Flow check valve with bias spring removal capability
AssigneeWard Aero, Inc.
InventorJoseph J. Davitt
Life of this patent
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Abstract
A spring-biased, normally open flow check valve with on-line in-service replacement capability is disclosed. A plug member which prevents reverse flow is disposed within a housing having an orifice for passing forward fluid flow through the valve. The housing is threadingly engaged on one end with a removable spring reaction support member. A helical spring is disposed within the housing for biasing the spherical plug member in a direction away from sealing the orifice. The spring reaction support member may be threadingly disengaged from the valve housing to permit removal and/or replacement of the helical spring without releasing downstream fluid pressure.
Claims1
A flow check valve with on-line in-service inspection capability comprising:
- a plug member housing having an orifice for passing forward fluid flow through said valve defined by a peripheral seat in the housing;
- said housing having a wall means with an exterior surface and an interior surface defining an interior chamber, a cylindrical exterior threaded outlet end, a hexagonal exterior middle portion, and a cylindrical exterior threaded upstream end;
- said interior chamber having a cylindrical upstream passage on one side of said seat and a cylindrical downstream passage on the other side of said seat and having a larger diameter than said upstream passage;
- said seat being a frusto-conical portion of said interior surface situated between said cylindrical upstream passage and said cylindrical downstream passage;
- said wall means having a pair of retaining pin holes on a diameter of said downstream passage, each hole passing through said wall means from said downstream passage radially outwardly to said exterior surface;
- a spherical plug member having a diameter less than the diameter of said downstream passage, disposed within said downstream passage, and adapted for sealing against said seat to block said orifice in response to reverse fluid flow through said valve;
- a solid cylindrical retaining pin disposed across the diameter of said downstream passage and received at each end within one of said retaining pin holes for retaining said plug member within said downstream passage when the plug member is displaced from said seat in response to said forward flow;
- a helical compression spring disposed within said interior chamber with one end thereof extending within said upstream passage for biasing said plug member in a direction away from said seat and toward said retaining pin;
- and
- a spring reaction support member, having a substantially cylindrical body with an exterior-threaded inlet end, a depending peripheral flange having a hexagonal exterior surface and a cylindrical inner surface threadingly engaged with said exterior-threaded upstream end of said plug member housing, and an interior cylindrical inlet passage communicating between said inlet end and said interior chamber upstream passage, said inlet passage being of smaller diameter than said upstream passage and aligned on the same longitudinal axis as said upstream passage, whereby an annular face on said spring reaction support member is defined by the area between the concentric ends of said support member inlet passage and said interior chamber upstream passage for supporting the other end of said helical compression spring.
Dependencies are inferred from the claim text.