A pressure regulator for regulating the flow of a liquid from a pressurized liquid source, the pressure regulator comprising:
- a. an inlet area;
- b. a main pressure chamber comprising
- i. a forward pressure chamber having a first end and a second end, wherein the forward pressure chamber is connected to the inlet area;
- and
- ii. a rearward pressure chamber having a first end and a second end, wherein the first end of the rearward pressure chamber is configured to be joined to the second end of the forward pressure chamber by a dividing surface, wherein the second end of the rearward pressure chamber comprises a head cap;
- c. an outlet port adjacent to the forward pressure chamber at an end opposite the rearward pressure chamber;
- d. a piston having a forward end and a rearward end and a shaft, wherein the forward end of the piston comprises a first face of the piston positioned inside the forward pressure chamber and the rearward end of the piston comprises a second face of the piston configured to be positioned inside the rearward pressure chamber, further wherein the piston is configured to slide longitudinally through the main pressure chamber, and further wherein the forward end of the piston comprises a beveled face adapted to seal against the outlet port when the piston is in a fully forward position thereby preventing the flow of liquid through the pressure chamber;
- e. a fluidic bypass fluidically connecting the rearward pressure chamber to the outlet port and the forward pressure chamber;
- f. a selector valve positioned in-line with the fluidic bypass wherein the selector valve is movable from a first position to a second position, wherein when in the first position the selector valve allows a flow of liquid only between the rearward pressure chamber and the outlet port whereby liquid may pass through the bypass even when the piston is in the fully forward position, and when in the second position the selector valve allows the flow of liquid only between the rearward pressure chamber and the forward pressure chamber whereby liquid may not pass through the bypass when the piston is in the fully forward position;
- g. a threaded shaft extending through the head cap into the rearward chamber;
- h. a wheel connected to threaded shaft, wherein the wheel is configured to be rotated, thereby rotating the threaded shaft;
- i. a movable plate positioned inside the rearward pressure chamber, wherein the movable plate is configured to prohibit the piston from sliding rearwardly through a portion of the main pressure chamber past a position of the plate in the rearward pressure chamber;
- and
- j. a plurality of guide pins connected to the head cap, wherein the guide pins are configured to prohibit the movable plate from rotating when the wheel is rotated.