Valve assembly for a central tire inflation system

A valve assembly for a central tire inflation system, comprising:

• a first housing having a first port connected to a second port via a cavity, wherein the first housing is positioned within a second housing, which comprises a control port and a tire port, and the second port is in fluid communication with a wheel assembly;
• a biasing member disposed in the cavity adjacent a first perforation formed in the first housing;
• and
• a valve member contacted by the biasing member, the valve member comprising a first frustoconical portion having a continuous outer surface connected to a second portion having a continuous outer surface, a first end connected to the second portion and a second end connected to the first frustoconical portion wherein the continuous outer surfaces of the first frustoconical portion and the second portion allow a pressurized fluid to flow between the first housing and the outer surfaces of the valve member.