US1056562A - Safety-valve. - Google Patents

Safety-valve. Download PDF

Info

Publication number
US1056562A
US1056562A US1911642912A US1056562A US 1056562 A US1056562 A US 1056562A US 1911642912 A US1911642912 A US 1911642912A US 1056562 A US1056562 A US 1056562A
Authority
US
United States
Prior art keywords
valve
chamber
steam
pilot valve
pipe
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.)
Expired - Lifetime
Application number
Inventor
Joanny Lombard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US1911642912 priority Critical patent/US1056562A/en
Application granted granted Critical
Publication of US1056562A publication Critical patent/US1056562A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0433—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with vibration preventing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7738—Pop valves
    • Y10T137/774—Pop pressure reactor in inflow to valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type
    • Y10T137/7764—Choked or throttled pressure type
    • Y10T137/7766—Choked passage through main valve head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7784—Responsive to change in rate of fluid flow

Definitions

  • the present invention relates to a safety valve for steam generators and other applications, of the typein which a main shut od valve inthe blow oif pipe is combined with a pilot valve the lifting of which determines the actuation of the said main valve.
  • a main shut od valve inthe blow oif pipe is combined with a pilot valve the lifting of which determines the actuation of the said main valve.
  • the lifting of the pilot valve when the steam attains an excessive pressure shuts off communication between the upper face of the main valve and the stealn pressure, and simultaneously places the said upper face in communication with the atmosphere.
  • the main valve then lifts suddenly owing to the pressure of the steam on an annular facing on the bottom of the valve which gives rise to a sudden pressure drop in the steam pressure pipe and subsequent lowering of the pilot valve. This results in continual alternating hammering or knocking of the pilot and main valves.
  • the present invention has for object to prevent this knocking or hammering which retards the blow off of the steam at excessive pressure, and this object is accomplished by providing at one end of the pilot valve stem a suitable head, formed as adisk or piston, and conducting against one face of the head live steam which passes through a restricted conduit, one end of which is pref-P erably flared and opens into the steam admission passage, and the other end of which opens into one end of the chamber wherein the head on the pilot valve works.
  • the face of the head opposite that which receives the live steam is adapted to be placed in communication with the atmosphere by means of an exhaust port as soon as the main.
  • Figure 1 is a sectional elevation of an Ordinar safety valve of the type referred to, and Figs. 2, 3 and 4, similar views of three examples of the improved safety valve according to this invention.
  • FIG. 1 of the accompanying drawings shows a combined valve of the usual type.
  • a balanced pilot valve consisting in a cylinder b on a. portion of which are formed flats b.
  • a pipe c communicates with the atmosphere and is provided with a seating el for the mai valve e which is normally acted upon by the steam on the annular part el of its lower surface and on the whole of its upper surface owing to the passage of the fluid between the flats of the pilot valve and the walls of its pipe.
  • the passage arrangementfor the steam act-- ing on the pilot valve is realized bymeans of a conduit with a iiared end ⁇ f leading into the pipe a, the other end of the conduit leading into a chamber g in which works ahead or piston b2 formed on the lower end of the pilot valve.
  • the main valve e works in a chamber m of which the upper part is in communication through a port n with the external wall of the part of the pilot valve rod immediately below the seat-ing 123.
  • the surface of the rod is formed with reduced portions such as a series of flats or iiutings o o2 o3 04 of decreasing length, which are successively uncovered when the pilot valve rises.
  • the chamber g is in communication at its upper part through a duct p with a chamber surrounding the lower end of the main valve, and above the seating cl of this latter.
  • the arrangement works as follows: The live steam coming from the generator on reaching the flared end fis swept into the conduit, and when its'pressure is suiicient, raises the piston b2 of the balanced pilot valve. As soonl as the utings 0 o2 o8 o4 are uncovered above the seating b com- ⁇ valve lifts. The lifting of the main valve however, cannot produce in the pipe a a pressure reduction capable of causing knocking of the pilot valve, since the steam 1n this pipe always first encounters the iiaredl end of the conduit f. When the main valve e is raised from its seat, the passage p.
  • This valve serves yto place the chamber g in eommunlcation with the atmosphere, through the exhaust port, and hence the lifting of the valve e causes a corresponding pressure reduction in the upper part of the chamber g, above thepiston b2 of the pilot valve, and tends to increase the lift of this latter.
  • a progressive lifting of the main valve is moreover assured in the following manner: This valve is hollow,
  • the piston b2 instead of fitting steam tight with the walls of the chamber g, consists of a disk having a suitable amount of play between its periphery andthe internal wall of the chamber, the structure -beingl such that a limited amount of clearance -is also provided between Athe stem of the pilot valve and that part vof the valve casing wherein it slides.
  • the duct. p connecting the upper part of the chamber g, and the partwith reducedI diameter of the main valve, may then be omitted.
  • a safety valve a main valve with its seating in the blow off pipe, a pilot valve having a head at one end of its Stem the lifting of which pilot valve determines the actuation of the main valve, a chamber in which said. head works, a conduit having one end flared and projecting into the admission pipe while the other end opens into the chamber below the head, and means for maintaining the pressure in the chamber above the head the same as that above the main valve seating.
  • a safety valve embodying therein a valve casing having a uid admission port, anexhaust port and a port leading to atmosphere, a pilot valve having a head against which fluid iiowing into said admission port is adapted to impinge, a main valve normally seated over said exhaust port, means adapted, upon actuation of said pilot valve, to place the main valve in communication with atmosphere through said port leading to atmosphere, and means leading from said main valve to said pilot valve whereby one face of the head carried by said pilot valve is placed in communication with the exhaust port when said main valve is placed in communication with atmosphere.
  • a safety valve In a safety valve, a hollow main valve with its seating in the blow olf pipe, a chamber in which the main valve slides steam tight, narrow passages in the walls of the main valve connecting the space above its seating with the inside of. the said valve, a tapering hole in the top wall of the hollow main valve, a fixed tapering rod passing loosely through the said hole, a pilot valve, a series of progressively lengthenin utings on the pilot valve rod immediately elow the communication between these flutings an the top of the main valve, a chamber 1n which works a head on the end of the pilot valve rod, and a passage having one end flared and projecting into the admission pipe while the plther end opens into the chamber below the 4.
  • a safety valve In a safety valve, a hollow main valve with its seating in the blow of pipe, a chamber in which the main valve slides steam tight, narrow passages in the walls of the main valve connecting the space above its seating with the inside of the said valve, a tapering hole in the top wall of the hollow main valve, a Xed tapering rod passing loosely through the said hole, a pilot valve, a series of 'progressively lengthening flutings on the pilot rod immediately below thev valve seat, a passage providing communication between these utings andthe top of the main valve, a chamber in which Works a head on the pilot valve rod, a conduit having one end flared and projecting into the admission pipe while the other end 10 opens into the chamber below thehead, and

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Lift Valve (AREA)

Description

d if
W f y W gz y v n/ `Patented Mar.18,.19`13.
n s'nsnTs-snnm 1.
J; LQMBARD,
WM l
Patented'l-ar. 18, 1913.
2 SHEETS-SHEET 2.
JOANN'Y LOMBARD, 0F LILLE, FRANCE.
SAFETY-VALVE.
Specification of Letters Patent.
Patented Mar. 18, 1913.
Application led August 8, 1%??11. Serial No. 642,912.
To all fwkom it may concern:
Be it known that I, JOAXXY LOMBARD, citizen of the Republic of France. residing at 3Q Rue de Valenciennes, Lille, Nord, France, have invented new and useful Improvements in Safety-Valves, of which the following isa specification.
The present invention relates to a safety valve for steam generators and other applications, of the typein which a main shut od valve inthe blow oif pipe is combined with a pilot valve the lifting of which determines the actuation of the said main valve. In valves of this type the lifting of the pilot valve when the steam attains an excessive pressure, shuts off communication between the upper face of the main valve and the stealn pressure, and simultaneously places the said upper face in communication with the atmosphere. The main valve then lifts suddenly owing to the pressure of the steam on an annular facing on the bottom of the valve which gives rise to a sudden pressure drop in the steam pressure pipe and subsequent lowering of the pilot valve. This results in continual alternating hammering or knocking of the pilot and main valves.
The present invention has for object to prevent this knocking or hammering which retards the blow off of the steam at excessive pressure, and this object is accomplished by providing at one end of the pilot valve stem a suitable head, formed as adisk or piston, and conducting against one face of the head live steam which passes through a restricted conduit, one end of which is pref-P erably flared and opens into the steam admission passage, and the other end of which opens into one end of the chamber wherein the head on the pilot valve works. The face of the head opposite that which receives the live steam is adapted to be placed in communication with the atmosphere by means of an exhaust port as soon as the main. valve lifts from its seat, the result being that there is' a reduction of pressure on o e side of the head thus enabling the live steam to easily raise the pilot valve and maintain it in elevated position. The steam passing through this restricted conduit always arrives at the pilot valve with some speed and any pressure drop below the pilot is rendered impossible.
Further novel features` will' be subsequently described and pointed out inthe claims. i
' In the accompanying drawings: Figure 1 is a sectional elevation of an Ordinar safety valve of the type referred to, and Figs. 2, 3 and 4, similar views of three examples of the improved safety valve according to this invention.
Fig. 1 of the accompanying drawings shows a combined valve of the usual type.
In a pipe a'tted on the upper part of thechamber df tlie steam generator 1s arranged a balanced pilot valve consisting in a cylinder b on a. portion of which are formed flats b. A pipe c communicates with the atmosphere and is provided with a seating el for the mai valve e which is normally acted upon by the steam on the annular part el of its lower surface and on the whole of its upper surface owing to the passage of the fluid between the flats of the pilot valve and the walls of its pipe.
In Figs. 2, 3 and 4, a denotes as in Fig. l,
the inlet pipe for thesteam coming from the steam chamber of thegenerator, c the blow oipipe in communication with the atmosphere; b the pilot valve and e the main valve for which a seating is fbrmed at d in the pipe c. In the examples of Figs. 2 and 3, the passage arrangementfor the steam act-- ing on the pilot valve is realized bymeans of a conduit with a iiared end `f leading into the pipe a, the other end of the conduit leading into a chamber g in which works ahead or piston b2 formed on the lower end of the pilot valve. The main valve e works in a chamber m of which the upper part is in communication through a port n with the external wall of the part of the pilot valve rod immediately below the seat-ing 123. The surface of the rod is formed with reduced portions such as a series of flats or iiutings o o2 o3 04 of decreasing length, which are successively uncovered when the pilot valve rises. The chamber g is in communication at its upper part through a duct p with a chamber surrounding the lower end of the main valve, and above the seating cl of this latter.
The arrangement works as follows: The live steam coming from the generator on reaching the flared end fis swept into the conduit, and when its'pressure is suiicient, raises the piston b2 of the balanced pilot valve. As soonl as the utings 0 o2 o8 o4 are uncovered above the seating b com- `valve lifts. The lifting of the main valve however, cannot produce in the pipe a a pressure reduction capable of causing knocking of the pilot valve, since the steam 1n this pipe always first encounters the iiaredl end of the conduit f. When the main valve e is raised from its seat, the passage p. serves yto place the chamber g in eommunlcation with the atmosphere, through the exhaust port, and hence the lifting of the valve e causes a corresponding pressure reduction in the upper part of the chamber g, above thepiston b2 of the pilot valve, and tends to increase the lift of this latter. In the example illustrated a progressive lifting of the main valve is moreover assured in the following manner: This valve is hollow,
and its upper wall contains a central taper,-H
ing hole e2 in which fits a rod of similar form g attached to the upper wall of the chamber m. The steam reaches the interior of the hollow valve through narrow passages e e3 and escapes toward the upper part of the chamber m with greater facility as the lift of the valve is greater, so that the back pressure of this shunt flow of steam increases in proportion as the main valve rises, and finally limits this lifting.
In the modification of Fig. 3 the piston b2 instead of fitting steam tight with the walls of the chamber g, consists of a disk having a suitable amount of play between its periphery andthe internal wall of the chamber, the structure -beingl such that a limited amount of clearance -is also provided between Athe stem of the pilot valve and that part vof the valve casing wherein it slides. The duct. p connecting the upper part of the chamber g, and the partwith reducedI diameter of the main valve, may then be omitted. The operation of the arrangement is exactly the same as in the foregoing eX- ample, in that the reduction in pressure produced when the main valve lifts is transmitted to the upper face of the head b2 through the space between the stem of the pilot valve and the casing, whereby the live steam acting against the valve head is enabled to easily raise the pilot valve and hold it in elevated position.
' In the example of Fig. 4, the by-passing of ythe live steam in the pipe awhich leads to the steam chamber of the generator, is obtained by a different method. The rod of the pilot valve I), guided by a sleeve r projecting into the interior of the pipe a is provided at its lower end with a disks of which the edges are preferably curved downward, there being left between the .periphery of the disk and theA walls of the pipe a only a suitably valve seat, a passage providin encounters on its path the disk s and is forced to fiow between it and the wall of the pipe a.
Havingnow described my invention what I claim as new and desire to secure by Letters Patent is 1. In a safety valve, a main valve with its seating in the blow off pipe, a pilot valve having a head at one end of its Stem the lifting of which pilot valve determines the actuation of the main valve, a chamber in which said. head works, a conduit having one end flared and projecting into the admission pipe while the other end opens into the chamber below the head, and means for maintaining the pressure in the chamber above the head the same as that above the main valve seating.
2. A safety valve embodying therein a valve casing having a uid admission port, anexhaust port and a port leading to atmosphere, a pilot valve having a head against which fluid iiowing into said admission port is adapted to impinge, a main valve normally seated over said exhaust port, means adapted, upon actuation of said pilot valve, to place the main valve in communication with atmosphere through said port leading to atmosphere, and means leading from said main valve to said pilot valve whereby one face of the head carried by said pilot valve is placed in communication with the exhaust port when said main valve is placed in communication with atmosphere.
3. In a safety valve, a hollow main valve with its seating in the blow olf pipe, a chamber in which the main valve slides steam tight, narrow passages in the walls of the main valve connecting the space above its seating with the inside of. the said valve, a tapering hole in the top wall of the hollow main valve, a fixed tapering rod passing loosely through the said hole, a pilot valve, a series of progressively lengthenin utings on the pilot valve rod immediately elow the communication between these flutings an the top of the main valve, a chamber 1n which works a head on the end of the pilot valve rod, and a passage having one end flared and projecting into the admission pipe while the plther end opens into the chamber below the 4. In a safety valve, a hollow main valve with its seating in the blow of pipe, a chamber in which the main valve slides steam tight, narrow passages in the walls of the main valve connecting the space above its seating with the inside of the said valve, a tapering hole in the top wall of the hollow main valve, a Xed tapering rod passing loosely through the said hole, a pilot valve, a series of 'progressively lengthening flutings on the pilot rod immediately below thev valve seat, a passage providing communication between these utings andthe top of the main valve, a chamber in which Works a head on the pilot valve rod, a conduit having one end flared and projecting into the admission pipe while the other end 10 opens into the chamber below thehead, and
means for maintaining the pressure in the chamber above the head the same as that l above the main valve seating.
In testimony whereof I have signed my name to this specification in the presence of 15- I-l. C. CoXE.
US1911642912 1911-08-08 1911-08-08 Safety-valve. Expired - Lifetime US1056562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US1911642912 US1056562A (en) 1911-08-08 1911-08-08 Safety-valve.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1911642912 US1056562A (en) 1911-08-08 1911-08-08 Safety-valve.

Publications (1)

Publication Number Publication Date
US1056562A true US1056562A (en) 1913-03-18

Family

ID=3124816

Family Applications (1)

Application Number Title Priority Date Filing Date
US1911642912 Expired - Lifetime US1056562A (en) 1911-08-08 1911-08-08 Safety-valve.

Country Status (1)

Country Link
US (1) US1056562A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553347A (en) * 1947-12-06 1951-05-15 Beaton & Cadwell Mfg Co Automatic pressure, temperature, and vacuum relief valve
US2571154A (en) * 1944-10-30 1951-10-16 Mercier Jean Servo pressure regulator valve
US2639725A (en) * 1946-04-29 1953-05-26 Roper Corp Geo D Pilot operated relief valve for pumps and the like
US2653624A (en) * 1948-07-21 1953-09-29 Vickers Inc Sequence valve
US2690758A (en) * 1952-09-06 1954-10-05 George W Lee Line valve
US2699316A (en) * 1951-06-27 1955-01-11 Schulz Tool & Mfg Co Valve for controlling the level of fluid in tanks
US2745431A (en) * 1953-06-09 1956-05-15 Garrett Corp Spring rate compensating device for relief valves and actuators
US2840104A (en) * 1953-08-03 1958-06-24 Shafer Valve Co Pressure relief valve
US2923314A (en) * 1955-09-26 1960-02-02 Parker Hannifin Corp Tank filling valve with pressure surge control
US11389680B2 (en) * 2018-04-08 2022-07-19 Agf Manufacturing, Inc. Main valve with pressure relief valve having a lockout feature

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2571154A (en) * 1944-10-30 1951-10-16 Mercier Jean Servo pressure regulator valve
US2639725A (en) * 1946-04-29 1953-05-26 Roper Corp Geo D Pilot operated relief valve for pumps and the like
US2553347A (en) * 1947-12-06 1951-05-15 Beaton & Cadwell Mfg Co Automatic pressure, temperature, and vacuum relief valve
US2653624A (en) * 1948-07-21 1953-09-29 Vickers Inc Sequence valve
US2699316A (en) * 1951-06-27 1955-01-11 Schulz Tool & Mfg Co Valve for controlling the level of fluid in tanks
US2690758A (en) * 1952-09-06 1954-10-05 George W Lee Line valve
US2745431A (en) * 1953-06-09 1956-05-15 Garrett Corp Spring rate compensating device for relief valves and actuators
US2840104A (en) * 1953-08-03 1958-06-24 Shafer Valve Co Pressure relief valve
US2923314A (en) * 1955-09-26 1960-02-02 Parker Hannifin Corp Tank filling valve with pressure surge control
US11389680B2 (en) * 2018-04-08 2022-07-19 Agf Manufacturing, Inc. Main valve with pressure relief valve having a lockout feature

Similar Documents

Publication Publication Date Title
US1056562A (en) Safety-valve.
US257069A (en) Governor for steam-engines
US1231280A (en) Safety-valve.
US1022758A (en) Valve.
US1215947A (en) Automatic drifting-valve for locomotives.
US948445A (en) Non-return-valve mechanism.
US221194A (en) Improvement in safety-valves
US960357A (en) Elastic-fluid turbine.
US1512496A (en) Throttle valve
US1424949A (en) Automatic steam stop valve
US1452155A (en) Automatic liquid valve
US1658031A (en) Pneumatic pump
US474000A (en) Intercepting-valve for compound engines
US536640A (en) mellin
US1873623A (en) Valve
US2248679A (en) Injector
US616539A (en) kaczander
US949294A (en) Regulating-valve.
US714345A (en) Combined vacuum relief-valve.
US842060A (en) Relief-valve for locomotives.
GB103383A (en) Improvements in Safety or Blow-off Valves for Expansible Fluids.
US678427A (en) Automatic controlling-valve.
US1173259A (en) Reduction-valve.
US1206266A (en) Combined by-pass valve and controlling device for engine-cylinders.
US276898A (en) Injector