Mechanical Seal

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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
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
$18.53
quality
NEW FLOWSERVE PEERLESS PUMP SEAL MECHANISM GKB2135511B 13
NEW FLOWSERVE PEERLESS PUMP SEAL MECHANISM GKB2135511B 13
$750.00
quality
NIB AESSEAL Cartridge Mechanical Seal 1750 14
NIB AESSEAL Cartridge Mechanical Seal 1750 14
$279.00
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
JOHN CRANE PP046JH C BF5017118 8 T 21 125 MECHANICAL SEAL NIB
JOHN CRANE PP046JH C BF5017118 8 T 21 125 MECHANICAL SEAL NIB
$24.99
quality
Waterous Fire Pumps Special Repair Tools For Mechanical SealsPump Packing
Waterous Fire Pumps Special Repair Tools For Mechanical SealsPump Packing
$200.00
quality
NEW ROPLAN MECHANICAL SEAL KIT D446035
NEW ROPLAN MECHANICAL SEAL KIT D446035
$90.53
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
SMC NVZM450 N01 08 5 Port Mechanical Valve Metal Seal
SMC NVZM450 N01 08 5 Port Mechanical Valve Metal Seal
$40.99
quality
LOT 9 NEW TANIS FOOD TEC EC 0055 MECHANICAL SEAL RH SPRING D369753
LOT 9 NEW TANIS FOOD TEC EC 0055 MECHANICAL SEAL RH SPRING D369753
$10.33
quality
NEW NEWMAN 20 89V MECHANICAL SEAL RUBBER 3IN ID B274209
NEW NEWMAN 20 89V MECHANICAL SEAL RUBBER 3IN ID B274209
$11.53
quality
LOT 13 NEW TANIS FOOD TEC EC 0056 MECHANICAL SEAL LH SPRING D369764
LOT 13 NEW TANIS FOOD TEC EC 0056 MECHANICAL SEAL LH SPRING D369764
$10.53
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 1 RBA41663 TYPE 88 MECHANICAL 1 3 4IN STAINLESS PUMP SEAL B464187
NEW JOHN CRANE 1 RBA41663 TYPE 88 MECHANICAL 1 3 4IN STAINLESS PUMP SEAL B464187
$213.53
quality
FLOWSERVE 162030 MECHANICAL SEAL
FLOWSERVE 162030 MECHANICAL SEAL
$29.00
quality
NEW MB2 16 16mm Inner Diameter Single Coil Spring Bellows Mechanical Seal
NEW MB2 16 16mm Inner Diameter Single Coil Spring Bellows Mechanical Seal
$7.76
quality
NEW TOYO 7002008103894 MECHANICAL STAINLESS PUMP SEAL REPLACEMENT PART B487431
NEW TOYO 7002008103894 MECHANICAL STAINLESS PUMP SEAL REPLACEMENT PART B487431
$253.28
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
NEW EG  G Sealol Mechanical Rotary Seal  4060V WARRANTY
NEW EG G Sealol Mechanical Rotary Seal 4060V WARRANTY
$9.95
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
type 21 mechanical seal
type 21 mechanical seal
$10.50
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
15mm x 28mm x 35mm Mechanical Water Pump Shaft Seal Repair Parts
15mm x 28mm x 35mm Mechanical Water Pump Shaft Seal Repair Parts
$9.96
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
Mechanical 99 Single Slurry Pump Seal W Money Back Guarantee
Mechanical 99 Single Slurry Pump Seal W Money Back Guarantee
$200.00
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
NEW FLOWSERVE 113252 FGMS 2125IN MECHANICAL SEAL KIT REPLACEMENT PART B446933
NEW FLOWSERVE 113252 FGMS 2125IN MECHANICAL SEAL KIT REPLACEMENT PART B446933
$87.53
quality
VAUGHAN V801 305 CARTRIDGE STYLE MECHANICAL PUMP SEAL REPLACEMENT PART B463943
VAUGHAN V801 305 CARTRIDGE STYLE MECHANICAL PUMP SEAL REPLACEMENT PART B463943
$142.53
quality
NIB BURGMANN MG1S 25 Z MECHANICAL SEAL
NIB BURGMANN MG1S 25 Z MECHANICAL SEAL
$195.99
quality
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
$199.00
quality
Price Pump 8302 211 Mechanical seal NEW
Price Pump 8302 211 Mechanical seal NEW
$99.00
quality
EGG D 5424 MECHANICAL 1 3 8 IN SHAFT TUNGSTEN SEAL SINGLE BELLOWS PART B478962
EGG D 5424 MECHANICAL 1 3 8 IN SHAFT TUNGSTEN SEAL SINGLE BELLOWS PART B478962
$215.43
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
Bell  Gossett 118681 Mechanical Seal New
Bell Gossett 118681 Mechanical Seal New
$14.99
quality
John Crane B66429 Mechanical Seal Assembly 0750 New
John Crane B66429 Mechanical Seal Assembly 0750 New
$23.95
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
NEW ZENITH 12 BM900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417540
NEW ZENITH 12 BM900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417540
$68.53
quality
NEW ZENITH 12 BL900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417549
NEW ZENITH 12 BL900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417549
$73.53
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
MECHANICAL SEAL ASSEMBLY KIT 1 1 8 IN
MECHANICAL SEAL ASSEMBLY KIT 1 1 8 IN
$30.00
quality
NEW DUNHAM BUSH 21 028F 171 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417636
NEW DUNHAM BUSH 21 028F 171 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417636
$40.53
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
US Seal Mechanical Pump Seal PS 1677
US Seal Mechanical Pump Seal PS 1677
$319.00
quality
HOSHIZAKI 465627 01 Mechanical Seal
HOSHIZAKI 465627 01 Mechanical Seal
$37.61
quality
HOSHIZAKI SP8700029 Mechanical Seal 1
HOSHIZAKI SP8700029 Mechanical Seal 1
$117.67
quality
FITS VIKING MECHANICAL SEAL 2 477 015 999 00 BUNA AL4195 INDUSTRIAL
FITS VIKING MECHANICAL SEAL 2 477 015 999 00 BUNA AL4195 INDUSTRIAL
$60.00
quality
HOSHIZAKI 4A3820 01 Mechanical Seal
HOSHIZAKI 4A3820 01 Mechanical Seal
$37.12
quality
Zenith Mechanical Pump Seal part 18 79003 0056 1 187900300561
Zenith Mechanical Pump Seal part 18 79003 0056 1 187900300561
$90.00
quality
Chesterton 770 Mechanical Seal 74 02 006 NEW Surplus
Chesterton 770 Mechanical Seal 74 02 006 NEW Surplus
$35.00
quality
NEW 10 Pcs 14mm x 35mm x 7mm Mechanical Rubber O Ring Oil Seal Gaskets
NEW 10 Pcs 14mm x 35mm x 7mm Mechanical Rubber O Ring Oil Seal Gaskets
$7.57
quality
Mechanical Seal 95825 119 330502
Mechanical Seal 95825 119 330502
$49.99
quality
DURAMETALLIC MECHANICAL SEAL GEAX810351B
DURAMETALLIC MECHANICAL SEAL GEAX810351B
$50.00
quality
NEW BURKS 9762 MECHANICAL 5 8 IN ID PUMP SEAL REPLACEMENT PART B478969
NEW BURKS 9762 MECHANICAL 5 8 IN ID PUMP SEAL REPLACEMENT PART B478969
$19.53
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 JOHN CRANE 707218  500073 MECHANICAL SEAL 7 8
NEW JOHN CRANE 707218 500073 MECHANICAL SEAL 7 8
$75.00
quality
ZMT 648 150 40Q FACE MECHANICAL SEAL NEW
ZMT 648 150 40Q FACE MECHANICAL SEAL NEW
$25.00
quality
BROWN AND SHARP MECHANICAL SEAL FOR PUMPS 713 9517 270 NEW
BROWN AND SHARP MECHANICAL SEAL FOR PUMPS 713 9517 270 NEW
$20.03
quality
SEAL MECHANICAL PUMP ALLIS CHALMERS 52118510801
SEAL MECHANICAL PUMP ALLIS CHALMERS 52118510801
$114.99
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
MECHANICAL SEAL 25 12066
MECHANICAL SEAL 25 12066
$39.98
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
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
NEW CHESTERTON 442HP MECHANICAL SEAL REPAIR KIT SEAL SIZE 39 SHAFT SIZE 4875
NEW CHESTERTON 442HP MECHANICAL SEAL REPAIR KIT SEAL SIZE 39 SHAFT SIZE 4875
$299.00
quality
FLOWSERVE 4R6998SL Silicon Carbide Rotating Face Mechanical Seal
FLOWSERVE 4R6998SL Silicon Carbide Rotating Face Mechanical Seal
$399.95
quality
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
$1,516.00
quality
Mechanical Seal Spring Seal 14032698
Mechanical Seal Spring Seal 14032698
$27.50
quality
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
$60.00
quality
AESSEAL MECHANICAL SEAL SCUI 1750 C SC A2 NEW
AESSEAL MECHANICAL SEAL SCUI 1750 C SC A2 NEW
$342.07
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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