초록 ▼

A low-noise plug valve is formed with a plug in which one side wall of the plug is a grid defined by a plurality of small openings therethrough, which openings lead from the through passage of the plug to a region outside the plug and which grid is movable into partial flow-blocking relation with re

A low-noise plug valve is formed with a plug in which one side wall of the plug is a grid defined by a plurality of small openings therethrough, which openings lead from the through passage of the plug to a region outside the plug and which grid is movable into partial flow-blocking relation with respect to the valve body outlet, in partially open positions of the plug. The grid creates a back pressure which suppresses the flashing and the formation of cavitation bubbles. The grid openings, in the partially open position of the plug, are in substantial alignment with the direction of flow.

대표청구항 ▼

A low-noise plug valve in which a plug is rotatably mounted in a valve body to control the flow between an inlet port and an outlet port, the improvement comprising: means in said plug defining a through passage, wall means in said plug defining one side of said through passage, said wall means havi

A low-noise plug valve in which a plug is rotatably mounted in a valve body to control the flow between an inlet port and an outlet port, the improvement comprising: means in said plug defining a through passage, wall means in said plug defining one side of said through passage, said wall means having an outer surface defining a clearance space with the adjacent inside wall of said valve body and movable into partial flow-blocking relation with said valve body outlet port in partially closed positions of said plug, and means in said plug wall means defining a plurality of openings leading from said passage into said clearance space providing for throttled flow therethrough into said clearance space in partially closed positions of said plug.