US1725011A - Steam-control device - Google Patents

Steam-control device Download PDF

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Publication number
US1725011A
US1725011A US249705A US24970528A US1725011A US 1725011 A US1725011 A US 1725011A US 249705 A US249705 A US 249705A US 24970528 A US24970528 A US 24970528A US 1725011 A US1725011 A US 1725011A
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United States
Prior art keywords
valve
pressure
steam
piston
chamber
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
US249705A
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English (en)
Inventor
Menz Gustav
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.)
Siemens Schuckertwerke AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
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Publication of US1725011A publication Critical patent/US1725011A/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
    • F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
    • F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines

Definitions

  • GUSTAV MENZ OF WILHELMSHAVEN, GERMANY, ASSIGNOR TO SIEMENS-SCHUCKERT- WEBKE .AKTIENGESELLSGHAIT, OF BERLIN-SIEMENSSTADT, GERMANY, A COB1'O BATION OF GER-MARY.
  • My invention relates to a steam control device, and more specifically to a valve control gear which is particularly suitable for high-pressure .steam turbines.
  • Control valves for high-pressure steam turbines may be of the single-seat or the double-seat type.
  • Double seat valves have disadvantages in so far as it is almost 1mposssible to keep them absolutely tight, while single seat valves require very strong servo-motors, since the pressure upon the valves is very considerable. This results in very large stem diameters, which in turn cause considerable leakage losses.
  • the object of my invention is to provide a controlgear or regulating device for highpressure steam tur ines, which permits of the use of single seat valves and small servomotors.
  • Fig. 2 represents a slight modification of the valve casin Referring to i 1, 2 is the cone or plug of the control va ve disposed in casing 1 with slight clearance 6 between the enlarged guilclling portion of the value and. the caslng wa
  • the steam to be controlled enters the valve casing through the branch 3 and escapes from it towards the turbine through the branch 4.
  • the steam pressure p in the branch 4 is lower than the pressure p, in the branch 3.
  • the pressure p -This chamber 5 may also be placed in direct communication with the branch 1;, by a throttling pipe 30, controlled by a valve 31, as indicated in Fig. 2.
  • a pipe 21 leads to the balancing device22 and from this device a pipe 23 leads to steam outlet 4 of the valve casing.
  • the suri faces f f f are so proportioned that the instance, be designed as STEAM-CONTROL DEVICE.
  • the balancing device 22 may at first be used as device for opening the main valve. Under these conditions the device itself is closed before starting the turbine. The chamber 5 is in communication with the branch 3 and the main valve is closed. If now the balancing device 22 which may, for and operated valve) is. opened, steam from the branch 3 will flow through chamber 5 and the balancing device 22 by way of its valve 7 into the branch 4. Since the clearance between the guide portion of the valve 2 and the valve casing 1 as well as the balancing device 22 act as throttling members a pressure will exist in the chamber 5 whichv depends upon the size of the cross-sections of the two throttling areas.
  • the size of the first crosssectional area (clearance 6 between the guide portion of thevalve 2 and the valve casing) located between the branch 3 and the chamber 5 is definitely fixed by the construction of the valve.
  • the size of the second cross-sectional area may be adjusted by opening or closing the valve 7 of device 22.
  • the main valve is opened by admitting oil underneath the piston 12 of the servo-motor 8 and then slowly opening the valve 7 of device 22 by any suitable means until the valve 2 rises and takes up the desired position.
  • the mechanism is well adapted for automatic operation, .as the drawing shows.
  • the valve 2 is operated by an oil control piston 12 reciprocating in a cylinder 8 as,prev1ously mentioned.
  • the adjustment of the piston 12 is initiated by a centrifugal governor 10 actuating the control slide piston or pilot valve 9 by means of which oil under pressure is admitted above or below the piston 12, tending to raise or lower valve 2.
  • a centrifugal governor 10 actuating the control slide piston or pilot valve 9 by means of which oil under pressure is admitted above or below the piston 12, tending to raise or lower valve 2.
  • the main valve 2 is to be opened and the pilot valve 9 is in its central position. So long as the valve 7 of the device 22 rests on its seat, the main valve 2 is not balanced and cannotbe opened by the servo-motor piston 12.
  • pilot valve 9 moves downward and admits oil under pressure underneath the piston 12 so that a force tending to open the valve 2 is developed.
  • oil under pressure is forced through the pipe 20 above a second forces oil through the ipe 19 and underservo-motor piston 14sliding in a-cylinder 13 the iston rod 15 of which is moved downward t ereby.
  • This piston rod 15 carries at its lower portion the pilot valves 32 and 33 of a third servo-motor 17, the piston 18'of which operates the valve cone 7 of the balancing device 22.
  • the system shown in the drawing functions automatically to maintain the valve 2 in position, when once adjusted, for the following reasons: Assuming the pressure p, rises. The valve 2 will then have the tendency to ascend. The piston 12 in that case neath the piston 1 .1 and t us pushes that piston-upwards.
  • the piston 14 performs a short upward motion oil under pressure is forcedthrough the pipe 24 above the piston 18iand .the valve 7 is thus closed. This causes the pressure in the chamber 5- to rise wherebythe valve 2 is forced back again to its previously set position.
  • the system thus 'has the tendency to return automatically to its position of e uilibrium.
  • a balancing device by the balancing device is closed the valve isclosed by a loadin pressure itin the closing irection.
  • a balancing device by (p acting upon means of which the steam chambers above and below the valve are adapted to be placed in communication in'such a manner that the placed thereon as are imposed by the prior action of the steam pressure opposing the regulating motion is balanced, and means for automatically regulating said balancing de-. vice in dependence upon the valve motion in such a manner that when said valve tends to 7 open the loading pressure is reduced, and when the device is closed it is increased.
  • a balancing device by means of which the steam chambers above and below the. valve are adapted to be placed in communication, a regulating valve and a control piston for operating it, an auxiliar oil control gear adapted to be operated by I I 5.
  • a valve gear'for controlling the admission of pressure fluid a main valve chamber and a.
  • a balancing device forcontrollin pressure difference between the two sidesofr the valve chamber, above and below the valve by which difference said valve tends to close
  • said balancing device comprising a 115 by-pass connecting the two chamber si and a balancing valve in said bypass, operating means for setting said main valve into the desired position, and means actuated by the motion of the main .valve for operating said pressure said balancing valveqto reduce diflerence when the main valve tends to close, and to increase said difference when the main .valvetends to open beyond the position for which it was set.
  • a valve gear for controlling the ad- 125 mission of pressure fluid
  • a main valve chamber and an unbalanced main valve disposed thereln a mam servo-motor for operating said main valve
  • a pilot device actua" the loading pressure is the ated by outside means for controlling the action of said main servo-motor, an equalizing connection between the two sides of the main valve for balancing said valve, a
  • control valve in said connection for controlling the balancing effect, a second servomotor for operating said controlling valve, and a second pilot device for controlling said second servo-motor, an auxiliary servomotor for actuating said second pilot device, said auxiliary motor being piloted by said main servo-motor and its pertaining pilot device.
  • a valve gear for controlling the admission of pressure fluid,- a main valve chamber and an unbalanced main valve disposed therein and having a fluid leakage t e path from the fluid supply portion of chamber towards the side of the valve opposite to its fluid discharge side, to produce a desired seating pressure upon the valve, a main servo-motor for operating said main valve, a pilot device actuated by outside means for controlling the action of said servo-motor, an equalizing connection be tween the two sides of the main valve for balancing said valve, a control valve in said connection for controlling the balancing effect, a second servo-motor for operating said controlling valve, and a second pilot device for controlling said second servo-motor, an auxiliary servo-motor for actuating said second pilot device, said auxiliary motor being piloted by said main servo-motor and its pilot device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
US249705A 1926-09-11 1928-01-26 Steam-control device Expired - Lifetime US1725011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE277368T 1926-09-11

Publications (1)

Publication Number Publication Date
US1725011A true US1725011A (en) 1929-08-20

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ID=31893763

Family Applications (1)

Application Number Title Priority Date Filing Date
US249705A Expired - Lifetime US1725011A (en) 1926-09-11 1928-01-26 Steam-control device

Country Status (2)

Country Link
US (1) US1725011A (enrdf_load_stackoverflow)
GB (1) GB277368A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070000A (en) * 1974-09-11 1978-01-24 Atwood & Morrill Co. Fluid operated valve
US20160290173A1 (en) * 2013-12-18 2016-10-06 Mitsubishi Heavy Industries, Ltd. Adjusting valve drive mechanism and steam turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070000A (en) * 1974-09-11 1978-01-24 Atwood & Morrill Co. Fluid operated valve
US20160290173A1 (en) * 2013-12-18 2016-10-06 Mitsubishi Heavy Industries, Ltd. Adjusting valve drive mechanism and steam turbine

Also Published As

Publication number Publication date
GB277368A (enrdf_load_stackoverflow) 1928-02-23

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