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
Coaxial probe
Laser-marked multi-component assemblies, kits, and related methods
Cap which utilizes an airfoil effect for inducing cooling
Industrial turbine blade with platform cooling
Discovery of security associations for key management relying on public keys
Microfluidic device for inducing separations by freezing and associated method
Communications module apparatus, integrated circuit and method of communicating data
  Randomly Featured Patents
Apparatus and methods for sealing a vascular puncture
Vehicle navigation apparatus proving proper guidance for off-road net conditions
Electrical connector with improved grounding structure for shielding shell thereof
Differential gradient separation of cells
Fuse and application of said fuse to the construction of an emergency shutdown system for a nuclear reactor
Method for the production of a heat-sensitive record material
Tether for holding promotional materials
Prefabricated collapsible awning frame system
Suspended load container