A valve assembly for a fuel pump and having: a one-way outlet closing valve, which only allows fuel to flow out; a one-way pressure relief valve, which only allows fuel to flow in; a connector, which has a housing on the inside; and a valve disc, which engages the housing of the connector and has a plurality of through outlet holes and a through relief hole. A shutter of the outlet closing valve consists of a flexible sheet, which is fixed to the valve disc and has: a plurality of shutting portions arranged in the area of the outlet holes; a peripheral mounting portion with an annular shape; a plurality of outer connection portions, each connecting the peripheral mounting portion to a corresponding shutting portion; a central mounting portion; and a plurality of inner connection portions, each connecting the central mounting portion to a corresponding shutting portion.

A valve assembly for a fuel pump and having: a one-way outlet closing valve, which only allows fuel to flow out; a one-way pressure relief valve, which only allows fuel to flow in; a connector, which has a housing on the inside; and a valve disc, which engages the housing of the connector and has a plurality of through outlet holes and a through relief hole. A shutter of the outlet closing valve consists of a flexible sheet, which is fixed to the valve disc and has: a plurality of shutting portions arranged in the area of the outlet holes; a peripheral mounting portion with an annular shape; a plurality of outer connection portions, each connecting the peripheral mounting portion to a corresponding shutting portion; a central mounting portion; and a plurality of inner connection portions, each connecting the central mounting portion to a corresponding shutting portion.

Embodiments of a flow control apparatus of the present invention generally include a vessel equipped with a pre-filter assembly, a substantially vertical, bottom-feeding liquid inlet line, a vapor space pressure equalization line, and a liquid outlet, wherein the vessel contains a pair of connected, horizontally oriented, O-ring and/or piston ring equipped sealing plates that are designed to rise and fall as a pair in response to gravity provided liquid pressure in the sump of the vessel, whereby an elevation of the sealing plates provides the liquid in fluid communication with the liquid outlet via internal orifices fluidly connected to one or more fluid conduits. Embodiments of a method of using embodiments of an apparatus of the present invention to control liquid flow are also provided.

Embodiments of a flow control apparatus of the present invention generally include a vessel equipped with a pre-filter assembly, a substantially vertical, bottom-feeding liquid inlet line, a vapor space pressure equalization line, and a liquid outlet, wherein the vessel contains a pair of connected, horizontally oriented, O-ring and/or piston ring equipped sealing plates that are designed to rise and fall as a pair in response to gravity provided liquid pressure in the sump of the vessel, whereby an elevation of the sealing plates provides the liquid in fluid communication with the liquid outlet via internal orifices fluidly connected to one or more fluid conduits. Embodiments of a method of using embodiments of an apparatus of the present invention to control liquid flow are also provided.

A bi-directional valve has an inlet with an outlet that may interchangeably applied to a pressure source and still operate properly. A spring applies a bias to a concave diaphragm against a cover plate in a non-relieving configuration to seal an inlet relative to an outlet. The cover plate may have ports with a shallower attack angle than prior art designs. Those ports may also have different shapes to facilitate significantly more flow permitting at least some better performance characteristics than prior art designs.

A bi-directional valve has an inlet with an outlet that may interchangeably applied to a pressure source and still operate properly. A spring applies a bias to a concave diaphragm against a cover plate in a non-relieving configuration to seal an inlet relative to an outlet. The cover plate may have ports with a shallower attack angle than prior art designs. Those ports may also have different shapes to facilitate significantly more flow permitting at least some better performance characteristics than prior art designs.

The invention is directed to a one-way valve for a flexible package which comprises a first film layer having at least one first cut line and a second film layer having at least one second cut line, wherein the lines are offset from one another. An adhesive layer is disposed between the film layers. The film layers and the adhesive layer define a valve area wherein the first film layer and the second film layer are not permanently adhered to each other. The second cut line fluidly connects the interior of the flexible package to the valve area and the first cut line fluidly connects the valve area to the ambient atmosphere surrounding the flexible package. The adhesive pattern within the valve area creates a gas flow channel from the second cut line toward the first cut line.

A pressure bleed-off module for an oil well includes: an inlet receiving fluid from an annulus vent of the well; an outlet sending the received fluid to a kill valve of the well; and two paths coupled in parallel between the inlet and the outlet. Each path channels a flow of the received fluid from the inlet to the outlet and includes: a pressure relief valve dividing the path into an inlet side coupled to the inlet and an outlet side coupled to the outlet, opening when the pressure of the fluid in the inlet side exceeds a threshold, and closing when the inlet fluid pressure is below the threshold; pressure gauges measuring the inlet fluid pressure and the pressure of the fluid in the outlet side; a pressure recorder recording the measured inlet and outlet fluid pressures; and a sampling point for draining the fluid in the outlet side.

A pressure bleed-off module for an oil well includes: an inlet receiving fluid from an annulus vent of the well; an outlet sending the received fluid to a kill valve of the well; and two paths coupled in parallel between the inlet and the outlet. Each path channels a flow of the received fluid from the inlet to the outlet and includes: a pressure relief valve dividing the path into an inlet side coupled to the inlet and an outlet side coupled to the outlet, opening when the pressure of the fluid in the inlet side exceeds a threshold, and closing when the inlet fluid pressure is below the threshold; pressure gauges measuring the inlet fluid pressure and the pressure of the fluid in the outlet side; a pressure recorder recording the measured inlet and outlet fluid pressures; and a sampling point for draining the fluid in the outlet side.

The invention is directed to a one-way valve for a flexible package which comprises a first film layer having at least one first cut line and a second film layer having at least one second cut line, wherein the lines are offset from one another. An adhesive layer is disposed between the film layers. The film layers and the adhesive layer define a valve area wherein the first film layer and the second film layer are not permanently adhered to each other. The second cut line fluidly connects the interior of the flexible package to the valve area and the first cut line fluidly connects the valve area to the ambient atmosphere surrounding the flexible package. The adhesive pattern within the valve area creates a gas flow channel from the second cut line toward the first cut line.