Resources Contact Us Home
Liquid level control system

Image Number 3 for United States Patent #4211249.

A liquid level control system is disclosed for use with a swimming pool or the like having a pool reservoir, a main drain or outlet, usually at the bottom of the reservoir, and an outlet located at a predetermined water maintenance level for the pool. The system includes fluid amplifier means positioned relative to the pool reservoir for sensing an interface between liquid and gas, or water and air, at the surface of the water in the pool and developing a fluid pressure signal when the interface falls below a predetermined level. Liquid circulation means, including a skimmer at the surface of the water in the pool reservoir is provided for circulating water from the pool reservoir between the outlet and an inlet. A portion of the water circulated by the circulation means is channeled to the fluid amplifier means for operating the same. Fluid valve means is provided which is responsive to the fluid pressure signal developed by the fluid amplifier means. The system further includes water supply means for adding water to the pool from an external supply thereof when the fluid valve means senses the fluid pressure signal developed by the fluid amplifier means.

  Recently Added Patents
Irreversible thermochromic ink compositions
Method of bonding metallic members, and metallic bonded body
Display panel and gate driving circuit and driving method for gate driving circuit
Manufacturing process for cellular screening substratum, resultant substratum, and method and apparatus for screening
Image processing device, image forming apparatus, and non-transitory computer readable recording medium
Email certificates
Methods of forming activated carbons
  Randomly Featured Patents
Egg transfer apparatus
Belt driving device having a belt shift correcting member
Systems and methods for exposing processor topology for virtual machines
Thin film magnetic head with improved flux concentration for high density recording/playback utilizing superconductors
Consolidation of allocated memory to reduce power consumption
Toroidal electrical transformer and method of producing same
PTC element
Aqueous dispersion of aromatic polysulfone resin with perfluorocarbon resin, and coated articles
Temperature-dependent liquid metal flowrate control device
Sulfo or sulfamyl group-containing cathodic electrocoat resin