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US20170335972A1 - Rod packing - Google Patents

Rod packing Download PDF

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Publication number
US20170335972A1
US20170335972A1 US15/592,391 US201715592391A US2017335972A1 US 20170335972 A1 US20170335972 A1 US 20170335972A1 US 201715592391 A US201715592391 A US 201715592391A US 2017335972 A1 US2017335972 A1 US 2017335972A1
Authority
US
United States
Prior art keywords
ring
segments
inner diameter
packing ring
packing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/592,391
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English (en)
Inventor
Pascal Mahieux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compressor Products International LLC
Original Assignee
Compressor Products International LLC
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 Compressor Products International LLC filed Critical Compressor Products International LLC
Priority to US15/592,391 priority Critical patent/US20170335972A1/en
Assigned to COMPRESSOR PRODUCTS INTERNATIONAL, LLC reassignment COMPRESSOR PRODUCTS INTERNATIONAL, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAHIEUX, PASCAL
Publication of US20170335972A1 publication Critical patent/US20170335972A1/en
Assigned to BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT reassignment BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Assignors: COMPRESSOR PRODUCTS INTERNATIONAL LLC
Priority to US17/463,334 priority patent/US11719344B2/en
Assigned to COMPRESSOR PRODUCTS INTERNATIONAL, LLC reassignment COMPRESSOR PRODUCTS INTERNATIONAL, LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/441—Free-space packings with floating ring
    • F16J15/442—Free-space packings with floating ring segmented
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • F04B39/042—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod sealing being provided on the piston
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • F04B39/045—Labyrinth-sealing between piston and cylinder
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/02—Packing the free space between cylinders and pistons
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/144—Adaptation of piston-rods
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections

Definitions

  • Compressors and other reciprocating pumps generally have a piston rod that moves into and out of a high (or low) pressure system.
  • the pathway that the piston rod follows provides a natural leak path for the fluid (gas or liquid) into or out of the cylinder.
  • Rod packing has been designed to at least inhibit the leakage.
  • Rod packing has changed and improved over the years.
  • One significant improvement in packing was a tangential joint packing ring 100 as shown in FIG. 1A .
  • the tangential joint packing ring 100 is typically segmented. This example shows the tangential joint packing ring 100 to be in three (3) identical pieces 102 1-3 .
  • the interfaces 104 or cuts lie on the side of a triangle.
  • the original inner diameter D 0 of the tangential joint packing ring 100 is designed to operationally mate with the outer diameter of the corresponding piston rod (not specifically shown in FIG. 1A ).
  • the internal surface 106 of the tangential joint packing ring 100 is generally not contiguous, but each segment has a gap 108 .
  • An elastic member 110 extends around the outer diameter 112 of the tangential joint packing ring 100 .
  • the elastic member 110 is contained in a groove 200 on the outer surface 114 (see FIG. 2 ).
  • the elastic member 110 provides a compressive force.
  • the elastic member 110 squeezes the tangential joint packing ring 100 causing the pieces 102 to slide with respect to each other, which reduces the gap's radial width.
  • the wear causes the pieces 102 to slide until the gap 108 closes and the pieces 102 abut as shown in FIG. 1B , at which time the packing (and possibly the piston rod) needs to be replaced.
  • the final inner diameter ID is operationally designed to mate with the outer diameter of the piston rod (regardless of whether the piston rod has suffered wear).
  • a second ring 202 is provided, as shown in FIG. 2 , such that the tangentially cut packing ring 100 and the second ring 202 form a packing ring set 210 .
  • the second ring 202 would be segmented into identical pieces.
  • an elastic member 204 would reside in a groove 206 on an outer surface 208 of the second ring.
  • the interfaces on the second ring 202 (which are radial cuts but otherwise similar to the ones described above and not shown here) would not overlap with the interfaces 104 and gaps 108 of the tangentially cut packing ring 100 . This arrangement seals the leak paths formed by the cuts and gaps.
  • a tangentially cut rod packing ring comprises a first ring formed from a plurality of segments. Each of the segments has a portion of two interfaces where each interface slidably engages an interface of an adjacent segment. One interface terminates at a leading surface. One interface has a stop surface. The leading surface is originally separated from the stop surface by a gap. As the interfaces slidably move, the gap lessens until the leading surface abuts the stop surface.
  • the tangentially cut rod packing ring also comprises a second ring formed from a plurality of segments. The second ring has a first portion and a second portion. The first portion forms as shelf on which the first ring sits. The second portion surrounds the first ring. An elastic member in a groove on the outer surface of the second portion provides a compressive force on both the second ring and the first ring.
  • a packing ring set for a rod comprises a first ring comprising a plurality of segments formed by tangential cuts along a first ring segment interface between each of the plurality of segments wherein each of the plurality of segments is slidably movable along the first ring segment interface, the first ring having a first ring inner diameter and a first ring outer diameter; a second ring having an outer surface comprising a plurality of segments formed by tangential cuts along a second ring interface between each of the plurality of segments wherein each of the plurality of segments is slidably movable along the second ring segment interface, the second ring comprising: a first portion having a first portion inner diameter and a first portion outer diameter a second portion having a second portion inner diameter substantially equal to the first ring outer diameter and a second portion outer diameter substantially equal to the first portion outer diameter such that the first portion and second portion together form a shelf sized to accommodate the first ring; a groove formed on the outer surface of the second ring
  • the elastic member comprises a spring. In certain aspects, the elastic member comprises an o-ring.
  • the first ring segment interface each have a leading surface and a stop surface such each leading surface has a corresponding stop surface such that the plurality of segments slidably move with respect to each other until at least one leading surface abuts at least one stop surface.
  • the second ring segment interface each are through cuts.
  • the first portion inner diameter is substantially equal to the first ring inner diameter. In other embodiments, the first portion inner diameter is greater than the first ring inner diameter.
  • the first ring further has a gap that initially separates the leading surface from its corresponding stop surface.
  • the gap initially separating the leading surface from its corresponding stop surface is between 1 and 10 millimeters. In certain embodiments is greater than 4 millimeters. In certain embodiments, the gap is between 4 millimeters and 10 millimeters. In certain embodiments, the gap is between 6 and 8 millimeters. In certain embodiments, the gap is no more than 8 millimeters. In certain embodiments, the gap is about 8 millimeters.
  • the apparatus comprises a piston rod moving between a high pressure and a low pressure; and a packing ring set for the rod, comprising: a first ring comprising a plurality of segments formed by tangential cuts along a first ring segment interface between each of the plurality of segments wherein each of the plurality of segments is slidably movable along the first ring segment interface, the first ring having a first ring inner diameter and a first ring outer diameter; a second ring having an outer surface comprising a plurality of segments formed by tangential cuts along a second ring interface between each of the plurality of segments wherein each of the plurality of segments is slidably movable along the second ring segment interface, the second ring comprising: a first portion having a first portion inner diameter and a first portion outer diameter a second portion having a second portion inner diameter substantially equal to the first ring outer diameter and a second portion outer diameter substantially equal to the first portion outer diameter such that the first portion and second portion together form
  • FIG. 1A is a plan view of a tangentially cut packing ring consistent with the prior art.
  • FIG. 1B is a plan view of a tangentially cut packing ring consistent with the prior art.
  • FIG. 2 is a view of the tangentially cut packing ring of FIG. 1 and a secondary radial cut ring on a rotor.
  • FIG. 3 provides perspective views of the tangentially cut packing ring consistent with the technology of the present application.
  • FIG. 4 shows a segment of the first ring of FIG. 3 .
  • FIG. 5 is a partially exploded view of the tangentially cut packing ring of FIG. 3 .
  • FIG. 6 is a cross-sectional view of a portion of the tangentially cut packing ring of FIG. 3 (without the elastic member).
  • FIG. 7 is a side-by-side plan view of the first ring and the second ring of the tangentially cut packing ring of FIG. 3 .
  • the tangential rod packing ring 300 comprises a first ring 310 .
  • the first ring 310 comprises a first inner diameter 1 ID and a first outer diameter 1 OD.
  • the first ring 310 has a first radial width 1 RW, which is 1 OD- 1 ID, and a first axial thickness 1 T.
  • the first ring 310 has three segments 311 that slidably abut along interfaces 312 (see FIG. 4 ). Each segment 311 has at least one radial extending relief channel 314 or groove 314 .
  • the first ring 310 is set into a second ring 350 .
  • the second ring 350 comprises a first portion 352 and a second portion 354 .
  • the first portion has a second inner diameter 2 ID, which is equal to the first inner diameter 1 ID
  • the second portion 354 has a third inner diameter 3 ID, which is equal to the first outer diameter 1 OD.
  • the second ring 350 also comprises a second outer diameter 2 OD, which is shown as consistent for both the first portion 352 and the second portion 354 .
  • the first portion 352 of the second ring 350 has a second axial thickness 2 T and the second portion 354 of the second ring 350 has a third axial thickness 3 T (see FIG. 6 ).
  • the maximum axial thickness of the second ring 350 comprises 2 T+ 3 T.
  • the first axial thickness 1 T, the second axial thickness 2 T, and the third axial thickness 3 T are all equal (see FIG. 6 ).
  • first portion 352 may have an inner diameter 2 ID that is slightly larger than the inner diameter 1 ID of the first ring 310 . This would provide that a portion of the first ring 310 contacting the rod may overhang the shelf 607 (shelf 607 shown in FIG. 6 ).
  • the second ring 350 in certain aspects may be held open by the segments 311 of the first ring 310 . This may facilitate easier installation on the rod.
  • FIG. 4 shows segments 311 1-3 , such as segment 311 1 in detail.
  • the segments 311 2,3 would be identical and will not be described herein.
  • the segment 311 1 includes a first and a second interface surface 312 to slidably engage a corresponding interface surface in the segments 311 2,3 .
  • One interface surface 312 terminates at a leading surface 314 .
  • the other interface surface 312 terminates at a stop surface 316 .
  • the elastic member described below
  • the original configuration of the tangential rod packing ring 300 is such that the first ring 310 has leading surfaces 314 separated from the stop surfaces 316 by gaps 318 (see FIG. 5 ).
  • the second ring 350 shown partially exploded, also is formed into segments 351 1-3 .
  • the segments 351 1-3 of the second ring are tangentially cut such that each segment includes a first and a second interface surface 352 .
  • the second interface surfaces 352 are through cuts and do not terminate at a leading surface or a stop surface as explained above with respect to the first ring 310 .
  • the second ring 350 will continue to compress until the first ring 210 is stopped by leading surfaces 314 abutting stop surfaces 316 .
  • the tangential cuts on the first ring 310 and the second ring 350 offset by a few degrees around the circumference such that the gap 318 does not provide a leak path.
  • the offset is set such that the interfaces 312 and 352 are parallels. Combining two tangential rod packing rings may provide for better sealing than conventional packing ring sets.
  • the gap 318 separating the segments 311 of the first ring 310 may be larger for the tangentially cut packing ring 300 of the present application than a conventional ring.
  • the gap is no more than about 3 millimeters. This limit is generally due to breakage in view of the edges of the parts.
  • the capture of the first ring 310 in the second ring 350 provides support for the first ring 310 parts. This allows the gap 318 to be expanded initially to 4, 5, 6, 7, or perhaps even 8 or 10 millimeters.
  • the larger gap 318 allows for a longer run life as it allows for more wear.
  • FIG. 6 shows a cross-sectional view of the tangential rod packing ring 300 .
  • the tangential rod packing ring 300 includes the first ring 310 , on the pressure, pump, or cylinder facing side 600 (sometimes referred to as forward facing), and the second ring 350 having both a forward facing side 602 and a back facing side 604 .
  • the first ring 310 also comprises a back facing side 606 that is flush with the shelf 607 (sometimes referred to as a ledge or shoulder) formed in the second ring, which is explained below.
  • the second ring includes an outer surface 608 that includes a groove 610 .
  • An elastic member 320 shown in FIG.
  • the elastic member 320 may be a metallic spring, as mentioned, or a plastic spring. In certain aspects the elastic member 320 may be an o-ring, a plastic (elastic) solid wire spring, or the like.
  • the compressive force provided by the elastic member 320 is shared by the inner surface of the first ring 310 and the inner surface of the first portion 352 of the second ring 350 . Sharing the compressive force of the single elastic member may reduce friction between the rod and the respective inner surfaces, which may result in less heating, wear, and result in a longer life for the tangentially cut packing ring 300 .
  • the first ring 310 may engage the rod individually (when the inner diameter 1 ID is less than the inner diameter 2 ID) to allow some initial wear prior to the inner surface of the second ring 350 engaging the rod. Lifting the second ring 350 off the rid may prolong the life of the tangentially cut rod packing ring 300 .
  • FIG. 6 generally shows that the inner diameter 3 ID of the second portion 354 of the second ring 350 is substantially equal to the outer diameter 1 OD of the first ring 310 .
  • the inner diameter 3 ID may be larger than the outer diameter 1 OD. This would allow for a certain amount of wear prior to contact between the outer surface of the first ring 310 and the inner surface of the second portion 354 of the second ring.
  • FIG. 7 shows a plan view of the tangential rod packing ring 300 with the first ring 310 removed from the second ring 350 .
  • the first portion 352 of the second ring 350 has a second radial width of 2 RW and the second portion 354 of the second ring 350 has a third radial width 3 RW.
  • the second radial width 2 RW is greater than the third radial width 3 RW, and the second radial width 2 RW is equal to 1 RW+ 3 RW.
  • the first portion 352 extends inwardly from the second portion 354 forming a contiguous shelf 700 having a radial width equal to 1 RW such that the first ring 310 rests on the shelf 700 and the outer surface of the first ring 310 abuts the inner surface of the second portion 354 .
  • the elastic member 320 squeezes the second ring 350 , and the compressive force is transmitted through the second ring 350 to the first ring by the inner surface of the second portion 354 pushing on the outer surface of the first ring 310 . While shown as contiguous, the shelf 700 may be segmented in certain embodiments.
  • the second portion 354 has at least one radial extending relief 702 .
  • the radial extending relief 702 in the second portion 354 corresponds to the relief 314 in the first ring 310 .
  • the reliefs 314 and 702 allow for pressure relief.
  • the elastic member 320 may comprise non-metallic material including an o-ring, a plastic (elastic) solid wire spring, or the like. The design, allowing for non-metallic material, may decrease rod damage.
  • a stated range of 1 to 10 should be considered to include and provide support for claims that recite any and all subranges or individual values that are between and/or inclusive of the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more and ending with a maximum value of 10 or less (e.g., 5.5 to 10, 2.34 to 3.56, and so forth) or any values from 1 to 10 (e.g., 3, 5.8, 9.9994, and so forth).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
US15/592,391 2016-05-17 2017-05-11 Rod packing Abandoned US20170335972A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/592,391 US20170335972A1 (en) 2016-05-17 2017-05-11 Rod packing
US17/463,334 US11719344B2 (en) 2016-05-17 2021-08-31 Rod packing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662337635P 2016-05-17 2016-05-17
US15/592,391 US20170335972A1 (en) 2016-05-17 2017-05-11 Rod packing

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US17/463,334 Continuation US11719344B2 (en) 2016-05-17 2021-08-31 Rod packing

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US15/592,391 Abandoned US20170335972A1 (en) 2016-05-17 2017-05-11 Rod packing
US17/463,334 Active US11719344B2 (en) 2016-05-17 2021-08-31 Rod packing

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN114555944A (zh) * 2019-08-13 2022-05-27 法伊韦利传送器意大利有限公司 具有互补密封元件的往复式压缩机用活塞
US11415227B2 (en) * 2019-08-21 2022-08-16 Raytheon Technologies Corporation Non-contact seal assembly with chamfered seal shoe
US11719344B2 (en) 2016-05-17 2023-08-08 Compressor Products International, Llc Rod packing

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Publication number Priority date Publication date Assignee Title
CN110480269B (zh) * 2019-08-21 2021-06-18 扬中市三利石化机械有限公司 改进型切向环加工工艺

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US11719344B2 (en) 2023-08-08
CA2967380A1 (fr) 2017-11-17
EP3246569B1 (fr) 2021-05-05
US20220120347A1 (en) 2022-04-21
EP3246569A1 (fr) 2017-11-22

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