Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Reexamination Certificate
2000-02-08
2001-02-27
Walton, George L. (Department: 3753)
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
C137S184000, C137S192000, C137S426000, C137S451000, C137S628000, C251S210000, C251S901000
Reexamination Certificate
active
06192920
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the use of a float actuated valve to maintain a given gas or liquid level.
2. Description of Prior Art
Float valves have been used for many years to control the liquid level in tanks and vessels and other liquid containing devices. The float valve typically consists of a containment vessel, an inlet port, a discharge port, a float attached to a valve fitting via an actuator arm, and a valve seat. The valve is actuated when the liquid level rises, forces the float up and opens the valve through movement of the actuator arm. These valves work by using the hydrostatic force of the float. The valves are limited in their pressure range since the force needed to actuate the valve becomes more than that available from the float as the pressure increases. The force required using a conventional float valve configuration for high pressure service would result in an excessively large, heavy containment vessel along with a large float and actuator arm.
SUMMARY
The invention is an application of a float actuated valve using multiple small valves employed in sequence to allow a relatively small float to provide the force required to open the valve even under high pressure. The opening of several small valves allows flow rates equivalent to a much larger valve.
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