초록 ▼

A stop valve (1) comprises a housing (2) having a passage (15) for a reversible medium flow, which can be stopped by means of a valve body (20) having an annular portion of a sphere as a sealing surface (25) and a flat end portion (26). The transfer area between said sealing surface (25) and said fl

A stop valve (1) comprises a housing (2) having a passage (15) for a reversible medium flow, which can be stopped by means of a valve body (20) having an annular portion of a sphere as a sealing surface (25) and a flat end portion (26). The transfer area between said sealing surface (25) and said flat end portion (26) having a very small bending radius (r) and the spherical radius (r1) of said sealing surface (25) is smaller than the turning radius (r2) of said valve body. The valve body (20) cooperates with a sealing ring (36), which is annular and surrounds the passage and has an annular body (37), which via a constriction (38) merges into a seat ring (39). The sealing ring (36) is, in the closing position of the valve, exposed with a smaller portion to that passage section, which houses said valve body, and with a larger portion to the other passage section. The mounting of said valve body ( 20) cooperates with a sealing ring (36), which is annular and surrounds the passage and has an annular body (37), which via a constriction (38) merges into a seat ring (39). The sealing ring (36) is, in the closing position of the valve, exposed with a smaller portion to that passage section, which houses said valve body, and with a larger portion to the other passage section. The mounting of said valve body has play which allows a position adjustment in the direction of said seat but not in the direction away from the seat.

대표청구항 ▼

A valve comprising a housing having a medium passage with an annular seat within the passage, a valve body provided with a partly spherical sealing surface at one end which co-operates with said annular seat to close and open said passage, which seat comprises an elastomeric ring, a spindle operable

A valve comprising a housing having a medium passage with an annular seat within the passage, a valve body provided with a partly spherical sealing surface at one end which co-operates with said annular seat to close and open said passage, which seat comprises an elastomeric ring, a spindle operable to rotate said valve body on a rotary axis transverse to the medium passage between closed and open positions, and a transfer arm on said spindle external to said housing for actuating the valve body and indicating its position, the improvement wherein said spherical surface portion of said valve body has a center of curvature which is eccentric to said rotary axis, and said housing, opposite said spindle, has a bearing pin projecting into the passage and supporting said vale body for rotation between said closed and open positions, said valve body having an opening engaged on said bearing pin, said pin abutting the opening on the seat side and provided with a limited designed play on the side opposite the seat side, whereby said body can move relative to said elastomeric ring at over-pressures and/or when wear or the like has occurred to allow the body to move somewhat closer tot he valve seat and improve its sealing capacity, said limited designed play between said pin and said opening on the opposite side being small enough to prevent a blow-out of valve body and seat at extreme pressures said limited designed play also limiting transverse displacement of said valve body when in the open position, said elastomeric ring operable to be compressed all around and retain the valve body in a centered position and yieldingly resist rotation of said eccentric spherical portion away from and into said closed position.