Patent US2993602A successfully refreshed from Google Patents.
Patent US3933172A successfully refreshed from Google Patents.
US3933172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipeline surge reliever with sanitary barrier
Assignee: Grove Valve and Regulator Co
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Filing: 1975-02-24
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Granted: 1976-01-20
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Expires: 1995-02-24
Abstract
Abstract In a pressure surge relief system wherein a valve opens to relieve the pipeline when line pressure overcomes a pilot chamber gas pressure and including an accumulator which transfers the pressure of the pipeline liquid to the gas in the pilot chamber, the improvement comprising a column of relatively inert fluid which isolates the elastomer components of the accumulator from the possibly corrosive pipeline fluid.
Inventors
- 👤 Donald M. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:22
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/055; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/07; F16L55/05; F16L55/052; F16L55/053; F17; F17D; F17D1/00; F17D1/20; Y; Y10; Y10S; Y10S137/00; Y10S137/906; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/7781
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
In a pressure surge relief system for a liquidtransporting pipeline including: an accumulator for transferring the pressure of the liquid in a pipeline to a gas; and a pilot load duct connected between said pipeline and said accumulator; means for isolating the interior of said accumulator from the liquid in the pipeline comprising: a barrier fluid vessel connected into said pilot load duct; a first connection of the pilot load duct opening from a first portion of said fluid vessel to said accumulator; and a second connection opening from another portion of said fluid vessel to said pipeline; a relatively inert liquid occupying said accumulator, said first connection and said first portion of said vessel; the pipeline liquid occupying said second connection and said another portion of said vessel; and means separating said pipeline liquid and said inert liquid while equalizing pressures thereof.
Claim 2
Dependent Claim
143 words
In a pressure surge relief system for a liquidtransporting pipeline including: an accumulator for transferring the pressure of the liquid in a pipeline to a gas; and a pilot load duct connected between said pipeline and said accumulator; means for isolating the interior of said accumulator from the liquid in the pipeline comprising: a barrier fluid vessel connected into said pilot load duct; a first connection of the pilot load duct opening from a first portion of said fluid vessel to said accumulator; and a second connection opening from another portion of said fluid vessel to said pipeline; a relatively inert liquid occupying said accumulator, said first connection and said first portion of said vessel; the pipeline liquid occupying said second connection and said another portion of said vessel; and means separating said pipeline liquid and said inert liquid while equalizing pressures thereof.
Claim 3
Dependent Claim
40 words
The improvement defined by claim 1 wherein said lastnamed means comprises: an elastomeric membrane dividing said fluid vessel into first and second compartments; said first connection opening from said first compartment; and said second connection opening from said second compartment.
Claim 4
Dependent Claim
18 words
The improvement defined by claim 2 wherein: said elastomeric membrane comprises a bladder sealed around said first connection.
Claim 5
Dependent Claim
27 words
The improvement defined by claim 1 wherein: said inert liquid and said pipeline liquid are of different specific gravities and said last-named means is an interface therebetween.
Claim 6
Dependent Claim
20 words
The improvement defined by claim 4 wherein: said first and second connections are at different elevations on said fluid vessel.
Claim 7
Dependent Claim
12 words
The improvement defined by claim 4 wherein: said liquids are relatively immiscible.
Claim 8
Dependent Claim
44 words
The improvement defined by claim 5 including: a checking tap opening from said fluid vessel at a test level intermediate said first and second connections to insure the presence of said inert liquid at said test level at a predetermined condition of said accumulator.
Claim 9
Dependent Claim
27 words
The improvement defined by claim 7 including: an inert liquid charging port opening into said vessel at a level intermediate said first connection and said test level.
Claim 10
Dependent Claim
32 words
The improvement defined by claim 5 wherein: said inert fluid is of a heavier specific gravity than said pipeline liquid; and said first connection is situated near the bottom of said vessel.
Claim 11
Dependent Claim
116 words
The pressure surge relief system defined by claim 1 including: a surge relief line adapted for connection from a pipeline to a low pressure zone; a surge reliever valve in said surge relief line; a pressure-responsive member operating said surge reliever valve; a gas chamber in said surge reliever valve disposed so that the pressure of gas therein urges said pressure-responsive member in one direction to close said surge reliever valve; means exposing said pressure-responsive member to fluid in said surge relief line to bias it in the opposite direction; said accumulator maintaining the pressure in said gas chamber at the pressure in said pilot load duct; and flow restricting means in said pilot load duct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |