Jerry Len Nichols

US Patent:

50627708, Nov 5, 1991

Filed:

Aug 11, 1989

Appl. No.:

7/393142

Inventors:

Carl E. Story - Cupertino CA
Jerry A. Nichols - San Jose CA
Byron C. Cady - Gilroy CA

Assignee:

Systems Chemistry, Inc. - Milpitas CA

International Classification:

F04B 4306

US Classification:

417 46

Abstract:

A fluid pumping apparatus and system including a double acting diaphragm pumping device in which each pumping component has a pair of spaced apart diaphragms defining a containment chamber and all exposed surfaces in the pumping chamber and the containment chamber are made of an inert plastic material, a fluid sensor extending into each containment chamber for sensing the presence of unwanted fluids therein, and a pump control system for activating the pumping apparatus and responding to an output signal generated by either sensor to deactivate the pumping apparatus in the event of leakage of fluid into either containment chamber.

US Patent:

49017519, Feb 20, 1990

Filed:

Jun 15, 1989

Appl. No.:

7/366729

Inventors:

Carl E. Story - Cupertino CA
Jerry A. Nichols - San Jose CA
Byron C. Cady - Gilroy CA

Assignee:

Systems Chemistry, Inc. - Milpitas CA

International Classification:

G01M 308
G01M 338
F16K 3700
F16K 5100

US Classification:

137312

Abstract:

A fluid control valve with leak detection and containment features for use in a fluid handling system incorporating one or more flow controlling devices each including: an actuator; a weir valve and associated valve housing; and a pair of spaced apart diaphragms, one of which serves as the closure member for the weir valve and the other providing a secondary seal defining the limits of a containment chamber for at once preventing contamination of the controlled fluid, protecting the actuating mechanism and allowing immediate detection of valve closure failure. A piston member disposed within the chamber is coupled to the two diaphragms, and a fluid detection device is disposed in communication with a sealed containment chamber formed between the two diaphragms. The system includes electronic control apparatus responsive to the detection device and is operative to instantaneously shut down the system in the event of a detected failure.