Fluid dispensing mechanism for fluid dispenser

A fluid dispensing mechanism comprising:

• a housing;
• a pump set mounted in said housing, said pump set comprising a pump body and a piston tube, said pump body being a hollow member having a forwardly extending center tube extending out of said housing for the mounting of a valve set and a valve port at a top end of said center tube, said piston tube having a top piston skirt, which is compressible in said pump body, and a bottom outlet;
• a valve set, said valve set comprising a valve tube inserted into said piston tube of said pump set, said valve tube having a conical valve port formed in a bottom end thereof and a plurality of supporting lugs arranged around the periphery thereof, a valve stem axially movably inserted through said valve tube, said valve stem having a barbed front tip suspended in the center tube of said pump body and a conical head for controlling the passage of the conical valve port of said valve tube, a flow guide mounted inside said pump body, said flow guide having a top rim, a plurality of longitudinal slots spaced around the periphery thereof, and an annular bottom inside flange hooked up with the barbed front tip of said valve stem, a spring member vertically sleeved onto said valve stem and said flow guide, said spring member having a bottom end stopped against a top side of said valve tube and a top end stopped against the top rim of said flow guide, and a steel ball mounted in a top side of said flow guide corresponding to the valve port of said pump body;
• and
• a button for pressing by the user to move said piston tube axially to further drive said valve set to suck in and force out a predetermined amount of a fluid, said button comprising a tubular shank connected to a bottom end of said piston tube, said tubular shank having a bottom nozzle hole for output of the fluid passing out of said valve set.