NOVELTY - The valve (28) has a fluid inlet (28C) for receiving a fuel cell reactant. A fluid outlet (28D) is fluidly arranged downstream of the fluid inlet. A fluid reactant transit (28B) cooperates with the fluid inlet and the fluid outlet. One of the transit, the fluid inlet and the fluid outlet defines an orifice passage (29A) i.e. passive orifice passage, which is formed with a sharp edge such that a portion of moisture contained within the fuel cell reactant that is deposited on the sharp edge is conveyed from the orifice passage in environmental conditions.    USE - Ice-resistant valve i.e. solenoid valve, for use in a fuel cell system utilized for providing motive force to a vehicle i.e. motor car.    ADVANTAGE - The fluid reactant transit, the fluid inlet or the fluid outlet defines an orifice passage that is formed with the sharp edge such that the portion of moisture contained within the fuel cell reactant that is deposited on the sharp edge is conveyed from the orifice passage in the environmental conditions, so that freezing of the deposited moisture takes place away from the orifice passage, thus preventing ice blockage in the orifice passage and allowing the orifice passage to be open even under freeze-inducing ambient temperatures. The orifice passage permits a flow of humid gas under sub-freezing conditions without the need for supplemental energy devices, thus simplifying the overall design of the valve and reducing the cost, weight, size, reliability and system efficiency of the valve.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for inhibiting freeze-related blockage of a reactant flow path in a fuel cell system of a motor car    (2) a method for supporting cold catalytic heating during a fuel cell stack cold start in an environmental condition.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional perspective view of an ice-resistant valve with an insert placed in a reactant flow path.    Ice-resistant valve (28)    Fluid reactant transit (28B)    Fluid inlet (28C)    Fluid outlet (28D)    Orifice passage (29A)