Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
231 words
A check valve assembly for permitting unrestricted flow in one direction and limited flow in the reverse direction comprising: (a) a valve body having a longitudinal flowbore therethrough and including a first body portion telescopically engaging a second body portion for limited axial movement relative thereto; (b) seat means carried by said valve body within said flowbore; (c) closure means, comprising a flapper member, pivotally mounted within said valve body for pivotal movement from a normally open position in which flow through said flowbore is unrestricted, to a closed position, engaging said seat means, in which reverse flow through said valve body is prevented; and (d) sleeve means carried by said valve body and including a first sleeve member, connected to said first body portion and responsive to said limited axial movement for movement between a first configuration, preventing movement of said closure means from said open position, and a second configuration, allowing movement of said closure means to said closed position, and a second sleeve member engageable with said first sleeve member, said second sleeve member being moveable, upon movement of said first body portion from an extended to a retracted position, from a first position, in which said second sleeve member prevents movement of said closure means from said open position, to a second position in which said second sleeve member does not prevent movement of said closure means.
Claim 2
Dependent Claim
231 words
A check valve assembly for permitting unrestricted flow in one direction and limited flow in the reverse direction comprising: (a) a valve body having a longitudinal flowbore therethrough and including a first body portion telescopically engaging a second body portion for limited axial movement relative thereto; (b) seat means carried by said valve body within said flowbore; (c) closure means, comprising a flapper member, pivotally mounted within said valve body for pivotal movement from a normally open position in which flow through said flowbore is unrestricted, to a closed position, engaging said seat means, in which reverse flow through said valve body is prevented; and (d) sleeve means carried by said valve body and including a first sleeve member, connected to said first body portion and responsive to said limited axial movement for movement between a first configuration, preventing movement of said closure means from said open position, and a second configuration, allowing movement of said closure means to said closed position, and a second sleeve member engageable with said first sleeve member, said second sleeve member being moveable, upon movement of said first body portion from an extended to a retracted position, from a first position, in which said second sleeve member prevents movement of said closure means from said open position, to a second position in which said second sleeve member does not prevent movement of said closure means.
Claim 3
Dependent Claim
50 words
A check valve assembly as set forth in claim 1 including connection means connecting said first and second body portions in said extended position, said connection means being releasable upon the application of a predetermined axial force to permit axial movement of said first body portion to said retracted position.
Claim 4
Dependent Claim
46 words
A check valve assembly as set forth in claim 1 in which said first and second body portions are provided with mutually engageable, longitudinal male and female spline portions for transferring a torque applied to one body portion to the other throughout said limited axial movement.
Claim 5
Dependent Claim
25 words
A check valve assembly as set forth in claim 1 in which said seat means comprises an annular seating surface carried by said sleeve means.
Claim 6
Dependent Claim
26 words
A check valve assembly as set forth in claim 1 including biasing means carried within said valve body, biasing said flapper member toward said closed position.
Claim 7
Dependent Claim
30 words
A check valve assembly as set forth in claim 1 wherein said second sleeve member is provided with latch means for locking said second sleeve member in said second position.