Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Four-port valve and three-way valve










Image Number 13 for United States Patent #5996606.

A four-port changeover valve in an emergency water storage tank facility for changing over the flow paths of the water main and to the tank by axially moving the valve rod. Three valve seats are formed axially in a valve box. The valve rod extends through the valve seats. As the four-port changeover valve, the three valve seats can be selectively opened and closed by one and the other of two valve bodies. The water storage tank is connected to a first and a fourth chamber, while the water main is connected to a second and a third chamber. The valve rod is raised and lowered by the cylinder. In a normal state when the water pressure in the water main is at a required level, the valve rod rises so that the tank and the water main communicate with each other. In an emergency when the water pressure is low, the valve rod is pushed down by a spring, so that the one valve body is pressed against the first valve seat, while the other valve body separates from the second valve body and is seated on the third valve body. The tank is thus shut off from the water main. Also, a three-way valve for operating the changeover valve is proposed which eliminates an unstable state in which the flow direction cannot be changed over.








 
 
  Recently Added Patents
Invisible fence battery charger
White light emitting lamp and white LED lighting apparatus including the same
High order continuous time filter
Media used in digital high speed inkjet web press printing
Methods for measuring media performance associated with adjacent track interference
High density molecular memory storage with read and write capabilities
External preparation composition for skin comprising ginseng flower or ginseng seed extracts
  Randomly Featured Patents
Reinforced hose and retainer ring assembly
Systems and methods to facilitate transactions
Controller for propulsion unit, control program for propulsion unit controller, method of controlling propulsion unit controller, and controller for watercraft
Fixed solar collection system
Transfer machine tools with rotary tables
Method of and apparatus for controlling an EDM process with successively displaced magnetic field
Pointer detection apparatus and pointer detection method
Environmental wipe solvent processes
Mining method
1,2-Dithiolane derivatives