Mechanical Seal

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CARVER MECHANICAL SEAL GLAND 316 STAINLESS STEEL
CARVER MECHANICAL SEAL GLAND 316 STAINLESS STEEL
$175.00
quality
John Crane Mechanical Seal 807074 12 Seal Assy No D 2125 771 Model 6LRN 13 NOS
John Crane Mechanical Seal 807074 12 Seal Assy No D 2125 771 Model 6LRN 13 NOS
$59.99
quality
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
$1,365.00
quality
Flex A Seal FL 145M Mechanical Seal
Flex A Seal FL 145M Mechanical Seal
$55.00
quality
NEW 609SVC P 26 1 5 8IN MECHANICAL SEAL ASSEMBLY D398912
NEW 609SVC P 26 1 5 8IN MECHANICAL SEAL ASSEMBLY D398912
$234.00
quality
EG  G SEALOL MECHANICAL SEAL 1500  SHAFT SIZE NEW  OLD STOCK
EG G SEALOL MECHANICAL SEAL 1500 SHAFT SIZE NEW OLD STOCK
$130.00
quality
ABS MECHANICAL SEAL PART  11100029 NEW  OLD STOCK
ABS MECHANICAL SEAL PART 11100029 NEW OLD STOCK
$120.00
quality
Mechanical seal RO 2 1 8 inch Dura Seal Durametallic
Mechanical seal RO 2 1 8 inch Dura Seal Durametallic
$250.00
quality
Mechanical seal RO 1875 in 52845 Dura Seal Durametallic
Mechanical seal RO 1875 in 52845 Dura Seal Durametallic
$185.00
quality
Mechanical seal RO 2125 in 88320 Dura Seal Durametallic
Mechanical seal RO 2125 in 88320 Dura Seal Durametallic
$225.00
quality
Mechanical seal PBR bellows 96831 175 in shaft Dura Seal Durametallic Unused
Mechanical seal PBR bellows 96831 175 in shaft Dura Seal Durametallic Unused
$550.00
quality
Mechanical seal RO B M 94708 1 3 8 in Dura Seal Durametallic Unused
Mechanical seal RO B M 94708 1 3 8 in Dura Seal Durametallic Unused
$225.00
quality
Mechanical seal RA B M 61484 1 1 8 in Dura Seal Durametallic Unused
Mechanical seal RA B M 61484 1 1 8 in Dura Seal Durametallic Unused
$175.00
quality
Mechanical seal RO B M 90992 1 5 8 in Dura Seal Durametallic Unused
Mechanical seal RO B M 90992 1 5 8 in Dura Seal Durametallic Unused
$155.00
quality
Mechanical seal and gland RO B M 72929 1 3 4 in Dura Seal Durametallic
Mechanical seal and gland RO B M 72929 1 3 4 in Dura Seal Durametallic
$325.00
quality
Mechanical seal Double RO 25 in 66556 Dura Seal Durametallic Unused
Mechanical seal Double RO 25 in 66556 Dura Seal Durametallic Unused
$350.00
quality
NEW 6886795 1802ATY210RM075 1 R 2 MECHANICAL SEAL ASSEMBLY D398995
NEW 6886795 1802ATY210RM075 1 R 2 MECHANICAL SEAL ASSEMBLY D398995
$23.00
quality
Double Mechanical Seal
Double Mechanical Seal
$25.00
quality
New armstrong mechanical seal 81670021 for s 25 s 57 h 32 h 54 bell gosett 60 14
New armstrong mechanical seal 81670021 for s 25 s 57 h 32 h 54 bell gosett 60 14
$24.99
quality
JOHN CRANE 575880 1 3 8IN MECHANICAL SEALOL SEAL STAINLESS REPLACEMENT B256011
JOHN CRANE 575880 1 3 8IN MECHANICAL SEALOL SEAL STAINLESS REPLACEMENT B256011
$195.00
quality
JOHN CRANE M110175 TYPE 680 2165IN MECHANICAL SEAL REPLACEMENT PART B255923
JOHN CRANE M110175 TYPE 680 2165IN MECHANICAL SEAL REPLACEMENT PART B255923
$50.00
quality
Blackmer Power Pumps Replacement Mechanical Seal 331830 NNB
Blackmer Power Pumps Replacement Mechanical Seal 331830 NNB
$89.99
quality
NEW JOHN CRANE 1 MECHANICAL SEAL ASSEMBLY 0254 A L63687
NEW JOHN CRANE 1 MECHANICAL SEAL ASSEMBLY 0254 A L63687
$74.99
quality
FLINT  WALLING 136682 Mechanical SealVitonDia 5 8 In
FLINT WALLING 136682 Mechanical SealVitonDia 5 8 In
$43.16
quality
FlowServe 550 mechanical split seal 1360593 Dura Seal PSS Type 37FS 162774
FlowServe 550 mechanical split seal 1360593 Dura Seal PSS Type 37FS 162774
$328.00
quality
2X NEW CHESTERTON 166048 MECHANICAL SEAL SPLIT RING 442 40 EXP RING 316 SS 86174
2X NEW CHESTERTON 166048 MECHANICAL SEAL SPLIT RING 442 40 EXP RING 316 SS 86174
$39.99
quality
John Crane Inc D 1250 341 3892 Bellows Buna N Mechanical Seal T 1B Lot of 4
John Crane Inc D 1250 341 3892 Bellows Buna N Mechanical Seal T 1B Lot of 4
$99.00
quality
John Crane Inc IT32 Mechanical Seal 1 1 8DIA Rubber Gasket SS Body Type 1
John Crane Inc IT32 Mechanical Seal 1 1 8DIA Rubber Gasket SS Body Type 1
$60.00
quality
John Crane Inc B021 42 Mechanical Seal 1 5 8 DIA Rubber Gasket SS Body Type 9
John Crane Inc B021 42 Mechanical Seal 1 5 8 DIA Rubber Gasket SS Body Type 9
$275.00
quality
John Crane Inc B384 22 Mechanical Seal 1 1 8DIA Rubber Gasket SS Body Type 9T
John Crane Inc B384 22 Mechanical Seal 1 1 8DIA Rubber Gasket SS Body Type 9T
$130.00
quality
John Crane Inc B199 03 Mechanical Seal 2 1 4 DIA Rubber Gasket SS Body Type 1
John Crane Inc B199 03 Mechanical Seal 2 1 4 DIA Rubber Gasket SS Body Type 1
$425.00
quality
John Crane Inc IT23 24 Mechanical Seal 2 1 4DIA Rubber Gasket SS Body Type 9
John Crane Inc IT23 24 Mechanical Seal 2 1 4DIA Rubber Gasket SS Body Type 9
$265.00
quality
Mechanical seal 1 1 4 ID 2 OD Viton Shaft Seal
Mechanical seal 1 1 4 ID 2 OD Viton Shaft Seal
$20.00
quality
NEW Pac Seal 21 125 04 mechanical pump shaft seal
NEW Pac Seal 21 125 04 mechanical pump shaft seal
$19.95
quality
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
$32.99
quality
New Goulds Mechanical Seal Assembly 10K95
New Goulds Mechanical Seal Assembly 10K95
$75.60
quality
Dura Seal Mechanical Seal P 50 2 1 8 Input Bore p n GEB2848692A
Dura Seal Mechanical Seal P 50 2 1 8 Input Bore p n GEB2848692A
$225.00
quality
Welch 1397 DuoSeal Belt Drive Rotary Vane Mechanical Vacuum Pump DUO SEAL
Welch 1397 DuoSeal Belt Drive Rotary Vane Mechanical Vacuum Pump DUO SEAL
$989.00
quality
Mechanical Seal kit 136 64 ST Ring 23mm C14 4002 03 136 31 RotSIC Size 1
Mechanical Seal kit 136 64 ST Ring 23mm C14 4002 03 136 31 RotSIC Size 1
$50.00
quality
John Crane Mechanical Seal B31457 10 inch assembly mating ring for Gould 3933
John Crane Mechanical Seal B31457 10 inch assembly mating ring for Gould 3933
$99.00
quality
DELTA MECHANICAL SEAL AV30001125A SHAFT SIZE 1125
DELTA MECHANICAL SEAL AV30001125A SHAFT SIZE 1125
$69.99
quality
CHESTERTON MECHANICAL SEAL 180A R 2375 SHAFT SIZE
CHESTERTON MECHANICAL SEAL 180A R 2375 SHAFT SIZE
$99.99
quality
NEW JOHN CRANE QP 1 MECHANICAL SEAL 1250IN D414910
NEW JOHN CRANE QP 1 MECHANICAL SEAL 1250IN D414910
$32.00
quality
FLOWSERVE GEB3778462A 4 DURA SEAL MECHANICAL PUMP 2 1 4IN GLAND SEAL B256534
FLOWSERVE GEB3778462A 4 DURA SEAL MECHANICAL PUMP 2 1 4IN GLAND SEAL B256534
$251.00
quality
CHESTERTON TYPE 123 MECHANICAL 1 3 4IN 32MM SEAL ASSEMBLY STAINLESS PART B255890
CHESTERTON TYPE 123 MECHANICAL 1 3 4IN 32MM SEAL ASSEMBLY STAINLESS PART B255890
$157.00
quality
Multiquip Trash Pump Mechanical Seal Fits QP3TH QP2TH
Multiquip Trash Pump Mechanical Seal Fits QP3TH QP2TH
$148.98
quality
New John Crane Mechanical Seal IS20 2F 8C 3750 type1 b205 39 BF5017118 8
New John Crane Mechanical Seal IS20 2F 8C 3750 type1 b205 39 BF5017118 8
$1,199.00
quality
NEW JOHN CRANE PO2886 MECHANICAL PUMP SEAL REPLACEMENT PART D382419
NEW JOHN CRANE PO2886 MECHANICAL PUMP SEAL REPLACEMENT PART D382419
$33.00
quality
NEW EAGLE BURGMANN CARTEX DN20 E2 MECHANICAL SEAL ASSEMBLY V16MG BQ1V16MG
NEW EAGLE BURGMANN CARTEX DN20 E2 MECHANICAL SEAL ASSEMBLY V16MG BQ1V16MG
$539.99
quality
NEW EAGLE BURGMANN CARTEX DN 20 E2 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
NEW EAGLE BURGMANN CARTEX DN 20 E2 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
$969.99
quality
FLOWSERVE 387882 MECHANICAL 2 1 4IN SHAFT APT32 4 PUMP SEAL STAINLESS B241513
FLOWSERVE 387882 MECHANICAL 2 1 4IN SHAFT APT32 4 PUMP SEAL STAINLESS B241513
$450.00
quality
Pac Seal Type 16 Pump Shaft Mechanical Seal
Pac Seal Type 16 Pump Shaft Mechanical Seal
$8.00
quality
NEW Durametallic Duraseal Mechanical Seal 5750 Single Inside PTO NEW
NEW Durametallic Duraseal Mechanical Seal 5750 Single Inside PTO NEW
$99.99
quality
Armstrong 1 3 8 X 3 4 Mechanical Seal Kit 816707 001 for on a 6 Series Pump
Armstrong 1 3 8 X 3 4 Mechanical Seal Kit 816707 001 for on a 6 Series Pump
$69.99
quality
GOULDS PUMPS 10K94 Mechanical Seal
GOULDS PUMPS 10K94 Mechanical Seal
$165.88
quality
GARLOCK MECHANICAL SEAL 1 13 16 71516 7850 VITON CRB NIR
GARLOCK MECHANICAL SEAL 1 13 16 71516 7850 VITON CRB NIR
$59.00
quality
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
$9.99
quality
John Crane Cartridge 25 Mechanical Seal Assembly Metal Bellows 316 C276 Viton
John Crane Cartridge 25 Mechanical Seal Assembly Metal Bellows 316 C276 Viton
$399.00
quality
NEW JOHN CRANE FSP 15004 MECHANICAL SEAL 0875IN D414644
NEW JOHN CRANE FSP 15004 MECHANICAL SEAL 0875IN D414644
$77.00
quality
Flowserve Mechanical Seal 1875 Part85 15AVP SilCar vs SilCar Viton Elastomers
Flowserve Mechanical Seal 1875 Part85 15AVP SilCar vs SilCar Viton Elastomers
$500.00
quality
JOHN CRANE 704355 EZ 1 1 1 2IN SHAFT MECHANICAL PUMP SEAL REPLACEMENT B295557
JOHN CRANE 704355 EZ 1 1 1 2IN SHAFT MECHANICAL PUMP SEAL REPLACEMENT B295557
$500.00
quality
John Crane 40 mechanical seal T8B1 32A 8B1 part  B91244
John Crane 40 mechanical seal T8B1 32A 8B1 part B91244
$458.00
quality
JOHN CRANE X05810151 TYPE 8 1 JOINT MECHANICAL CARTRIDGE SEAL STAINLESS B241827
JOHN CRANE X05810151 TYPE 8 1 JOINT MECHANICAL CARTRIDGE SEAL STAINLESS B241827
$450.00
quality
FlowServe 550 split mechanical seal 1360593 assembly 162774
FlowServe 550 split mechanical seal 1360593 assembly 162774
$425.00
quality
Goulds 3196 MTX Large Bore Mechanical Seal Gland 316 Stainless
Goulds 3196 MTX Large Bore Mechanical Seal Gland 316 Stainless
$125.00
quality
3437 SEALOL 670 LHT SBF 217 60 mechanical seal 670LHTSBF21760 0986984
3437 SEALOL 670 LHT SBF 217 60 mechanical seal 670LHTSBF21760 0986984
$150.00
quality
SCOT DIVISION MECHANICAL PUMP SEAL P N 101000120 SHAFT SIZE 5 8 AB3
SCOT DIVISION MECHANICAL PUMP SEAL P N 101000120 SHAFT SIZE 5 8 AB3
$30.00
quality
GOULDS PUMPS 10K100 Mechanical Seal
GOULDS PUMPS 10K100 Mechanical Seal
$225.88
quality
SEAL MECHANICAL VITON INTERVAC VACUUM PUMP 950075SAC915
SEAL MECHANICAL VITON INTERVAC VACUUM PUMP 950075SAC915
$218.88
quality
NEW BURKS 21942 P 1 1 8 IN MECHANICAL STAINLESS PUMP SEAL D415567
NEW BURKS 21942 P 1 1 8 IN MECHANICAL STAINLESS PUMP SEAL D415567
$38.00
quality
NEW JOHN CRANE P 2143 PUMP SEAL MECHANICAL O RING B296141
NEW JOHN CRANE P 2143 PUMP SEAL MECHANICAL O RING B296141
$20.00
quality
Flowserve Fybroc 1375 MECHANICAL SEAL 96940M Assembly NEW
Flowserve Fybroc 1375 MECHANICAL SEAL 96940M Assembly NEW
$92.65
quality
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
$17.99
quality
Chesterton 714 Ceramic Mechanical Pump SEAL 059651 size 36 shaft 4500 NEW NIB
Chesterton 714 Ceramic Mechanical Pump SEAL 059651 size 36 shaft 4500 NEW NIB
$17.99
quality
NEW GARLOCK PK MECHANICAL SEAL 1 5 8 SHAFT 70005 0021 BRASS NITRILE CERAMIC
NEW GARLOCK PK MECHANICAL SEAL 1 5 8 SHAFT 70005 0021 BRASS NITRILE CERAMIC
$25.00
quality
Travaini Pump Mechanical Seal P N 95B055BCC96H NIB
Travaini Pump Mechanical Seal P N 95B055BCC96H NIB
$75.00
quality
Travaini Pump Mechanical Seal P N 95B035FMA92K NEW ROTEN Uniten 4K 35
Travaini Pump Mechanical Seal P N 95B035FMA92K NEW ROTEN Uniten 4K 35
$36.75
quality
PACO Pump Mechanical Seal 14032701
PACO Pump Mechanical Seal 14032701
$80.00
quality
Burgmann Mechanical Seal 14032693 175 Shaft
Burgmann Mechanical Seal 14032693 175 Shaft
$40.00
quality
Pump Mechanical Seal  96690109 For 2000 Shaft
Pump Mechanical Seal 96690109 For 2000 Shaft
$40.00
quality
PACO Pump Mechanical Seal
PACO Pump Mechanical Seal
$40.00
quality
John Crane 812255 48N2 Split mechanical seal 30 type 3710 24A 300 inch
John Crane 812255 48N2 Split mechanical seal 30 type 3710 24A 300 inch
$320.00
quality
New Chesterton 770 Mechanical Seal 770 13 1 5 8 2 770 12 Seals
New Chesterton 770 Mechanical Seal 770 13 1 5 8 2 770 12 Seals
$67.50
quality
NEW ROTH PUMP B15611VA F8E001VF MECHANICAL PUMP SEAL REPLACEMENT PART D365985
NEW ROTH PUMP B15611VA F8E001VF MECHANICAL PUMP SEAL REPLACEMENT PART D365985
$80.00
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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