Self-Sealing Mixing Valve
Patent, Filed 17 Apr 96, patented 2 Jun 98
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A self sealing venturi type mixing valve for mixing a polymer with water as it is being dispensed. A hollow piston is slidably mounted in the valve body. Water flows through the piston and into a venturi tube causing the water flow to become turbulent. A circumferential slot connected to a polymer reservoir surrounds the downstream end of the piston. The piston is spring loaded within the valve such that its downstream end seals against the portion of the valve body forming the throat of the venturi tube, also sealing the slot from the venturi tube. When polymer flow is started, the pressure of the polymer pushes the piston away from the throat, allowing polymer to flow into the tube and mix with the water. When the polymer flow is shut off, the spring loaded piston closes off the slot. Any polymer remaining in the slot is sealed off from contact with water, thus preventing clogging of the valve. The travel of the piston, and thus the site of the slot opening, can be changed by adjusting the location of the piston stop.
- Pumps, Filters, Pipes, Tubing, Fittings and Valves