below this projection helps the nozzle regulator automatically deform based on backpressure in the venturi pump 115 the inlet section 420 smoothly connects the outer cylinder 400 and the inner cylinder 410 at the inlet side 430 the inlet section 420 essentially is a ring or disc having a convergent cross sectional shape along the longitudinal axis a a that joins the outer cylinder 400 and the offset inner cylinder 410 at the inlet side 430 in other words moving from the inlet side 430 to the outlet side 440 the cross sectional shape of the inlet section 420 converges this convergence can be seen by referring to fig4 where the first radius r outer at the inlet section 420 is greater than the second radius r inner at the inlet section 420 i e r outer gt r inner in a preferred embodiment shown in fig4 the convergent cross sectional shape of the inlet section 420 is a convex curve that smoothly connects the outer cylinder 400 with the inner cylinder 410 in an alternative embodiment convergent cross sectional shape of the inlet section 420 is linear such that the outer cylinder 400 and the inner cylinder 410 are smoothly connected by a straight line this embodiment is shown by the dashed convergent lines 460 connecting the outer cylinder 400 and the inner cylinder 410 at the inlet side 430 the junction of the three above sections forms a nozzle regulator cavity 450 in the nozzle regulator 105 this cavity 450 is formed by the space between the outer cylinder 400 and the inner cylinder 410 and bounded on the.