초록 ▼

A valve arrangement for stopping fluid passage through at least one flexible tubing is provided with a camshaft having at least one control cam which is designed as a sink in an otherwise closed circular surface of the camshaft for moving a press member which is retracted into an inactive relative p

A valve arrangement for stopping fluid passage through at least one flexible tubing is provided with a camshaft having at least one control cam which is designed as a sink in an otherwise closed circular surface of the camshaft for moving a press member which is retracted into an inactive relative position when radially aligned with the sink and which is protruded into an active relative position by the circular surface of the camshaft for then squeezing the associated portion of the flexible tube which is passed through a housing of the valve arrangement in a direction normal with respect to a longitudinal bore rotatably supporting the camshaft and also normal with respect to a radial bore which is arranged for radially guiding the press member.

대표청구항 ▼

A valve arrangement for stopping fluid passage through at least one flexible tubing is provided with a camshaft having at least one control cam which is designed as a sink in an otherwise closed circular surface of the camshaft for moving a press member which is retracted into an inactive relative p

A valve arrangement for stopping fluid passage through at least one flexible tubing is provided with a camshaft having at least one control cam which is designed as a sink in an otherwise closed circular surface of the camshaft for moving a press member which is retracted into an inactive relative position when radially aligned with the sink and which is protruded into an active relative position by the circular surface of the camshaft for then squeezing the associated portion of the flexible tube which is passed through a housing of the valve arrangement in a direction normal with respect to a longitudinal bore rotatably supporting the camshaft and also normal with respect to a radial bore which is arranged for radially guiding the press member. flow conduit, comprising in combination: a valve seat adapted to be placeable in a fixed position relative to the fluid flow conduit; said valve seat at least partially surrounding a passage for fluid flow through said valve seat; a flapper adapted to be placeable in at least two positions relative to said valve seat including a closed position and an open position; said closed position of said flapper at least partially abutting said valve seat and at least partially blocking said passage; said open position of said flapper providing less blockage of said passage than said closed position; a closure arm, said closure arm adapted to move between at least two closure arm positions, wherein said closure arm and said flapper pivot in a common rotational direction when opening and closing; said closure arm maintaining contact with said flapper; said closure arm maintaining exertion of a closure force on said flapper urging said flapper toward said closed position of said flapper; and said closure force of said closure arm upon said flapper being greater when said flapper is in said closed position than when said flapper is in said open position. 9. The check valve of claim 8 wherein said closure arm has a pivot end pivotably attachable relative to said valve seat and a flapper contact end at which said closure arm maintains contact with said flapper. 10. The check valve of claim 9 wherein said closure arm is biased toward a position with said flapper contact end of said closure arm forced against said flapper. 11. The check valve of claim 10 wherein a spring is coupled to said closure arm, said spring biasing said closure arm toward a position with said closure arm contacting said flapper. 12. The check valve of claim 10 wherein said flapper contact end of said closure arm contacts said flapper at a non-linear cam interface such that said closure force of said closure arm against said flapper has a non-linear relationship with a position of said flapper between said open position and said closed position. 13. The check valve of claim 12 wherein said cam interface includes a follower on said closure arm flapper contact end and a non-linear surface on said flapper against which said follower contacts. 14. The check valve of claim 13 wherein said follower includes a wheel, said wheel rotating relative to said flapper contact end of said closure arm. 15. The check valve of claim 14 wherein said non-linear surface on said flapper has a hump thereon said closure arm having a length and position which causes said flapper contact end of said closure arm to be on a first side of said hump when said flapper is in said closed position and for said flapper end of said closure arm to pass to a second side of said hump opposite said first side of said hump when said flapper pivots toward said open position. 16. The check valve of claim 12 wherein said cam interface includes a follower on said flapper and a surface on said flapper end of said closure arm upon which said follower on said flapper moves when said flapper is moving between said open position and said closed position. 17. The check valve of claim 9 wherein said flapper is pivotably attached relative to said valve seat so that said flapper pivots between said closed position and said open position. 18. The check valve of claim 17 wherein both said flapper and said closure arm pivot in a common direction about separate axes parallel to each other. 19. The check valve of claim 18 wherein both said flapper and said closure arm are pivotably coupled to a buttress attached to said valve seat. 20. The check valve of claim 19 wherein said closure arm includes a flapper end in contact with said flapper, said flapper end of said closure arm having a follower wheel thereon, said flapper including a cam surface thereon, said cam surface positioned so that said follower wheel of said flapper end of said closure arm rolls along said cam surface of said flapper. 21. A fluid flow check