US 4,382,577 A · Shut-off valve for liquid or gaseous fluids

Abstract

A valve housing with a horizontal partition between an inlet port and an outlet port coacts with a hollow plunger which is vertically displaceable above that partition and has a lower end fitting into an aperture thereof traversed in an upward direction by an incoming fluid. The plunger is guided in a surrounding sleeve threadedly connected at its bottom with the valve housing and at its top with a cap having a boss traversed by a stem which is integral with a control handle threaded onto that boss. The lower end of the stem adjoins an elastic membrane which is clamped between the cap and the sleeve and which bounds a fluid space above an end wall of the sleeve; this space permanently communicates via channels in the sleeve and external flutes in the plunger with the outlet port of the housing and is further connected through a tubular neck of that end wall with the interior of the plunger and thus with the inlet port when the membrane is lifted off this neck. In such a case the pressure of the incoming fluid, acting upon an internal shoulder of the plunger, raises the latter off the partition to establish a direct flow path between the two ports. When the stem is lowered to let the membrane obstruct the neck of the sleeve wall, the plunger returns by hydraulic pressure to its flow-blocking position.

Claims8

Dependent claims

A shut-off valve for controlling the flow of a fluid between two conduits, comprising:

a housing with an inlet port and an outlet port respectively connectable to said conduits, said ports being separated in said housing by a partition having an aperture positioned to be traversed by the fluid from a first side to a second side;
a plunger guided in an extension of said housing on said second side of said partition, said plunger having an extremity partly receivable in said aperture for fluidically isolating said ports from each other in a cut-off position, said plunger further having a throughgoing axial bore with an internal constriction;
a transverse wall in said extension beyond said plunger, said wall having a passage in line with said bore opening into a space beyond said wall, said space communicating with said outlet port via a bypass independent of said aperture including at least one channel in said extension and a set of external flutes on said plunger which open onto said extremity outside the circumference of said aperture whereby incoming fluid entering said bore from said inlet port through said aperture and reaching said outlet port by way of said channel creates a pressure differential across said internal constriction tending to move said plunger off said partition and establishing a direct connection between said ports;
and
blocking means in said space operable to throttle said passage for allowing a return of said plunger to said cut-off position by a hydraulic pressure permanently acting thereon.

2 more elements

A shut-off valve for controlling the flow of a fluid between two conduits, comprising:

a housing with an inlet port and an outlet port respectively connectable to said conduits, said ports being separated in said housing by a partition having an aperture positioned to be traversed by the fluid from a first side to a second side;
a plunger guided in a sleeve forming an extension of said housing on said second side of said partition, said plunger having an extremity partly receivable in said aperture for fluidically isolating said ports from each other in a cut-off position, said plunger further having a throughgoing axial bore with an internal constriction;
a transverse wall in said extension beyond said plunger, said wall being provided with a tubular neck forming a passage in line with said bore opening into a space beyond said wall, said space communicating with said outlet port via a bypass independent of said aperture including at least one channel in said sleeve, said neck being surrounded by an annular depression communicating with said channel whereby incoming fluid entering said bore from said inlet port through said aperture and reaching said outlet port by way of said channel creates a pressure differential across said internal constriction tending to move said plunger off said partition and establishing a direct connection between said ports;
an end cap threadedly secured to said sleeve and provided with a tubular boss;
and
blocking means in said space operable to throttle said passage for allowing a return of said plunger to said cut-off position by a hydraulic pressure permanently acting thereon, said blocking means including a flexible membrane clamped between said sleeve and said end cap, a stem axially slidable in said boss on the side of said membrane opposite said neck and a handle with a hub threaded onto said boss in contact with said stem for optionally deflecting said membrane by means of said stem onto said neck.

3 more elements

Dependencies are inferred from the claim text.

Shut-off valve for liquid or gaseous fluids

Life of this patent

Shut-off valve for liquid or gaseous fluids

Life of this patent

Abstract

Claims8