90 psi cracking, 200 psi supply max
  • Sizes 1/4 NPT; ported
  • Temperatures Approved for -40°F to 180°F


The valve is typically mounted to the tank via the inlet port. The dual pressure rating reflects the minimum opening pressure (higher psi) and closing pressure (lower psi). The optional downstream check prevents backflow through the pressure protection valve.
The pressure protection valve is a normally closed pressure-control valve. When supply air is greater than the set pressure, the valve opens and supplies air downstream. When air supply falls below the set pressure, the valve closes.