Patent ID: 8091575
Filing Date: 2012-01-10
Classification: G05D,Y10T

Abstract:
1. A valve system for monitoring and controlling a flow of a fluid additive into a main fluid line comprising: a fluid reservoir adapted to contain the fluid additive; a supply conduit providing fluid communication between the reservoir and the main fluid line; a pump adapted to cause a continuous and uninterrupted flow of the fluid additive from the reservoir through the supply conduit to the main fluid line; a first valve to selectively prevent the flow of the fluid additive into the main fluid line, the first valve disposed along the supply conduit and being normally opened; at least one return conduit providing fluid communication from the supply conduit to the reservoir, the return conduit including an orifice restriction; a second valve to selectively prevent the flow of fluid additive through the return conduit, the second valve disposed along the return conduit and being normally closed, the orifice restriction disposed between the supply conduit and the second valve; a first flow meter disposed in the supply conduit adapted to detect a flow rate of the fluid additive into the main fluid line; a second flow meter disposed in the main fluid line adapted to detect a fluid flow rate within the main fluid line; and means for controlling the pump, the first valve, and the second valve, wherein a signal from the first flow meter and a signal from the second flow meter are effective to control the operation of the pump, the first valve, and the second valve to maintain a desired flow of the fluid additive into the main fluid line.