Patents Assigned to Irro-Controls Group
  • Moisture and pressure sensitive fluid control circuit
    Patent number: 4938248
    Abstract: A control circuit includes one or more pressure activated fluid flow valves and one or more moisture and pressure sensitive controllers. Each controller includes a body with three chambers separated by movable diaphragm assemblies, one of which moves in response to changes in pressure exerted by the amount of moisture or fluid in the environment. Responsively, a passageway through the other diaphragm allows the passage of fluid and thus venting of the flow valves when a low moisture or fluid condition is detected.
    Type: Grant
    Filed: May 3, 1988
    Date of Patent: July 3, 1990
    Assignee: Irro-Controls Group
    Inventor: Christopher L. Browne
  • Self-servicing hydraulic tensiometer with electrical switching and response capabilities
    Patent number: 4922945
    Abstract: A hydraulic tensiometer includes a pressure-sensitive electrical switch which acts to control an irrigation system in response to changes in matric water potential. Three chambers are defined in the tensiometer by moveable diaphragms. Two of the chambers are not in communication with the tensiometer probe, but are interconnected by a passageway. Flow through the passageway is controlled by an electrically operated valve.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: May 8, 1990
    Assignee: Irro-Controls Group
    Inventor: Christopher L. Browne