Portable differential pressure generator
First Claim
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1. A portable pressure differential generating system comprising:
- a portable flow accelerator having a passage therethrough, said passage having a high pressure region with a first cross sectional area and a low pressure region with a second cross sectional area, the first cross sectional area being larger than the second cross sectional area, said accelerator further including;
an accelerator low pressure tap in fluid connection with the low pressure region of the flow accelerator, said low pressure tap adapted for fluid connection with a low pressure port of a pressure measuring device;
an accelerator high pressure tap in fluid connection with the high pressure region of the flow accelerator;
said high pressure tap adapted for fluid connection with a high pressure port of a pressure measuring device;
a portable pump in fluid connection with the passage in the flow accelerator; and
a valve disposed between and in fluid communication with the flow accelerator and the pump, the valve having an upstream side and a downstream side defined by the direction of fluid flow through the valve;
a valve low pressure tap in fluid connection with the downstream side of the valve; and
a valve high pressure tap in fluid connection with the upstream side of the valve;
a range selection device for selecting either a first pressure differential across the accelerator low pressure tap and the accelerator high pressure tap or a second pressure differential across the valve through the valve low pressure tap and the valve high pressure tap.
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Abstract
A dual range dynamic pressure differential generator for use at low pressures using a differential over a variable valve for a first stage pressure differential and the differential over a flow accelerator for a second stage pressure differential. The differential over the variable valve is useful for higher pressure differentials while the differential created over the flow accelerator is useful for a lower range pressure differential, although the two ranges may overlap.
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Citations
15 Claims
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1. A portable pressure differential generating system comprising:
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a portable flow accelerator having a passage therethrough, said passage having a high pressure region with a first cross sectional area and a low pressure region with a second cross sectional area, the first cross sectional area being larger than the second cross sectional area, said accelerator further including; an accelerator low pressure tap in fluid connection with the low pressure region of the flow accelerator, said low pressure tap adapted for fluid connection with a low pressure port of a pressure measuring device; an accelerator high pressure tap in fluid connection with the high pressure region of the flow accelerator;
said high pressure tap adapted for fluid connection with a high pressure port of a pressure measuring device;a portable pump in fluid connection with the passage in the flow accelerator; and a valve disposed between and in fluid communication with the flow accelerator and the pump, the valve having an upstream side and a downstream side defined by the direction of fluid flow through the valve; a valve low pressure tap in fluid connection with the downstream side of the valve; and a valve high pressure tap in fluid connection with the upstream side of the valve; a range selection device for selecting either a first pressure differential across the accelerator low pressure tap and the accelerator high pressure tap or a second pressure differential across the valve through the valve low pressure tap and the valve high pressure tap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portable pressure calibration system comprising:
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a handheld measurement module having a pressure differential sensor with a high pressure input and a low pressure input; a pressure differential generating module associated with said handheld measurement module, said pressure differential generating module comprising; a portable flow accelerator having a passage therethrough, said passage having a high pressure region with a first cross sectional area and a low pressure region with a second cross sectional area, the first cross sectional area being larger than the second cross sectional area, said accelerator further including; an accelerator low pressure tap in fluid connection with the low pressure region of the flow accelerator, said low pressure tap adapted for fluid connection with the low pressure input of the handheld measurement module; an accelerator high pressure tap in fluid connection with the high pressure region of the flow accelerator;
said high pressure tap adapted for fluid connection with the low pressure input of the handheld measurement module;a portable pump in fluid connection with the passage in the flow accelerator; a valve disposed between and in fluid communication with the flow accelerator and the pump, the valve having an upstream side and a downstream side defined by the direction of fluid flow through the valve; a valve low pressure tap in fluid connection with the downstream side of the valve; a valve high pressure tap in fluid connection with the upstream side of the valve; and a range selection device for selecting either a first pressure differential across the accelerator low pressure tap and the accelerator high pressure tap or a second pressure differential across the valve through the valve low pressure tap and the valve high pressure tap. - View Dependent Claims (12, 13, 14, 15)
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Specification