Fluid injector with flat sealing surface

A method of delivering liquefied gaseous fuel from a fuel injector, the method comprising:

• providing pressurized liquefied gaseous fuel to the fuel injector, the fuel injector comprising:
• a housing defining a fuel path from an inlet end to an outlet end,
• a nozzle disposed at the outlet end of the housing, the nozzle forming a valve seat and including an orifice therein, and
• a valve assembly disposed in the housing, the valve assembly including a reciprocating valve body and a valve seal held by the valve body, wherein the valve seal is formed of an elastomeric material and includes a flat sealing surface that faces the nozzle, wherein the valve seat includes an annular upward projection that surrounds the orifice, and wherein the annular upward projection presses into the flat sealing surface of the valve seal when the valve is in the closed position;
• holding the valve body in a closed position in which the flat sealing surface contacts the valve seat of the nozzle so as to inhibit flow of fuel through the orifice;
• and
• moving the valve body away from the nozzle so as to allow liquid fuel to pass through the orifice and be delivered from the fuel injector.