A valve assembly with a valve member coaxially received within a valve casing and interacts with the casing to provide a one-way inlet valve at one end of the valve casing and a one-way outlet valve at the other end of the casing with an annular compartment therebetween adapted to be coupled to a va
A valve assembly with a valve member coaxially received within a valve casing and interacts with the casing to provide a one-way inlet valve at one end of the valve casing and a one-way outlet valve at the other end of the casing with an annular compartment therebetween adapted to be coupled to a variable volume compartment and thereby together provide a simplified construction for valving components of a fluid pump.
대표청구항▼
1. A pump comprising: a variable volume compartment defined between a chamber-forming body and a movable member movable relative to the chamber-forming body wherein movement of the movable member changes a volume of the variable volume compartment between a first volume and a second volume different
1. A pump comprising: a variable volume compartment defined between a chamber-forming body and a movable member movable relative to the chamber-forming body wherein movement of the movable member changes a volume of the variable volume compartment between a first volume and a second volume different than the first volume,a tubular valve casing elongate along a casing axis, defining a valve chamber therein,the valve chamber having an inner wall circular in cross-section along the axis, an open inlet end and an outlet end,the inlet end to be placed into communication with an interior of an enclosed non-collapsible reservoir containing a fluid to be dispensed,a valve member coaxially located within the valve chamber,the valve member comprising a stem extending axially within the valve chamber,an inlet disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the inlet disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the outlet end towards the inlet end, the inlet disc being resiliently deflectable to be deflected from engaging the inner wall to permit fluid flow axially therepast in a direction from the inlet end towards the outlet end,an outlet disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the outlet disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the outlet end towards the inlet end, the outlet disc being resiliently deflectable to be deflected from engaging the inner wall to permit fluid flow axially therepast in a direction from the inlet end towards the outlet end,the inlet disc on the stem spaced axially away from the outlet end from the outlet disc,the outlet disc on the stem spaced axially away from the inlet end from the inlet disc,an outlet from the valve chamber spaced axially away from the inlet end from the outlet disc, the outlet in communication with a liquid discharge outlet,a fluid transfer port in communication with the variable volume compartment and open through the inner wall into the valve chamber in between the inlet disc and the outlet disc,an air seal disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the air seal disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the inlet end towards the outlet end,the air seal disc spaced axially away from the outlet end from the inlet disc,an air vent disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the air vent disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the inlet end towards the outlet end, the air vent disc being resiliently deflectable to be deflected from engaging the inner wall to permit fluid flow axially therepast in a direction from the outlet end towards the inlet end,the air vent disc spaced axially away from the outlet end from the air seal disc,an air vent port through the inner wall opening the valve chamber to the atmosphere,the air vent port on the stem axially between the air seal disc and the air vent disc,the stem having a tubular stem wall,the stem wall defining radially within the stem wall a discharge passage closed at an inner end and open at an outer end in communication with the outlet,the stem wall defining radially within the stem wall a feed passage open at an inner end in communication with the inlet end and closed at an outer end,a liquid inlet port through the stem wall into the feed passage in between the air seal disc and the inlet disc. 2. A pump as claimed in claim 1 wherein the valve member is fixed to the chamber-forming body against relative movement. 3. A pump as claimed in claim 1 wherein the valve casing and the chamber-forming body are injection molded as a unitary element. 4. A pump as claimed in claim 1 wherein: when a vacuum condition exists at the inlet end sufficient to act on the air vent disc to deflect the air vent disc from engaging the inner wall, air from the atmosphere is drawn inwardly past the air vent disc to reduce the vacuum condition with the air from the atmosphere passing via the air vent port into the valve chamber between the air seal disc and the air vent disc annularly about the stem and past the air vent disc to the inlet end. 5. A pump as claimed in claim 1 wherein the valve casing is open at the outlet end to provide the outlet, the valve stem carrying a sealing disc which engages the valve casing outwardly of the outlet disc to close the outlet end of valve chamber,a liquid discharge port through the stem wall into the discharge passage in between the outlet disc and the sealing disc. 6. A pump as claimed in claim 5 wherein: the sealing disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the sealing disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the inlet end towards the outlet end. 7. A pump as claimed in claim 5 wherein the sealing disc engages the valve casing to secure the valve casing in valve chamber against removal. 8. A pump as claimed in claim 5 wherein: movement of the movable member to increase the volume of the variable volume compartment draws the fluid from the interior of the reservoir into the variable volume compartment through the valve chamber via the inner end of the feed passage, the feed passage and the liquid inlet port to between the air seal disc and the inlet disc and then via the fluid transfer port to the variable volume compartment creating a vacuum within the valve chamber between the inlet disc and the outlet disc which vacuum acts on the inlet disc to deflect the inlet disc from engaging the inner wall permitting the fluid to be drawn inwardly from the inlet past the inlet disc,movement of the movable member to decrease the volume of the variable volume compartment discharges the fluid from the variable volume compartment through the valve chamber to the discharge outlet via the fluid transfer port to between the inlet disc and the outlet disc and then past the outlet disc to between the outlet disc and the sealing disc and via the liquid discharge port into the discharge passage to the outlet creating pressure within the valve chamber between the inlet disc and the outlet disc which pressure acts on the outlet disc to deflect the outlet disc from engaging the inner wall permitting the fluid to be discharged outwardly past the outlet disc to the outlet. 9. A pump as claimed in claim 5 wherein: when a vacuum condition exists at the inlet end sufficient to act on the air vent disc to deflect the air vent disc from engaging the inner wall, air from the atmosphere is drawn inwardly past the air vent disc to reduce the vacuum condition with the air from the atmosphere passing via the air vent port into the valve chamber between the air seal disc and the air vent disc annularly about the stem and past the air vent disc to the inlet end. 10. A pump as claimed in claim 1 wherein: movement of the movable member to increase the volume of the variable volume compartment draws the fluid from the interior of the reservoir into the variable volume compartment through the valve chamber via the inner end of the feed passage, the feed passage and the liquid inlet port to between the air seal disc and the inlet disc, past the inlet disc and then via the fluid transfer port to the variable volume compartment creating a vacuum within the valve chamber between the inlet disc and the outlet disc which vacuum acts on the inlet disc to deflect the inlet disc from engaging the inner wall permitting the fluid to be drawn inwardly past the inlet disc,movement of the movable member to decrease the volume of the variable volume compartment discharges the fluid from the variable volume compartment through the valve chamber to the discharge outlet via the fluid transfer port to between the inlet disc and the outlet disc and then past the outlet disc, into the discharge passage to the outlet creating pressure within the valve chamber between the inlet disc and the outlet disc which pressure acts on the outlet disc to deflect the outlet disc from engaging the inner wall permitting the fluid to be discharged outwardly past the outlet disc to the outlet. 11. A pump as claimed in claim 10 wherein with the discharge of fluid from the reservoir a vacuum condition created within the interior of the reservoir is relieved by air from the atmosphere being drawn into the interior of the reservoir via the air vent port into the valve chamber between the air seal disc and the air vent disc annularly about the stem and past the air vent disc to the inlet end of the valve member into the interior of the reservoir, when the vacuum condition created within the interior of the reservoir is sufficient to act on the air vent disc to deflect the air vent disc from engaging the inner wall permitting the air fluid to be drawn inwardly past the air vent disc. 12. A pump as claimed in claim 10 wherein the valve member is injection molded as a unitary element. 13. A pump as claimed in claim 12 wherein the valve casing is injection molded as a unitary element. 14. A pump as claimed in claim 10 wherein: when a vacuum condition exists at the inlet end sufficient to act on the air vent disc to deflect the air vent disc from engaging the inner wall, air from the atmosphere is drawn inwardly past the air vent disc to reduce the vacuum condition with the air from the atmosphere passing via the air vent port into the valve chamber between the air seal disc and the air vent disc annularly about the stem and past the air vent disc to the inlet end. 15. A pump as claimed in claim 14 wherein: the movable member comprises a diaphragm member sealably engaged to the chamber-forming body forming the variable volume compartment therebetween enclosed but for the transfer port,the diaphragm member, when coupled to the chamber-forming body, is deflectable between conditions including a first configuration defining the variable volume compartment to have the first volume and a second configuration defining the variable volume compartment to have the second volume;the diaphragm member being a resilient deflectable member with an inherent bias to assume an inherent unbiased condition and when deflected from the unbiased condition to return toward the unbiased condition; andthe inherent bias urges the diaphragm member to assume one of the first configuration and the second condition. 16. A pump as claimed in claim 14 wherein: the movable member comprises a bellows member sealably engaged to the chamber-forming body forming the variable volume compartment therebetween enclosed but for the transfer port. 17. A pump as claimed in claim 14 wherein: the chamber-forming body forms a piston chamber disposed about an axis and having an open end and a closed end,the movable member comprises a piston member coaxially reciprocally slidable within the piston chamber sealably engaged with the piston chamber to define the variable volume compartment within the piston chamber between the piston member and the closed end, the variable volume compartment enclosed but for the transfer port. 18. A pump as claimed in claim 14 wherein: the valve member is coupled to the chamber-forming body to permit limited relative axial movement between an axially outer position closer to the outlet end and an axially inner position farther from the outlet end,the inlet disc engaging the inner wall over a first portion of the inner wall having a first diameter,the outlet disc engaging the inner wall over a second portion of the inner wall having a second diameter less than the first diameter,wherein during movement of the movable member to change the volume of the variable volume compartment to decrease and create the pressure, the pressure forces the valve member to the axially outer position,wherein during movement of the movable member to of the variable volume compartment to increase and decrease the vacuum, the vacuum draws the valve member to the axially inner position, andwherein with movement of the valve member from the axially outer position to the axially inner position fluid between the outlet end and the discharge outlet is drawn back from the discharge outlet toward the outlet end. 19. A pump as claimed in claim 14 wherein the valve member is fixed to the chamber-forming body against relative movement.
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