Trigger type sprayer

A liquid dispensing pump, comprising a pump body adapted to be mounted on a container of flowable product to be dispensed, said body having a pump cylinder, a piston reciprocable in said cylinder and therewith defining a variable volume pump chamber, said pump body having valve-controlled inlet and outlet means for delivering liquid product into and out of said pump chamber, means for manually reciprocating said piston, a nozzle cap having a discharge orifice and being mounted for rotation between a discharge closed position and at least two selective discharge open positions without axial displacement on said pump body at the end of said outlet means, an element disposed within said nozzle cap and mounted on said pump body, said nozzle cap having an inner surface, and said element comprising a housing having an outer surface spaced from said inner surface to therewith define a circular spin chamber, a wall of said nozzle cap engaging a wall of said housing, said cap wall having at least two spaced apart tangential openings at said inner surface leading into said spin chamber, said housing wall having at least two spaced apart supply channels, said openings and said channels solely comprising discharge flow path means and being relatively arranged such that upon rotation of said cap into said discharge closed position said openings and said channels are mismatched, upon rotation of said cap into a first of said discharge open positions one of said channels and one of said openings are matched, and upon rotation of said cap into a second of said discharge open positions of both of said channels and both of said openings are matched, whereby the liquid product is discharged through said discharge orifice at an essentially constant discharge capacity solely via said tangential openings at a swirl velocity and in a pattern range depending on said discharging open positions.