A servo valve assembly, comprising: a housing defining a cylindrical cavity having a central axis (C-C), wherein the cavity includes a first cylindrical portion having a first diameter (D 1), a second cylindrical portion having a second diameter (D 2), a third cylindrical portion arranged axially between the first and second cylindrical portions (141, 142) having a third diameter (D 3), and a pair of transition portions defining opposing conical cavity surfaces (144, 145) that each connect a respective one of the first and second cylindrical portions (141, 142) with the third cylindrical portion; a spool disposed in the cavity and co-axially aligned with the central axis (C-C); wherein the spool comprises a pair of blocking members (130a, 130b) projecting radially therefrom, and each of the blocking members (130a, 130b) defines a conical blocking surface (134a, 134b) opposing a respective one of the conical cavity surfaces (144, 145) to define a fluid flow passage therebetween; wherein a cone angle (θa, θb) of each conical blocking surface (134a, 134b) relative to the central axis (C-C) is equal to a cone angle (θa, θb) of the opposing conical cavity surface (144, 145) relative to the central axis (C-C); and wherein the spool is moveable along the central axis (C-C) to vary a flow area of the flow passages between the conical blocking surfaces (134a, 134b) and the conical cavity surfaces (144, 145); wherein the spool further comprises a pair of retaining lands (122a, 122b) extending radially from the spool, the retaining lands (122a, 122b) each contacting a respective one of the blocking members (130a, 130b) to provide support thereto and configured to allow fluid communication from the flow passages to the third cylindrical portion, wherein the retaining lands (122a, 122b) each comprise a conical surface around their circumference; wherein each conical surface has a cone angle (θa, θb) relative to the central axis (C-C) that is equal to the cone angle (θa, θb) of the conical blocking surface (134a, 134b) of the respective blocking member (130a, 130b); and characterized in that, the third diameter (D 3) is smaller than the first and second diameters (D 1, D 2), the retaining lands (122a, 122b) are disposed axially inboard of the blocking members (130a, 130b), and the servo valve assembly further comprises a pair of opposing biasing members (110a, 110b) that are configured to bias the spool in opposing axial directions along the central axis (C-C) such that each conical blocking surface (134a, 134b) is biased towards the opposing conical cavity surface (144, 145). a housing defining a cylindrical cavity having a central axis (C-C), wherein the cavity includes a first cylindrical portion having a first diameter (D 1), a second cylindrical portion having a second diameter (D 2), a third cylindrical portion arranged axially between the first and second cylindrical portions (141, 142) having a third diameter (D 3), and a pair of transition portions defining opposing conical cavity surfaces (144, 145) that each connect a respective one of the first and second cylindrical portions (141, 142) with the third cylindrical portion; a spool disposed in the cavity and co-axially aligned with the central axis (C-C); wherein the spool comprises a pair of blocking members (130a, 130b) projecting radially therefrom, and each of the blocking members (130a, 130b) defines a conical blocking surface (134a, 134b) opposing a respective one of the conical cavity surfaces (144, 145) to define a fluid flow passage therebetween; wherein a cone angle (θa, θb) of each conical blocking surface (134a, 134b) relative to the central axis (C-C) is equal to a cone angle (θa, θb) of the opposing conical cavity surface (144, 145) relative to the central axis (C-C); and wherein the spool is moveable along the central axis (C-C) to vary a flow area of the flow passages between the conical blocking surfaces (134a, 134b) and the conical cavity surfaces (144, 145); wherein the spool further comprises a pair of retaining lands (122a, 122b) extending radially from the spool, the retaining lands (122a, 122b) each contacting a respective one of the blocking members (130a, 130b) to provide support thereto and configured to allow fluid communication from the flow passages to the third cylindrical portion, wherein the retaining lands (122a, 122b) each comprise a conical surface around their circumference; wherein each conical surface has a cone angle (θa, θb) relative to the central axis (C-C) that is equal to the cone angle (θa, θb) of the conical blocking surface (134a, 134b) of the respective blocking member (130a, 130b); and characterized in that, the third diameter (D 3) is smaller than the first and second diameters (D 1, D 2), the retaining lands (122a, 122b) are disposed axially inboard of the blocking members (130a, 130b), and the servo valve assembly further comprises a pair of opposing biasing members (110a, 110b) that are configured to bias the spool in opposing axial directions along the central axis (C-C) such that each conical blocking surface (134a, 134b) is biased towards the opposing conical cavity surface (144, 145).