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    DUAL SEALING ELEMENT VALVE FOR OIL WELL PUMPS AND METHOD OF MAKING SAME
    11.
    发明专利
    DUAL SEALING ELEMENT VALVE FOR OIL WELL PUMPS AND METHOD OF MAKING SAME 未知

    公开(公告)号：CA992525A

    公开(公告)日：1976-07-06

    申请号：CA179634

    申请日：1973-08-27

    Applicant: DRESSER IND

    Inventor： DOUGLAS BOBBY L

    IPC: B29C45/14 ,  F04B53/10 ,  F16K15/02

    Abstract: A valve body is fabricated by injecting rubber through a channel extending along the central longitudinal axis of a cylindrical body having a conical-shaped end portion and out through a pair of transverse channels to form a flexible resilient sealing surface having a flexible lip, the resilient sealing surface being formed at a slightly greater angle than the adjacent metal frusto-conical sealing surface on the body. The central and transverse channels used for injecting the rubber serve as a mechanical lock between the resilient sealing surface and the metal body of the valve. In addition, the resilient sealing surface is chemically bonded to the metal body of the valve. A plastic valve guide having a continuous ring on one end and a centrally oriented guide portion having three arcuate surfaces equally spaced around the circumference of the valve body are arranged such that the valve body can move longitudinally within the valve guide.

    OIL WELL PUMPOFF CONTROL SYSTEM UTILIZING INTEGRATION TIMER
    14.
    发明专利
    OIL WELL PUMPOFF CONTROL SYSTEM UTILIZING INTEGRATION TIMER 未知

    公开(公告)号：CA1004592A

    公开(公告)日：1977-02-01

    申请号：CA198875

    申请日：1974-05-03

    Applicant: DRESSER IND

    Inventor： DOUGLAS BOBBY L

    IPC: E21B37/06 ,  E21B47/00 ,  F04B49/02

    Abstract: A valve in the production flow line of an oil well closes a reed switch indicative of fluid being pumped through the line. The switch closure activates a first oscillator whose count is compared with a variable frequency oscillator having a frequency of approximately one-half that of the first oscillator. The comparison is made over a given period of time to ascertain the percentage of time the valve has been open and passing fluid. Theoretically, the valve should be open fifty percent of the time because fifty percent of the time is taken on the downstroke of the pumping assembly when no production is occurring. In response to the integration timer producing a signal, a shutdown timer is turned on which restarts the cycle after a preselected amount of time. When the system is restarted by the shutdown timer, a pump-up timer is turned on which is adjusted to allow for a desired pump-up time. As the pump-up timer is allowing the system to recycle, the integration timer is reset and the recycling is completed if the requirements of the integration timer are met. Otherwise, the unit is shut down again and the system recycled. A variable electronic scaler is connected to the output of the integration timer which monitors the output signals from the integrator timer. After the preset number of times the integration timer produces a signal, the scaler turns off the whole system.

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