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Fluid flow control device

  • US 5,007,453 A
  • Filed: 04/02/1990
  • Issued: 04/16/1991
  • Est. Priority Date: 04/19/1989
  • Status: Expired due to Fees
First Claim
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1. A flow control device insertable into a pressurized fluid line upstream of a fluid utilization device, comprising:

  • a housing containing an inlet port connectable to the fluid line, and an outlet port connectable to the utilization device;

    a normally-open valve connected to the outlet port;

    an electrical control system for closing said valve upon the occurrence of a predetermined condition;

    a power supply for supplying electrical power to said electrical control system;

    an electrical switch which is normally open to disconnect said power supply from the electrical control system;

    and a flow sensor for sensing the flow of fluid through said outlet port and effective, when significant fluid flow is sensed, to close said electrical switch and thereby to connect said power supply to the electrical control system;

    said flow sensor comprising;

    a displaceable diaphragm in said housing and defining a control chamber with a portion of the housing;

    biassing means for biassing said diaphragm in the direction of expanding said control chamber;

    a fluid connection from said outlet port to said control chamber to lower the pressure therein upon the significant flow of fluid through said outlet port, and thereby to displace said diaphragm in the direction of contracting said control chamber;

    and a switch actuator movable by said diaphragm, when moved to contract said chamber, to close said switch and thereby to connect the power supply to the electrical control system;

    said housing including a main chamber, and a liquid metering device in said main chamber controlling said electrical control system to close said valve when a predetermined quantity of fluid has flowed through said main chamber or when the fluid is flowing through said main chamber at an excessive rate.

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