Nozzle/venturi with pressure differentiating bypass

A system for mixing a controlled quantity of air into a liquid flow having a variable fluid flow rate and fluid pressure, said system having a main water inlet and a main water outlet, said system comprising:

• a nozzle/venturi having a water inlet, an air inlet and an air/water mixture outlet;
• and
• a selectively adjustable pressure differentiating bypass valve having an inlet, an outlet and a fluid flow passageway therebetween, said bypass valve selectively adjustable to vary the fluid pressure necessary to open said bypass valve;
• said nozzle/venturi and said bypass valve disposed in isolated parallel arrangement with said water inlet of said nozzle/venturi and said inlet of said bypass valve fluidly communicating with said main water inlet and with said mixture outlet of said nozzle/venturi and said outlet of said bypass valve fluidly communicating with said main water outlet;
• and
• said bypass valve including poppet valve means for selectively restricting fluid flow through said passageway in accordance with the pressure differential between said water inlet and said mixture outlet of said nozzle/venturi, said poppet valve means including a valve seat, said valve head connected to adjustable means for biasing said valve head against said valve seat to vary the amount of air entrained into the water to form the air/water mixture.

A system for removing contaminants from water comprising:

• means for entraining air into the water, said means including a selectively adjustable pressure differentiating bypass valve for controlling the pressure differential between an inlet and an outlet of said means to continuously adjust the amount of air entrained into the water under varying water flow rates and pressures across said means;
• an aeration tank having an inlet fluidly communicating with said air entraining means, said aeration tank including vent means to release gases;
• and
• a filter tank having a filter medium and fluidly communicating with said aeration tank, the water passing through said filter medium to filter contaminants from the water, the filtered water being delivered to service;
• said bypass valve including adjustably biased valving means to selectively control the water flow through said bypass valve and said air entraining means to selectively control the air entrained into the water.

A system for mixing a controlled quantity of air into a liquid flow having a variable flow rate and fluid pressure, said system having a main water inlet and a main water outlet, said system comprising:

• a nozzle/venturi having a water inlet, an air inlet and an air/water mixture outlet;
• and
• a pressure differentiating bypass valve having an inlet, an outlet and a fluid flow passageway therebetween;
• said nozzle/venturi and said bypass valve disposed in parallel arrangement with said water inlet of said nozzle/venturi and said inlet of said bypass valve fluidly communicating with said main water inlet and with said mixture outlet of said nozzle/venturi and said outlet of said bypass valve fluidly communicating with said main water outlet;
• and
• said bypass valve including poppet valve means for selectively restricting fluid flow through said passageway in accordance with pressure differential between said water inlet and said water outlet of said nozzle/venturi, said poppet valve means including a valve head selectively cooperable with a valve seat to restrict fluid flow through said fluid passageway and a compression spring including means for selectively adjusting the compression force biasing said valve head towards said valve seat to vary the fluid pressure necessary to open said poppet valve means.

A system for mixing a controlled quantity of an additive fluid into a carrier fluid having a variable fluid flow rate and fluid pressure, said system having a main fluid inlet and a main fluid outlet, said system comprising:

• a nozzle/venturi having a carrier fluid inlet, an additive fluid inlet and a fluid mixture outlet;
• and
• a pressure differentiating bypass valve having a fluid inlet, a fluid outlet, and a fluid passageway fluidly connecting said fluid inlet and said fluid outlet, said fluid passageway having poppet valve means disposed therein for selectively restricting fluid flow through said fluid passageway, said poppet valve means including a valve head selectively sealing cooperating with a valve seat, said valve head connected to adjustable means for biasing said valve head against said valve seat;
• said nozzle/venturi and said bypass valve disposed in parallel arrangement with said carrier fluid inlet of said nozzle/venturi and said fluid inlet of said bypass valve fluidly communicating with said main fluid inlet and with said fluid outlet of said nozzle/venturi and said fluid outlet of said bypass valve fluidly communicating with said main fluid outlet.