초록 ▼

A jet type liquid level sensor and its combination with a fluid pressure operated valve whose opening and closing is controlled by the sensor at predetermined liquid levels within a tank in which the sensor and valve are installed. The sensor is designed for installation such that the jet stream iss

A jet type liquid level sensor and its combination with a fluid pressure operated valve whose opening and closing is controlled by the sensor at predetermined liquid levels within a tank in which the sensor and valve are installed. The sensor is designed for installation such that the jet stream issuing from a nozzle thereon travels horizontally to a receiving orifice which transmits the velocity head of the jet stream to an actuator for holding the valve open until such time that the jet stream is diffused by rising level of liquid in the tank. The nozzle has a shroud surrounding the jet stream and a pickup tube that extends a substantial distance below the nozzle. The pickup tube delivers liquid to the shroud for diffusing the jet stream when the liquid level is falling from the predetermined high shutoff level to the predetermined low reopening level corresponding to the position of the lower end of the tube at which point the jet stream is re-established for opening the valve. The high and low levels are a substantial distance apart so as to avoid frequent cycling of the valve.

대표청구항 ▼

A jet liquid level sensor comprising a body having a nozzle and a receiver, the nozzle having an inlet and a discharge orifice, the receiver having an inlet orifice and an outlet, said orifices being aligned along a substantially horizontal axis and spaced apart, a shroud extending from the nozzle b

A jet liquid level sensor comprising a body having a nozzle and a receiver, the nozzle having an inlet and a discharge orifice, the receiver having an inlet orifice and an outlet, said orifices being aligned along a substantially horizontal axis and spaced apart, a shroud extending from the nozzle beyond said discharge orifice toward said receiver, said shroud being horizontally separated from said receiver by an unobstructed space, said shroud defining a shut off chamber axially adjacent said discharge orifice through which liquid issuing from the discharge orifice passes in a substantially horizontal direction as a jet stream that is received in said receiver inlet, means to introduce liquid vertically into said shut off chamber at a flow rate insufficient to divert said jet stream from said receiver inlet, said means including a pickup tube extending from the sensor and having one end communicating laterally with said shut off chamber and having its other end radially spaced from said discharge orifice, and said shroud having open end means communicating axially with said shut off chamber to introduce liquid from said tank axially into said shut off chamber to prevent the jet stream from flowing to the receiver inlet.