Silenced valve construction

In a valve, a valve body having an inner floor between inlet and outlet ports, a bridge dividing the interior of said body into an upstream chamber communicating with the inlet port and a downstream chamber communicating with the outlet port, said bridge spanning said floor in the downstream chamber and having a circular valve seat on an axis substantially normal to said floor, the valve seat portion of said bridge having an inner wall defining the outer confines of an axially extending annular passage for accommodation of fluid flow between said chambers, a valve member and means for coaxially positioning the same for coaction with said seat, and an elongate perforated cylindrical sound-absorbent structure within said passage and defining the inner confines of said annular passage, said sound-absorbent structure extending in approach to said floor, said sound-absorbent structure including a perforated outer wall surface in radially opposed spaced relation to said inner wall and defining with said inner wall said annular passage for fluid flow downstream from said valve member, the spacing of said perforated wall surface from said inner wall being such as to establish a flow area in said passage of at least maximum valve-open effective area.

In a valve, a valve body having inlet and outlet ports, a circular valve seat carried by said body between said ports and having an inner wall defining the outer confines of an axially extending annular passage on the downstream side of said seat for accommodation of fluid flow from the inlet port to the outlet port of said valve, valve-member means for coaction with said seat and including a stem guided for reciprocation within and on the axis of said passage, and elongate annular porous sound-absorbent structure within said passage and carried by said valve-member means, said sound-absorbent structure including a cylindrical outer-wall surface with plural openings, the spacing of said outer wall surface from said inner wall surface being such as to establish a flow area in said passage of at least maximum valve-open effective area.

In a valve, a valve body having inlet and outlet ports, a circular valve seat carried by said body between said ports and having an inner wall defining the outer confines of an axially extending annular passage on the downstream side of said seat for accommodation of fluid flow from the inlet port to the outlet port of said valve, a valve stem guided for reciprocation on the axis of said passage, a valve member carried by said stem for coaction with said seat, and an elongate cylindrical sound-absorbent structure in spaced relation to and within said inner wall, said sound-absorbent structure comprising sound-absorbent material and means including an outer cylindrical retaining wall for said material, said retaining wall having plural openings for fluid exposure to said sound-absorbent material, and said retaining wall defining the inner confines of said annular passage, the spacing between said inner and outer confines being such as to establish a flow area in said passage of at least maximum valve-open effective area.