Invention Grant
US09267476B2 Two stage valve with conical seat for flow shut-off and spool knife edge for metering flow control 有权
具有锥形座的两级阀,用于流量关闭和阀芯刀刃用于计量流量控制

Two stage valve with conical seat for flow shut-off and spool knife edge for metering flow control
Abstract:
A valve (100) comprises a barrel (104) having a central bore (110), an inlet (112), and an outlet (114, 116), and a spool (120) disposed for motion within the central bore, including a ball tip (128), a metering edge (130), and a bore (132). The spool is moveable between a closed position, wherein the ball tip engages a seat (142) to prevent fluid flow through the inlet and the metering edge is disposed in a lower chamber (148) of the central bore to prevent the fluid flow through the outlet, and an opened position, wherein the tip is spaced apart from the seat to permit fluid flow through the inlet and the spool bore into an upper chamber (154) of the central bore to equalize pressure on the spool, and the metering edge is disposed in a flow path of the outlet to permit fluid flow through the outlet.
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