Positive flow meter
First Claim
1. A flow meter integrated within a liquid system control device including a primary flow resisting mechanism disposed within a primary channel of said liquid system control device and a bypass channel around said primary channel and said primary flow resisting mechanism, said flow meter comprising:
- a movable indicator disposed within said bypass channel, for detecting flow through said bypass channel, wherein said primary flow resisting element of said liquid system control device is a movable flow resisting mechanism having a blocking position that blocks flow through said primary channel at low levels of forward pressure differential across said primary flow resisting mechanism so that forward flows lower than a level of flow required to move said primary flow resisting mechanism from said blocking position occur entirely through said bypass channel, and wherein said movable indicator prevents any flow through said bypass channel from bypassing said movable indicator, whereby said movable indicator moves with any forward flow occurring through said liquid system control device; and
a detector for detecting a position of said movable indicator, whereby any forward flow through said liquid system control device that moves said movable indicator to a detection threshold of said detector is detected, which indicates a leakage through said liquid system control device.
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Accused Products
Abstract
A flow meter and electrically operable valve assembly having integral flow meters provide detection of very low water flows, along with ease of installation and compact packaging for a water supply control system. The flow detection is particularly useful for systems that control household water supplies to prevent flooding, but is also useful in other applications such as agricultural and industrial systems where low water flow rates must be determined. All of the controls and features are integrable within a compact package that occupies essentially the same volume and piping space as a conventional electrically operable valve.
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Citations
12 Claims
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1. A flow meter integrated within a liquid system control device including a primary flow resisting mechanism disposed within a primary channel of said liquid system control device and a bypass channel around said primary channel and said primary flow resisting mechanism, said flow meter comprising:
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a movable indicator disposed within said bypass channel, for detecting flow through said bypass channel, wherein said primary flow resisting element of said liquid system control device is a movable flow resisting mechanism having a blocking position that blocks flow through said primary channel at low levels of forward pressure differential across said primary flow resisting mechanism so that forward flows lower than a level of flow required to move said primary flow resisting mechanism from said blocking position occur entirely through said bypass channel, and wherein said movable indicator prevents any flow through said bypass channel from bypassing said movable indicator, whereby said movable indicator moves with any forward flow occurring through said liquid system control device; and
a detector for detecting a position of said movable indicator, whereby any forward flow through said liquid system control device that moves said movable indicator to a detection threshold of said detector is detected, which indicates a leakage through said liquid system control device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification