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Filter-silencer for pneumatic devices

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US3783590A
US3783590A US3783590DA US3783590A US 3783590 A US3783590 A US 3783590A US 3783590D A US3783590D A US 3783590DA US 3783590 A US3783590 A US 3783590A
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Prior art keywords
filter
auxiliary
port
exhaust
valve
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A Allen
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A Allen
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086Filter condition indicators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42Auxiliary equipment or operation thereof
    • B01D46/4236Reducing noise or vibration emissions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00Check valves
    • F16K15/14Check valves with flexible valve members
    • F16K15/141Check valves with flexible valve members the closure elements not being fixed to the valve body
    • F16K15/142Check valves with flexible valve members the closure elements not being fixed to the valve body the closure elements being shaped as solids of revolution, e.g. toroidal or cylindrical rings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/20Exhaust after-treatment
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7859Single head, plural ports in parallel
    • Y10T137/7861Annular head
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7879Resilient material valve
    • Y10T137/7888With valve member flexing about securement
    • Y10T137/7889Sleeve

Abstract

A filter-silencer for pneumatic devices such as air valves, cylinders and the like of the type including a porous filter of a sintered metallic mass wherein, upon clogging of the filter and reduction of the air flow through the exhaust port for the corresponding air device, an auxiliary exhaust path is established which precludes the build-up of excessive back pressures in the pneumatic device and which also provides an audible warning signal indicating the need for servicing of the filter-silencer to restore the porous filter to its normal and intended functional state.

Description

United States Patent [191 Allen FILTER-SILENCER FOR PNEUMATIC DEVICES Alton K. Allen, 11 Flower Ln., Kings Point, N.Y. 11024 Filed: July 9, 1970 Appl. No.: 53,554

Inventor:

vs. C! 55/310, 5s/313, 181/37, 1 '210/90, 210/133 1m. (:1 ..-B0ld 46/42 References Cited UNlTED STATES PATENTS FOREIGN PATENTS OR APPLICATIONS 433,056 8/1926 Germany 55/313 Field of Search 55/274, 310, 312,

Turnbull 55/525 X Smallpeice 210/130 X 1 1 Jan. 8, 1974 Primary Examiner-Robert L. Lindsay, Jr. Attorney-Amster and Rothstein vice, an auxiliary exhaust path is established which precludes the build-up of excessive back pressures in the pneumatic device and which also provides an audible warning signal indicating the need for servicing of the filter-silencer to restore the porous filter to its normal and intended functional state.

6 Claims, 4 Drawing Figures PATENTED JAN 81974 INVENTOR. ALTON k. )4 L L EN Amm Mm HTTORNEXS The present invention relates to filter-silencers for pneumatic devices and, in particular, to an auxiliary porting system and warning device in such filtersilencers.

In a typical filter-silencer or muffler, there is provided a pipe nipple or fitting which is attached to the exhaust pipe or port of the associated pneumatic device, be it a valve, cylinderor the like, with the pipe, nipple or fitting carrying a nose-shaped filter head which typically may be a sintered metal mass, as of bronze and of the desired porosity, to provide for the controlled airflow therethrough. The exhaust air from the associated pneumatic device passes through the pipe nipple and is ported to atmosphere through the pores of the sintered mass of the filter. The filter muffles the sound of the exhaust flow, precludes small par ticles of matter from entering the atmosphere at high speeds and prevents foreign matter from entering the exhaust port of the associated pneumatic device.

Experience with filter-silencers of this type has demonstrated the need for a positive-system to deal with the clogging of the sintered filter head, which clogging occurs due to the presence of small particles in the normal air supply for the pneumatic device which tend to clog the pores of the filter-silencer. This reduces the flow of air through the exhaust port and correspondingly may affect the performance of the associated air device since the slowdown or restriction of the exhaust flow usually manifests itself as a functional change i the associated air device.

Broadly, 'it is an object of the present invention to provide an improved filter-silencer which obviates one or more of the aforesaid difficulties. Specifically, it is from entering the outlet port. Means are provided in the elongated body to create at least one auxiliary port which opens to atmosphere. A flapper valve is provided within the contemplation of the present invention to provide a filter-silencer wherein, upon clogging of the filter and the establishment of a corresponding predetermined back pressure at the exhaust, an auxiliary port is established to atmosphere to relieve the undesired back pressure and re-estab lish flow characteristics at the exhaust which are comparable to normal operation wherein the porous filter is substantially unclogged and is functioning in its intended manner.

It is a further object of the present invention to provide an improved filter-silencer wherein in response to the establishment of the auxiliary flowpath incident to the clogging of the filter, an audible warning signal is provided indicating that the filter-silencer is operating in its auxiliary mode and that'the filter is not functioning in its normal and intended manner.

It is a further object of the present invention to provide a filter-silencer which incorporates both the auxiliary flow capability and warning signal features in a construction which is eminently suited for mass production manufacture at relatively low unit cost and is easily serviced and maintained.

In accordance with an illustrative embodiment dem onstrating objects and features of the present invention, there is provided a filter-silencer which comprises an elongated body including a longitudinally-extending passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and also including an outlet port. A porous filter, typically of a sintered metal mass such as bronze, is connected to the outlet port and is constructed and arranged to pass the exhaust to atmosphere and to'preclude foreign matter on the body normally blocking the auxiliary port and operable when the back pressure in the passage exceeds a predetermined value as a result of the clogging of the filter for opening the auxiliary port to atmosphere to relieve the back pressure. The flapper valve is constructed and arranged to prevent foreign matter from entering into the bodyand includes a deformable flapper member of an elastomer seated on the body and selectively operable to open the auxiliary port to atmosphere. Advantageously, the flapper valve vibrates when the auxiliary port is brought into operation such as to emit a high audible pitch warning indicative of the blockage of the main flow and utilization of the auxiliary flow path.

The above brief description, as well as further objects, features and advantages of the present invention will be more fully appreciated by reference to the following detailed description of a presently preferred, but nonetheless illustrative embodiment in accordance with the present invention, wherein:

FIG. 1 is an elevational, view of a typical filtersilencer embodying features of the present invention;

FIG. ,2 is a sectional view. taken substantially along the lines 2-2 of FIG. 1 looking in the direction of the arrows and showing the filter-silencer in its normal mode of operation with the exhaust flow being through the sintered metal porous filter head;

FIG. 3' is a sectional view similar to FIG. 2 but showing the filter head blocked and illustrating the standby mode of operation wherein the air flow is through the auxiliary ports under control of the associated flapper valve; and

FIG. 4 is a sectional view taken substantially along the line 4-4 of FIG. 1 and looking in the direction of the arrows.

'ment of the filter-silencer to the exhaust port pipe or coupling of the associated pneumatic device.

At its opposite end, the elongated body 12 is formed or machined with a reduced diameter mounting flange 22 to which the filter head 24 is appropriately bonded. Filter head 24 is nose-shaped and is fabricated of a sintered metal mass having the requisite porosity and is manufactured in accordance with techniques which are generally understood. Typically, filter head 24 is of a sintered bronze providing a 40 micron filter and is commercially available under the trademark as Model No. The porous filter head 24 provides an enlarged exhaust chamber 26 contiguous to and in direct communication with the outlet port 18. To facilitate in the attachment of the filter-silencer to the exhaust port to be serviced, the body or nipple 12 is provided with an integral hexagonal nut 28, and once so attached, he filtersilencer 10 passes the exhaust air from the associated pneumatic device to the atomosphere with the appropriate muffling of the sound and prevention of small particles of matter in the exhaust flow from entering at corresponding audible warning signal indicating that the principal flow path is clogged and that the filtersilencer is operating in its standby or auxiliary mode. Device 30 includes a plurality of radially extending and circumferentially spaced exhaust ports 32 formed in the elongated body 10. Each of the auxiliary ports 32 communicates at its inner end with the through passage 14 and opens at its outer end through a circumferentially extending medial portion 34 of the body 12. This circumferentially extending medial portion 34 is formed with an annular valve seat 36 which is of a longitudinal extent greater than the corresponding dimension of the auxiliary ports 32. In this illustrative embodiment, seat 36 is of a longitudinal extent in excess of the diamter of the circular exhaust ports 32.

Device 30 further includes valve member 38 mounted on seat 36, which valve member is of the flap action type, is fabricated of elastomeric material (i.e., rubber) and is constructed and arranged to establish an auxiliary flow path at a preset back pressure, but to assure that there will be no flow through the auxiliary ports 32 during normal operation of the filter-silencer and, in the first instance to establish the flap action. Initially, the valve member 38 is sized in relation to the diameter of the supporting seat 36 to be placed in radial expansion when mounted thereon such that the end mounting section 38a is snugly and firmly supported on underlying mounting shoulder 36a of seat '36. The durometer of valve member 38 is selected such that exhaust ports 32 are effectively closed with virtually no leakage for the normal flow characteristics of the filter head 24 and for a limited build-up of back pressures as a result of the closing down or clogging of filter head 24 which is acceptable for the particular design. The durometer of the material employed for valve member 38, the deformation characteristics established by its cross section and related sizing of the exhaust ports 32 is selected such that when the back pressure builds to an unacceptable design value for the particular filtersilencer, the valve member 38 begins to vibrate and opens the auxiliary ports 32 to the atmosphere to establish the auxiliary flow path therethrough as indicated in FIG. 3. During such auxiliary flow, the high speed vibration of the valve member or ring 38 provides an audible high pitch warning signal indicative of the function of the filter-silencer in its auxiliary mode. The showing in FIG. 3 is on an enlarged scale and shows a transitional deformed position for ring 38 in one mode of vibration. Accordingly, it will be appreciated that the flap valve action precludes foreign matter from entering into the filter-silencer 10 through the exhaust ports 32 at which the exhaust flow is radial and outward, as indicated by the representative flow arrows. Desirably, the exhaust ports 32 are dimensioned and the valving action established suchthat the flow at the exhaust port when operating either in the principal mode (FIG. 2) or in the auxiliary or standby mode (FIG. 3) is substantially the same such that the operating characteristics of the associated air device are not adversely affected by the operation of the filter-silencer in the standby mode since operation in the standby mode may continue for some period of time, depending upon the location of the equipment and the availability of personnel to service the same.

It will be appreciated from the foregoing that there has been provided in accordance with this invention an exceptionally effective filter-silencer which is characterized by its simplicity in construction but is eminently suited to afford its normal function and a standby func-- tion accompanied by a warning signal. The device may be manufactured in accordance with well-accepted engineering practices and due to its simplicity in construction, may be made available at relatively low unit cost.

A latitude of modification, change and substitution is intended in the foregoing disclosure, and in some instances some features of the invention will be used without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the present invention.

What I claim is:

l. A filter-silencer comprising a body including a pas sage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere for said exhaust flow and valve means on said body normally closing said auxiliary port and operable when the back pressure therein exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said valve means being constructedand arranged to normally prevent foreign mattea from entering into said body through said auxiliary port during the operation thereof, said valve means also being constructed and arranged to return to its normal position in response to relief of said back pressure to reclose said auxiliary port, said body including at least one radial bore intermediate said exhaust inlet and said outlet port and communicating with said passage to provide said auxiliary port, said body being formed with a circumferentially extending annular seat through which said exhaust port opens to atmosphere and said valve means including a circumferentially extending annular valve member normally disposed in said seat and blocking said auxiliary port, said valve member being fabricated of an elastomeric material and deforming when said back pressure exceeds said predetermined value to periodically open and close said auxiliary port.

2. A filter-silencer according to claim 1 wherein said valve member circumferentially bears on said valve body at one side of said seat, a major portion of said valve member being free of support and confronting said exhaust port and providing a radially deformable flap section which vibrates in response to exhaust flow through said auxiliary port to provide an audible high pitch warning indicating the clogging of said filter.

3. A filter-silencer according to claim 2 wherein said filter is a porous sintered metallic mass and said valve member is rubber.

4. A filter-silencer comprising an elongated body including a longitudinally extending passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere and a flapper valve on said body normally blocking said auxiliary portand operable when the back pressure in said passage exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said flapper valve being constructed and arranged to normally prevent foreign matter from entering into said body during the operation thereof, said flapper valve also being constructed and arranged to return to its normal position in response to the relief of said back pressure to reclose said auxiliary port and including a deformable flapper member of an elastomer seated on said body and selectively operable to connect said auxiliary port to atmosphere, a plurality of radially extending auxiliary ports formed in said body, each of said auxiliary ports communicating at its inner end with said passage and opening at its outer end through a circumferentially extending portion being formed with an annular valve seat of a longitudinal extend greater than the corresponding dimension of said auxiliary ports and said flapper member being mounted in said seat straddling and normally blocking said auxiliary ports.

5. A filter-silencer according to claim 4 wherein said body includes a circumferentially extending mounting shoulder at one side of and within said seat, an end portion of said flapper member bearing against said mounting shoulder and the major part of said flapper member overlying said auxiliary ports and being free of support and vibrating in response to exhaust flow through said exhaust ports.

6. A filter-silencer according to claim 5 wherein said auxiliary ports are constructed and and arranged to provide a flow characteristic in said passage when in use which is comparable to. that for normal operation wherein said porous filter is substantially unclogged.

Claims (6)

1. A filter-silencer comprising a body including a passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere for said exhaust flow and valve means on said body normally closing said auxiliary port and operable when the back pressure therein exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said valve means being constructed and arranged to normally prevent foreign matter from entering into said body through said auxiliary port during the operation thereof, said valve means also being constructed and arranged to return to its normal position in response to relief of said back pressure to reclose said auxiliary port, said body including at least one radial bore intermediate said exhaust inlet and said outlet port and communicating with said passage to provide said auxiliary port, said body being formed with a circumferentially extending annular seat through which said exhaust port opens to atmosphere and said valve means including a circumferentially extending annular valve member normally disposed in said seat and blocking said auxiliary port, said valve member being fabricated of an elastomeric material and deforming when said back pressure exceeds said predetermined value to periodically open and close said auxiliary port.
2. A filter-silencer according to claim 1 wherein said valve member circumferentially bears on said valve body at one side of said seat, a major portion of said valve member being free of support and confronting said exhaust port and providing a radially deformable flap section which vibrates in response to exhaust flow through said auxiliary port to provide an audible high pitch warning indicating the clogging of said filter.
3. A filter-silencer according to claim 2 wherein said filter is a porous sintered metallic mass and said valve member is rubber.
4. A filter-silencer comprising an elongated body including a longitudinally extending passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere and a flapper valve on said body normally blocking said auxiliary port and operable when the back pressure in said passage exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said flapper valve being constructed and arranged to normally prevent foreign matter from entering into said body during the operation Thereof, said flapper valve also being constructed and arranged to return to its normal position in response to the relief of said back pressure to reclose said auxiliary port and including a deformable flapper member of an elastomer seated on said body and selectively operable to connect said auxiliary port to atmosphere, a plurality of radially extending auxiliary ports formed in said body, each of said auxiliary ports communicating at its inner end with said passage and opening at its outer end through a circumferentially extending portion being formed with an annular valve seat of a longitudinal extend greater than the corresponding dimension of said auxiliary ports and said flapper member being mounted in said seat straddling and normally blocking said auxiliary ports.
5. A filter-silencer according to claim 4 wherein said body includes a circumferentially extending mounting shoulder at one side of and within said seat, an end portion of said flapper member bearing against said mounting shoulder and the major part of said flapper member overlying said auxiliary ports and being free of support and vibrating in response to exhaust flow through said exhaust ports.
6. A filter-silencer according to claim 5 wherein said auxiliary ports are constructed and and arranged to provide a flow characteristic in said passage when in use which is comparable to that for normal operation wherein said porous filter is substantially unclogged.
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US3894611A (en) * 1974-02-22 1975-07-15 Jr Charles J Raudman Muffler
US3898063A (en) * 1973-02-23 1975-08-05 George A Gazan Combination muffler and filter device
US3949828A (en) * 1974-08-30 1976-04-13 Barry Wright Corporation Fluid exhaust silencer
US4026688A (en) * 1976-06-04 1977-05-31 The Raymond Lee Organization, Inc. Exhaust vent filter
US4036614A (en) * 1975-03-21 1977-07-19 Nfe International, Ltd. Pressure relief means for industrial vacuum
US4462158A (en) * 1981-08-07 1984-07-31 Andreas Stihl Hand-guided motor driven working device
US4484659A (en) * 1981-10-14 1984-11-27 Cycles Peugeot Device for modulating the flow of the gases in an internal combustion engine exhaust muffler
US4527659A (en) * 1984-02-13 1985-07-09 J. I. Case Company Thermally-responsive muffler drainhole valve mechanism
US4594159A (en) * 1983-11-17 1986-06-10 Pharmacia Ab Process and apparatus for applying back pressure in a liquid chromatography system
US5432307A (en) * 1992-11-21 1995-07-11 Karl M. Reich Maschinenfabrik Gmbh Noise damper for air pressure operated tools
US5482358A (en) * 1994-08-25 1996-01-09 Dual Dynamics Vented plug for a hubcap
US5664846A (en) * 1996-08-22 1997-09-09 Dual Dynamics, Inc. Hubcap with shielded vent
US5704957A (en) * 1994-12-24 1998-01-06 Gema Volstatic Ag Powder coating system
US5747753A (en) * 1993-07-15 1998-05-05 Motorenfabrik Hatz Gmbh & Co. Muffler for an internal combustion engine, particularly a single-cylinder diesel engine
US6024869A (en) * 1998-01-22 2000-02-15 Donaldson Company, Inc. Spin-on filter assembly with valve arrangements
US6126045A (en) * 1997-07-21 2000-10-03 Itsac N.V. Connector assembly for a fluid connection
US6189650B1 (en) * 1997-02-14 2001-02-20 Futaba Industrial Co., Ltd. Muffler structure
US20030070713A1 (en) * 2001-09-05 2003-04-17 Hydraulik-Ring Gmbh Check valve and valve arrangement comprising such a check valve
US6569217B1 (en) 2000-05-10 2003-05-27 Thomas M. DeMarco Industrial dust collector with multiple filter compartments
US20040124035A1 (en) * 2002-10-24 2004-07-01 Sageman Robert J. Flapper finger valve assembly
US20050051382A1 (en) * 2003-09-10 2005-03-10 Voss Automotive Gmbh: Pneumatic blow-off silencer
US20050191148A1 (en) * 2002-09-10 2005-09-01 Helmut Schlessmann Attachment pin for an exhaust-gas muffler
US20050223888A1 (en) * 2004-03-19 2005-10-13 Kriegsmann Michael K Pneumatic actuator for precision servo type applications
US20050229776A1 (en) * 2004-03-10 2005-10-20 Kriegsmann Michael K Pneumatic cylinder for precision servo type applications
US20050274094A1 (en) * 2003-03-17 2005-12-15 Demarco Thomas M Vacuum loader
DE102005013085B3 (en) * 2005-03-18 2006-06-01 Hydraulik-Ring Gmbh Hydraulic valve for automobile, has check valve with band formed of closed ring, which serves as opening-free band and is made of spring steel, where steel forms ring by overlap of section of bands at about one hundred and eighty degree
US20060207230A1 (en) * 2003-03-17 2006-09-21 Demarco Maxvac Corporation Vacuum loader with filter doors
EP1734260A2 (en) * 2005-06-17 2006-12-20 Dieter Sieber Silencer for pneumatic drive
US20080099277A1 (en) * 2006-10-30 2008-05-01 Basso Industry Corp. Muffler for pneumatic tools
US20080216830A1 (en) * 2007-03-06 2008-09-11 Smiths Medical Asd, Inc. Respiratory gas humidifier adapter with pressure relief valve and audible signal generator
US20090007770A1 (en) * 2004-03-10 2009-01-08 Sunstream Scientific Pneumatic cylinder for precision servo type applications
US20090286030A1 (en) * 2008-05-16 2009-11-19 Steris Inc. Instrument holder and connector
US20100282091A1 (en) * 2006-06-06 2010-11-11 Doleac Frederic Capsule with reduced dripping
US20100300388A1 (en) * 2009-05-27 2010-12-02 Hydraulik-Ring Gmbh Vane-type camshaft adjuster system
US20110094464A1 (en) * 2009-10-27 2011-04-28 Hydraulik-Ring Gmbh Vane-type motor cam phaser with a friction disc and mounting method
US20110114047A1 (en) * 2009-11-13 2011-05-19 Hydraulik-Ring Gmbh Camshaft insert
US20120060518A1 (en) * 2010-09-13 2012-03-15 Sumitomo Heavy Industries, Ltd. Cryopump and filter device
US8505582B2 (en) 2010-05-03 2013-08-13 Hilite Germany Gmbh Hydraulic valve
US8662040B2 (en) 2010-04-10 2014-03-04 Hilite Germany Gmbh Oscillating-motor camshaft adjuster having a hydraulic valve
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Cited By (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898063A (en) * 1973-02-23 1975-08-05 George A Gazan Combination muffler and filter device
US3894611A (en) * 1974-02-22 1975-07-15 Jr Charles J Raudman Muffler
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