Flow control valve

A valve comprising:

• a valve housing having an inlet, an outlet, and a valve chamber therein, the valve chamber having a first valve port opening in communication with the inlet and a second valve port opening in communication with the outlet;
• a modulating member disposed in the chamber approximate the first valve port opening and second valve port opening, the modulating member having a central aperture, and a first tapered arcuate slot and second tapered arcuate slot encircling the central aperture, where the modulating member is capable of being rotated about the central aperture for positioning a portion of the first tapered arcuate slot over the first valve port opening and a portion of the second tapered arcuate slot over the second valve port opening, wherein rotation of the modulating member adjustably positions a wider or narrower portion of both the first tapered arcuate slot and second tapered arcuate slot over the first valve port opening and second valve port opening respectively, to adjustably vary the rate of fluid flow through the first valve port opening and second valve port opening, wherein when fluid pressure at the inlet is greater than the fluid pressure at the outlet, the valve permits fluid flow from the inlet through the first valve port opening and first tapered arcuate slot into the valve chamber, and out through the second tapered arcuate slot and second valve port opening to the outlet, the flow rate of which is controlled by the rotational position of the first and second tapered arcuate slots relative to the first and second valve port openings respectively;
• and
• a two-way check valve comprising a converging-diverging passageway having first and second end portions, each end portion of which has a check ball retained therein, each check ball being configured to block the converging-diverging passageway to restrict fluid flow through the converging-diverging passageway when exposed to a pressure differential across the inlet and outlet of at least 5 psi.

A valve comprising:

• a valve housing having an inlet, an outlet, and a valve chamber therein, the valve chamber having a first valve port opening in communication with the inlet and a second valve port opening in communication with the outlet;
• a modulating member disposed in the chamber approximate the first valve port opening and second valve port opening, the modulating member having a central aperture, and a first tapered arcuate slot and a second tapered arcuate slot encircling the central aperture, the modulating member being configured to rotate about the central aperture for positioning a portion of the first tapered arcuate slot over the first valve port opening and a portion of the second tapered arcuate slot over the second valve port opening, where rotation of the modulating member adjustably positions a wider or narrower portion of both the first tapered arcuate slot and second tapered arcuate slot over the first valve port opening and second valve port opening respectively, to adjustably vary the flow rate through the first valve port opening and second valve port opening;
• a two-way check valve disposed between the inlet and the outlet of the valve housing, the two-way check valve including a converging-diverging passageway, each end portion of which has a check ball retained therein;
• and
• a motor having a shaft coupled to the modulating member's central aperture for adjustably rotating the modulating member to controllably adjust the rate of fluid flow through the first and second valve pod openings.