US3661060A - Diaphragms for high pressure compressors and pumps - Google Patents

Diaphragms for high pressure compressors and pumps Download PDF

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US3661060A
US3661060A US61092A US3661060DA US3661060A US 3661060 A US3661060 A US 3661060A US 61092 A US61092 A US 61092A US 3661060D A US3661060D A US 3661060DA US 3661060 A US3661060 A US 3661060A
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diaphragm
combination
fluid
central plate
metal
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US61092A
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John C Bowen
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Flowserve Corp
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Duriron Co Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • F04B43/009—Special features systems, control, safety measures leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid

Definitions

  • This invention relates to diaphragms for high pressure compressors and pumps and more particularly to diaphragms which reduce heat transfer with respect to the fluid being compressed or pumped by the diaphragm while at the same time providing for diaphragm leak detection.
  • the diaphragm there shown comprises a central metal plate with a film or coating interposed between the diaphragm and the casing.
  • Avoidance of contamination of the fluid being pumped or compressed is also highly important for proper operation.
  • a diaphragm assembly for high pressure pumps and compressors which is free from fretting corrosion, which is suitable for greatly reducing heat transfer through the diaphragm assembly, and which provides for leak detection so that contamination of the working fluid can be avoided.
  • FIG. 1 is a fragmentary transverse sectional view of a portion of a high pressure pump or compressor incorporating the diaphragm assembly in accordance with the invention
  • FIG. 2 is an enlarged view of a portion of FIG. 1;
  • FIG. 3 is a fragmentary plan view on a smaller scale of an intermediate diaphragm element
  • FIG. 4 is a fragmentary plan view on a smaller scale of a different form of intermediate diaphragm element.
  • the diaphragm assembly 12 may be moved in any desired manner such as by liquid acting on the underside thereof and effective through the limit plate 14 as in my prior Pat. No. 3,318,250.
  • a suitable packing 15 such as metallic rings may be provided in grooves 16 in the upper and lower heads 10 and 11.
  • the plate 14 has a plurality of fluid delivery bores 17 therethrough communicating with a dished face 18 for engagement and limiting of the movement of the diaphragm assembly 12.
  • the upper head 10 has a fluid delivery bore 20 extending through the head 10 for delivery of fluid which has been compressed or pumped.
  • Inlet and delivery valves (not shown) of any suitable type can be employed, such as those shown in U.S. Pat. No. 3,425,429 ofBacino and Bowen.
  • the lower head 11 has an inlet bore 21 connected to a supply of fluid (not shown) for delivery of fluid to actuate the diaphragm assembly 12 and pump or compress fluid above the assembly 12.
  • the fluid used to actuate the diaphragm is generally a hydraulic fluid of mineral or spirit type and which can withstand a limited range of operating temperature variation.
  • the diaphragm assembly 12 has an upper diaphragm plate 25, a central plate 26 and a lower diaphragm plate 27.
  • the central plate 26 as viewed in FIG. 3 is circular and provided with a radial cut out or groove 30 to permit escape of any fluid which may leak through the upper plate 25 or the lower plate 27.
  • the plate 26a, in place of the groove 30, can have score lines 30a to permit of escape of fluid.
  • the diaphragm plates 26 and 26a can be fabricated of a heat insulating plastic or of metal in accordance with the demands of a particular installation.
  • the upper diaphragm plate 25, the central plate 26 and the lower diaphragm plate 27 may be coated with a heat insulating friction reducing and particle absorbent film 31.
  • the film 31 should be suitable for the process to be carried out, adherent to metal and not subject to removal by scuffing, resistant to flow when subjected to stress and motion, must allow limited sliding movement to occur between the diaphragm assembly 12 and the heads 10 and 11 and thereby reduce fretting corrosion, must be capable of absorbing small quantities of solid particles to prevent concentrated stresses from occurring and must have insulating characteristics.
  • a particularly suitable material for the film is available from E. I. du Pont de Nemours & Co., Wilmington, Del., under the name Teflon (Compound 958-203), this being a fluorocarbon resin with modifiers dispersed in an organic solvent for spray application.
  • Rulon R-75 a fluorocarbon resin with modifiers dispersed in an organic solvent for spray application available from Penn-Dixon Corporation, Clifton Heights, Pa.
  • Ekonol a polyester based on phydrobenzoic acid, available from Carborundum Corp., Niagara Falls, N.Y.
  • Emralon available from Acheson Colloids Corp. of Port Huron, Mich.
  • Vespel a polyimid available from E. I. du Pont de Nemours & Co., Wilmington, Del.
  • a thickness of film in the range from about 0.2 to 5 1,000ths of an inch has been found to be satisfactory, dependent on the strength of the film and on the bond. If the strength of the film is not great it will flow. If this happens the stresses in the diaphragm assembly may exceed the elastic limit and a thinner film must be employed to prevent failure.
  • the film 31 can be applied to both sides of the upper and lower diaphragm plates 25 and 27 and the central plate 26.
  • the heads 10 and 11 may also have the film 31 on the face 18 of the lower head and the face 32 of the upper head if desired.
  • the lower head 11 has a bore 35 therein which communicates with the opening between the upper and lower diaphragm plates 25 and 27 and extends to a threaded bore 36.
  • a pipe 37 is engaged with bore 36 and connected to a pressure sensitive gauge 38 which has a pipe 39 connected to its other side and to a pressure switch 40 of conventional well known type.
  • the switch 40 is connected to a circuit (not shown) which controls the hydraulic fluid pumped into the bore 21 for diaphragm actuation and may shut off the fluid flow should pressure from leaks be effective at switch 40.
  • a pressure relief valve 42 is connected to the switch 40 and a manually operated vent 43 is also connected to the switch 40.
  • said diaphragm assembly comprising a 'pluraiity of metal diaphragm plates

Abstract

Diaphragms are provided for high pressure compressors and pumps, the diaphragms having heat insulation properties, extended life and apparatus capable of detecting diaphragm leaks associated therewith.

Description

0 United States Patent 1151 3,661,060 Bowen 1. May 9, 1972 [54] DIAPHRAGMS FOR HIGH PRESSURE References Cited COMPRESSORS AND PUNIPS UNITED STATES PATENTS [7 Inventor: J n 0 n, -l n ng n V ll y, P 2,659,310 11/1953 Ryba ..92/98 x 2,736,332 2/1956 Simmons ....92/103 X [73] Assignee. The Duriron Company, Inc., Dayton, Ohio 3,249,022 5/1966 Edger hm "HQ/102 X [22] Filed: Aug. 5,1970 2,662,478 12/1953 Surre ..417/63 APPI- NO-I 61,092 Primary Examiner-Robert M. Walker Altorney-Zachary T. Wobensmith,.Jr.
[52] US. Cl ..92/102,92/103 M, 417/63 B T CT [511 1m.cl ..F0lb 19/00, Fl6j 3/00, F04b 21/00 [57] A S RA 1581 Field of Search ..417 63, 395; 92/102, 103, 103 M, Diaphragms are Provided for high Pressure Compressors and 92/103 SD, 103 R, 98
pumps, the diaphragms having heat insulation properties, extended life and apparatus capable of detecting diaphragm leaks associated therewith.
8 Claims, 4 Drawing Figures /2 /f m /5 I 1 BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to diaphragms for high pressure compressors and pumps and more particularly to diaphragms which reduce heat transfer with respect to the fluid being compressed or pumped by the diaphragm while at the same time providing for diaphragm leak detection.
2. Description of the Prior Art It has heretofore been proposed to provide laminated diaphragms for low pressure service. Examples of such diaphragms are shown by McFarland, U.S. Pat. No. 2,918,089 and Lang, U.S. Pat. No. 3,049,931. These and similar diaphragms are not suitable for high operating pressures of the order of 5,000 psi and higher.
Serious difficulties have been encountered in high pressure service because of the fretting corrosion which occurs. In my application for patent filed June 3, 1970, Ser. No. 42,957 provisions are made for avoiding fretting corrosion and greatly increasing the life of a diaphragm.
The diaphragm there shown comprises a central metal plate with a film or coating interposed between the diaphragm and the casing.
Serious difficulties have heretofore been encountered, also with high pressure service, if the temperature of the fluid being compressed or pumped was at a temperature either too high or too low to be compatible with the fluid utilized for actuating the diaphragm.
Avoidance of contamination of the fluid being pumped or compressed is also highly important for proper operation.
SUMMARY OF THE INVENTION In accordance with the invention a diaphragm assembly is provided for high pressure pumps and compressors which is free from fretting corrosion, which is suitable for greatly reducing heat transfer through the diaphragm assembly, and which provides for leak detection so that contamination of the working fluid can be avoided.
It is the principal object of the present invention to provide an improved diaphragm assembly for high pressure pumps and compressors which will obviate serious problems which have arisen with diaphragms heretofore employed and with particular respect to fretting corrosion, heat transfer and contamination ofthe fluid being pumped or compressed.
It is a further object of the present invention to provide a diaphragm assembly of the character aforesaid which will have a long life and which will be reliable in service.
Other objects and advantageous features of the invention will be apparent from the description and claims.
BRIEF DESCRIPTION OF THE DRAWINGS The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:
FIG. 1 is a fragmentary transverse sectional view of a portion of a high pressure pump or compressor incorporating the diaphragm assembly in accordance with the invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a fragmentary plan view on a smaller scale of an intermediate diaphragm element; and
FIG. 4 is a fragmentary plan view on a smaller scale of a different form of intermediate diaphragm element.
It should, of course, be understood that the description and drawings herein are illustrative merely and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now more particularly to the drawings, a portion of a high pressure pump or compressor similar to that in my prior U.S. Pat. No. 3,318,250, is shown and includes an upper diaphragm mounting head 10, a lower diaphragm mounting head 11 and a diaphragm assembly 12 with an interposed limit plate 14.
The diaphragm assembly 12 may be moved in any desired manner such as by liquid acting on the underside thereof and effective through the limit plate 14 as in my prior Pat. No. 3,318,250.
A suitable packing 15 such as metallic rings may be provided in grooves 16 in the upper and lower heads 10 and 11.
The plate 14 has a plurality of fluid delivery bores 17 therethrough communicating with a dished face 18 for engagement and limiting of the movement of the diaphragm assembly 12. The upper head 10 has a fluid delivery bore 20 extending through the head 10 for delivery of fluid which has been compressed or pumped. Inlet and delivery valves (not shown) of any suitable type can be employed, such as those shown in U.S. Pat. No. 3,425,429 ofBacino and Bowen.
The lower head 11 has an inlet bore 21 connected to a supply of fluid (not shown) for delivery of fluid to actuate the diaphragm assembly 12 and pump or compress fluid above the assembly 12. The fluid used to actuate the diaphragm is generally a hydraulic fluid of mineral or spirit type and which can withstand a limited range of operating temperature variation.
The diaphragm assembly 12 has an upper diaphragm plate 25, a central plate 26 and a lower diaphragm plate 27.
The central plate 26 as viewed in FIG. 3 is circular and provided with a radial cut out or groove 30 to permit escape of any fluid which may leak through the upper plate 25 or the lower plate 27. As seen in FIG. 4, the plate 26a, in place of the groove 30, can have score lines 30a to permit of escape of fluid. The diaphragm plates 26 and 26a can be fabricated of a heat insulating plastic or of metal in accordance with the demands of a particular installation.
The upper diaphragm plate 25, the central plate 26 and the lower diaphragm plate 27 may be coated with a heat insulating friction reducing and particle absorbent film 31. The film 31 should be suitable for the process to be carried out, adherent to metal and not subject to removal by scuffing, resistant to flow when subjected to stress and motion, must allow limited sliding movement to occur between the diaphragm assembly 12 and the heads 10 and 11 and thereby reduce fretting corrosion, must be capable of absorbing small quantities of solid particles to prevent concentrated stresses from occurring and must have insulating characteristics.
A particularly suitable material for the film is available from E. I. du Pont de Nemours & Co., Wilmington, Del., under the name Teflon (Compound 958-203), this being a fluorocarbon resin with modifiers dispersed in an organic solvent for spray application.
Other suitable materials for the film are Rulon R-75, a fluorocarbon resin with modifiers dispersed in an organic solvent for spray application available from Penn-Dixon Corporation, Clifton Heights, Pa.; Ekonol, a polyester based on phydrobenzoic acid, available from Carborundum Corp., Niagara Falls, N.Y.; Emralon, available from Acheson Colloids Corp. of Port Huron, Mich.; and Vespel, a polyimid available from E. I. du Pont de Nemours & Co., Wilmington, Del.
A thickness of film in the range from about 0.2 to 5 1,000ths of an inch has been found to be satisfactory, dependent on the strength of the film and on the bond. If the strength of the film is not great it will flow. If this happens the stresses in the diaphragm assembly may exceed the elastic limit and a thinner film must be employed to prevent failure.
The film 31 can be applied to both sides of the upper and lower diaphragm plates 25 and 27 and the central plate 26. The heads 10 and 11 may also have the film 31 on the face 18 of the lower head and the face 32 of the upper head if desired.
The lower head 11 has a bore 35 therein which communicates with the opening between the upper and lower diaphragm plates 25 and 27 and extends to a threaded bore 36.
A pipe 37 is engaged with bore 36 and connected to a pressure sensitive gauge 38 which has a pipe 39 connected to its other side and to a pressure switch 40 of conventional well known type. The switch 40 is connected to a circuit (not shown) which controls the hydraulic fluid pumped into the bore 21 for diaphragm actuation and may shut off the fluid flow should pressure from leaks be effective at switch 40. A pressure relief valve 42 is connected to the switch 40 and a manually operated vent 43 is also connected to the switch 40. With the protective film as described coating the various parts of the diaphragm assembly 12 and the heads and 11, high or low temperatures of the fluid to be compressed or pumped which might be beyond the proper operating limits of the pumping fluid will not be adversely effective on the pumping fluid because of the temperature insulating and isolating qualities of the diaphragm assembly attendant on the use of the plurality of films 31 with or without enhancement by a central plate 26 of low heat conductivity.
In addition should the upper diaphragm plate 25 or the lower plate 26 rupture or fail the leaking fluid will flow out through groove 30 in plate 26 or score line 30a in plate 260 through bore 35, pipe 37 to pressure gauge 38 and through pipe 39 to pressure switch 40 so that the pressure rise will be apparent on gauge 38, and pressure switch 40 will cut off the flow of pumping fluid which actuates the diaphragm assembly 12 so that contamination of the fluid being pumped and damage will not be inflicted on the diaphragm assembly.
It will thus be seen that apparatus has been provided with which the objects of the invention are attained.
I claim: 1. In combination with metal mounting heads having a diaphragm chamber therebetween,
a diaphragm assembly carried by said heads in said chamber,
said diaphragm assembly comprising a 'pluraiity of metal diaphragm plates, and
a plurality of spaced heat insulating and fretting corrosion deterring films interposed between said metal diaphragm plates and said mounting heads at the periphery of said plates.
2. The combination as defined in claim 1 in which a central plate of reduced diameter is interposed between a pair of said metal diaphragm plates.
3. The combination as defined in claim 2 in which said central plate is circular and is provided with at least one fluid delivery passageway communicating with the periphery of said central plate.
4. The combination as defined in claim 3 in which said fluid delivery passage is a radial slot.
5. The combination as defined in claim 3 in which said fluid delivery passage is a radial groove.
6. The combination as defined in claim 3 in which said central plate is of synthetic plastic.
7. The combination as defined in claim 3 in which said central plate is of metal.
8. The combination as defined in claim 3 in which means are associated with said diaphragm assembly for detecting fluid leakage through said passageway.

Claims (8)

1. In combination with metal mounting heads having a diaphragm chamber therebetween, a diaphragm assembly carried by said heads in said chamber, said diaphragm assembly comprising a plurality of metal diaphragm plates, and a plurality of spaced heat insulating and fretting corrosion deterring films interposed between said metal diaphragm plates and said mounting heads at the periphery of said plates.
2. The combination as defined in claim 1 in which a central plate of reduced diameter is interposed between a pair of said metal diaphragm plates.
3. The combination as defined in claim 2 in which said central plate is circular and is provided with at least one fluid delivery passageway communicating with the periphery of said central plate.
4. The combination as defined in claim 3 in which said fluid delivery passage is a radial slot.
5. The combination as defined in claim 3 in which said fluid delivery passage is a radial groove.
6. The combination as defined in claim 3 in which said central plate is of synthetic plastic.
7. The combination as defined in claim 3 in which said central plate is of metal.
8. The combination as defined in claim 3 in which means are associated with said diaphragm assembly for detecting fluid leakage through said passageway.
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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028461A (en) * 1975-09-05 1977-06-07 Robertshaw Controls Company Method of making a plurality of substantially identical flexible diaphragms
FR2340470A1 (en) * 1976-02-07 1977-09-02 Polysius Ag HYDROSTATIC SUPPORT AND HYDROSTATIC LEVEL CONSTITUTED BY SEVERAL SUPPORTS
US4413647A (en) * 1972-11-27 1983-11-08 Lorenzo Bruce L De Leak detection arrangement for valve having sealing means
US4679429A (en) * 1985-01-29 1987-07-14 Gewerkschaft Eisenhutte Westfalia Hydraulic ram stroke monitoring apparatus
EP0258541A2 (en) * 1986-08-28 1988-03-09 Nippon Pillar Packing Co. Ltd. Pneumatic pumping device
US4740139A (en) * 1984-09-27 1988-04-26 Myron Mantell Failure sensing device for a diaphragm pump
US4776368A (en) * 1987-03-13 1988-10-11 Binks Manufacturing Company Fluid pressure regulator
US4787825A (en) * 1984-09-27 1988-11-29 Myron Mantell Failure sensing device for a diaphragm pump
DE3714153A1 (en) * 1987-04-28 1988-12-01 Sergej Michajlovic Altuchov Diaphragm machine unit
US4797070A (en) * 1983-05-18 1989-01-10 Oskar Schatz Displacement compressor for supercharging of combustion engines
DK154984B (en) * 1977-05-20 1989-01-16 Alfa Laval Ab CONTROL VALVE INCLUDING A MEMBRANEWALL AND A CENTRAL IN THE MEMBRANEWALL LOCATED VALVE BODY
DE3729726A1 (en) * 1987-09-04 1989-03-23 Sergej Michajlovic Altuchov Membrane machine unit
US4838763A (en) * 1986-11-20 1989-06-13 Heyko Reinecker Canned motor pump
US4840195A (en) * 1987-11-19 1989-06-20 Air Products And Chemicals, Inc. Piston-backed gas pressure regulator
US4854823A (en) * 1987-02-14 1989-08-08 Paul Hatting Leak indicating device for centrifugal pump
US4881876A (en) * 1987-12-17 1989-11-21 Dosapro Milton Roy Device for detecting that a membrane in a membrane pump has broken
US4890988A (en) * 1986-11-20 1990-01-02 Heyko Reinecker Canned motor pump
US4915017A (en) * 1987-10-26 1990-04-10 D. F. Laboratories Ltd. Diaphragm and a diaphragm-actuated fluid-transfer control device
US4934902A (en) * 1984-09-27 1990-06-19 Myron Mantell Failure sensing device for a diaphragm pump
US4971523A (en) * 1988-09-13 1990-11-20 Nordson Corporation Dual diaphragm apparatus with diaphragm assembly and rupture detection methods
US4998863A (en) * 1987-04-11 1991-03-12 Franz Klaus Union Armaturen Pumpen Gmbh & Co. Magnetic pump drive
DE4027027A1 (en) * 1990-08-27 1992-03-05 Prominent Dosiertechnik Gmbh Leak detector for diaphragm pump - uses laminate diaphragm with evacuated internal space connected to part with contacts which close if pressure arises because of leak
DE4205122C2 (en) * 1992-02-20 2000-07-13 Uraca Pumpen Plunger or piston pump
US6227824B1 (en) * 1995-09-15 2001-05-08 HAN-SCHICKARD-GESELLSCHAFT FüR ANGEWANDTE FORSCHUNG E.V. Fluid pump without non-return valves
US20040086397A1 (en) * 2002-11-06 2004-05-06 Bowen John C. Fluid cooled diaphragms for diaphragm compressors
US20040083883A1 (en) * 2002-07-24 2004-05-06 Alexander Bubb Safety diaphragm for a diaphragm pump
US20040168435A1 (en) * 2000-12-20 2004-09-02 Kazuhiro Ichimura Device for detecting failure of hydraulic motor, and hydraulic vehicle
US20060251533A1 (en) * 2004-01-21 2006-11-09 Nighy Richard J Fluid metering with a disposable membrane type pump unit
US7180720B2 (en) 2001-01-19 2007-02-20 Hitachi Construction Machinery Co., Ltd. Failure detection device for hydraulic motor and hydraulic drive vehicle
CN100360800C (en) * 2005-11-02 2008-01-09 杭州大潮泵业制造有限公司 Hydraulic diaphragm type metering pump with preposed diaphragm protection plate structure
US20080089794A1 (en) * 2004-11-01 2008-04-17 Octec Inc. Pump for Supplying Chemical Liquids
US20120098215A1 (en) * 2010-10-22 2012-04-26 Oshkosh Corporation Pump for vehicle suspension system
US20130108192A1 (en) * 2011-10-28 2013-05-02 Jtekt Corporation Variable flow-rate hydrostatic bearing
CN103352839A (en) * 2013-07-26 2013-10-16 胜瑞兰工业设备（苏州）有限公司 Membrane leakage guiding device with metal sheets with slots
CN103362793A (en) * 2013-07-26 2013-10-23 胜瑞兰工业设备（苏州）有限公司 Woven wire mesh membrane leakage guide device
US20150030466A1 (en) * 2011-08-22 2015-01-29 Cummins Emission Solutions, Inc. Urea Solution Pumps Having Leakage Bypass
US20160169218A1 (en) * 2014-11-14 2016-06-16 Checkpoint Fluidic Systems International, Ltd. Metallic Sandwich Diaphragm Pump Mechanism
US9688112B2 (en) 2010-08-31 2017-06-27 Oshkosh Defense, Llc Gas spring assembly for a vehicle suspension system
US10221055B2 (en) 2016-04-08 2019-03-05 Oshkosh Corporation Leveling system for lift device
US10578098B2 (en) 2005-07-13 2020-03-03 Baxter International Inc. Medical fluid delivery device actuated via motive fluid
WO2022002326A1 (en) * 2020-06-30 2022-01-06 Nel Hydrogen A/S Leak detection from diaphragm compressor
US11478578B2 (en) 2012-06-08 2022-10-25 Fresenius Medical Care Holdings, Inc. Medical fluid cassettes and related systems and methods
DE102021125266A1 (en) 2021-09-29 2023-03-30 Prominent Gmbh Diaphragm metering pump with protective diaphragm

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US2659310A (en) * 1950-09-02 1953-11-17 Ryba Anton Electromagnetic pumping device for pumping fluids
US3249022A (en) * 1964-04-22 1966-05-03 Jr John G Bolger Pressure-responsive device

Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413647A (en) * 1972-11-27 1983-11-08 Lorenzo Bruce L De Leak detection arrangement for valve having sealing means
US4028461A (en) * 1975-09-05 1977-06-07 Robertshaw Controls Company Method of making a plurality of substantially identical flexible diaphragms
FR2340470A1 (en) * 1976-02-07 1977-09-02 Polysius Ag HYDROSTATIC SUPPORT AND HYDROSTATIC LEVEL CONSTITUTED BY SEVERAL SUPPORTS
US4099802A (en) * 1976-02-07 1978-07-11 Polysius Ag Hydrostatic bearing unit and a hydrostatic bearing assembly comprising several such bearing units
DK154984B (en) * 1977-05-20 1989-01-16 Alfa Laval Ab CONTROL VALVE INCLUDING A MEMBRANEWALL AND A CENTRAL IN THE MEMBRANEWALL LOCATED VALVE BODY
US4797070A (en) * 1983-05-18 1989-01-10 Oskar Schatz Displacement compressor for supercharging of combustion engines
US4934902A (en) * 1984-09-27 1990-06-19 Myron Mantell Failure sensing device for a diaphragm pump
US4740139A (en) * 1984-09-27 1988-04-26 Myron Mantell Failure sensing device for a diaphragm pump
US4787825A (en) * 1984-09-27 1988-11-29 Myron Mantell Failure sensing device for a diaphragm pump
US4679429A (en) * 1985-01-29 1987-07-14 Gewerkschaft Eisenhutte Westfalia Hydraulic ram stroke monitoring apparatus
EP0258541A2 (en) * 1986-08-28 1988-03-09 Nippon Pillar Packing Co. Ltd. Pneumatic pumping device
EP0258541A3 (en) * 1986-08-28 1989-12-06 Nippon Pillar Packing Co. Ltd. Pneumatic pumping device
US4838763A (en) * 1986-11-20 1989-06-13 Heyko Reinecker Canned motor pump
US4890988A (en) * 1986-11-20 1990-01-02 Heyko Reinecker Canned motor pump
US4854823A (en) * 1987-02-14 1989-08-08 Paul Hatting Leak indicating device for centrifugal pump
US4776368A (en) * 1987-03-13 1988-10-11 Binks Manufacturing Company Fluid pressure regulator
US4998863A (en) * 1987-04-11 1991-03-12 Franz Klaus Union Armaturen Pumpen Gmbh & Co. Magnetic pump drive
DE3714153A1 (en) * 1987-04-28 1988-12-01 Sergej Michajlovic Altuchov Diaphragm machine unit
DE3729726A1 (en) * 1987-09-04 1989-03-23 Sergej Michajlovic Altuchov Membrane machine unit
US4915017A (en) * 1987-10-26 1990-04-10 D. F. Laboratories Ltd. Diaphragm and a diaphragm-actuated fluid-transfer control device
US4840195A (en) * 1987-11-19 1989-06-20 Air Products And Chemicals, Inc. Piston-backed gas pressure regulator
US4881876A (en) * 1987-12-17 1989-11-21 Dosapro Milton Roy Device for detecting that a membrane in a membrane pump has broken
US4971523A (en) * 1988-09-13 1990-11-20 Nordson Corporation Dual diaphragm apparatus with diaphragm assembly and rupture detection methods
DE4027027A1 (en) * 1990-08-27 1992-03-05 Prominent Dosiertechnik Gmbh Leak detector for diaphragm pump - uses laminate diaphragm with evacuated internal space connected to part with contacts which close if pressure arises because of leak
DE4205122C2 (en) * 1992-02-20 2000-07-13 Uraca Pumpen Plunger or piston pump
US6227824B1 (en) * 1995-09-15 2001-05-08 HAN-SCHICKARD-GESELLSCHAFT FüR ANGEWANDTE FORSCHUNG E.V. Fluid pump without non-return valves
US7082756B2 (en) * 2000-12-20 2006-08-01 Hitachi Construction Machinery Co., Ltd. Device for detecting failure of hydraulic motor, and hydraulic vehicle
US20040168435A1 (en) * 2000-12-20 2004-09-02 Kazuhiro Ichimura Device for detecting failure of hydraulic motor, and hydraulic vehicle
US7180720B2 (en) 2001-01-19 2007-02-20 Hitachi Construction Machinery Co., Ltd. Failure detection device for hydraulic motor and hydraulic drive vehicle
US6907816B2 (en) * 2002-07-24 2005-06-21 Prominent Dosiertechnik Gmbh Safety diaphragm for a diaphragm pump
US20040083883A1 (en) * 2002-07-24 2004-05-06 Alexander Bubb Safety diaphragm for a diaphragm pump
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