Mechanical Seal

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10 PCS 28mm External Diameter 4mm Thick Mechanical Rubber Oring Seal
10 PCS 28mm External Diameter 4mm Thick Mechanical Rubber Oring Seal
$5.49
quality
Gorman Rupp Self Lubricating Mechanical Seal
Gorman Rupp Self Lubricating Mechanical Seal
$39.99
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
$98.50
quality
JABSCO MECHANICAL PUMP SEAL KIT 6408 0000 FITS SEVERAL PUMP MODELS
JABSCO MECHANICAL PUMP SEAL KIT 6408 0000 FITS SEVERAL PUMP MODELS
$29.99
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
CHESTERTON 046813 MECHANICAL SEAL NSFB
CHESTERTON 046813 MECHANICAL SEAL NSFB
$101.95
quality
Gogoal Mechanical Seal MG1 shaft size 16mm Replace Burgmann MG1 16mm and AESS
Gogoal Mechanical Seal MG1 shaft size 16mm Replace Burgmann MG1 16mm and AESS
$27.76
quality
HARBOUR SEALING MECHANICAL SEAL 5 8 HSS T21 5 C TC 504138D NEW IN BOX
HARBOUR SEALING MECHANICAL SEAL 5 8 HSS T21 5 C TC 504138D NEW IN BOX
$35.00
quality
Mechanical Seal Face Carbon Ring 7935ODX5IDX869 Width LOC1200
Mechanical Seal Face Carbon Ring 7935ODX5IDX869 Width LOC1200
$69.99
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
$46.79
quality
Mechanical seal for Multiquip QP301TH 0801123530
Mechanical seal for Multiquip QP301TH 0801123530
$34.95
quality
Gorman Rupp Seal Kit new missing part number Self Lubricating Mechanical Seal
Gorman Rupp Seal Kit new missing part number Self Lubricating Mechanical Seal
$49.99
quality
A8 1 New Delta AV30001125A Mechanical seal
A8 1 New Delta AV30001125A Mechanical seal
$122.00
quality
NEW FLOWSERVE 11MRX316731 04MEX6751B1 425 IN MECHANICAL PUMP SEAL D542146
NEW FLOWSERVE 11MRX316731 04MEX6751B1 425 IN MECHANICAL PUMP SEAL D542146
$217.28
quality
EAGLE BURGMANN CARTEX ASP 3250 MECHANICAL SEAL NEW
EAGLE BURGMANN CARTEX ASP 3250 MECHANICAL SEAL NEW
$1,450.00
quality
6 1 2 MECHANICAL FLANGE SEAL
6 1 2 MECHANICAL FLANGE SEAL
$49.99
quality
JOHN CRANE SEAL ASSEMBLY 4625 ESP SIZE MECHANICAL SEAL New in BOX
JOHN CRANE SEAL ASSEMBLY 4625 ESP SIZE MECHANICAL SEAL New in BOX
$349.00
quality
Blackmer Mechanical Seal Assembly  P N 334414 Fits a CRL2 Pump
Blackmer Mechanical Seal Assembly P N 334414 Fits a CRL2 Pump
$100.00
quality
MECHANICAL SEAL TSP 20 30 NEW
MECHANICAL SEAL TSP 20 30 NEW
$29.99
quality
Dayton Mechanical Shaft Seal Models 1R2981R3011R3041R3051R307
Dayton Mechanical Shaft Seal Models 1R2981R3011R3041R3051R307
$19.99
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
$79.20
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 JOHN CRANE TYPE EZ 1 MECHANICAL SEAL R704585 2750 SHAFT DIA New
NEW JOHN CRANE TYPE EZ 1 MECHANICAL SEAL R704585 2750 SHAFT DIA New
$199.50
quality
new jabsco pump 8728 0000 mechanical seal part
new jabsco pump 8728 0000 mechanical seal part
$69.99
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
John Crane International Mechanical Seal HSP27648 1 1 PN C214 71 54
John Crane International Mechanical Seal HSP27648 1 1 PN C214 71 54
$51.75
quality
NEW JOHN CRANE TYPE 1100 MECHANICAL SEAL 2750 SHAFT DIA New in BOX
NEW JOHN CRANE TYPE 1100 MECHANICAL SEAL 2750 SHAFT DIA New in BOX
$269.50
quality
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
$55.00
quality
Gogoal Mechanical Seal G3 16mm for Grundfos Industrial Pump New
Gogoal Mechanical Seal G3 16mm for Grundfos Industrial Pump New
$45.56
quality
Flowserve Mechanical Single Cartridge Seal 1 3 8 85 11AVX Series 80
Flowserve Mechanical Single Cartridge Seal 1 3 8 85 11AVX Series 80
$200.00
quality
Flowserve Mechanical Single Cartridge Seal 2 3 8 R84 19SV
Flowserve Mechanical Single Cartridge Seal 2 3 8 R84 19SV
$295.00
quality
Flowserve Mechanical Single Cartridge Seal 2 3 4 R85 22SV
Flowserve Mechanical Single Cartridge Seal 2 3 4 R85 22SV
$395.00
quality
Flowserve Mechanical Single Cartridge Seal 1 7 8 R85 15AV
Flowserve Mechanical Single Cartridge Seal 1 7 8 R85 15AV
$395.00
quality
Flowserve Mechanical Single Cartridge Seal 1 1 4 85 11AVX
Flowserve Mechanical Single Cartridge Seal 1 1 4 85 11AVX
$195.00
quality
NEW BSM Mechanical Seal 117 713 9030 270
NEW BSM Mechanical Seal 117 713 9030 270
$124.99
quality
NEW PRICE PUMP CO 012111 2 T21 MECHANICAL SEAL
NEW PRICE PUMP CO 012111 2 T21 MECHANICAL SEAL
$62.99
quality
NEW FLOWSERVE C2CPX1375ECXEB MECHANICAL SEAL F ISC2 PX 1375 5Z5T
NEW FLOWSERVE C2CPX1375ECXEB MECHANICAL SEAL F ISC2 PX 1375 5Z5T
$189.99
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
15035 FKM Viton Mechanical Pump Seal Assembly
15035 FKM Viton Mechanical Pump Seal Assembly
$243.60
quality
Banjo 17235 FKM Viton type Mechanical Seal Assembly
Banjo 17235 FKM Viton type Mechanical Seal Assembly
$162.40
quality
Banjo 16713 Mechanical Seal
Banjo 16713 Mechanical Seal
$537.95
quality
Banjo 18435 Mechanical Seal
Banjo 18435 Mechanical Seal
$629.30
quality
NEW MECHANICAL PUMP SHAFT SEAL KIT 1 1 4 ID
NEW MECHANICAL PUMP SHAFT SEAL KIT 1 1 4 ID
$45.00
quality
Banjo 15025 Mechanical Seal
Banjo 15025 Mechanical Seal
$233.45
quality
Ampco Pumps Co Replacement Kit GS8105960 125 Mechanical Seal
Ampco Pumps Co Replacement Kit GS8105960 125 Mechanical Seal
$105.11
quality
AE SEAL MECHANICAL SEAL 3201021J P NBSTS 01G009460 I14A USK232172 R NEW IN BOX
AE SEAL MECHANICAL SEAL 3201021J P NBSTS 01G009460 I14A USK232172 R NEW IN BOX
$100.00
quality
AE SEAL MECHANICAL SEAL 3201243J P NBSTS 01G009460 I14A USK234608 R NEW IN BOX
AE SEAL MECHANICAL SEAL 3201243J P NBSTS 01G009460 I14A USK234608 R NEW IN BOX
$100.00
quality
John Crane HOU 2888 APLC Mechanical Seal Seat
John Crane HOU 2888 APLC Mechanical Seal Seat
$48.00
quality
FLOWSERVE MECHANICAL SEAL PARTS 3201047J P N2R54100DE 0 NEW IN BOX
FLOWSERVE MECHANICAL SEAL PARTS 3201047J P N2R54100DE 0 NEW IN BOX
$100.00
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
US Seal Mechanical Pump Seal PS 1677
US Seal Mechanical Pump Seal PS 1677
$319.00
quality
uxcell 50 Pcs 5mm x 1mm x 3mm Mechanical Black NBR O Rings Oil Seal Washers
uxcell 50 Pcs 5mm x 1mm x 3mm Mechanical Black NBR O Rings Oil Seal Washers
$9.26
quality
Zenith 18 79003 0056 1 187900300561 Mechanical Pump Seal
Zenith 18 79003 0056 1 187900300561 Mechanical Pump Seal
$60.00
quality
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
$21.12
quality
Gogoal Mechanical Mechanical Seals Seal G3 16mm for Grundfos Industrial Pump
Gogoal Mechanical Mechanical Seals Seal G3 16mm for Grundfos Industrial Pump
$45.89
quality
Discflo Model 402 2D Pump Mechanical Seal NEW LOC1194
Discflo Model 402 2D Pump Mechanical Seal NEW LOC1194
$99.99
quality
Gogoal Mechanical seal TYPE21 shaft size 1 5 8 inches for Replace John Crane
Gogoal Mechanical seal TYPE21 shaft size 1 5 8 inches for Replace John Crane
$59.63
quality
Mechanical Seal 95825 119 330502
Mechanical Seal 95825 119 330502
$49.99
quality
Dayton 4KHL6 Gear Pump Mechanical Seal Viton
Dayton 4KHL6 Gear Pump Mechanical Seal Viton
$137.71
quality
AES SEAL 2375 TC TCN 198670 CONVERTER II CARTRIDGE MECHANICAL SEAL NIB
AES SEAL 2375 TC TCN 198670 CONVERTER II CARTRIDGE MECHANICAL SEAL NIB
$275.50
quality
EGG Sealol RSD 2623 Mechanical Rotary Seal Assembly
EGG Sealol RSD 2623 Mechanical Rotary Seal Assembly
$39.99
quality
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
$199.00
quality
JOHN CRANE 0530 5620 Y02759 Mechanical Seal 53mm accessories
JOHN CRANE 0530 5620 Y02759 Mechanical Seal 53mm accessories
$520.00
quality
Cartridge Seal  Mechanical Seal  New In Box  Get Them All Cheap See Pics
Cartridge Seal Mechanical Seal New In Box Get Them All Cheap See Pics
$150.00
quality
BW IP Type QB Mechanical Seal A2R39253 01 Size 4 Flowserve 99PEX265523 NIB
BW IP Type QB Mechanical Seal A2R39253 01 Size 4 Flowserve 99PEX265523 NIB
$675.00
quality
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
$108.95
quality
NEW PPC AS 325 1 14 1200S 3 1 4 IN MECHANICAL PUMP SEAL D542517
NEW PPC AS 325 1 14 1200S 3 1 4 IN MECHANICAL PUMP SEAL D542517
$217.28
quality
NEW JOHN CRANE 707218  500073 MECHANICAL SEAL 7 8
NEW JOHN CRANE 707218 500073 MECHANICAL SEAL 7 8
$75.00
quality
NEW PPC AS 337 2 14 REP 1200S 3 3 8 IN MECHANICAL SHAFT SLEEVE PUMP SEAL D542484
NEW PPC AS 337 2 14 REP 1200S 3 3 8 IN MECHANICAL SHAFT SLEEVE PUMP SEAL D542484
$224.28
quality
NEW PPC AS 225 2 11 1200S 2 1 4 IN MECHANICAL SPLIT PUMP SEAL KIT D542487
NEW PPC AS 225 2 11 1200S 2 1 4 IN MECHANICAL SPLIT PUMP SEAL KIT D542487
$199.28
quality
ZMT 648 150 40Q FACE MECHANICAL SEAL NEW
ZMT 648 150 40Q FACE MECHANICAL SEAL NEW
$25.00
quality
SEAL MECHANICAL PUMP ALLIS CHALMERS 52118510801
SEAL MECHANICAL PUMP ALLIS CHALMERS 52118510801
$114.99
quality
NEW JOHN CRANE M49261 2375 IN TYPE 21 MECHANICAL PUMP SEAL ASSEMBLY D542579
NEW JOHN CRANE M49261 2375 IN TYPE 21 MECHANICAL PUMP SEAL ASSEMBLY D542579
$67.33
quality
JOHN CRANE M196 82 Rotary Mechanical Seal Type 9 Size 1750
JOHN CRANE M196 82 Rotary Mechanical Seal Type 9 Size 1750
$199.95
quality
John Crane Mechanical Seal P N 811578 5 8 Bore Type 21 Special Mating Ring NIB
John Crane Mechanical Seal P N 811578 5 8 Bore Type 21 Special Mating Ring NIB
$50.00
quality
JOHN CRANE 595175 30 S20 MECHANICAL SEAL ASSEMBLY NIB
JOHN CRANE 595175 30 S20 MECHANICAL SEAL ASSEMBLY NIB
$250.50
quality
1 1 4 O Ring Groove Tungsten Carbide Seat Mechanical Seal TORS 1250 1875 NEW
1 1 4 O Ring Groove Tungsten Carbide Seat Mechanical Seal TORS 1250 1875 NEW
$59.99
quality
FLOWSERVE 4R6998SL Silicon Carbide Rotating Face Mechanical Seal
FLOWSERVE 4R6998SL Silicon Carbide Rotating Face Mechanical Seal
$299.96
quality
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
$1,516.00
quality
John Crane Mechanical Seal M13691 Type 21 1125 New Surplus
John Crane Mechanical Seal M13691 Type 21 1125 New Surplus
$30.00
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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