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WO2000065321A1 - Jauge de pression - Google Patents

Jauge de pression Download PDF

Info

Publication number
WO2000065321A1
WO2000065321A1 PCT/US2000/010296 US0010296W WO0065321A1 WO 2000065321 A1 WO2000065321 A1 WO 2000065321A1 US 0010296 W US0010296 W US 0010296W WO 0065321 A1 WO0065321 A1 WO 0065321A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
valve
cylinder
disposed
pressure gauge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/010296
Other languages
English (en)
Inventor
Howard M. Gammon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gammon Technical Products Inc
Original Assignee
Gammon Technical Products Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gammon Technical Products Inc filed Critical Gammon Technical Products Inc
Publication of WO2000065321A1 publication Critical patent/WO2000065321A1/fr
Priority to US10/402,236 priority Critical patent/US6694819B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0618—Overload protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0026—Transmitting or indicating the displacement of flexible, deformable tubes by electric, electromechanical, magnetic or electromagnetic means
    • G01L9/0027—Transmitting or indicating the displacement of flexible, deformable tubes by electric, electromechanical, magnetic or electromagnetic means using variations in ohmic resistance

Definitions

  • the present invention relates to a pressure gauge and more particularly to a gauge for measuring the difference in pressure between two pressure signals and an associated pressure relieving feature.
  • Differential pressure can be determined in many ways.
  • One of the simplest methods of determining differential pressure is to measure or observe the motion of a close fitting piston balanced by a spring in a cylinder. A higher pressure is applied to the end of the cylinder not in communication with the spring and a lower pressure is applied to the end of the cylinder in communication with the spring. Accordingly, the higher pressure will cause the piston to move.
  • the spring will be caused to compress until the force required to compress the spring added to the force caused by the lower pressure equals the force caused by the higher pressure.
  • the distance that the piston travels can be measured and when carefully calibrated in terms of pressure differential will provide a reading of the difference between the high and low pressures.
  • Differential pressure gauges of the spring-balanced piston type are subject to erratic operation due to the disposition and collection of contamination in the clearance space between the piston and the associated cylinder.
  • the clearance of the piston and the cylinder is very small (approximately 0.0003 inches) so that there is very little fluid flow possible. No seal is used because it would create friction thereby decreasing the accuracy of the gauge.
  • a test for possible contamination in a gauge that has a cylinder made of glass is commonly performed.
  • the test is typically achieved by closing the low pressure connection and then venting the cavity beneath the piston so that the high pressure on top of the piston will drive the piston over its full length of travel.
  • the operator observes the piston motion to detect erratic movement which would be indicative of binding caused by contaminating deposits.
  • a 3 -way selector valve located at the port where the low pressure connection is made.
  • Another issue which must be considered in the operation of equipment that is subject to pressure is to provide for protection against excessive pressure by utilizing a pressure relief valve.
  • a common application for a pressure relief valve is on a filter vessel in a pipeline system.
  • a differential pressure gauge If a differential pressure gauge is installed on the vessel, it is protected from excessive pressure by the pressure relief valve on the vessel. However, if isolation valves are closed which are installed in the tubing connecting the differential pressure gauge to the vessel, the excessive pressure in the gauge cannot be relieved. The gauge will break if the pressure exceeds the design pressure parameters of the gauge. To avoid this problem, a separate pressure relief valve can be installed on the gauge at considerable cost.
  • a differential pressure gauge having an automatically operative pressure relief valve and a manually operable three-way valve to provide a venting function useful for inspecting the operation of the pressure operated piston of the pressure gauge.
  • Fig. 1 is an elevational view partially in section showing a differential pressure gauge including a pressure relieving valve incorporating the features of the invention
  • Fig. 2 is an enlarged sectional view of the pressure relief valve illustrated in Fig. 1;
  • Fig. 3 is a fragmentary sectional view of the pressure relief valve illustrated in Fig. 2 taken along line 3-3 thereof showing the manually operable three-way valve in the depressed position.
  • the pressure gauge 10 includes a main housing or cage 12.
  • a translucent glass cylinder 14 is disposed within the cage 12.
  • the ends of the glass cylinder 14 are sealed to an upper flange 16 and a lower flange 18 with O-rings 20, 22, respectively.
  • the upper flange 16 and the lower flange 18 are removably mounted to the cage 12.
  • a piston 24 is slidably operable within the glass cylinder 14.
  • the piston 24 strictly conforms to the shape of the glass cylinder 14 to maintain a close tolerance. Typically, the clearance between the outer wall of the piston 24 and the inner wall of the cylinder 14 is approximately 0.0003 inches or less.
  • the piston 24 is urged by and supported within the glass cylinder 14 by a helical spring 26. One end of the spring 26 abuts a lip 27 on the flange 18. The opposite end of the spring 26 abuts an inner surface of the piston 24.
  • a nameplate 28 is disposed on the cage 12. A window 30 formed in the nameplate 28 facilitates viewing of the position of the piston 24 within the glass cylinder 14.
  • a high-pressure inlet 32 is in fluid communication with the end of the glass cylinder 14 towards which the piston 24 is being urged by the spring 26.
  • the high- pressure inlet 32 is adapted to be placed in fluid communication with a high-pressure source (not shown) .
  • a low-pressure inlet 34 is in fluid communication with the opposite end of the glass cylinder 14 as the high-pressure inlet 32.
  • the low-pressure inlet 34 is adapted to be placed in fluid communication with a low- pressure source (not shown) .
  • Fig. 2 there is shown an automatically operating pressure relief valve.
  • the pressure relief valve is disposed in the pressure gauge 10 adjacent the low pressure inlet 34, as illustrated in Fig. 1.
  • the pressure relief valve includes an inlet port 36.
  • the inlet port 36 is in fluid communication with the low-pressure inlet 34.
  • a hollow fitting 38 is disposed in the flange 18.
  • An O-ring 39 seals the outer surface of the hollow fitting 38 with the flange 18.
  • a valve member 40 is slidably disposed within the interior portion of the hollow fitting 38.
  • a hole 41 is formed to extend transversely through the valve 40.
  • One end of a helical spring 42 abuts the valve 40.
  • the other end of the spring 42 abuts an adjusting screw 44.
  • the spring 42 urges the valve 40 to seat against an 0-ring 46 thereby sealing the valve 40 with the hollow fitting 38.
  • a clearance or chamber 48 surrounds a portion of the outer wall of the hollow fitting 38 and is in fluid communication with the inlet port 36.
  • a lateral passageway 50 leads from the chamber 48 to a main passageway 52.
  • the lateral passageway 50 and the main passageway 52 permit fluid communication between the chamber 48 and the glass cylinder 14.
  • a strainer 54 is disposed in an enlarged portion of the main passageway 52 adjacent the glass cylinder 14.
  • a vent port 56 is disposed in the end of the hollow fitting 38 to provide fluid communication between the hollow portion of the hollow fitting 38 and a reservoir (not shown) or the atmosphere surrounding the pressure gauge, as desired.
  • the pressure relief valve structure is combined with additional structure to form a manually operable three-way valve to provide a venting function.
  • a hollow insert 58 is disposed in the flange 18 opposite the hollow fitting 38. Spaced apart O-rings 60, 62 seal the hollow insert 58 with the flange 18.
  • a shaft 64 is slidably disposed in the hollow portion of the hollow insert 58.
  • An O-ring 66 seals the shaft 64 with the hollow insert 58.
  • a channel 68 is disposed in one end of the shaft 64.
  • a push button 70 is disposed on the shaft 64 at the opposite end thereof from the channel 68. The push button 70 is insertable into an enlarged portion of the hollow insert 58 and extractable therefrom.
  • a depressible normally outwardly urged protuberance 72 is disposed in and extends from the push button 70.
  • the lower pressure fluid reaches the cylinder cavity under the piston from low- pressure inlet 34 and passes through the inlet port 36 into the chamber 48.
  • the fluid then enters the lateral passageway 50 and the main passageway 52 before passing through the strainer 54.
  • the push button 70 When the push button 70 is pushed inwardly, it is caused to be urged against the end of the valve 40 which, in turn, is restrained by the spring 42, as illustrated in Fig. 3.
  • the adjusting screw 44 can be moved inwardly or outwardly to create the desired restraining force.
  • the unseating of valve 40 allows the fluid that is under the piston to be forced through the main passageway 52 and the lateral passageway 50 and into the chamber 48.
  • the fluid can then flow through the hole 41 in the valve 40 and pass out of the gauge assembly through the vent port 56.
  • the fluid is either discharged through the vent port 56 to the atmosphere or piped away to a reservoir.
  • flow of low- pressure fluid from the low-pressure inlet 34 can then refill the cavity under the piston.
  • the valve 40 performs two functions. First, the valve operates as an automatic pressure relief valve. Second, the valve operates as a manual 3- way valve that can be activated to perform the venting function that is used to inspect the operation of the piston. Therefore, a benefit of the invention is the replacement of a 3 -way selector valve with a 3 -way valve that consists of a spring return push button that performs the same function which also functions as a pressure relief valve.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Measuring Fluid Pressure (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne une jauge de pression possédant un piston (24) commandé par la pression, servant à mesurer la différence de pression entre deux signaux de pression, ainsi qu'une soupape de sûreté opérationnelle.
PCT/US2000/010296 1999-04-23 2000-04-17 Jauge de pression Ceased WO2000065321A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/402,236 US6694819B1 (en) 1999-04-23 2000-11-13 Pressure gauge with automatically operated pressure relief valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13089599P 1999-04-23 1999-04-23
US60/130,895 1999-04-23

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/402,236 Continuation US6292725B1 (en) 1997-04-04 1998-03-04 Interference preventing device for vehicle

Publications (1)

Publication Number Publication Date
WO2000065321A1 true WO2000065321A1 (fr) 2000-11-02

Family

ID=22446863

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/010296 Ceased WO2000065321A1 (fr) 1999-04-23 2000-04-17 Jauge de pression

Country Status (2)

Country Link
CN (1) CN1157597C (fr)
WO (1) WO2000065321A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2720022B1 (fr) 2012-10-12 2018-03-07 Magna Steyr Fahrzeugtechnik AG & Co KG Indicateur de pression pour installations d'accumulation haute pression

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392632A (en) * 1981-10-14 1995-02-28 Oval Engineering Co.,Ltd. Small volume prover

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392632A (en) * 1981-10-14 1995-02-28 Oval Engineering Co.,Ltd. Small volume prover

Also Published As

Publication number Publication date
CN1157597C (zh) 2004-07-14
CN1310796A (zh) 2001-08-29

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