Fluid flow control valve
    6.
    发明授权

    公开(公告)号:US06260575B1

    公开(公告)日:2001-07-17

    申请号:US09162343

    申请日:1998-09-28

    IPC分类号: F16K1734

    摘要: A flow control valve arrests fluid flow from a primary line to a branch line when flow into the branch line exceeds a predetermined flow rate. In one embodiment for use with an irrigation system, the valve includes a T-fitting. The fitting defines a primary passage, which communicates with irrigation pipes, and a branch passage, which communicates with a riser and sprinkler assembly. A valve seat is located within a housing that couples with the fitting. The valve seat is located within the T-fitting when the valve is assembled. The location of the valve seat within the fitting allows the valve to function even when the riser and/or a portion of the housing is sheared off. A stopper selectively engages a valve seat to inhibit water flow through the branch passage when the flow rate through the branch passage exceeds the predetermined flow rate. In one embodiment, a biasing device prevents the stopper from engaging with the valve seat while the predetermined flow rate through the branch passage is momentarily exceeded by transient flow conditions.