US3601357A - Actuators for pressure loaded valves - Google Patents

Actuators for pressure loaded valves Download PDF

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Publication number
US3601357A
US3601357A US850914A US3601357DA US3601357A US 3601357 A US3601357 A US 3601357A US 850914 A US850914 A US 850914A US 3601357D A US3601357D A US 3601357DA US 3601357 A US3601357 A US 3601357A
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United States
Prior art keywords
valve
piston
cylinder
pressure
lever arm
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
US850914A
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English (en)
Inventor
Edouard Legille
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Paul Wurth SA
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Anciens Etablissements Paul Wurth SA
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    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/002—Evacuating and treating of exhaust gases
    • C21B7/005—Bleeder valves or slides
    • 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
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F16K17/19—Equalising valves predominantly for tanks

Definitions

  • ABSTRACT Hydromechanical control devices for valves which are normally held in the closed position against applied 54] ACTUATORS FOR PRESSURE LOADED VALVES fluid pressure are disclosed.
  • the control devices include a differennal area piston mechanically linked to the valve and v 2 Claims, 2 Drawing Figs.
  • ACTUATORS FOR PRESSURE LOADED VALVES BACKGROUND OF THE INVENTION bleed or pressure relief valves which are installed at the throat of a blast furnace.
  • the present invention has also been found to be useful in the control of admission and exhaust valves for gas pressure equalizing chambers at blast furnace throats.
  • Prior art bleed valves of the type characterized by a mushroom-type obturator valve head which opens outwardly are maintained in the normally closed position by counterweights or spring assemblies; these mechanical devices compensating for the pressure of the blast furnace gases on the valve head.
  • the closing forces imparted by the weights or springs must, of course, insure hermeticity when the valve is closed by means of exerting a closing force on the valve head which is suff ciently in excess of the counterpressure exerted by the furnace gases.
  • the prior art valves are opened, according to the particular system adopted, by a hand an cable winch, an electrohydraulic thrust device, a hydraulic cylinder connected either to a ram pump or to a set of hydraulic accumulators, by a pneumatic cylinder, by any other suitable operating device or by a combination of two or more of the aforementioned devices.
  • the prior art bleeder valve control systems were characterized by mechanical means, such as springs, for closing the valves and by hydraulic means such as hydraulic cylinder connected to a set of hydroelastic accumulators, for opening the valves.
  • the valve opening mechanisms have typically included means whereby the opening of the valve is controlled automatically by the pressure of the blast furnace gases at the throat of the furnace.
  • Such control means may, for example, comprise a system of adjustable pressostats which control the operation of the hydraulic cylinders to stop and start the admission of oil under pressure to the cylinder.
  • the desired operational mode requires that the bleeder valves be opened at an intermediate pressure, the opening being achieved by overcoming the closing forces applied by the springs or other mechanical means. Opening should, of course, be at a pressure below that at which the pressostats have been preset and at which the. pressure of the furnace gases will overcome the mechanical closing forces.
  • the present invention overcomes the foregoing and other deficiencies and disadvantages of the prior art by providing a bleed or pressure relief valve control mechanism which does not rely upon mechanical forces for maintaining the valve in the normally closed position.
  • the function of the spring or other mechanical assemblies of the prior art is performed by the hydraulic cylinder which formerly served only to open the valve.
  • the hydraulic cylinder is thus adapted to new conditions of operation in such a manner as to receive, on the rod or smaller area side of the piston, a pressure which is sufficiently large to subject the valve head to the stresses which were formerly applied thereto, under the same operating conditions, by the spring or other mechanical assemblies of the prior art.
  • the opening of the valve will be effected by the application of fluid from a pressurized source to the head or large area side of the hydraulic cylinder piston.
  • a differential area piston is employed and the source from which pressure is applied to both sides of the piston may be the same accumulator system. Accordingly, the opening of the valve will be accomplished by means of a force unbalance which results from the application of pressurized fluid, usually from the same source, to the opposite and different active area ends of the piston.
  • a hydroelastic system similar to that described above is applied to valves employed for equalizing the pressure between blast furnace top bells, i.e. to the admission and exhaust valves of a double-bell-hopper arrangement.
  • the most suitable valves presently available are also characterized by a mushroom-type obturator which is closed and maintained in the normally closed position by a spring assembly, the obturator being opened toward the outside by means of a hydraulic cylinder connected to hydroelastic accumulators.
  • FIG. 1 is a schematic diagram of a first embodiment of the present invention, the embodiment of FIG. 1 being shown in the environment of a bleed or pressure relief valve at the throat of a blast furnace;
  • FIG. 2 is a schematic diagram of a second embodiment of the present invention, the valve control system of FIG. 2 being shown in the environment of a valve for equalizing the pressure between the top bells of a blast furnace.
  • valve body 1 the body of a bleed pressure relief valve, as is typically found mounted on the gas takeoff at the throat of a blast furnace, is indicated generally at l.
  • the valve body 1 comprises a valve seat 2 and a mushroom-type obturator or valve head 3.
  • the obturator will typically have a deflector, not shown, that will cooperate with seat 2 to seal the gas takeoff port when the valve is in the closed position as shown.
  • the obturator 3 is connected, via a rod 4, to a control lever 5.
  • Control lever 5 is pivotable about a fixed pivot point 6.
  • Hydraulic cylinder 7 is of the double-acting type and is connected on both its rod side and head side to the same system of hydroelastic accumulators 9.
  • the pressure of the gas at the throat of the blast furnace will act on obturator 3 and tend to open the normally closed valve outwardly.
  • the load to which the obturator 3 is subjected by the pressure of the gas at the blast furnace throat is counterbalanced by a greater force exerted in the opposite direction via control lever 5 and rod 4.
  • This closing pressure is a resultant of the application of pressure from the accumulator system 9 to the rod or smaller area end of the piston in cylinder 7.
  • the pressure on the free face of the piston is relieved by placing the head end of cylinder 7 in communication with an outlet 10 via diversion valve 11.
  • the piston will accordingly descend, under the action of the hydroelastic pressure maintained on the rod side thereof, and the obturator 3 is reseated.
  • the ends of the hydraulic cylinder can be connected to two separate hydroelastic accumulator systems which exert equal or different pressures on the two faces of the piston in the cylinder.
  • the pressure in the accumulator system or systems can be regulated within a wide range, for example by means of a control valve 12, and such pressure regulation may be done in complete safety in a hydraulic control room.
  • the ability to remotely control the system provides a decided advantage in the event of an unexpected opening of the valve I; particularly when compared with prior art systems wherein the spring assembly had to be regulated locally.
  • a power closing apparatus may also be employed in accordance with the present invention. If included, the power closing apparatus applies an additional force to the seal at the moment of closing of valve I, through the application of pressure to the rod side of the. piston, which is slightly in excess of that supplied by the accumulator system 9.
  • the power closing apparatus will comprise a suitable valve system and source of hydraulic pressure.
  • an auxiliary spring 14 calibrated to the normal effective pressure of the gas at the throat, i.e. 0.2%.3 kg./cm. can be employed in order to close the valve in the event ofany failure in the hydroelastic system.
  • An operating device based on the use ofa cable winch, as shown schematically at 15, may be installed in order to effect opening operation in the event of any failure or breakdown in the hydroelastic system.
  • system as described may be controlled remotely by various means such as the use of a solenoid 16 to control diversion valve 11.
  • a solenoid 16 to control diversion valve 11.
  • Other remote and/or automatic control arrangements will be obvious to those skilled in the art.
  • FIG. 2 shows a second embodiment of the present invention similar to that described above; the embodiment of FIG. 2 being shown in the environment of a valve used for equalizing the pressure between the top-bells at the throat of a blast furnace.
  • the valve body 17 is mounted on the lock chamber between the top-bells of a blast furnace and, in the event of the operation of valve 17 as an admission valve, is connected to an equalization gas supply conduit.
  • the valve body 17 is fitted with a seat 18 on which is mounted a mushroom-type obturator 19.
  • the obturator 19 is attached to a piston rod which is in turn connected to the differential area piston in a double-acting hydraulic cylinder 7.
  • the cylinder 7 is characterized by a pair of piston rods which extend from either end' thereof. The largest effective surface area of the piston in cylinder 7 is provided by the end from which the piston rod connected to obturator 19 extends.
  • the larger diameter rod i.e. the rod extending from the end of the piston in cylinder 7 having the smaller effective area
  • Spring 20 is calibrated to the effective pressure which the gas assumes at the blast furnace throat in the event of the furnace operating without any counterpressure at the throat.
  • valve '11 To reclose the opened valve, the lower end of cylinder 7 is placed in communication with an outlet 10 via a diversion valve '11. The piston will accordingly descend, under the effect of the hydroelastic pressure maintained on the other side of the piston, and the obturator 19 will be reseated against valve seat 18.
  • valve 17 at the rhythm selected for the valves of the pressure equalization system between the furnace top-bells, is controlled by an automatic servocontrol system, indicated schematically at 16, in accordance with the sequence of the blast furnace charging program.
  • valve control apparatus in accordance with the present invention is applicable both to the admission valve and to the exhaust valve of the pressure equalizing system at the blast furnace throat.
  • An actuator for a normally closed valve said valve including a valve head and a seat and said valve head normally being subjected to forces in the opening direction, said actuator comprising:
  • a differential area piston disposed in said cylinder, said piston being in sealing relationship to the walls of said cylinder and having a piston rod which extends out of a first end of the cylinder from the smaller area end of said piston;
  • said connecting means including a lever arm mounted for pivoting about a first end and means connecting said lever arm to said piston rod adjacent the other end of said lever arm, said valve head being connected to said lever arm intermediate said first end and said piston rod connection;
  • a source of pressurized fluid including hydraulic accumulator means
  • valve means connected between accumulator means output and the other end of said cylinder, said valve means having a first operative state whereby said second end of said cylinder may be placed into communication with said accumulator means and the pressurized fluid will act on the larger area end of said piston and said piston will be caused to move in a first direction thereby opening said valve, said valve means having a second operative state whereby fluid in said cylinder at said larger area side of said piston may be relieved and said valve will be urged in the closed direction through the action of said fluid on said smaller area end of said piston.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Safety Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)
  • Blast Furnaces (AREA)
  • Lift Valve (AREA)
US850914A 1968-08-19 1969-08-18 Actuators for pressure loaded valves Expired - Lifetime US3601357A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU56736A LU56736A1 (de) 1968-08-19 1968-08-19

Publications (1)

Publication Number Publication Date
US3601357A true US3601357A (en) 1971-08-24

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ID=19725697

Family Applications (1)

Application Number Title Priority Date Filing Date
US850914A Expired - Lifetime US3601357A (en) 1968-08-19 1969-08-18 Actuators for pressure loaded valves

Country Status (9)

Country Link
US (1) US3601357A (de)
JP (1) JPS4813486B1 (de)
BE (1) BE737595A (de)
DE (1) DE1941820C3 (de)
ES (1) ES370588A1 (de)
FR (1) FR2015901A1 (de)
GB (1) GB1279855A (de)
LU (1) LU56736A1 (de)
NL (1) NL168040C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818418A1 (de) 2006-02-09 2007-08-15 Paul Wurth S.A. Entlüftungsventil für im Überdruck betriebene Öfen
WO2010133623A1 (en) 2009-05-19 2010-11-25 Paul Wurth S.A. Arrangement for burning blast furnace off-gas from a bleeder valve and corresponding bleeder valve
CN102410554A (zh) * 2011-11-07 2012-04-11 长沙锅炉厂有限责任公司 一种锅炉的防喷火装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1025836A (en) * 1974-07-22 1978-02-07 Norman F. Prescott Closing assist for valves
GB2227822B (en) * 1989-02-04 1993-05-26 Copermill Ltd Improvements in or relating to safety apparatus
US10543060B2 (en) 2015-12-03 2020-01-28 Ormco Corporation Fluted endodontic file

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1198635A (en) * 1915-05-18 1916-09-19 Westinghouse Machine Co Heat-balancing valve.
US1512804A (en) * 1924-10-21 Automatic begtti
US2848873A (en) * 1954-11-26 1958-08-26 Keelavite Co Ltd Apparatus for causing intermittent operation of a hydraulic motor
US3155365A (en) * 1960-10-28 1964-11-03 Hartung Pressure medium controlled liquid valve for automatic flow limitation devices
US3375658A (en) * 1966-01-21 1968-04-02 Hardwicke Etter Co Pump control system for cotton press
US3467129A (en) * 1965-03-31 1969-09-16 Jean Louis Gratzmuller Hydraulically-operated valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1512804A (en) * 1924-10-21 Automatic begtti
US1198635A (en) * 1915-05-18 1916-09-19 Westinghouse Machine Co Heat-balancing valve.
US2848873A (en) * 1954-11-26 1958-08-26 Keelavite Co Ltd Apparatus for causing intermittent operation of a hydraulic motor
US3155365A (en) * 1960-10-28 1964-11-03 Hartung Pressure medium controlled liquid valve for automatic flow limitation devices
US3467129A (en) * 1965-03-31 1969-09-16 Jean Louis Gratzmuller Hydraulically-operated valve
US3375658A (en) * 1966-01-21 1968-04-02 Hardwicke Etter Co Pump control system for cotton press

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818418A1 (de) 2006-02-09 2007-08-15 Paul Wurth S.A. Entlüftungsventil für im Überdruck betriebene Öfen
WO2007090747A1 (en) * 2006-02-09 2007-08-16 Paul Wurth S.A. Bleeder valve for pressurised furnace
EA012646B1 (ru) * 2006-02-09 2009-12-30 Поль Вурт С.А. Атмосферный клапан для шахтной печи
AU2007213830B2 (en) * 2006-02-09 2010-06-24 Paul Wurth S.A. Bleeder valve for pressurised furnace
US20100201051A1 (en) * 2006-02-09 2010-08-12 Paul Wurth S.A. Bleeder valve for pressurized furnace
CN101379199B (zh) * 2006-02-09 2011-09-21 保尔伍斯股份有限公司 用于高压炉的泄放阀
US8034284B2 (en) 2006-02-09 2011-10-11 Paul Wurth S.A. Bleeder valve for pressurized furnace
KR101236997B1 (ko) * 2006-02-09 2013-02-25 풀 부르스 에스.에이. 가압된 노를 위한 배출밸브
TWI402351B (zh) * 2006-02-09 2013-07-21 Wurth Paul Sa 豎爐排氣閥
WO2010133623A1 (en) 2009-05-19 2010-11-25 Paul Wurth S.A. Arrangement for burning blast furnace off-gas from a bleeder valve and corresponding bleeder valve
US8940226B2 (en) 2009-05-19 2015-01-27 Paul Wurth S.A. Arrangement for burning blast furnace off-gas from a bleeder valve and corresponding bleeder valve
CN102410554A (zh) * 2011-11-07 2012-04-11 长沙锅炉厂有限责任公司 一种锅炉的防喷火装置

Also Published As

Publication number Publication date
NL6912633A (de) 1970-02-23
GB1279855A (en) 1972-06-28
ES370588A1 (es) 1971-04-16
NL168040B (nl) 1981-09-16
JPS4813486B1 (de) 1973-04-27
DE1941820A1 (de) 1970-02-26
FR2015901A1 (de) 1970-04-30
LU56736A1 (de) 1968-11-21
NL168040C (nl) 1982-02-16
BE737595A (de) 1970-02-02
DE1941820C3 (de) 1975-09-25
DE1941820B2 (de) 1975-02-13

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