Non-turbulent shut-off valve

An industrial fluid flow shut-off valve assembly, comprising:

• a valve body having an inlet and an outlet, a partition wall with a frusto-conical valve seat therein separating the valve body into an inlet section and an outlet section with the inlet section communicating with the inlet and the outlet section communicating with the outlet, a valve member reciprocably mounted in the valve body movable from an open position permitting flow from the inlet section to the outlet section and a closed position engaging the valve seat in the partition wall blocking flow from the inlet section to the outlet section, said valve member being annular and having a substantially axially uniform cross section so that the forward end of the valve member is substantially the same size as the rear end thereof, an annular valve seat on each end of the valve member, and a valve stem removably receiving the valve member, said valve member being reversible on the valve stem so the annular seat on the rear end of the valve member can be the annular seat on the forward end of the valve member after valve member reversal on the stem, said valve member having upper and lower annular grooves extending from the periphery of the valve member receiving the first and second valve seats so that the valve seats are exposed to the periphery of the valve member, a first removable plate clamping the upper one of the valve seats to the valve member and a second removable plate clamping the lower one of the valve seats to the valve member without covering the outer periphery of the valve seats so that upon removal of the plates the valves seats are free from the valve member for easy replacement or reversal and so that either valve seat may be utilized to engage and seat in the valve body frusto-conical valve seat and either valve seat may be easily replaced or reversed on itself universally without the use of tools for prying from the valve member and without damaging the valve seats.