David R Clay

US Patent:

50883836, Feb 18, 1992

Filed:

Jan 22, 1990

Appl. No.:

7/468353

Inventors:

John W. Wardle - Roscoe IL
Plato J. Leeson - Rockford IL
David G. Clay - Rockford IL
Dale W. Sievert - Freeport IL

Assignee:

Woodward Governor Company - Rockford IL

International Classification:

F15B 907
F15B 909

US Classification:

91361

Abstract:

A multiplexed hydraulic control system which avoids the use of a rotary multiplexer and thereby allows for random selection of the multiplexed outlet ports and variable dwell times for the respective ports. A single hydraulic input is multiplexed among a plurality of hydraulic outputs. A control system provides two types of signals: (1) modulation signals selected from a plurality of multiplexed input signals for producing a modulating hydraulic flow, and (2) selector signals for operating on the multiplexer means to route the modulated signal to the appropriately selected channel.

US Patent:

50799304, Jan 14, 1992

Filed:

Dec 3, 1990

Appl. No.:

7/621609

Inventors:

David W. Beaverson - Bowling Green OH
David A. Clay - Perrysburg OH

Assignee:

Atron, Inc. - Toledo OH

International Classification:

F25B 4902

US Classification:

62129

Abstract:

A flash gas filter system detects a low level of refrigerant flowing in a conduit of a refrigeration system by measuring a temperature drop across a sub-cooler connected to the conduit. The sub-cooler has a liquid process circuit for passing the refrigerant and a refrigerating circuit connected by a manual expansion valve to an outlet of the liquid process circuit for producing a predetermined temperature drop across the sub-cooler when the refrigeration system is fully charged. The temperature drop in the refrigerant is reduced by the presence of bubbles caused by a low refrigerant level. The reduced temperature drop is detected and an alarm signal is generated by a computerized filter system control. The control also can monitor liquid line temperature for protection against malfunctioning condensers generate maintenance information and warn of potential malfunction conditions.