A check valve assembly has a body having a central cavity intersected by upstream and downstream flow passages. A seat is secured by a threaded engagement in the upstream flow passage. An access bore intersects the cavity and has a support shoulder formed in it. A holder is supported on the support
A check valve assembly has a body having a central cavity intersected by upstream and downstream flow passages. A seat is secured by a threaded engagement in the upstream flow passage. An access bore intersects the cavity and has a support shoulder formed in it. A holder is supported on the support shoulder. A flapper is pivotally secured to the holder and located in the cavity for movement between an open position and a closed position blocking flow through the seat. A straight edge portion in the access bore engages a straight edge portion of the holder to prevent rotation of the holder. A fastener extends through a hole in the support shoulder into engagement with the seat to prevent rotation of the seat.
대표청구항▼
1. A check valve assembly, comprising: a body having a central cavity intersected by upstream and downstream flow passages;a shoulder formed in the body;a holder positionable onto the shoulder, the holder including a lip extending around its periphery to facilitate complimentary engagement with the
1. A check valve assembly, comprising: a body having a central cavity intersected by upstream and downstream flow passages;a shoulder formed in the body;a holder positionable onto the shoulder, the holder including a lip extending around its periphery to facilitate complimentary engagement with the shouldera flapper pivotally secured to the holder, the flapper movable between a closed position, to block fluid flow through the upstream flow passage, and an open position, to enable fluid flow through the upstream flow passage; anda seat disposed proximate the upstream flow passage, the seat including exterior threads threadingly engaging corresponding internal threads on the upstream flow passage, the seat includes a downstream side having a larger diameter than an upstream side of the seat and the diameter of the seat threads to define a flange having an upstream facing shoulder, wherein the seat is configured to engage the flapper when the flapper is in the closed position. 2. The assembly of claim 1, further comprising an access bore intersecting the cavity, wherein: the shoulder is formed in the access bore;the shoulder has a predetermined first width and a ledge having a width larger than the first width;a portion of the lip has an increased width to facilitate complementary engagement with the ledge to prevent rotational movement of the holder relative to the access bore;the ledge includes a straight edge configured to mate with a corresponding straight edge on the holder lip to prevent rotational movement of the holder relative to the access bore. 3. The assembly of claim 2, wherein the ledge is proximate the upstream flow passage. 4. The assembly of claim 2, further comprising an opening extending through the ledge for receiving a fastener to engage with and prevent movement of the seat from within the upstream passage. 5. The assembly of claim 1, wherein the upstream passage includes a counterbore that defines a downstream facing shoulder and wherein an upstream end of the seat abuts the downstream facing shoulder, the upstream end of the seat having a seal that abuts and seals against the downstream facing shoulder. 6. The assembly of claim 1, wherein the holder further comprises a pair of hinge blocks, each hinge block including an opening that is axially aligned with the other opening to receive a pin to pivotally secure the flapper to the holder. 7. The assembly of claim 1, wherein the flapper is pivotally connected to the holder by a clevis. 8. A check valve assembly, comprising: a body having a central cavity intersected by upstream and downstream flow passages;a shoulder formed in the body;a holder positionable onto the shoulder, the holder including a lip extending around its periphery to facilitate complimentary engagement with the shouldera flapper pivotally secured to the holder, the flapper movable between a closed position, to block fluid flow through the upstream flow passage, and an open position, to enable fluid flow through the upstream flow passage; anda seat disposed proximate the upstream flow passage, the seat includes a downstream side having a larger diameter than an upstream side of the seat to define a flange having an upstream facing shoulder, wherein the seat is configured to engage the flapper when the flapper is in the closed position, and the upstream facing shoulder is spaced apart from and forming a gap between an upstream wall of the central cavity. 9. A check valve assembly, comprising: a body having a central cavity intersected by upstream and downstream flow passages;the upstream flow passage having a set of internal threads adjacent the cavity and a downstream facing shoulder upstream from the internal threads;a seat having upstream and downstream sides, a central orifice extending therethrough, an outer surface having a set of external threads that engage the internal threads in the upstream flow passage, the upstream side of the seat having a seal and abutting the downstream facing shoulder and the downstream side of the seat having a larger diameter than an upstream side of the seat defining a flange, the flange having an upstream facing shoulder that is spaced apart to form a gap between an upstream wall of the cavity;a support shoulder extending at least partly around an interior of the access bore;a holder supported on the shoulder, the holder having a central opening and a hinge block;an anti-rotation device on the holder to resist rotation of the holder; anda flapper pivotally secured to the hinge block and movable between an open position, to facilitate fluid flow through the upstream flow passage, and a closed position, to block fluid flow through the upstream flow passage. 10. The assembly of claim 9 wherein the anti-rotation device comprises a straight edge on the support shoulder and a corresponding lip on the holder, the lip having a straight portion that abuts the straight edge to resist rotation of the holder. 11. The assembly of claim 9, wherein: the support shoulder extends around an access bore, wherein the width of the support shoulder is greater above the seat than the remaining portions of the support shoulder;a hole formed in the greater width portion; anda fastener extending through the hole and into engagement with the seat, the fastener preventing the seat from rotating within the upstream passage. 12. The assembly of claim 11, further comprising: a set of threads formed in the access bore above the support shoulder; anda cap that secures to the threads in the access bore and abuts an upper side of the holder to retain the holder on the support shoulder. 13. The assembly of claim 9, wherein the anti-rotation device comprises a straight edge formed on the support shoulder and wherein the hinge block engages the straight edge to resist rotational movement of the holder. 14. A check valve assembly, comprising: a body having a central cavity intersected by upstream and downstream flow passages, the upstream passage having a counterbore that defines a downstream facing shoulder;a seat having upstream and downstream sides and a central orifice extending therethrough, and an external flange on the downstream side of the seat that is spaced apart from an upstream wall of the cavity by a gap, the upstream side of the seat having a seal and abutting the downstream facing shoulder of the body;a support shoulder;a fastener extending through a hole in the support shoulder into engagement with the seat to prevent rotation of the seat;a holder having a central opening and supported on the support shoulder;a straight edge portion extending on the support shoulder and engaged by a corresponding lip on the holder to prevent rotation of the holder; anda flapper pivotally secured to the at least one hinge block on the holder, the flapper disposed in the cavity for movement between an open position and a closed position for blocking flow through the orifice of the seat. 15. The valve assembly of claim 14 further including a pair of spaced apart hinge blocks on the holder. 16. The valve assembly according to claim 14, wherein the holder is generally in the shape of a horse-shoe. 17. The check valve assembly according to claim 14, wherein the holder is removable from an access bore. 18. A holder for a flapper used in a check valve assembly, the check valve assembly comprising a body having a central cavity intersected by upstream and downstream flow passages, a seat disposed proximate and secured to the upstream flow passage by threads, the seat including a downstream side having a larger diameter than the threads and an upstream side of the seat to define a flange having an upstream facing shoulder, a shoulder having a predetermined first width and includes a ledge portion having a width larger than the first width, and a flapper pivotally secured to the holder and movable between an open and closed position to block fluid flow through the upstream flow passage, the holder comprising: a lip to facilitate complimentary engagement with the shoulder, wherein a portion of the lip has an increased width to facilitate complementary engagement with the ledge portion to prevent rotational movement of the holder. 19. The holder of claim 18 further comprising a straight edge on the holder lip configured to mate with a corresponding straight edge on the ledge to prevent movement of the holder relative to an access bore from which the shoulder extends. 20. A method of assembling a check valve assembly, the valve assembly having a body with a central cavity intersected by upstream and downstream flow passages, the method comprising: pivotally securing a flapper to a holder member, the holder member including a lip extending around an outer periphery of the holder member, a portion of the lip having an increased width;securing a seat having a central orifice in the upstream flow passage, the seat including a downstream side having a larger diameter than an upstream side of the seat to define a flange having an upstream facing shoulder, wherein the method further comprises positioning the seat such that a gap is formed between the seat and an upstream wall of the cavity;inserting the holder member and flapper and positioning the holder member on a shoulder, the shoulder having a predetermined first width and including a ledge portion having a width larger than the first width; andaligning the lip with the shoulder to facilitate complimentary engagement therewith to prevent rotational movement of the holder member and position the flapper within the central cavity for movement between an open and closed position to facilitate fluid flow therethrough. 21. The method of claim 20, wherein the upstream passage includes a counterbore that defines a downstream facing shoulder, wherein the method includes positioning an upstream end of the seat to abut the downstream facing shoulder such that a seal on the upstream end of the seat abuts and seals against the downstream facing shoulder. 22. The method of claim 20 further comprising inserting a fastener through an opening extending through the ledge to engage and prevent movement of the seat from within the upstream passage.
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