GB/T594-2008 External thread forged steel stop valve 

    Stop Valve is a valve whose closing part (disc) moves along the centerline of the valve seat.    There are some caveats. First, the handwheel handle operated Marine Stop Valve can be installed anywhere in the pipeline. Secondly, the flow direction of the medium should be consistent with the direction of the arrow on the valve body. The last thing to note is that the Stainless Steel Stop Valve has a relatively large flow resistance coefficient, which can cause pressure loss, especially in hydraulic installations.  The Marine Globe Valve is packaged in a wooden case with bubble wrap for drop protection.