Arrangement in closing valves
First Claim
1. A shutoff valve comprising:
- a valve housing having an inlet and an outlet;
a valve body within said valve housing, said valve body having a bore extending therethrough, said valve body and being movable between an open position in which fluid may flow between said inlet and outlet through said bore and a closed position in which such fluid flow is blocked, said valve body having at least one annular sealing surface thereon, said sealing surface being formed from a portion of a spherical surface of said body;
a main valve seat ring adapted to cooperate with said annular sealing surface of said valve body, said main valve seat ring being mounted in said valve housing for being displaceable along the axis of said ring toward said valve body, said main valve seat ring being displaceable along the axis of said ring away from said valve body;
means for urging said main valve seat ring toward said valve body and into sealing engagement with said sealing surface to seal said valve body in said valve housing;
at least one additional valve seat ring adapted to cooperate with said annular sealing surface of said valve body, said additional valve seat ring being mounted in said valve housing for being displaceable along the axis of said ring toward said valve body, said additional valve seat ring being displaceable along the axis of said ring away from said valve body;
means for urging said additional valve seat ring toward said valve body and into sealing engagement with said annular sealing surface to form a seal between said valve body and said additional valve seat ring;
each one of said valve seat rings being displaceable toward and away from said valve body independently of the other one of said valve seat rings; and
locking means for selectively locking said additional valve seat ring out of sealing engagement with said valve body.
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Accused Products
Abstract
A shutoff or closing valve, especially a ball valve, comprises a valve body (2) having at least one annular sealing surface formed for sealing engagement against a seal (5) carried by an axially displaceably supported seat ring (3). The seat ring (3) or each such seat ring, respectively, is adapted to be urged toward the sealing position, wherein its seal (5) cooperates and contacts the valve body (2), through the intermediary of spring force (4) and/or fluid pressure (via 6). In order to improve the sealing function and enable the accommodation of leakaqes between the valve body (2) and said seat(s) (3), the seat ring or each such seat ring, respectively, is assigned at least one additional separate seat ring (11) axially displaceably supported independently on the first-mentioned seat ring (3). The additional separate seat ring (11) may be arranged concentrically with, surround as well as rest displaceably against the first-mentioned seat ring (3).
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Citations
13 Claims
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1. A shutoff valve comprising:
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a valve housing having an inlet and an outlet; a valve body within said valve housing, said valve body having a bore extending therethrough, said valve body and being movable between an open position in which fluid may flow between said inlet and outlet through said bore and a closed position in which such fluid flow is blocked, said valve body having at least one annular sealing surface thereon, said sealing surface being formed from a portion of a spherical surface of said body; a main valve seat ring adapted to cooperate with said annular sealing surface of said valve body, said main valve seat ring being mounted in said valve housing for being displaceable along the axis of said ring toward said valve body, said main valve seat ring being displaceable along the axis of said ring away from said valve body; means for urging said main valve seat ring toward said valve body and into sealing engagement with said sealing surface to seal said valve body in said valve housing; at least one additional valve seat ring adapted to cooperate with said annular sealing surface of said valve body, said additional valve seat ring being mounted in said valve housing for being displaceable along the axis of said ring toward said valve body, said additional valve seat ring being displaceable along the axis of said ring away from said valve body; means for urging said additional valve seat ring toward said valve body and into sealing engagement with said annular sealing surface to form a seal between said valve body and said additional valve seat ring; each one of said valve seat rings being displaceable toward and away from said valve body independently of the other one of said valve seat rings; and locking means for selectively locking said additional valve seat ring out of sealing engagement with said valve body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification