Double-acting reciprocating pump assembly for use in conjunction with a melter

A double-acting reciprocating pump assembly for dispensing a fluid, comprising:

• a piston assembly comprising at least one piston disposed within at least one piston cylinder for undergoing opposite reciprocal movements within said at least one piston cylinder;
• an upper pump chamber disposed above said at least one piston, and a lower pump chamber disposed below said at least one piston;
• a fluid inlet port fluidically connected to a material supply and fluidically connected to one of said upper and lower pump chambers so as to supply fluid, to be dispensed, to said one of said upper and lower pump chambers;
• and
• a fluid outlet dispensing port defined within a lower end portion of said double-acting reciprocating pump assembly for permitting fluid to be dispensed out from said double-acting reciprocating pump assembly during both of said opposite reciprocal movements.