Fluid dispenser valve

In a push-in fluid dispenser having a fluid storage container and a plunger carried in said container, with said plunger being manually pushable inward for dispensing fluid from said container, the improvement comprising in combination:

• a valve cylinder including means for mounting said cylinder in said container, said cylinder having an inner opening and an interior passage for slidingly receiving said plunger,
• with said plunger having a fluid flow passage therein providing a flow path from the interior of said cylinder to the exterior of said dispenser and having an outer end for engagement by an operator;
• first and second one-way valves, with said first one-way valve disposed for control of fluid flow into said interior of said cylinder through said inner opening and with said second one-way valve disposed for control of fluid flow from said interior into said plunger passage, said first one-way valve comprising a disc assembly of a relatively rigid washer with a central opening, and a relatively flexible resilient seal having an annular rim enclosing said washer and a central flapper joined to said rim and overlying said washer central opening;
• spring means engaging said cylinder and plunger for urging said plunger outward away from said cylinder inner opening;
• and
• interengaging stop means in said cylinder and plunger for limiting outward movement of said plunger;
• with an inward force on said plunger moving said plunger inward compressing said spring means and forcing fluid from said interior of said cylinder out said plunger passage through said second one-way valve, and with said spring means moving said plunger outward drawing fluid from said container into said interior of said cylinder through said inner opening and first one-way valve,
• said first one-way valve being a self-contained head holding valve with said washer having a projecting annular shoulder at said central opening, with said flapper engaging said shoulder.

In a push-in fluid dispenser having a fluid storage container and a vertically oriented plunger carried in said container, with said plunger being manually pushable inward for dispensing fluid from said container, the improvement comprising in combination:

• a valve cylinder including means for mounting said cylinder in said container, said cylinder having an inner opening and an outer sleeve mounted in said container and an inner sleeve slidably inserted into said outer sleeve, with said plunger sliding in said inner sleeve, and an outlet nozzle joining said inner and outer sleeves and forming the outlet portion of said flow path,
• with said plunger having a fluid flow passage therein providing a flow path from the interior of said cylinder to the exterior of said plunger within said inner sleeve and through said outlet nozzle to the exterior of said dispenser and having an outer end for engagement by an operator;
• an interengaging sliding seal between said plunger exterior and said inner sleeve interior, with said plunger fluid flow passage including an upstream axial section passing said sliding seal and a downstream lateral section outboard of said sliding seal, with said flow path through said axial section, said lateral section and out between said plunger and cylinder and with said seal positioned to provide sealing between said plunger and inner sleeve around said flow path on said exterior of said plunger for the entire movement of said plunger between outward and inward limited positions;
• first and second one-way valves, with said first one-way valve disposed for control of fluid flow into said interior of said cylinder through said inner opening and with said second one-way valve disposed for control of fluid flow from said interior into said plunger passage, said first one-way valve comprising a disc assembly of a relatively rigid washer with a central opening, and a relatively flexible resilient seal having an annular rim enclosing said washer and a central flapper joined to said rim and overlying said washer central opening;
• spring means engaging said cylinder and plunger for urging said plunger outward away from said cylinder inner opening;
• and
• interengaging stop means in said cylinder and plunger for limiting outward movement of said plunger and with engagement of said plunger with said cylinder limiting inward movement of said plunger;
• with an inward force on said plunger moving said plunger inward compressing said spring means and forcing fluid from said interior of said cylinder out said plunger passage through said second one-way valve, and with said spring means moving said plunger outward drawing fluid from said container into said interior of said cylinder through said inner opening and first one-way valve.