Mechanical Seal

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Goulds RPK3656M Mechanical Seal Kit
Goulds RPK3656M Mechanical Seal Kit
$75.00
quality
Chesterton 880 Mechanical Seal 53115 Shaft Size 2250
Chesterton 880 Mechanical Seal 53115 Shaft Size 2250
$34.00
quality
Chesterton Mechanical Seal Item 040181 Seal Size 12 Shaft Size 15 241E12SA
Chesterton Mechanical Seal Item 040181 Seal Size 12 Shaft Size 15 241E12SA
$75.00
quality
EGG SEALOL MECHANICAL SEAL RSD43214  RSD 43214
EGG SEALOL MECHANICAL SEAL RSD43214 RSD 43214
$25.00
quality
Dresser Pump Division PO 2895 00 Mechanical Seal Seat Assy 63mm OD 46mm ID
Dresser Pump Division PO 2895 00 Mechanical Seal Seat Assy 63mm OD 46mm ID
$35.99
quality
NEW DURAMETALLIC 79714 61068 B20140 1 3 4IN MECHANICAL PUMP SEAL D514085
NEW DURAMETALLIC 79714 61068 B20140 1 3 4IN MECHANICAL PUMP SEAL D514085
$126.28
quality
FLOWSERVE A PSS II 6000 MECHANICAL SEAL E42EFVV 9502 REV 5 NIB
FLOWSERVE A PSS II 6000 MECHANICAL SEAL E42EFVV 9502 REV 5 NIB
$299.99
quality
FLOWTECH P N5120 30MM Single Mechanical Seal Carbon VS SS NEW
FLOWTECH P N5120 30MM Single Mechanical Seal Carbon VS SS NEW
$49.50
quality
Goetze Mechanical Seal p n 76 62 52 80 13
Goetze Mechanical Seal p n 76 62 52 80 13
$6.99
quality
Chesterton 155 Cartridge Single Mechanical Seal 50mm Shaft New Warman Pump
Chesterton 155 Cartridge Single Mechanical Seal 50mm Shaft New Warman Pump
$224.25
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New John Crane 3710 Mechanical Seal 2750 Repair Kit
New John Crane 3710 Mechanical Seal 2750 Repair Kit
$79.99
quality
New John Crane 3710 Mechanical Seal 300 Rebuild Kit
New John Crane 3710 Mechanical Seal 300 Rebuild Kit
$79.99
quality
Mechanical seal double face 3 inch L75634 T1DBL Crane Packing Unused
Mechanical seal double face 3 inch L75634 T1DBL Crane Packing Unused
$450.00
quality
John Crane 2 Type 21 Mechanical Seal X5268333 NEW Surplus
John Crane 2 Type 21 Mechanical Seal X5268333 NEW Surplus
$45.00
quality
Flowserve 125 Type 21 Mechanical Seal 68867902 NEW Surplus
Flowserve 125 Type 21 Mechanical Seal 68867902 NEW Surplus
$20.00
quality
John Crane 0625 Type 6A Mechanical Seal CPM10015 NEW Surplus
John Crane 0625 Type 6A Mechanical Seal CPM10015 NEW Surplus
$40.00
quality
20mm Pump Rubber Bellow Shaft Mechanical Seal For Waterpumps Gas Pumps
20mm Pump Rubber Bellow Shaft Mechanical Seal For Waterpumps Gas Pumps
$3.99
quality
NEW DURAMETALLIC 1875 SHAFT SIZE DOUBLE MECHANICAL SEAL
NEW DURAMETALLIC 1875 SHAFT SIZE DOUBLE MECHANICAL SEAL
$150.00
quality
NEW GENUINE FLOWSERVE CORP MECHANICAL SEAL PP TEDR5875W33 NIB MINT
NEW GENUINE FLOWSERVE CORP MECHANICAL SEAL PP TEDR5875W33 NIB MINT
$149.99
quality
NEW GENUINE FLOWSERVE CORP BASIC MECHANICAL SEAL 4875 D48755N5A 6002743 NIB
NEW GENUINE FLOWSERVE CORP BASIC MECHANICAL SEAL 4875 D48755N5A 6002743 NIB
$224.99
quality
Flowserve A2R112639 06 Mechanical Seal
Flowserve A2R112639 06 Mechanical Seal
$99.00
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NEW FLOWSERVE 147033 MECHANICAL SEAL DURASEAL GEB2736501B SHAFT SIZE 1750
NEW FLOWSERVE 147033 MECHANICAL SEAL DURASEAL GEB2736501B SHAFT SIZE 1750
$329.99
quality
CHESTERTON 442 Split Mechanical Seal 691595 Size 22 Shaft 2750
CHESTERTON 442 Split Mechanical Seal 691595 Size 22 Shaft 2750
$1,523.00
quality
JOHN CRANE MECHANICAL SEAL 35mm Type 2 03812XXXXXN352A
JOHN CRANE MECHANICAL SEAL 35mm Type 2 03812XXXXXN352A
$45.00
quality
JOHN CRANE MECHANICAL SEAL 125 Type 680 SQSEL DRAW603407
JOHN CRANE MECHANICAL SEAL 125 Type 680 SQSEL DRAW603407
$35.00
quality
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 2
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 2
$229.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 2
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 2
$229.99
quality
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 1
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 1
$229.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 1
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 1
$229.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 3
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 3
$229.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 4
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 4
$229.99
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NEW JOHN CRANE M120171 8B1 1 1 2IN MECHANICAL SEAL ASSEMBLY D513394
NEW JOHN CRANE M120171 8B1 1 1 2IN MECHANICAL SEAL ASSEMBLY D513394
$271.28
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NEW FLOWSERVE PEERLESS PUMP SEAL MECHANISM GKB2135511B 13
NEW FLOWSERVE PEERLESS PUMP SEAL MECHANISM GKB2135511B 13
$750.00
quality
Chesterton Mechanical Seal Repair Kit 241 12 SPK TC CB S Size 12 NIB
Chesterton Mechanical Seal Repair Kit 241 12 SPK TC CB S Size 12 NIB
$175.00
quality
Armstrong Pumps 975000 982 Mechanical Seal Kit 2A
Armstrong Pumps 975000 982 Mechanical Seal Kit 2A
$120.00
quality
NEW SEPCO MECHANICAL COMPLETE SEAL UAA0056DTP AQAA 00 3 1 2 Type DTP 316SS
NEW SEPCO MECHANICAL COMPLETE SEAL UAA0056DTP AQAA 00 3 1 2 Type DTP 316SS
$499.99
quality
Monarch Mechanical Pump Seal 240396
Monarch Mechanical Pump Seal 240396
$175.00
quality
NEW SAFEMATIC SAF 80 QREG 301578 STEEL MECHANICAL PUMP SEAL D495578
NEW SAFEMATIC SAF 80 QREG 301578 STEEL MECHANICAL PUMP SEAL D495578
$213.53
quality
SMC NVZM450 N01 08 5 Port Mechanical Valve Metal Seal
SMC NVZM450 N01 08 5 Port Mechanical Valve Metal Seal
$40.99
quality
NEW SEPCO MECHANICAL COMPLETE SEAL UAA0040BSS AIAA 00 2 1 2 Type BSS 316SS
NEW SEPCO MECHANICAL COMPLETE SEAL UAA0040BSS AIAA 00 2 1 2 Type BSS 316SS
$350.00
quality
Mechanical shaft seal PK 0842 for Nash Engineering MHC 25 Unused
Mechanical shaft seal PK 0842 for Nash Engineering MHC 25 Unused
$70.00
quality
NEW JOHN CRANE FSP 1959 MECHANICAL SEAL ASSEMBLY KIT 2 1 8IN TYPE 2 D377113
NEW JOHN CRANE FSP 1959 MECHANICAL SEAL ASSEMBLY KIT 2 1 8IN TYPE 2 D377113
$175.53
quality
JOHN CRANE MECHANICAL SEAL M106638 TYPE 5610 SIZE 1750 NEW IN BOX
JOHN CRANE MECHANICAL SEAL M106638 TYPE 5610 SIZE 1750 NEW IN BOX
$224.99
quality
FLOWSERVE 162030 MECHANICAL SEAL
FLOWSERVE 162030 MECHANICAL SEAL
$29.00
quality
John Crane B964 09 Type 8B1T Mechanical Seal HSP 33918 Size 1875 Mat JF511O15H
John Crane B964 09 Type 8B1T Mechanical Seal HSP 33918 Size 1875 Mat JF511O15H
$299.00
quality
Mechanical Seal Kit for 225 Shaft 2 1 4 Pump Seal 14032701
Mechanical Seal Kit for 225 Shaft 2 1 4 Pump Seal 14032701
$128.50
quality
new durametallic 90 17213 mechanical pump seal
new durametallic 90 17213 mechanical pump seal
$149.99
quality
new durametallic 120485 mechanical pump seal
new durametallic 120485 mechanical pump seal
$169.99
quality
JOHN CRANE MSC 1132 1750 1 MECHANICAL SEAL NSFB
JOHN CRANE MSC 1132 1750 1 MECHANICAL SEAL NSFB
$69.95
quality
JOHN CRANE FSD 3020 1250 2 MECHANICAL SEAL NSFB
JOHN CRANE FSD 3020 1250 2 MECHANICAL SEAL NSFB
$69.95
quality
new durametallic 166810 mechanical pump seal
new durametallic 166810 mechanical pump seal
$159.99
quality
JOHN CRANE 8BT1 BOM M119726 MECHANICAL SEAL SIZE 1625
JOHN CRANE 8BT1 BOM M119726 MECHANICAL SEAL SIZE 1625
$179.99
quality
EAGLE BURGMANN Mechanical Seal Desc Mu 75 G7 Silicon Faces Metal3166SS O RING
EAGLE BURGMANN Mechanical Seal Desc Mu 75 G7 Silicon Faces Metal3166SS O RING
$89.99
quality
DEKKER VACUUM PUMP Mechanical Seal Part 6220 0055 000
DEKKER VACUUM PUMP Mechanical Seal Part 6220 0055 000
$112.50
quality
Mechanical seal for Multiquip QP301TH 0801123530
Mechanical seal for Multiquip QP301TH 0801123530
$34.95
quality
37940 New In box Hutcheson Engineering 10K25 VI Mechanical Pump Seal 2 OD
37940 New In box Hutcheson Engineering 10K25 VI Mechanical Pump Seal 2 OD
$33.68
quality
JOHN CRANE SEAL MECHANICAL 1 P N 542459 NEW IN BOX
JOHN CRANE SEAL MECHANICAL 1 P N 542459 NEW IN BOX
$220.00
quality
John Crane Mechanical Seal 1375 Type 9 Teflon B31683 for Blackmer Pump 332203
John Crane Mechanical Seal 1375 Type 9 Teflon B31683 for Blackmer Pump 332203
$275.00
quality
NEW ENVIROTECH 0660472JC ROTO JET MECHANICAL PUMP SEAL 2 1 2IN D521199
NEW ENVIROTECH 0660472JC ROTO JET MECHANICAL PUMP SEAL 2 1 2IN D521199
$100.00
quality
John crane Mechanical Elastomer Seal NEW Pump drive seals M188164
John crane Mechanical Elastomer Seal NEW Pump drive seals M188164
$99.00
quality
NIB BURGMANN MG1S 25 Z MECHANICAL SEAL
NIB BURGMANN MG1S 25 Z MECHANICAL SEAL
$195.99
quality
Flowserve Pac Seal Mechanical Elastomer Seal NEW Pump drive seals 758V
Flowserve Pac Seal Mechanical Elastomer Seal NEW Pump drive seals 758V
$99.00
quality
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
$199.00
quality
6 1 2 MECHANICAL FLANGE SEAL
6 1 2 MECHANICAL FLANGE SEAL
$49.99
quality
MECHANICAL SEAL TSP 20 30 NEW
MECHANICAL SEAL TSP 20 30 NEW
$29.99
quality
New John Crane Mechanical Wedge Seal Ring PTFE 2375 Type FLTG Free Shipping
New John Crane Mechanical Wedge Seal Ring PTFE 2375 Type FLTG Free Shipping
$38.99
quality
JOHN CRANE 8 1T DRW CFSP37128 MECHANICAL SEAL SIZE 1750 NEW IN BOX 99
JOHN CRANE 8 1T DRW CFSP37128 MECHANICAL SEAL SIZE 1750 NEW IN BOX 99
$99.00
quality
NEW DURA SEAL LE3F1375DZ3 1 M12377 99 MECHANICAL SEAL
NEW DURA SEAL LE3F1375DZ3 1 M12377 99 MECHANICAL SEAL
$199.99
quality
Price Pump 8302 211 Mechanical seal NEW
Price Pump 8302 211 Mechanical seal NEW
$99.00
quality
NEW IN BOX JOHN CRANE MECHANICAL SPRING SEAL 2Q00 RSD1122V 1 00008 0115 0
NEW IN BOX JOHN CRANE MECHANICAL SPRING SEAL 2Q00 RSD1122V 1 00008 0115 0
$25.99
quality
John Crane B66429 Mechanical Seal Assembly 0750 New
John Crane B66429 Mechanical Seal Assembly 0750 New
$18.95
quality
Durametallic 139715 Mechanical Seal 2125 Outside RA Seal NOS
Durametallic 139715 Mechanical Seal 2125 Outside RA Seal NOS
$69.95
quality
Durametallic Mechanical Seal GEA1463511A 4OD 1 7 16ID NOS
Durametallic Mechanical Seal GEA1463511A 4OD 1 7 16ID NOS
$49.95
quality
Durametallic 125722 Mechanical Seal 1 7 8 ID NOS
Durametallic 125722 Mechanical Seal 1 7 8 ID NOS
$49.95
quality
Durametallic 53730 Mechanical Seal 1 1 2 Outside RA NOS
Durametallic 53730 Mechanical Seal 1 1 2 Outside RA NOS
$49.95
quality
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
$55.00
quality
Durametallic 98806 Mechanical Seal 1 3 8 Inside RO NOS
Durametallic 98806 Mechanical Seal 1 3 8 Inside RO NOS
$49.95
quality
Durametallic 53730 Mechanical Seal 1 1 2 Outside RA C NOS
Durametallic 53730 Mechanical Seal 1 1 2 Outside RA C NOS
$49.95
quality
Durametallic 81967 Mechanical Seal 1 1 8 Inside RO NOS
Durametallic 81967 Mechanical Seal 1 1 8 Inside RO NOS
$39.95
quality
1750 Flowserve G ISC2 PX single fexible stator Mechanical Seal C2CPX1750ECXPB
1750 Flowserve G ISC2 PX single fexible stator Mechanical Seal C2CPX1750ECXPB
$105.00
quality
NEW JOHN CRANE TYPE 9DBL PTFE MECHANICAL WEDGE SEAL 2000 B521 73
NEW JOHN CRANE TYPE 9DBL PTFE MECHANICAL WEDGE SEAL 2000 B521 73
$499.99
quality
NEW MECHANICAL PUMP SHAFT SEAL KIT 1 1 4 ID
NEW MECHANICAL PUMP SHAFT SEAL KIT 1 1 4 ID
$50.00
quality
John Crane HOU 2888 APLC Mechanical Seal Seat
John Crane HOU 2888 APLC Mechanical Seal Seat
$59.00
quality
MECHANICAL SEAL B209B SPRING IS 1 7 8 L X 2 1 8 DIA  RING 2 3 8 DIA
MECHANICAL SEAL B209B SPRING IS 1 7 8 L X 2 1 8 DIA RING 2 3 8 DIA
$25.00
quality
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Mechanical Seal

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Mechanical Seals

Mechanical+Seal

Using Ultrananocrystalline Diamond To Improve Mechanical Seal Performance

A mechanical seal is a critical component whose useful life significantly impacts the overall reliability and robustness of pump or centrifugal compressor. Unscheduled or premature failure of the seal leads to increased maintenance and increased overall equipment costs to the user. The overall performance of a mechanical seal often is most affected by the performance of the faces and the intervening lubricating film. This primary element of a mechanical seal represents a classic problem in the science of tribology, the study of friction, wear and lubrication.

The demands placed on seal faces require careful attention to the issues of wear resistance, chemical compatibility, mechanical and thermal properties—all of which are determined by the end use application and overall seal design. When a mechanical seal is used in a pump, the liquid in the pump is used to cool and lubricate the seal faces. The seal faces are in sliding contact and prevent the liquid in the pump from reaching atmosphere. This contact also generates frictional heat that must be removed from the seal faces. Failure to remove this unwanted heat often results in the boiling of the lubricating liquid film at the seal faces, usually leaving a deleterious residue and causing premature failure of elastomeric components in the seals (static-secondary seals). Both of these undesirable effects of elevated temperatures lead to premature seal failure.

The ability to maintain coolant on the seal face is even more critical when compounded by the demands associated with the pumping of abrasive media or a pump’s ability to withstand intermittent and unscheduled coolant loss. The ability to run two hard-faced seal materials such as SiC against each other often is desirable but not practical due to the premature failures that result from elevated temperatures caused by friction at the seal interface.

In the case of a centrifugal gas compressor, a noncontacting mechanical seal is used to contain the gas within the machine. A lift mechanism, such as spiral grooves, is included in the design of the seal. During operation the seal faces do not make contact except at startup and shutdown. The intense frictional heat occurring at this time must be controlled or face damage can occur.

Based on the benefits nature’s hardest substance would appear to offer for this application, the idea of using the diamond as a wear resistant face material in seals is not new. Diamond also possesses many other attractive properties, including extremely high thermal conductivity and chemical resistance. Unfortunately, previous attempts at integrating diamond into seal faces failed due to difficulties in ensuring that the diamond face presented the necessary surface finish required for such a demanding tribological application. Following extensive research and development and improvements in equipment and processes, those problems appear to have been solved.

Today, a new form of diamond with ultrananocrystalline grains has entered the industrial arena. Invented at Argonne National Laboratory and commercialized for seals by John Crane, Inc. and Advanced Diamond Technologies, Inc., UNCD?, as it is commercially known, provides the surface roughness typical of normal, unprocessed seal. UNCD has been dynamically tested and shown to signifi- cantly reduce the frictional heat and increase the life of the seal faces in accelerated wear. The work highlighted in this article was completed, in part, by funding from the National Science Foundation and the Department of Energy.

Manufacturing hurdles

One of the major obstacles in providing a diamond-treated surface for a mechanical seal is maintaining the surface flatness and roughness necessary to achieve sealing. Early work in diamond surfacing placed extreme demands on finishing and polishing the diamond to meet the required metrology and geometric specifications of a seal face. Surfaces were rough and had a high degree of waviness. Additional lapping of the diamond surface to achieve sealing could not be done cost-effectively due to the hardness of diamond. Consequently, many researchers abandoned the idea of using diamond as a surface for seals.

The development of ultrananocrystalline diamond (UNCD), though, generated renewed interest in diamondtreated seal faces. The process demonstrated that the base material could be treated with diamond without changing its original flatness. This was a major breakthrough in the manufacturing technology for diamond-structured surfaces. At last, diamond could be applied to a seal face without any further work to achieve the desired flatness for sealing fluids. Moreover, UNCD, unlike other diamond films, has nanometer-scale roughness that allows as-deposited UNCD to have sufficient smoothness so that it doesn’t degrade a soft counterface. In other words, UNCD works in both hard on hard and hard on soft sealing applications.

Still, there was an additional obstacle to overcome. Work to this point was done to transfer this laboratory-scale process to meet the demand of seal production. New equipment and processes had to be designed to handle a larger volume of seals at one time. Once this was done, the new equipment and processes had to be validated. Tests were run on production parts and compared to those run on the smaller scale equipment. Continuous testing confirmed that the production parts met the early results for friction and wear testing of parts manufactured on the smaller scale equipment.

Friction testing

Friction plays an important part in the success or failure of a set of seal faces. Not all materials make good seal faces. Some materials have properties that hold heat in the seal face, while others wear too much. Applying diamond to a seal face reduces both friction and wear. One of the best substrate materials for diamond is silicon carbide. Silicon carbide and diamond have very similar material properties. Results of friction testing for UNCD on a SiC face are as follows:

Carbon running against UNCD on silicon carbide μ = 0.07

Silicon carbide running against UNCD on silicon carbide μ = 0.04

The results for carbon versus UNCD on silicon carbide were expected. This is a normal value for friction in seal design work. The results for silicon carbide versus UNCD on silicon carbide were very good. When silicon carbide runs against itself without any diamond treatment, the coefficient of friction is greater than 0.1. For those applications requiring hard-on-hard seal faces, the application of a diamond-treated seal face is a major improvement. Several groups of seal faces have been tested, resulting in the same friction values.

Dynamic testing

An important step in qualifying materials for a mechanical seal is dynamic testing in hot water. This test involves running a 1.375 diameter seal in 250 F water at 100 psig and 3450 rpm. At these conditions, the pressure-velocity value for the seal is 170,000 psi x ft/min. This test in hot water is very demanding of the seal. Each test run consists of running a group of four pumps, three fi tted with seals treated with diamond and one without a treated surface. The results of hot-water testing were outstanding for the diamond-treated seals. Very minimal or no measureable wear occurred over the 100-hour test. The untreated silicon carbide seals in each case failed due to heavy wear across the entire seal face.

These results were typical for each test run. The UNCD-treated surfaces were in excellent condition with very little carbon wear. The untreated seal had high wear for both the carbon and silicon carbide seal faces.

An interesting measurement taken after testing was surface flatness. The diamond-treated
mechanical seal
had no change in surface flatness during testing. The untreated silicon carbide had an increase of 240 microinches. This is an indication that the untreated surface was running hotter than the diamond-treated surface. Continued increases in flatness or surface waviness will lead to unwanted seal leakage and wear.

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