The invention relates to a fluid circulation valve comprising a body (2) through which said fluid can pass, and a first and second shutoff means (3, 3′), arranged in series, in the direction of flow of the fluid, in said body and each able, by rotation of said means (3, 3′) with respect to said body (2) to occupy various angular positions, said valve further comprising a drive train allowing said shutoff means (3, 3′) to be driven off one and the same actuating motor, said valve being configured to: —over a first angular range of said first shutoff means (3) allow said fluid to be metered in a first outlet port (40) of said valve, said second shutoff means (3′) being in a position in which said first port (40) is wide open, —over a second angular range of said first shutoff means (3) allow said fluid to be metered in a second outlet port (42) of said valve, said second shutoff means (3′) being in a second position in which said second port (40) is wide open.