# US 5,708,210 A · Pressure monitoring isolating device

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- Number: US 5,708,210 A
- Document ID: US5708210A
- Status: Granted
- Kind: A
- Application number: 08/614,215
- Filed: 1996-03-12
- Granted: 1998-01-13
- Earliest claimed: 1996-03-12
- Inventors: David Gardellin
- Web page: https://patentgrep.com/patent/US5708210A

## CPC

- G01L 19/0023: {for flowthrough systems having a flexible pressure transmitting element}
- G01L 19/0645: {using isolation membranes, specially adapted for protection}
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A pressure monitoring isolating device for monitoring the pressure of fluid in a pipeline. The device comprises an annular housing that is axially insertable in the pipeline between two ends thereof. The annular housing has a central opening through which fluid in the pipeline flows. The central opening defines an inner diameter of the annular housing. Secured to the annular housing around the central opening thereof is a flexible sleeve member. An annular fluid chamber is positioned around and in communication with the outer surface of the sleeve member. A sensing fluid cavity extends radially from the annular fluid chamber toward the outer periphery of the annular housing. The annular fluid chamber and the sensing fluid cavity is filled with a sensing fluid. An elastomeric member seals the top end of the sensing fluid cavity. A pressure gauge assembly is releasably secured around the upper end of the sensing fluid cavity. The pressure gauge assembly includes a hollow needle extending downwardly therefrom and a pressure gauge. The needle extends into the sensing fluid cavity through the elastomeric member.

## Claims

### Claim 1

A pressure monitoring isolating device for monitoring the pressure of fluid in a pipeline comprising:
an annular housing having an outer periphery and being axially insertable in said pipeline, ,said annular housing having a central opening through which said fluid in said pipeline flows, said central opening defining an inner diameter of said annular housing;
a flexible sleeve member secured to said annular housing around said central opening thereof, said sleeve member having inner and outer surfaces;
an annular fluid chamber positioned around and in communication with said outer surface of said sleeve member;
a sensing fluid cavity extending radially from said annular fluid chamber toward said outer periphery of said annular housing, said cavity having a free end;
a sensing fluid filling said annular fluid chamber and said sensing fluid cavity;
means for sealing said free end of said sensing fluid cavity, said sealing means including an elastomeric member located adjacent said free end of said sensing fluid cavity and having a bore passing substantially entirely therethrough, and
a pressure gauge assembly and means for releasably securing said pressure gauge assembly to said sensing fluid cavity, said pressure gauge assembly including a hollow needle extending therefrom and a pressure gauge for monitoring the pressure of said fluid, said needle extending into said sensing fluid cavity through said bore in said elastomeric member,
said bore in said elastomeric member having a diameter smaller than the diameter of said needle, said elastomeric member having restoring forces which cause said bore to seal when said needle of said pressure gauge assembly is removed therefrom.

### Claim 2 (depends on 1)

The isolating device of claim 1 wherein said annular housing has an end plate secured to each side thereof for facilitating the securement of said device between two ends of said pipeline.

### Claim 3 (depends on 1)

The isolating device of claim 1 further including a vertical channel member projecting outwardly from said annular housing, said free end of said sensing fluid cavity extending into said vertical channel member.

### Claim 4 (depends on 3)

The isolating device of claim 3 further including means for threadably securing said pressure gauge assembly to said vertical channel member.

### Claim 5 (depends on 4)

The isolating device of claim 4 wherein said securing means includes an internally threaded nut positioned around said vertical channel member and extending upwardly therefrom, and a coupling segment secured to said pressure gauge assembly, said coupling segment having external threads formed around the periphery thereof for threadably securing said pressure gauge assembly to said nut.