A fuel tank isolation valve, comprising: a housing sub-assembly including a solenoid coil and a compression spring for an over-vacuum relief function; a shaft assembled with a seal sub-assembly for inline guiding of a flow limiter; a nozzle body provided with a plurality of mounting holes, a first nozzle and a second nozzle connected to a fuel tank and a canister respectively, via a fuel vapour flow path (62, 64), the nozzle body being mounted over the housing sub-assembly and being sealed by the seal sub-assembly; a compression spring for an over-pressure relief function fixed over the flow limiter which performs the over-pressure relief function; a stroke limiter mounted after the flow limiter and inside the nozzle body to control the maximum flow by controlling an operating stroke of the flow limiter; and a cover to close the valve and to maintain the installation height of the compression spring for the over-pressure relief function; wherein: the flow limiter is provided with an integrated sealing seat and a guiding hole; the seal sub-assembly is comprised of a plunger with a further guiding hole and an over molded rubber seal having a first sealing surface for the over-pressure relief function and a second sealing surface for the over-vacuum relief function; the shaft maintains the sealing seat in parallel with respect to the first sealing surface and avoids misalignment of the flow limiter with respect to the first sealing surface; the second sealing surface seals with a surface of the nozzle body; the stroke limiter controls the maximum flow by controlling the operating stroke of the flow limiter; the solenoid coil has a first and second o-ring (52, 54) placed at top and bottom grooves in a way that leakage and immersion of fuel inside the solenoid coil is restricted after over molding of the housing sub-assembly; and the solenoid coil has a terminal seal with terminal pins in a way that leakage and immersion of fuel inside the solenoid coil is restricted from the terminal pins after over molding of the housing sub-assembly. a housing sub-assembly including a solenoid coil and a compression spring for an over-vacuum relief function; a shaft assembled with a seal sub-assembly for inline guiding of a flow limiter; a nozzle body provided with a plurality of mounting holes, a first nozzle and a second nozzle connected to a fuel tank and a canister respectively, via a fuel vapour flow path (62, 64), the nozzle body being mounted over the housing sub-assembly and being sealed by the seal sub-assembly; a compression spring for an over-pressure relief function fixed over the flow limiter which performs the over-pressure relief function; a stroke limiter mounted after the flow limiter and inside the nozzle body to control the maximum flow by controlling an operating stroke of the flow limiter; and a cover to close the valve and to maintain the installation height of the compression spring for the over-pressure relief function; wherein: the flow limiter is provided with an integrated sealing seat and a guiding hole; the seal sub-assembly is comprised of a plunger with a further guiding hole and an over molded rubber seal having a first sealing surface for the over-pressure relief function and a second sealing surface for the over-vacuum relief function; the shaft maintains the sealing seat in parallel with respect to the first sealing surface and avoids misalignment of the flow limiter with respect to the first sealing surface; the second sealing surface seals with a surface of the nozzle body; the stroke limiter controls the maximum flow by controlling the operating stroke of the flow limiter; the solenoid coil has a first and second o-ring (52, 54) placed at top and bottom grooves in a way that leakage and immersion of fuel inside the solenoid coil is restricted after over molding of the housing sub-assembly; and the solenoid coil has a terminal seal with terminal pins in a way that leakage and immersion of fuel inside the solenoid coil is restricted from the terminal pins after over molding of the housing sub-assembly. the flow limiter is provided with an integrated sealing seat and a guiding hole; the seal sub-assembly is comprised of a plunger with a further guiding hole and an over molded rubber seal having a first sealing surface for the over-pressure relief function and a second sealing surface for the over-vacuum relief function; the shaft maintains the sealing seat in parallel with respect to the first sealing surface and avoids misalignment of the flow limiter with respect to the first sealing surface; the second sealing surface seals with a surface of the nozzle body; the stroke limiter controls the maximum flow by controlling the operating stroke of the flow limiter; the solenoid coil has a first and second o-ring (52, 54) placed at top and bottom grooves in a way that leakage and immersion of fuel inside the solenoid coil is restricted after over molding of the housing sub-assembly; and the solenoid coil has a terminal seal with terminal pins in a way that leakage and immersion of fuel inside the solenoid coil is restricted from the terminal pins after over molding of the housing sub-assembly.