Safety valve
AssigneeCompair Power Tools Limited
InventorRaymond J. Hall
Life of this patent
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Abstract
A safety valve comprises a valve member which is movable against spring biasing force to close under a predetermined flow rate against valve seats and allow only a small bleed through the valve via slots. The housing consists of two parts which are adjustably connected together by a screw thread which includes a locking nut enabling the valve to be adjusted and set for operation over a range of different flow rates.
Claims14
In a safety valve for connection into a fluid pressure delivery line, said safety valve comprising a housing which includes two openings, a first of said two openings constituting an inlet and a second of said two openings constituting an outlet, a valve member within the housing operable substantially to close either of said first and second openings, means resiliently biasing the valve member to a position in which a flow path through the valve from one of said first and second openings to the other of said first and second openings is open, and means defining a restricted flow path therethrough, said valve member being movable from its said resiliently biased position to a position substantially closing off one of said first and second openings when fluid flow through the housing towards said one opening exceeds a predetermined rate, while the restricted flow path-defining means permits a bleed through said one opening, the improvement wherein said safety valve includes means for adjusting said housing to result in said movement of the valve member occurring at different flow rates, and locking means for releasably locking the housing in an adjusted position.
A safety valve for connection into a fluid pressure delivery line, said safety valve comprising
- a housing means defines an interior chamber, said housing being formed of first and second elongated housing parts which are longitudinally adjustably connected together, said first housing part providing a first opening for fluid medium to pass into or out of said interior chamber and a first valve seat which faces said interior chamber, and said second housing part providing a second opening for fluid medium to pass into or out of said interior chamber and a second valve seat which faces said interior chamber,
- a valve member positioned within said interior chamber to be movable therein so as to contact either said first valve seat or said second valve seat depending on the direction of fluid flow through said interior chamber,
- spring means positioned within said interior chamber to bias said valve to a position within said interior chamber such that it does not contact either of said first or second valve seats, and
- means for releasably locking said first and second housing parts in relative position after they have been longitudinally adjusted relative to one another, said longitudinal adjustment of said first and second housing parts determining the flow rate of fluid through said housing required to move said valve member into contact with one of said first and second valve seats.
Dependencies are inferred from the claim text.