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A fluid flow control valve includes a valve body including a side wall, an inlet port through a portion of the side wall, a top, a bottom, a discharge port centrally located in the bottom, and an interior chamber; a piston slideably mounted within the interior chamber, the piston having one end over

A fluid flow control valve includes a valve body including a side wall, an inlet port through a portion of the side wall, a top, a bottom, a discharge port centrally located in the bottom, and an interior chamber; a piston slideably mounted within the interior chamber, the piston having one end overlappingly opposing the concentric with the discharge port, the one end having a centrally located recessed portion; a sealing member removably secured to, located within, the concentric with the recessed portion of the one end of the piston for providing a fluid tight seal between the piston and a valve seat about the circumference of the discharge port whenever the piston is positioned for closure of the valve; a throttle rigidly attached to and concentric with a portion of the sealing member, the upper portion of the throttle proximate the piston being cylindrical and having an outside diameter approaching the inside diameter of the discharge port, the lower portion of the throttle including a plurality of scalloped regions; and a positioning member for selectively positioning the piston within the valve body, for obtaining a desired fluid flow rate.

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In a valve system, the combination comprising: a cylindrical valve body including a side wall, an inlet port through a portion of said side wall, a bottom with a centrally located discharge port, and an interior chamber; a valve cover secured to the top perimeter surface of said side wall of said va

In a valve system, the combination comprising: a cylindrical valve body including a side wall, an inlet port through a portion of said side wall, a bottom with a centrally located discharge port, and an interior chamber; a valve cover secured to the top perimeter surface of said side wall of said valve body, a hole being centrally located through said valve cover; a proportional solenoid rigidly attached to the top of said valve cover over said hole, responsive to the magnitude of a control signal for positioning a plunger through said hole at a desired location within said interior chamber; a piston slideably positioned within said interior chamber, said piston including a conically shaped hollowed out top portion, a centrally located through hole providing a control orifice, a raised boss-like portion concentric with said orifice hole for providing an orifice seat, said conically shaped portion serving to direct air entrapped in liquid in a control cavity formed above the top of said piston into said control orifice, said piston having an upper section including its top portion of substantial outside diameter, and a lower section of relatively less outside diameter concentric with said upper section; a throttle rigidly attached to and concentric with the bottom of said lower section of said piston, said throttle having a through hole for continuing said control orifice, the upper portion of said throttle being cylindrical and having an outside diameter approaching the inside diameter of said discharge port, the lower portion of said throttle including a plurality of scalloped regions; said lower section of said piston having a recessed portion in the bottom thereof; an O-ring located in the perimeter of said recessed portion of said lower section of said piston; a tapered disk located in said recessed portion between said throttle and said piston for retaining said 0-ring in said recessed portion; said piston further including vertical slots in the upper section of said piston for permitting fluid to flow from a central chamber formed between the side walls of said lower section and inside wall of said valve body to said control cavity, and side grooves around the circumference of said upper section for creating turbulence in said fluid for providing a liquid seal; said plunger having a sealing tip on its end, and being positionable for forcing said sealing tip against said orifice seat for causing the pressure in said control cavity to create a greater force against the top of said piston, than the force from the pressurized fluid in said central chamber, for moving the piston downward toward a valve seat formed about said discharge port below said 0-ring, tending to controllably decrease the flow rate, whereas when said plunger is moved away from said orifice seat, fluid flows from said control cavity through said control orifice into said discharge port, causing an opposite pressure imbalance for moving the piston upward away from said valve seat, thereby further opening said valve.