US614441A - Fluid-pressure regulator - Google Patents

Fluid-pressure regulator Download PDF

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Publication number
US614441A
US614441A US614441DA US614441A US 614441 A US614441 A US 614441A US 614441D A US614441D A US 614441DA US 614441 A US614441 A US 614441A
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Prior art keywords
waterway
fluid
pressure regulator
tube
regulator
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
    • G05D16/103—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger the sensing element placed between the inlet and outlet
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7793—With opening bias [e.g., pressure regulator]
    • Y10T137/7808—Apertured reactor surface surrounds flow line
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7834—Valve seat or external sleeve moves to open valve

Definitions

  • This invention relates to those devices which are fitted between street-mains and house branches for the purpose of automatically securing a constant and uniform pressure in said branches notwithstanding frequent and sudden changes in the delivery of water therefrom; and the principal feature of my improvements comprises a novel construction and arrangement of parts that enable a ready and accurate adjustment of a moving waterway that controls the actions of the regulator, as hereinafter more fully described.
  • Another feature of my invention consists in constructing the regulator in such a manner as to afford a perfectly-balanced Waterway, as hereinafter more fully described.
  • Figure l is a side elevation of my improved fluid-pressure regulator.
  • Fig. 2 is an axial section of the regulator, the moving Waterway being shifted away from its seat, so as to permit a free flow.
  • Fig. 3 is a transverse section of the device, taken at the line Y Y of the preceding illustration, the waterway being closed against its seat.
  • Fig. e is a transverse section taken at the line Z Z.
  • the principal member of the device is a barrel or shell A, having at one end a head B and at its other end a chamber C, of relatively greater diameter than said shell, the head being provided with a circular bore b to permit free play of the moving waterway D.
  • This waterway is an accurately-turned tube having near one endl an annular iiange E, against which latter a cupped packing-ring F isv travels, water-tight, within the chamber C as the tube D moves back and forth, said chamber being closed by a cap H, provided withan outlet connection h.
  • the waterway D is maintained in its normal or open position by a coiled sprin g I, that bears against the iiange E, and a tension-regulating nut J, the latter being provided with a circular bore K for the passage of said tube D. Furthermore, this nut has a number of radial openings j for the reception of a lever or pin for turning said nut either to the right or left, its periphery being properly threaded to engage with a female screw a, chased Within the shell A. a' ct are longitudinal slots in said shell to afford access to said nut.
  • a cap L Attached to the smaller end of shell A is a cap L, having an inlet connection l and a number of longitudinal ribs M, the inner surfaces of these ribs being screw-threaded and provided with shoulders m, annular channels l N being left between these ribs, as seen in Fig. 3, -and the united areas of said channels being equal to that of the waterway D.
  • Screwed into this cap until it bears against the shoulders m is a solid plug O, having on one side a seat P and on its other side a square shank 0 for the reception of a socket-Wrench.
  • R is a packing-ring clamped between' the head B b and cap L for the purpose of preventing any escape of water around the tube D.
  • the capstan-nut J is turned, either to the right or left, so as to advance or retract it within the shell A until the desired tension is imparted to the spring I, which tension will force the tube D away from the seat P and carry the piston F. F G of said tube toward the cap H, as seen in Fig. 2.
  • the inlet Z is then screwed to a pipe communicating with a street-main, While the outlet. h of the regulator is connected to a pipe attached to a house branch, the device being placed hori- Zontally or vertically or at. any suitable inclination, if desired.
  • the water When the water is let on, it flows through the inlet l, then traverses the annular channels N, and thus gains access to the tube D.
  • Fig. 3 it will be apparent that the tube D is surrounded on all sides by the water entering through the annular inlets N. Consequently said tube is perfectly balanced and is ready to move forward to an open position the instant the water-pressure is removed from the piston E F G and the spring I allowed to exercise its force.
  • the tube D has an uninterrupted passage through it from end to end, and not being provided with lateral ports or passages there is no danger of the packingring R being cut out by rubbing against the sides of such openings. Therefore the regulator will run for a long time without requiring repacking of this only Wearing part of the device.
  • a fluid-pressure regulator comprising a barrel having an enlarged chamber and outlet at one end, and provided at its other end with a detachable cap having a series of longitudinal channels communicatin g with a common inlet; a valve-seat arranged centrally between said channels; a reciprocating waterway housed within said barrel, and provided with a piston that traverses said enlarged chamber; and a coiled spring and adjusting-nut fitted around said waterway, in the manner described, and for the purpose stated.
  • a fluid-pressure regulator comprising a longitudinally-slotted and interiorly-threaded barrel having an outlet and enlargedV chamber at one end, and provided at its other end with a detachable cap having a series of longitudinal channels communicating with a common inlet; a detachable plug fitted eentrally between said channels, and furnished with a removable valveseat; a reciprocating waterway housed within said barrel, and provided with a piston that traverses said en; larged chamber; and a coiled spring and adjusting-nut surrounding said waterway, said nut being engaged with the interior thread of said barrel, all as herein described, and for the purpose stated.
  • a iiuid-pressure regulator comprising the barrel A, slotted longitudinally at a', interiorly threaded at a, and provided at one end with a chamber C, cap Il, and outlet h; and having at its other end a cap L having an inlet Z, and screw-threaded ribs M, with channels N, between them; a plug O engaged with said ribs, and provided with a seat I), a waterway D moving within said barrel and provided with a piston E F G, traversing said chamber C, a spring I coiled around said waterway, so as to force it away from said seat P, a capstan-nut J engaged with said thread a of the barrel, and a packing-ring R surrounding said waterway all as herein described.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Safety Valves (AREA)

Description

No. 6|4,44|. Patented Nov. 22,1898. A. E. BURNETT, 1n. FLUID PRESSURE REGULATOR.
(Appllcation filed May 4, 1898.)
(No Model.)
FIGLI.
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rrnn TATES ALFRED F.. BURNETT, JR., OF CINCINNATI, OHIO.
FLUID-PRESSURE REGULATOR.
SPECIFICATION forming part of Letters Patent No. 614,441, dated November 22, 1898.
Application filed May 4, 1898. Serial No. 679,660. (No model.)
T0 @ZZ whom it may concern.-
Be it known that I, ALFRED E. BURNETT, Jr., a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Fluid-Pressure Regulators; and I do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the annexed drawings, which form a part of this specification.
This invention relates to those devices which are fitted between street-mains and house branches for the purpose of automatically securing a constant and uniform pressure in said branches notwithstanding frequent and sudden changes in the delivery of water therefrom; and the principal feature of my improvements comprises a novel construction and arrangement of parts that enable a ready and accurate adjustment of a moving waterway that controls the actions of the regulator, as hereinafter more fully described.
Another feature of my invention consists in constructing the regulator in such a manner as to afford a perfectly-balanced Waterway, as hereinafter more fully described.
In the annexed drawings, Figure lis a side elevation of my improved fluid-pressure regulator. Fig. 2 is an axial section of the regulator, the moving Waterway being shifted away from its seat, so as to permit a free flow. Fig. 3 is a transverse section of the device, taken at the line Y Y of the preceding illustration, the waterway being closed against its seat. Fig. e is a transverse section taken at the line Z Z.
The principal member of the device is a barrel or shell A, having at one end a head B and at its other end a chamber C, of relatively greater diameter than said shell, the head being provided with a circular bore b to permit free play of the moving waterway D. This waterway is an accurately-turned tube having near one endl an annular iiange E, against which latter a cupped packing-ring F isv travels, water-tight, within the chamber C as the tube D moves back and forth, said chamber being closed by a cap H, provided withan outlet connection h.
The waterway D is maintained in its normal or open position by a coiled sprin g I, that bears against the iiange E, anda tension-regulating nut J, the latter being provided with a circular bore K for the passage of said tube D. Furthermore, this nut has a number of radial openings j for the reception of a lever or pin for turning said nut either to the right or left, its periphery being properly threaded to engage with a female screw a, chased Within the shell A. a' ct are longitudinal slots in said shell to afford access to said nut.
Attached to the smaller end of shell A is a cap L, having an inlet connection l and a number of longitudinal ribs M, the inner surfaces of these ribs being screw-threaded and provided with shoulders m, annular channels l N being left between these ribs, as seen in Fig. 3, -and the united areas of said channels being equal to that of the waterway D. Screwed into this cap until it bears against the shoulders m is a solid plug O, having on one side a seat P and on its other side a square shank 0 for the reception of a socket-Wrench.
R is a packing-ring clamped between' the head B b and cap L for the purpose of preventing any escape of water around the tube D.
After my regulator has been properly fitted together the capstan-nut J is turned, either to the right or left, so as to advance or retract it within the shell A until the desired tension is imparted to the spring I, which tension will force the tube D away from the seat P and carry the piston F. F G of said tube toward the cap H, as seen in Fig. 2. The inlet Z is then screwed to a pipe communicating with a street-main, While the outlet. h of the regulator is connected to a pipe attached to a house branch, the device being placed hori- Zontally or vertically or at. any suitable inclination, if desired. When the water is let on, it flows through the inlet l, then traverses the annular channels N, and thus gains access to the tube D. The water next escapes through the outlet h, enters the house branch, and flows regularly as long as a normal pressure is maintained; but when for any reason an abnormal pressure accumulates in the house branch the water bears against the capped side offpiston E F G, and as the area of the latter isconsiderably greater than that IOO of the tube D the result is to shift said tube until it seats against its bearing P, and thus automatically stops the flow of water for the time being; but as soon as the pressure in the house branch again becomes normal the spring I opens the waterway D and the flow of water is restored.
By referring to Fig. 3 it will be apparent that the tube D is surrounded on all sides by the water entering through the annular inlets N. Consequently said tube is perfectly balanced and is ready to move forward to an open position the instant the water-pressure is removed from the piston E F G and the spring I allowed to exercise its force. Again, it will be noticed that the tube D has an uninterrupted passage through it from end to end, and not being provided with lateral ports or passages there is no danger of the packingring R being cut out by rubbing against the sides of such openings. Therefore the regulator will run for a long time without requiring repacking of this only Wearing part of the device.
I claim as my invention- 1. A fluid-pressure regulator comprising a barrel having an enlarged chamber and outlet at one end, and provided at its other end with a detachable cap having a series of longitudinal channels communicatin g with a common inlet; a valve-seat arranged centrally between said channels; a reciprocating waterway housed within said barrel, and provided with a piston that traverses said enlarged chamber; and a coiled spring and adjusting-nut fitted around said waterway, in the manner described, and for the purpose stated.
2. A fluid-pressure regulator comprising a longitudinally-slotted and interiorly-threaded barrel having an outlet and enlargedV chamber at one end, and provided at its other end with a detachable cap having a series of longitudinal channels communicating with a common inlet; a detachable plug fitted eentrally between said channels, and furnished with a removable valveseat; a reciprocating waterway housed within said barrel, and provided with a piston that traverses said en; larged chamber; and a coiled spring and adjusting-nut surrounding said waterway, said nut being engaged with the interior thread of said barrel, all as herein described, and for the purpose stated.
3. A iiuid-pressure regulator comprising the barrel A, slotted longitudinally at a', interiorly threaded at a, and provided at one end with a chamber C, cap Il, and outlet h; and having at its other end a cap L having an inlet Z, and screw-threaded ribs M, with channels N, between them; a plug O engaged with said ribs, and provided with a seat I), a waterway D moving within said barrel and provided with a piston E F G, traversing said chamber C, a spring I coiled around said waterway, so as to force it away from said seat P, a capstan-nut J engaged with said thread a of the barrel, and a packing-ring R surrounding said waterway all as herein described.
In testimony whereot` I affix my signature in presence of two witnesses.
ALFRED E. BURNETT, JR.
IVitnesses:
JAMES H. LAYMAN, HARRY W. BRUKE.
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Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2590368A (en) * 1945-03-06 1952-03-25 Bendix Aviat Corp Valve
US2649661A (en) * 1946-08-03 1953-08-25 Kanpp Monarch Company Regulator valve
US2675649A (en) * 1954-04-20 Pressure reducing valve
US2726790A (en) * 1950-07-22 1955-12-13 Balcrank Inc Grease supply systems
US2755815A (en) * 1953-04-13 1956-07-24 Bendix Aviat Corp Flow-compensated pressure reducing valve
US2888949A (en) * 1957-04-25 1959-06-02 Robertshaw Fulton Controls Co Flow control device
US2996074A (en) * 1954-03-01 1961-08-15 John S Page Fluid pressure actuated shut-off valve
US3142311A (en) * 1962-02-02 1964-07-28 Gen Dynamics Corp Fluid flow control shut-off device
US3319829A (en) * 1966-02-24 1967-05-16 Barth Corp Encapsulated pressure regulator for liquid dispenser
US3435843A (en) * 1966-01-05 1969-04-01 Otis Eng Corp Valves
US3437109A (en) * 1967-05-26 1969-04-08 Donald W Carlson Air pressure regulator
US3698425A (en) * 1970-02-03 1972-10-17 U S Divers Co Adjustable breathing gas pressure regulator
US3848631A (en) * 1970-10-26 1974-11-19 Draft Systems Beer keg protective device
US3890999A (en) * 1972-12-15 1975-06-24 Eugene D Moskow Fluid pressure regulator
US3911988A (en) * 1974-02-21 1975-10-14 Eaton Corp Pressurization control device
US4924904A (en) * 1986-06-30 1990-05-15 Puritan-Bennett Corporation Adjustable pressure regulator device
US5411053A (en) * 1994-07-01 1995-05-02 Daniel A. Holt Fluid pressure regulator
US5540055A (en) * 1995-01-24 1996-07-30 Kee; Kum Suction and exhaust connection device
US5899221A (en) * 1995-06-30 1999-05-04 Holt; Daniel A. Fluid pressure regulator
US5979496A (en) * 1998-01-02 1999-11-09 Daniel A. Holt Adaptor for engaging a gas pressure source to a gas port
US6053192A (en) * 1998-10-30 2000-04-25 Ellzey; Steven J. Low operating force pressure regulator
US6056006A (en) * 1998-12-30 2000-05-02 Marshall Excelsior Company Piston pressure regulator
US6374853B1 (en) 2000-11-30 2002-04-23 Lindsay Manufacturing Company Combined pressure regulator and shut-off valve
US6752169B2 (en) 2002-10-31 2004-06-22 Lindsay Manufacturing Co. Pressure regulator and shut-off valve
US20040200531A1 (en) * 2003-04-10 2004-10-14 Zuck James C. Adjustable pressure regulator
US20040261859A1 (en) * 2002-10-31 2004-12-30 Callies Robert E. Pressure regulator and shut-off valve
US20050166226A1 (en) * 2002-04-23 2005-07-28 Thomson Licensing S.A. Parental control channel list tracking
US20060072781A1 (en) * 2004-09-28 2006-04-06 Harrington Steven J Encoding invisible electronic information in a printed document
US20060254652A1 (en) * 2005-05-16 2006-11-16 Gilbert Davidson Vacuum regulator and intermittent flow device
US20090071550A1 (en) * 2007-09-14 2009-03-19 Daryll Duane Patterson In-line adjustable regulators
DE102008060878A1 (en) * 2008-12-09 2010-06-10 Honeywell Technologies Sarl Valve insert for pressure regulating valve, has spring for pushing closing body into open position, and valve seat body movably arranged for adjusting back pressure in housing that is formed in one-piece
US20110175009A1 (en) * 2008-09-19 2011-07-21 Soeren Kristoffersen Fluid regulator
US20110297864A1 (en) * 2009-02-23 2011-12-08 Eidsmore Paul G In line flow control components and systems
US20120103310A1 (en) * 2009-03-12 2012-05-03 Kum Ki Apparatus for connecting intake and exhaust valves for internal combustion engine
US20150177738A1 (en) * 2009-02-17 2015-06-25 Carefusion 2200, Inc. Gas flow regulating device
US10550564B1 (en) 2016-09-07 2020-02-04 Jerry L. McKinney System for flushing a conduit
US11169550B2 (en) * 2019-10-30 2021-11-09 Pressure Specialist, Inc. Externally adjustable pressure regulator
US11209841B2 (en) * 2018-09-18 2021-12-28 Hyundai Motor Company Pressure regulator for fuel cell system
US20220147073A1 (en) * 2020-11-12 2022-05-12 Griswold Industries Pressure regulator
US11822354B1 (en) * 2022-06-01 2023-11-21 Husqvarna Ab Pressure reducer

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675649A (en) * 1954-04-20 Pressure reducing valve
US2590368A (en) * 1945-03-06 1952-03-25 Bendix Aviat Corp Valve
US2649661A (en) * 1946-08-03 1953-08-25 Kanpp Monarch Company Regulator valve
US2726790A (en) * 1950-07-22 1955-12-13 Balcrank Inc Grease supply systems
US2755815A (en) * 1953-04-13 1956-07-24 Bendix Aviat Corp Flow-compensated pressure reducing valve
US2996074A (en) * 1954-03-01 1961-08-15 John S Page Fluid pressure actuated shut-off valve
US2888949A (en) * 1957-04-25 1959-06-02 Robertshaw Fulton Controls Co Flow control device
US3142311A (en) * 1962-02-02 1964-07-28 Gen Dynamics Corp Fluid flow control shut-off device
US3435843A (en) * 1966-01-05 1969-04-01 Otis Eng Corp Valves
US3319829A (en) * 1966-02-24 1967-05-16 Barth Corp Encapsulated pressure regulator for liquid dispenser
US3437109A (en) * 1967-05-26 1969-04-08 Donald W Carlson Air pressure regulator
US3698425A (en) * 1970-02-03 1972-10-17 U S Divers Co Adjustable breathing gas pressure regulator
US3848631A (en) * 1970-10-26 1974-11-19 Draft Systems Beer keg protective device
US3890999A (en) * 1972-12-15 1975-06-24 Eugene D Moskow Fluid pressure regulator
US3911988A (en) * 1974-02-21 1975-10-14 Eaton Corp Pressurization control device
US4924904A (en) * 1986-06-30 1990-05-15 Puritan-Bennett Corporation Adjustable pressure regulator device
US5411053A (en) * 1994-07-01 1995-05-02 Daniel A. Holt Fluid pressure regulator
WO1996001445A1 (en) * 1994-07-01 1996-01-18 Holt Daniel A A fluid pressure regulator
US5540055A (en) * 1995-01-24 1996-07-30 Kee; Kum Suction and exhaust connection device
US5899221A (en) * 1995-06-30 1999-05-04 Holt; Daniel A. Fluid pressure regulator
US5979496A (en) * 1998-01-02 1999-11-09 Daniel A. Holt Adaptor for engaging a gas pressure source to a gas port
US6053192A (en) * 1998-10-30 2000-04-25 Ellzey; Steven J. Low operating force pressure regulator
US6056006A (en) * 1998-12-30 2000-05-02 Marshall Excelsior Company Piston pressure regulator
US6374853B1 (en) 2000-11-30 2002-04-23 Lindsay Manufacturing Company Combined pressure regulator and shut-off valve
US6758238B2 (en) 2000-11-30 2004-07-06 Lindsay Manufacturing Co. Combined pressure regulator and shut-off valve
US20050166226A1 (en) * 2002-04-23 2005-07-28 Thomson Licensing S.A. Parental control channel list tracking
US20040261859A1 (en) * 2002-10-31 2004-12-30 Callies Robert E. Pressure regulator and shut-off valve
US6923205B2 (en) 2002-10-31 2005-08-02 Lindsay Manufacturing Co. Pressure regulator and shut-off valve
US6752169B2 (en) 2002-10-31 2004-06-22 Lindsay Manufacturing Co. Pressure regulator and shut-off valve
US20040200531A1 (en) * 2003-04-10 2004-10-14 Zuck James C. Adjustable pressure regulator
US7051755B2 (en) * 2003-04-10 2006-05-30 Marshall Excelsior Company Adjustable pressure regulator
US20060072781A1 (en) * 2004-09-28 2006-04-06 Harrington Steven J Encoding invisible electronic information in a printed document
US20060254652A1 (en) * 2005-05-16 2006-11-16 Gilbert Davidson Vacuum regulator and intermittent flow device
US7255127B2 (en) * 2005-05-16 2007-08-14 Gilbert Davidson Vacuum regulator and intermittent flow device
CN101802741B (en) * 2007-09-14 2013-01-02 泰思康公司 In-line adjustable regulator
US20090071550A1 (en) * 2007-09-14 2009-03-19 Daryll Duane Patterson In-line adjustable regulators
WO2009038946A1 (en) * 2007-09-14 2009-03-26 Tescom Corporation In-line adjustable regulator
RU2479863C2 (en) * 2007-09-14 2013-04-20 Теском Корпорейшн Flow adjustable regulator
US20110175009A1 (en) * 2008-09-19 2011-07-21 Soeren Kristoffersen Fluid regulator
DE102008060878A1 (en) * 2008-12-09 2010-06-10 Honeywell Technologies Sarl Valve insert for pressure regulating valve, has spring for pushing closing body into open position, and valve seat body movably arranged for adjusting back pressure in housing that is formed in one-piece
US9690300B2 (en) * 2009-02-17 2017-06-27 Vyaire Medical Consumables Llc Gas flow regulating device
US20150177738A1 (en) * 2009-02-17 2015-06-25 Carefusion 2200, Inc. Gas flow regulating device
US20110297864A1 (en) * 2009-02-23 2011-12-08 Eidsmore Paul G In line flow control components and systems
US9605770B2 (en) * 2009-02-23 2017-03-28 Paul G. Eidsmore In line flow control components and systems
US20120103310A1 (en) * 2009-03-12 2012-05-03 Kum Ki Apparatus for connecting intake and exhaust valves for internal combustion engine
US10550564B1 (en) 2016-09-07 2020-02-04 Jerry L. McKinney System for flushing a conduit
US11209841B2 (en) * 2018-09-18 2021-12-28 Hyundai Motor Company Pressure regulator for fuel cell system
US11169550B2 (en) * 2019-10-30 2021-11-09 Pressure Specialist, Inc. Externally adjustable pressure regulator
US20220057817A1 (en) * 2019-10-30 2022-02-24 Jacob ENSIGN Externally adjustable pressure regulator
US11640181B2 (en) * 2019-10-30 2023-05-02 Pressure Specialist, Inc. Externally adjustable pressure regulator
US20220147073A1 (en) * 2020-11-12 2022-05-12 Griswold Industries Pressure regulator
US11703892B2 (en) * 2020-11-12 2023-07-18 Griswold Industries Pressure regulator
US11822354B1 (en) * 2022-06-01 2023-11-21 Husqvarna Ab Pressure reducer
US20230393595A1 (en) * 2022-06-01 2023-12-07 Husqvarna Ab Pressure reducer

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