Valve device for a pump

Abstract

A pump includes a valve device ( 20 ) having a valve seat ( 21 ) and a cap ( 22 ). The valve seat ( 21 ) is mounted between a barrel ( 10 ) and a base ( 30 ) and includes a compartment ( 213 ) and a passageway ( 215 ) in communication with the compartment ( 213 ). The cap ( 22 ) is mounted in the compartment ( 213 ) and includes an opening ( 221 ) in communication with a bore ( 101 ) of the barrel ( 10 ). The cap ( 22 ) further includes a chamber ( 222 ) located intermediate and in communication with the opening ( 221 ) and the passageway ( 215 ). A disc ( 23 ) is mounted in the chamber ( 222 ) and has a thickness smaller than a height of the chamber ( 222 ). A gasket ( 234 ) is mounted to a top portion ( 231 ) of the disc ( 23 ) and has an upper edge located above the top portion ( 231 ). The gasket ( 234 ) has a sealing diameter (Ac) larger than a diameter of the opening ( 221 ) of the cap ( 22 ) and larger than a thickness of the disc ( 23 ).

1 . A pump comprising:
 a base including an engagement section, with a nozzle adapted to be coupled to the base;   a barrel engaged with the engagement section of the base, with the barrel having a bore;   a piston rod including an upper end outside of the barrel and a lower end received in the bore of the barrel, with a handle mounted to the upper end of the piston rod, with a piston mounted to the lower end of the piston rod;   a valve device including a valve seat and a cap, with the valve seat mounted between the barrel and the engagement section of the base, with the valve seat including a compartment and a passageway in communication with a lower end of the compartment, with the cap mounted in the compartment and including an opening in communication with the bore of the barrel, with the cap further including a chamber located intermediate and in communication with the opening of the cap and the passageway of the valve seat, with a disc mounted in the chamber and having a thickness smaller than a height of the chamber, with a spring mounted in the passageway of the valve seat and located between the base and a bottom end of the disc, biasing the disc towards the opening of the cap, with the disc including a top portion, at least one channel, and at least one abutting portion, with a gasket mounted to the top portion of the disc, with the gasket having an upper edge located above the top portion of the disc, with the gasket having a sealing diameter, with the sealing diameter being a spacing between two centers respectively of two circles on a cross-sectional plane including a central line of the gasket, with the sealing diameter larger than a diameter of the opening of the cap and larger than the thickness of the disc.   
     
     
         2 . The pump as claimed in  claim 1 , with the engagement section of the base including a fixing portion at a lower end thereof, with the fixing portion including a port, with the port adapted to be in communication with the nozzle, with the fixing portion including a plurality of holes. 
     
     
         3 . The pump as claimed in  claim 2 , further comprising a hose mounted between the port and the nozzle. 
     
     
         4 . The pump as claimed in  claim 1 , with the valve seat including an annular groove in an outer periphery thereof, with an O-ring received in the annular groove and in sealing contact with an inner periphery of the bore. 
     
     
         5 . The pump as claimed in  claim 2 , with the valve seat including an outer threading, with the barrel including a lower end having an inner threading threadedly engaged with the outer threading of the valve seat, with the valve seat including a plurality of screw holes aligned with the plurality of holes of the fixing portion, with a plurality of screws extending through the plurality of holes of the fixing portion into the plurality of screw holes, fixing the valve seat in the engagement section of the base. 
     
     
         6 . The pump as claimed in  claim 1 , with the cap including an outer threading, with the compartment of the valve seat including an inner threading, with the outer threading of the cap threadedly engaged with the inner threading of the compartment. 
     
     
         7 . The pump as claimed in  claim 6 , further comprising: an O-ring mounted to an upper end of an outer periphery of the cap, providing airtight contact between the outer periphery of the cap and an upper end of an inner periphery of the compartment of the valve seat. 
     
     
         8 . The pump as claimed in  claim 1 , with said at least one channel formed in an outer periphery of the disc for guiding air currents from the opening to the passageway, with said at least one abutting portion including at least one protrusion formed on the bottom side of the disc and defining at least one air passageway, with the spring abutting said at least one protrusion, with the air currents from the opening flowing through said at least one channel and said at least one air passageway into the passageway of the valve seat during an inflation stroke of the pump. 
     
     
         9 . The pump as claimed in  claim 1 , with the disc including a maximum diameter, with the maximum diameter of the disc larger than the sealing diameter of the gasket.