Low pressure measurement devices in high pressure environments
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Abstract
The present invention presents various novel approaches to solving the problems inherent in measuring biological pressures in high pressure systems. Thus, to protect a pressure transducer exposed to fluid flows at higher pressures than its overpressure rating, a novel valve is used that closes a protected leg in which the transducer is located. The various exemplary embodiments of such valves each have a high pressure input, one or more low pressure inputs, and an output. In operation, when a high pressure fluid flow occurs at a high pressure input, such valves automatically close the low pressure inputs. Alternatively, a novel transducer system is presented, which automatically limits the effective pressure sensed by a transducer to a certain maximum.
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Citations
47 Claims
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1-27. -27. (canceled)
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28. A fluid valve comprising:
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a first input port;
one or more additional input ports; and
an output port, wherein, when a liquid applies a pressure to the first input port that equals or is greater than a defined pressure the liquid can flow through the first input port and any path from an additional input port to the output port is blocked. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A fluid valve, comprising:
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a disc holder;
an elastomeric valve disc with a slit;
a valve body;
a first input port;
a set of one or more additional input ports; and
wherein, when the valve disc is in a closed state the first input port is isolated from the output port and the additional input ports; and
wherein, when the valve disc is in an open state the additional input ports are isolated from the output port and from the first input port, the valve disc being in the open state when a fluid pressure equaling or exceeding a defined pressure is applied to the first input port and causes the slit in the elastomeric valve disc to open. - View Dependent Claims (43, 44, 45, 46, 47)
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Specification