WO1981000064A1 - Pneumatic diaphragm valve pulsator - Google Patents

Pneumatic diaphragm valve pulsator Download PDF

Info

Publication number
WO1981000064A1
WO1981000064A1 PCT/SE1980/000184 SE8000184W WO8100064A1 WO 1981000064 A1 WO1981000064 A1 WO 1981000064A1 SE 8000184 W SE8000184 W SE 8000184W WO 8100064 A1 WO8100064 A1 WO 8100064A1
Authority
WO
WIPO (PCT)
Prior art keywords
compartment
valve
back pressure
diaphragm
pulsator
Prior art date
Application number
PCT/SE1980/000184
Other languages
French (fr)
Inventor
C Nilsson
Original Assignee
Kockumation Ab
C Nilsson
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 Kockumation Ab, C Nilsson filed Critical Kockumation Ab
Priority to AU61230/80A priority Critical patent/AU6123080A/en
Publication of WO1981000064A1 publication Critical patent/WO1981000064A1/en

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
    • G10K9/04—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated by compressed gases, e.g. compressed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/12—Fluid oscillators or pulse generators

Definitions

  • the invention relates to a pneumatic diaphragm valve pulsator comprising a housing and a diaphragm clamped therein, which engages at one side thereof an annular seat between an inlet compartment and an outlet compartment for pressurized gas, said compartments being defined in the housing at said one side of the diaphragm while a back pressure compartment is defined in the housing at the other side of the diaphragm.
  • the invention has been particularly devised for such diaphragm valve pulsators which are used for activating dust and pulverulent material by means of powerful high-speed pulses in the frequency range from 0 to 50 Hz.
  • Frequencies within this range in the infrasound range (from 0 to 20 Hz) as well as the audible range (from 20 to 50 Hz) are used e.g. in fiuidizing pulverulent material and in cleaning steam boilers, hot-water boilers, electro-filters, etc.
  • a drawback of such an aperture is that so-called critical flow can arise through the aperture and that the operation of the pulsator can be jeopardized as a consequence thereof.
  • diaphragm valve sirenes with a resonance horn a connection between the back pressure compartment and the inlet compartment either as an aperture in the diaphragm or as a connection passage, possibly adjust able, in the housing.
  • This connection in that case is used not for controlling the frequency of the sirene, which is determined by the resonance oscillation in the resonance horn, but is provided for adjusting the gas pressure in the back pressure compartment to such a value lower than the gas pressure in the inlet compartment that the diaphragm oscillates stably with a suitable amplitude in pace with the resonance oscillation in the resonance horn.
  • the purpose of the. invention is to make possible a stepless frequency control in a diaphragm valve pulsator of the type referred to above while maintaining a stable pulsation and a reliable operation within the entire frequency range of the pulsator.
  • connection between the inlet compartment and the back pressure compartment provides balance in the back pressure compartment particularly at high-speed pulses.
  • the pulsator provides a more stable pulsation than known pulsators of the type referred to above and at the same time the frequency can be adjusted continuously by controlling the connection between the outlet compartment and the back pressure compartment without the influence by external means.
  • FIG. 1 is an axial cross-sectional view, partly a side view, of a pneumatic diaphragm valve pulsator according to one embodiment of the invention
  • FIG. 2 is a view corresponding to that in FIG. 1, which illustrates the functional condition when the pulsator is shut-off,
  • FIG. 3 is a view corresponding to that in FIG. 1 illustrating the functional condition when the pulsator is operating
  • FIG. 4 is a view corresponding to that in FIG. 1 of another embodiment of the diaphragm valve pulsator according to the invention.
  • the diaphragm valve pulsator according to FIG. 1 comprises a housing which consists of a cylindrical cup-shaped bottom part 10 and a cover 11. Between the parts 10 and 11 a diaphragm 12 located in the housing is clamped at the periphery thereof between O-rings 13 received by annular grooves in the bottom part 10 and the cover 11, respectively. Thus, the diaphragm is elastically clamped.
  • an annular seat 15 which is normally sealingly engaged by the diaphragm 12, and inside this annular seat the bottom part 10 forms an inlet compartment 15 having an inlet 17 to be connected to a conduit for the supply of pressurized gas, while the bottom part forms around the seat 15 an annular outlet compartment 18 having an outlet opening 19 to be connected to a conduit for supplying pulses from the pulsator.
  • a back pressure compartment 20 is provided between the diaphragm and the cover 11, said back pressure compartment permanently communicating with the inlet compartment 16 through a small aperture 21 which is formed centrally in the diaphragm 12.
  • the back pressure compartment 20 is also connected to the outlet compartment 18 but through a valve-controlled connection.
  • This valve-controlled connection comprises a passage 22 in the cover 11, which is connected to a solenoid valve 23 mounted on top of the cover, a passage 24 also formed in the cover 11 and connected to the solenoid valve 23, and a passage 25 formed in the bottom part 10 as an extension of the passage 24.
  • the passage 25 communicates with the outlet compartment 18.
  • the valve member 26 of the solenoid valve 23 keeps the connection between the passages 22 and 24 closed when the solenoid valve is de-energized, such connection consequently being open when the solenoid valve is energized.
  • While the solenoid valve 23 thus keeps the connection between the back pressure compartment 20 and the outlet compartment 18 open or closed depending on the solenoid valve 23 being energized or de-energized, there is a control valve for adjusting the magnitude of the flow which can pass through the connection 22, 24, 25 when the solenoid valve 23 is energized and thus is in open position.
  • This valve comprises a socket 27 connected by welding to the bottom part 10, and a control screw 28 having a control tip 29 is screwed thereinto, a sealing packing box 30 being provided around the screw 28.
  • FIG. 2 The functional condition of the diaphragm valve pulsator when the pulsator is out of operation and accordingly no pulses are supplied from the pulsator, is illustrated in FIG. 2.
  • the solenoid valve 23 is de-energized and accordingly the valve member 26 thereof keeps the connection between the back pressure compartment 20 and the outlet compartment 18 closed.
  • a conduit 31 for pressurized gas is connected to the inlet 17 such that not only the inlet compartment 16 but also the back pressure compartment 20 is pressurized, because there is a connection between these two compartments through the aperture 21.
  • the diaphragm 12 in the back pressure compartment 20 is larger than the pressure area of the diaphragm in the inlet compartment 16 the diaphragm is held pressed against the annular seat 15 and the outlet compartment 18 thus is. separated from the inlet compartment 16 by means of the diaphragm.
  • the valve member 26 keeps the connection between the back pressure compartment 20 and the outlet compartment 18 open through the passages 22, 24, 25 via the choke valve 29, which means that the pressure in the back pressure compartment 20 will be relieved by pressurized gas escaping from this compartment to the outlet compartment 18.
  • the diaphragm 12 will be lifted from the seat 15 by the pressure at the lower side of the diaphragm such that pressurized gas can flow from the inlet compartment 16 to the outlet compartment 18 and to the outside therefrom through a conduit 32 connected to the outlet 19.
  • the connection between the inlet compartment 16 and the outlet compartment 18 will again be closed to be opened again later when the pressure in the back pressure compartment has been relieved through the connection 22, 24, 25.
  • the diaphragm 12 will open and close the connection between the inlet compartment 16 and the outlet compartment 18 at a predetermined frequency for the supply of pressurized gas pulses at that frequency through the conduit 32 as long as the solenoid valve 23 is energized and the valve member 26 is maintained in the open position.
  • the function of the inlet compartment 16 is to store the pressurized gas as close as possible to the outlet 19, pressure drop over the seat 15 when a pulse is supplied being eliminated thereby, while the function of the outlet compartment 18 is to provide a flow of the pressurized gas which is as free and pressure-reducing as possible.
  • the choke valve 29 forms a member for stepless control of the frequency at which the diaphragm 12 opens and closes the connection between the inlet compartment 16 and the outlet compartment 18, and thus the frequency at which pressurized gas pulses are supplied from the pulsator.
  • the pressurized gas in the back pressure compartment 20 is also matched to the desired pulse frequency and some replenishment with pressurized gas to the back pressure compartment through the passages 22, 24, 25 is obtained until the pressure required in order that the diaphragm shall close against the seat 15, has been obtained.
  • the aperture 21 in the pneumatic diaphragm valve pulsator according to the invention is not used for controlling the frequency of the pulsator.
  • This aperture is used to provide balance in the back pressure compartment 20 particularly at high-speed pulses, which means that a more stable pulsation is obtained in the pulsator as compared with conventional pneumatic diaphragm valve pulsators.
  • the solenoid valve 23 which is used to start and stop the pulsator, does not necessarily operate with the total drive gas flow of the pulsator but only with the negligible flow between the back pressure compartment 20 and the outlet compartment 18, this valve can be of a relatively tiny embodiment, which involves an important advantage as to economy.
  • the solenoid valve 23 By means of the solenoid valve 23 the pulsator is started and stopped quickly and distinctly.
  • the aperture 21 in the diaphragm 12 is replaced by a valve-controlled connection between the inlet 17 (inlet compartment 16) and the back pressure compartment 20.
  • This connection comprises a passage 33 in the bottom part 10 and a passage 34 in the cover 11, communicating therewith.
  • the choke valve is of the same embodiment as the valve provided for controlling the flow through the connection 22, 24, 25 and has been designated generally with 35.
  • the choke valve 35 is adjusted to' a slightly open position such that the pressure in the back pressure compartment 20 is maintained continuously by the supply of pressurized gas from the inlet compartment 16.
  • the frequency is adjusted in the same manner as described earlier by adjustment of the valve 29.
  • connection 33, 34 is choked by means of the valve 35, the connection 22, 24, 25 at the same time being choked in order to adjust the pulsator to a lower frequency, and as a consequence thereof the pressurized gas in the back pressure compartment 20 will be replenished very slowly.

Abstract

The pulsator comprises a housing (10, 11) with a diaphragm (12) clamped therein, which engages at one side thereof a seat (15) between an inlet compartment (16) and an outlet compartment (18) for pressurized gas. At the other side of the diaphragm there is a back pressure compartment (20) in the housing. The back pressure compartment has a choked connection with the inlet compartment (connection 21; 33, 34) as well as the outlet compartment (connection 22, 24, 25). In said latter connection (23) a shut-off valve (23) is provided.

Description

PNEUMATIC DIAPHRAGM VALVE PULSATOR
The invention relates to a pneumatic diaphragm valve pulsator comprising a housing and a diaphragm clamped therein, which engages at one side thereof an annular seat between an inlet compartment and an outlet compartment for pressurized gas, said compartments being defined in the housing at said one side of the diaphragm while a back pressure compartment is defined in the housing at the other side of the diaphragm.
The invention has been particularly devised for such diaphragm valve pulsators which are used for activating dust and pulverulent material by means of powerful high-speed pulses in the frequency range from 0 to 50 Hz. Frequencies within this range in the infrasound range (from 0 to 20 Hz) as well as the audible range (from 20 to 50 Hz) are used e.g. in fiuidizing pulverulent material and in cleaning steam boilers, hot-water boilers, electro-filters, etc. It is known to provide in pneumatic diaphragm valve pulsators of the type referred to above an aperture in the diaphragm between the back pressure compartment and the outlet compartment, the frequency of the pulsator being dependent on the size of the aperture. The greater the aperture, the higher the pulsator frequency. A drawback of such an aperture is that so-called critical flow can arise through the aperture and that the operation of the pulsator can be jeopardized as a consequence thereof.
It is also previously known to provide in diaphragm valve sirenes with a resonance horn a connection between the back pressure compartment and the inlet compartment either as an aperture in the diaphragm or as a connection passage, possibly adjust able, in the housing. This connection in that case is used not for controlling the frequency of the sirene, which is determined by the resonance oscillation in the resonance horn, but is provided for adjusting the gas pressure in the back pressure compartment to such a value lower than the gas pressure in the inlet compartment that the diaphragm oscillates stably with a suitable amplitude in pace with the resonance oscillation in the resonance horn. Finally, for controlling diaphragm sirenes at signalling it is also previously known to provide a valve for relieving the pressure in the back pressure compartment by connecting said compartment to the surroundings via this valve; this provides the advantage that the control valve can have small dimensions.
The purpose of the. invention is to make possible a stepless frequency control in a diaphragm valve pulsator of the type referred to above while maintaining a stable pulsation and a reliable operation within the entire frequency range of the pulsator.
For this purpose the pulsator according to the invention has obtained the characteristics appearing from claim 1.
By this arrangement the connection between the inlet compartment and the back pressure compartment provides balance in the back pressure compartment particularly at high-speed pulses. Thereby the pulsator provides a more stable pulsation than known pulsators of the type referred to above and at the same time the frequency can be adjusted continuously by controlling the connection between the outlet compartment and the back pressure compartment without the influence by external means.
Two embodiments of the invention will be described in more detail below, reference being made to the accompanying drawings in which
FIG. 1 is an axial cross-sectional view, partly a side view, of a pneumatic diaphragm valve pulsator according to one embodiment of the invention,
FIG. 2 is a view corresponding to that in FIG. 1, which illustrates the functional condition when the pulsator is shut-off,
FIG. 3 is a view corresponding to that in FIG. 1 illustrating the functional condition when the pulsator is operating, and
FIG. 4 is a view corresponding to that in FIG. 1 of another embodiment of the diaphragm valve pulsator according to the invention. The diaphragm valve pulsator according to FIG. 1 comprises a housing which consists of a cylindrical cup-shaped bottom part 10 and a cover 11. Between the parts 10 and 11 a diaphragm 12 located in the housing is clamped at the periphery thereof between O-rings 13 received by annular grooves in the bottom part 10 and the cover 11, respectively. Thus, the diaphragm is elastically clamped.
Centrally in the bottom part 10 there is provided an annular seat 15 which is normally sealingly engaged by the diaphragm 12, and inside this annular seat the bottom part 10 forms an inlet compartment 15 having an inlet 17 to be connected to a conduit for the supply of pressurized gas, while the bottom part forms around the seat 15 an annular outlet compartment 18 having an outlet opening 19 to be connected to a conduit for supplying pulses from the pulsator.
At the other side of the diaphragm, which is opposite to the annular seat 15, a back pressure compartment 20 is provided between the diaphragm and the cover 11, said back pressure compartment permanently communicating with the inlet compartment 16 through a small aperture 21 which is formed centrally in the diaphragm 12. The back pressure compartment 20 is also connected to the outlet compartment 18 but through a valve-controlled connection.
This valve-controlled connection comprises a passage 22 in the cover 11, which is connected to a solenoid valve 23 mounted on top of the cover, a passage 24 also formed in the cover 11 and connected to the solenoid valve 23, and a passage 25 formed in the bottom part 10 as an extension of the passage 24. The passage 25 communicates with the outlet compartment 18. The valve member 26 of the solenoid valve 23 keeps the connection between the passages 22 and 24 closed when the solenoid valve is de-energized, such connection consequently being open when the solenoid valve is energized.
While the solenoid valve 23 thus keeps the connection between the back pressure compartment 20 and the outlet compartment 18 open or closed depending on the solenoid valve 23 being energized or de-energized, there is a control valve for adjusting the magnitude of the flow which can pass through the connection 22, 24, 25 when the solenoid valve 23 is energized and thus is in open position. This valve comprises a socket 27 connected by welding to the bottom part 10, and a control screw 28 having a control tip 29 is screwed thereinto, a sealing packing box 30 being provided around the screw 28. By screwing the screw 28 more or less into the passage 25 the flow through the connection between the back pressure compartment 20 and the outlet compartment 18 can be choked more or less.
The functional condition of the diaphragm valve pulsator when the pulsator is out of operation and accordingly no pulses are supplied from the pulsator, is illustrated in FIG. 2. In this functional condition the solenoid valve 23 is de-energized and accordingly the valve member 26 thereof keeps the connection between the back pressure compartment 20 and the outlet compartment 18 closed. A conduit 31 for pressurized gas, usually pressurized air, is connected to the inlet 17 such that not only the inlet compartment 16 but also the back pressure compartment 20 is pressurized, because there is a connection between these two compartments through the aperture 21. Since the pressure area of the diaphragm 12 in the back pressure compartment 20 is larger than the pressure area of the diaphragm in the inlet compartment 16 the diaphragm is held pressed against the annular seat 15 and the outlet compartment 18 thus is. separated from the inlet compartment 16 by means of the diaphragm.
Now, if the solenoid valve is energized, the functional condition in FIG. 3 will be obtained. In this case the valve member 26 keeps the connection between the back pressure compartment 20 and the outlet compartment 18 open through the passages 22, 24, 25 via the choke valve 29, which means that the pressure in the back pressure compartment 20 will be relieved by pressurized gas escaping from this compartment to the outlet compartment 18. As a consequence thereof the diaphragm 12 will be lifted from the seat 15 by the pressure at the lower side of the diaphragm such that pressurized gas can flow from the inlet compartment 16 to the outlet compartment 18 and to the outside therefrom through a conduit 32 connected to the outlet 19.
When the pressure in the back pressure compartment 20 has increased again sufficiently due to the connection through the aperture 21 in order that the diaphragm 12 shall again be pressed against the seat 15 thereof, the connection between the inlet compartment 16 and the outlet compartment 18 will again be closed to be opened again later when the pressure in the back pressure compartment has been relieved through the connection 22, 24, 25. Thus, the diaphragm 12 will open and close the connection between the inlet compartment 16 and the outlet compartment 18 at a predetermined frequency for the supply of pressurized gas pulses at that frequency through the conduit 32 as long as the solenoid valve 23 is energized and the valve member 26 is maintained in the open position.
The function of the inlet compartment 16 is to store the pressurized gas as close as possible to the outlet 19, pressure drop over the seat 15 when a pulse is supplied being eliminated thereby, while the function of the outlet compartment 18 is to provide a flow of the pressurized gas which is as free and pressure-reducing as possible.
The choke valve 29 forms a member for stepless control of the frequency at which the diaphragm 12 opens and closes the connection between the inlet compartment 16 and the outlet compartment 18, and thus the frequency at which pressurized gas pulses are supplied from the pulsator. The more open the choke valve 29 is, the higher will the frequency be. However, the pressurized gas in the back pressure compartment 20 is also matched to the desired pulse frequency and some replenishment with pressurized gas to the back pressure compartment through the passages 22, 24, 25 is obtained until the pressure required in order that the diaphragm shall close against the seat 15, has been obtained.
Thus, it should be observed that the aperture 21 in the pneumatic diaphragm valve pulsator according to the invention is not used for controlling the frequency of the pulsator. This aperture is used to provide balance in the back pressure compartment 20 particularly at high-speed pulses, which means that a more stable pulsation is obtained in the pulsator as compared with conventional pneumatic diaphragm valve pulsators.
Since the solenoid valve 23 which is used to start and stop the pulsator, does not necessarily operate with the total drive gas flow of the pulsator but only with the negligible flow between the back pressure compartment 20 and the outlet compartment 18, this valve can be of a relatively tiny embodiment, which involves an important advantage as to economy. By means of the solenoid valve 23 the pulsator is started and stopped quickly and distinctly.
In the embodiment according to FIG. 4 the aperture 21 in the diaphragm 12 is replaced by a valve-controlled connection between the inlet 17 (inlet compartment 16) and the back pressure compartment 20. This connection comprises a passage 33 in the bottom part 10 and a passage 34 in the cover 11, communicating therewith. The choke valve is of the same embodiment as the valve provided for controlling the flow through the connection 22, 24, 25 and has been designated generally with 35. In this embodiment of the pneumatic diaphragm valve pulsator there are greater possibilities of stabilizing the operation of the pulsator within the frequency range thereof. For high-speed pulses the choke valve 35 is adjusted to' a slightly open position such that the pressure in the back pressure compartment 20 is maintained continuously by the supply of pressurized gas from the inlet compartment 16. However, the frequency is adjusted in the same manner as described earlier by adjustment of the valve 29.
For low-speed pulses the connection 33, 34 is choked by means of the valve 35, the connection 22, 24, 25 at the same time being choked in order to adjust the pulsator to a lower frequency, and as a consequence thereof the pressurized gas in the back pressure compartment 20 will be replenished very slowly.

Claims

1. Pneumatic diaphragm valve pulsator comprising a housing (10, 11) and a diaphragm (12) clamped therein, which engages at one side thereof an annular seat (15) between an inlet compartment (16) and an outlet compartment (18) for pressurized gas, said compartments being defined in the housing at said one side of the diaphragm while a back pressure compartment (20) is defined in the housing at the other side of the diaphragm, c h a r a c t e r i z e d by a continuously open choked connection (21; 33, 34) between the back pressure compartment (20) and the inlet compartment (16), and by a choked connection (22, 24, 25) open during operation of the pulsator, preferably via a shut-off valve (23), between the back pressure compartment (20) and the outlet compartment (18).
2. Pneumatic diaphragm valve pulsator according to claim 1, c h a r a c t e r i z e d in that the choked connection between the back pressure compartment (20) and the inlet compartment (16) comprises an aperture (21) in the diaphragm (12).
3. Pneumatic diaphragm valve pulsator according to claim 1, c h a r a c t e r i z e d in that the choked connection between the back pressure compartment (20) and the inlet compartment (16) comprises, a passage (33, 34) in the housing (10, 11).
4. Pneumatic diaphragm valve pulsator according to claim 3, c h a r a c t e r i z e d in that the passage (33, 34) is provided with an adjustable choke valve (35).
5. Pneumatic diaphragm valve pulsator according to any of claims 1 to 4, c h a r a c t e r i z e d in that the choked connection between the back pressure compartment (20) and the outlet compartment (18) comprises a passage (22, 24, 25) in the housing.
6. Pneumatic diaphragm valve pulsator according to claim 5, c h a r a c t e r i z e d in that the passage (22, 24, 25) between the back pressure compartment (20) and the outlet compartment (18) is provided with an adjustable choke valve (29).
7. Pneumatic diaphragm valve pulsator according to any of claims 1 to 6, c h a r a c t e r i z e d in that the shut-off valve comprises a solenoid valve (23).
8. Pneumatic diaphragm valve pulsator according to any of claims 1 to 7, c h a r a c t e r i z e d in that the inlet compartment (16) is arranged centrally inside the seat (15), the outlet compartment (18) being arranged annularly around the seat.
PCT/SE1980/000184 1979-07-03 1980-07-01 Pneumatic diaphragm valve pulsator WO1981000064A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61230/80A AU6123080A (en) 1979-07-03 1980-07-01 Pneumatic diaphragm valve pulsator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7905798A SE421871B (en) 1979-07-03 1979-07-03 PNEUMATIC MEMBRANE VALVE PULSOR
SE7905798 1979-07-03

Publications (1)

Publication Number Publication Date
WO1981000064A1 true WO1981000064A1 (en) 1981-01-22

Family

ID=20338433

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1980/000184 WO1981000064A1 (en) 1979-07-03 1980-07-01 Pneumatic diaphragm valve pulsator

Country Status (4)

Country Link
EP (1) EP0038329A1 (en)
JP (1) JPS56501038A (en)
SE (1) SE421871B (en)
WO (1) WO1981000064A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189386A2 (en) * 1985-01-16 1986-07-30 Kockum Sonics Aktiebolag Apparatus for generating in particular low-frequency sound
WO1988003995A1 (en) * 1986-11-28 1988-06-02 Svenska Rotor Maskiner Ab A method for producing pressure pulses in a mass of gas and a device for performing the method
FR2631537A1 (en) * 1988-05-20 1989-11-24 Instrumentarium Oy APPARATUS, APPLICATION THEREOF, AND METHOD FOR ADJUSTING THE PRESSURE OF A CUFF, SUCH AS A SPHYGMOMANOMETER CUFF
GR1003317B (en) * 1998-10-08 2000-02-09 Acoustic cleaner for solid deposits
CN109019890A (en) * 2018-08-02 2018-12-18 杨筠涵 Frequency modulation compressed gas self-excited pulse generator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0162049A1 (en) * 1983-01-28 1985-11-27 Krister Amnéus An arrangement in acoustic systems
JP5748540B2 (en) * 2011-04-15 2015-07-15 三菱日立パワーシステムズ株式会社 SOUND GENERATOR AND SOUND TYPE ADJUSTING AND SUPPRESSING DEVICE USING SAME, SOUND TYPE SOUT BLOWER DEVICE, HEAT EXCHANGE DEVICE, EXHAUST GAS TREATMENT DEVICE, INDUSTRIAL EQUIPMENT AND SOUND GENERATION DEVICE OPERATING METHOD

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE104959C1 (en) *
SE113006C1 (en) *
US1580481A (en) * 1921-11-01 1926-04-13 Arthur L P Gavin Flush valve
US3022039A (en) * 1958-12-22 1962-02-20 Gates Rubber Co Diaphragm for valve
US3379406A (en) * 1965-03-24 1968-04-23 Hays Mfg Co Diaphragm valve with water hammer preventer
DE2324580A1 (en) * 1973-05-16 1974-12-05 Beukert Elektro Christian MAGNETIC VALVE
SE340202C (en) * 1967-02-01 1975-07-17 Lucifer Sa
DE2438590A1 (en) * 1974-08-10 1976-02-26 Herion Werke Kg Servo-controlled fluid valve - has bypass with throttle and relief arrangement to eliminate valve closing surge
US4058287A (en) * 1975-09-19 1977-11-15 Automatic Switch Company Pilot-operated valve having constant closing rate
DE2627387A1 (en) * 1976-06-18 1977-12-29 Otto Albrecht Pneumatic impulse vibrator for granular materials - has adjustable frequency impulses transmitted from generating unit into material by distributing nozzle
US4099701A (en) * 1975-03-18 1978-07-11 Leopold Benjamin Berger Solenoid-controlled diaphragm valves

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE104959C1 (en) *
SE113006C1 (en) *
US1580481A (en) * 1921-11-01 1926-04-13 Arthur L P Gavin Flush valve
US3022039A (en) * 1958-12-22 1962-02-20 Gates Rubber Co Diaphragm for valve
US3379406A (en) * 1965-03-24 1968-04-23 Hays Mfg Co Diaphragm valve with water hammer preventer
SE340202C (en) * 1967-02-01 1975-07-17 Lucifer Sa
DE2324580A1 (en) * 1973-05-16 1974-12-05 Beukert Elektro Christian MAGNETIC VALVE
DE2438590A1 (en) * 1974-08-10 1976-02-26 Herion Werke Kg Servo-controlled fluid valve - has bypass with throttle and relief arrangement to eliminate valve closing surge
US4099701A (en) * 1975-03-18 1978-07-11 Leopold Benjamin Berger Solenoid-controlled diaphragm valves
US4058287A (en) * 1975-09-19 1977-11-15 Automatic Switch Company Pilot-operated valve having constant closing rate
DE2627387A1 (en) * 1976-06-18 1977-12-29 Otto Albrecht Pneumatic impulse vibrator for granular materials - has adjustable frequency impulses transmitted from generating unit into material by distributing nozzle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189386A2 (en) * 1985-01-16 1986-07-30 Kockum Sonics Aktiebolag Apparatus for generating in particular low-frequency sound
EP0189386A3 (en) * 1985-01-16 1987-11-19 Ulveco Kockum Sonics Ab Apparatus for generating in particular low-frequency sound
WO1988003995A1 (en) * 1986-11-28 1988-06-02 Svenska Rotor Maskiner Ab A method for producing pressure pulses in a mass of gas and a device for performing the method
US4923374A (en) * 1986-11-28 1990-05-08 Svenska Rotor Maskiner Ab Method for producing pressure pulses in a mass of gas and a device for performing the method
FR2631537A1 (en) * 1988-05-20 1989-11-24 Instrumentarium Oy APPARATUS, APPLICATION THEREOF, AND METHOD FOR ADJUSTING THE PRESSURE OF A CUFF, SUCH AS A SPHYGMOMANOMETER CUFF
GR1003317B (en) * 1998-10-08 2000-02-09 Acoustic cleaner for solid deposits
CN109019890A (en) * 2018-08-02 2018-12-18 杨筠涵 Frequency modulation compressed gas self-excited pulse generator

Also Published As

Publication number Publication date
SE7905798L (en) 1981-01-04
EP0038329A1 (en) 1981-10-28
JPS56501038A (en) 1981-07-30
SE421871B (en) 1982-02-08

Similar Documents

Publication Publication Date Title
US3756558A (en) Fluid control valve
US4301992A (en) Diaphragm valve
US4469079A (en) Exhaust gas recirculation (EGR) system
WO1981000064A1 (en) Pneumatic diaphragm valve pulsator
US4653523A (en) Pneumatic amplifier with negative feedback for current to pressure transducer
US2981280A (en) Pressure regulating valves
US4773443A (en) Pressure reducer
US1457937A (en) Pressure-regulating valve
US2704553A (en) de verteuil
US1984868A (en) Gas pressure stabilizer
US2593557A (en) Pilot controlled gas pressure regulator
US2861588A (en) Fluid pressure regulators
US2221942A (en) Pressure reducing feed valve
US3942468A (en) Back pressure operated sound transmitter
US1058102A (en) Gas-regulator.
ATE1206T1 (en) GAS PRESSURE REGULATOR.
JPS5965684A (en) Negative pressure regulator
US2921597A (en) Vacuum control apparatus
US2949238A (en) Projectors for water drinking fountains
JPS5933798B2 (en) gas pressure regulator
US1063065A (en) Pressure-regulator.
US1198595A (en) Pressure-reducing valve.
JPS57130118A (en) Control device for constant pressure of gas
JPH0138993B2 (en)
US1097086A (en) Gas and air burning burner.

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): AT AU CH DE DK GB JP NL NO US

Kind code of ref document: A1

Designated state(s): AT AU CH DE DK GB JP NL NO US

AL Designated countries for regional patents

Designated state(s): AT CH DE FR GB LU NL SE

Kind code of ref document: A1

Designated state(s): AT CH DE FR GB LU NL SE

WWE Wipo information: entry into national phase

Ref document number: 1980901336

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1980901336

Country of ref document: EP

WWR Wipo information: refused in national office

Ref document number: 1980901336

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1980901336

Country of ref document: EP