US3815628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief system
Assignee: Dresser Industries Inc
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Filing: 1973-08-15
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Granted: 1974-06-11
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Expires: 1993-08-15
Abstract
Abstract A pilot operator for controlling main valve operation to relieve overpressure from a system to which the main valve is connected. A spring biased pilot disc normally maintains the operator closed in opposition to system pressures below set pressure. On an overpressure being encountered, the disc lifts from its seat to effect main valve operation. A variably presettable adjustment in the path of disc movement regulates lift distance for effecting desired blowdown operation of the main valve.
Inventors
- 👤 H Ferrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:58
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7738; Y10T137/7744; Y10T137/7745; Y10T137/7747; Y10T137/7781
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
373 words
A pressure relief system for high pressure steam service comprising in combination: a. a main valve including: 1. body means defining a main valve passage having an inlet adapted to be connected with a source of steam service from which relief is to be effected and an outlet for discharging overpressure from said source; 2. a moveable closure disc positioned intermediate the inlet and outlet of said main valve passage for opening and closing said passage to fluid flow from said source; 3. spring means biasing said closure disc toward closed position in opposition to source pressure at the inlet of said main valve passage; and 4. means defining a back pressure chamber In constant communication with source pressure at said inlet for pressure therein to aid said spring means in biasing said closure disc toward said closed position; b. an actuator valve operably connected to said main valve and including: 1. body means defining an actuator passage having an inlet in communication with the back pressure chamber of said main valve and an outlet in communication with the outlet of said main valve passage; and 2. piston means in said actuator passage operably moveable between positions to open and close said passage to fluid flow; and c. a pilot operator including: 1. body means defining a pilot passage having an inlet adapted to be connected with the same source of steam service to which the main valve passage is connected and an outlet for discharging overpressure from said source; 2. disc means in said pilot passage operably moveable between positions to open and close said passage to fluid flow; 3. spring means biasing said disc means toward closed position in opposition to source pressure at the inlet of said pilot passage; 4. said pilot passage outlet being in communication with the piston means of said actuator valve for enabling fluid pressure when present in said outlet to operate said actuator piston means to the open position of said actuator passage whereby to effect concomitant movement of said main valve closure disc to the open position of said main valve passage; and 5. adjustment means effective to variably preset main valve blowdown in response to relief operation of fluid pressure from said source.
Claim 2
Dependent Claim
373 words
A pressure relief system for high pressure steam service comprising in combination: a. a main valve including: 1. body means defining a main valve passage having an inlet adapted to be connected with a source of steam service from which relief is to be effected and an outlet for discharging overpressure from said source; 2. a moveable closure disc positioned intermediate the inlet and outlet of said main valve passage for opening and closing said passage to fluid flow from said source; 3. spring means biasing said closure disc toward closed position in opposition to source pressure at the inlet of said main valve passage; and 4. means defining a back pressure chamber In constant communication with source pressure at said inlet for pressure therein to aid said spring means in biasing said closure disc toward said closed position; b. an actuator valve operably connected to said main valve and including: 1. body means defining an actuator passage having an inlet in communication with the back pressure chamber of said main valve and an outlet in communication with the outlet of said main valve passage; and 2. piston means in said actuator passage operably moveable between positions to open and close said passage to fluid flow; and c. a pilot operator including: 1. body means defining a pilot passage having an inlet adapted to be connected with the same source of steam service to which the main valve passage is connected and an outlet for discharging overpressure from said source; 2. disc means in said pilot passage operably moveable between positions to open and close said passage to fluid flow; 3. spring means biasing said disc means toward closed position in opposition to source pressure at the inlet of said pilot passage; 4. said pilot passage outlet being in communication with the piston means of said actuator valve for enabling fluid pressure when present in said outlet to operate said actuator piston means to the open position of said actuator passage whereby to effect concomitant movement of said main valve closure disc to the open position of said main valve passage; and 5. adjustment means effective to variably preset main valve blowdown in response to relief operation of fluid pressure from said source.
Claim 3
Dependent Claim
27 words
a moveable closure disc positioned intermediate the inlet and outlet of said main valve passage for opening and closing said passage to fluid flow from said source;
Claim 4
Dependent Claim
27 words
a moveable closure disc positioned intermediate the inlet and outlet of said main valve passage for opening and closing said passage to fluid flow from said source;
Claim 5
Dependent Claim
19 words
disc means in said pilot passage operably moveable between positions to open and close said passage to fluid flow;
Claim 6
Dependent Claim
19 words
disc means in said pilot passage operably moveable between positions to open and close said passage to fluid flow;
Claim 7
Dependent Claim
25 words
piston means in said actuator passage operably moveable between positions to open and close said passage to fluid flow; and c. a pilot operator including:
Claim 8
Dependent Claim
25 words
piston means in said actuator passage operably moveable between positions to open and close said passage to fluid flow; and c. a pilot operator including:
Claim 9
Dependent Claim
42 words
A pressure relief system according to claim 1 in which said pilot operator adjustment means comprises means to presettably regulate the distance limits of said pilot operator disc means in moving between its said closed and full open positions in said passage.
Claim 10
Dependent Claim
30 words
A pressure relief system according to claim 2 in which said pilot operator adjustment means settings of said distance limits are inversely related to the effected main valve blowdown operation.
Claim 11
Dependent Claim
21 words
spring means biasing said disc means toward closed position in opposition to source pressure at the inlet of said pilot passage;
Claim 12
Dependent Claim
21 words
spring means biasing said disc means toward closed position in opposition to source pressure at the inlet of said pilot passage;
Claim 13
Dependent Claim
23 words
spring means biasing said closure disc toward closed position in opposition to source pressure at the inlet of said main valve passage; and
Claim 14
Dependent Claim
23 words
spring means biasing said closure disc toward closed position in opposition to source pressure at the inlet of said main valve passage; and
Claim 15
Dependent Claim
59 words
said pilot passage outlet being in communication with the piston means of said actuator valve for enabling fluid pressure when present in said outlet to operate said actuator piston means to the open position of said actuator passage whereby to effect concomitant movement of said main valve closure disc to the open position of said main valve passage; and
Claim 16
Dependent Claim
59 words
said pilot passage outlet being in communication with the piston means of said actuator valve for enabling fluid pressure when present in said outlet to operate said actuator piston means to the open position of said actuator passage whereby to effect concomitant movement of said main valve closure disc to the open position of said main valve passage; and
Claim 17
Dependent Claim
44 words
means defining a back pressure chamber In constant communication with source pressure at said inlet for pressure therein to aid said spring means in biasing said closure disc toward said closed position; b. an actuator valve operably connected to said main valve and including:
Claim 18
Dependent Claim
44 words
means defining a back pressure chamber In constant communication with source pressure at said inlet for pressure therein to aid said spring means in biasing said closure disc toward said closed position; b. an actuator valve operably connected to said main valve and including:
Claim 19
Dependent Claim
43 words
A pressure relief system according to claim 3 in which said pilot operator adjustment means comprises means to presettably vary the total lift distance of said pilot operator disc means in moving to said open position against the force of said spring means.
Claim 20
Dependent Claim
20 words
adjustment means effective to variably preset main valve blowdown in response to relief operation of fluid pressure from said source.
Claim 21
Dependent Claim
20 words
adjustment means effective to variably preset main valve blowdown in response to relief operation of fluid pressure from said source.
Claim 22
Dependent Claim
52 words
A pressure relief system according to claim 4 in which said pilot operator adjustment means comprises an axially moveable plug coaxially aligned with said pilot operator disc means and supported in interfering relation in the path of disc means movement for defining the disc means lift limit in its full open position.
Claim 23
Dependent Claim
26 words
A pressure relief system according to claim 5 in which said plug is threadedly supported and includes external indicia referencing the threaded lift distance setting thereof.
Claim 24
Dependent Claim
45 words
A pressure relief system according to claim 6 in which said pilot operator disc means includes a protuberance axially extending toward the proximate surface of said plug for engagement therewith at said full open position to define the open limit of said disc means lift.
Claim 25
Dependent Claim
28 words
A pressure relief system according to claim 7 in which said protuberance comprises an annular bevel having an apex adapted to engage the proximate surface of said plug.
References Cited (Backward Citations)
US3456674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |