Supported Shaft

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Types of Shaft Seals and Choosing the Right Shaft Seal for an Application

Shaft seals or oil seals are common mechanical components found in various processing applications. A shaft seal can generally be found in any application that requires a rotary element, such as a turning shaft or rotating bore. The primary function of a shaft seal is to block leakage of the process fluids along the rotating shaft and prevent ingress of external contaminants into the shaft housing. Shaft seals are fitted against cylindrical shaft surfaces to keep the leakage of process fluid to an acceptable minimum under all instances of operation.

Mechanical shaft seals consist of stationary and rotating parts. The stationary part comprises of a primary as well as a secondary seal, while the rotating part consists of a seal face, a secondary seal, a spring, a spring retainer, and a seal driver fitted with a retaining ring. Proper functioning of mechanical shaft seals depends on all of these crucial components.

Rotating shaft seals can be categorized into fixed clearance and surface-guided types.

Fixed Clearance Seals

* Visco Seal

* Bushing Seal

* Ferrofluid Seal

* Floating Ring Seal

* Labyrinth Seal

Surface Guided Seals

* Cylindrical Surface (Packing, Circumferential Seal, Lip Seal)

* Annular Surface Seals (Mechanical Face Seal, Lip Seal)

Fixed Clearance Seals

In fixed clearance seals, the seal faces never come into contact with the shaft surface. Common types of non-contacting seals include ferrofluid seals, visco seals, and labyrinth seals.

Visco Seals

In a visco seal, the process fluid itself facilitates the sealing action. In the event that the process fluid is a gas, a separate liquid is supplied for sealing action. The sealing efficiency of a visco seal depends on the viscosity and clearance of the liquid that is sealed or the separate supply liquid used.

Labyrinth Seals

The static portion of this seal is composed of many fins that slow fluid leakage. Labyrinth seals take up a wider space on the axial shaft compared to other shaft seal types. These seals can be used in process applications involving gases as well as liquids. Labyrinth seals have found application in a range of gas turbine engines and pistons. The high loss leakage design of labyrinth seals is critical to the effectiveness of the seal.

Bushing Seals

In a bushing seal, an annulus is formed between the shaft and bushing clearance. The length of the annulus and clearance determines the fluid flow resistance of the seal. Typically, the clearance should be large enough to facilitate all shaft motion.

Floating Ring Seals

Floating ring seals are similar to bushing seals. However, the bushings in floating seals float freely to allow for large radial shaft motion. Hence, these seals have smaller clearance than fixed bushing seals.

Ferrofluid Seals

These seals use magnets between the shaft and seal surfaces, with additional magnetic fluid also introduced between them. Ferrofluid seals can handle significant pressure differentials and are best suited for applications that warrant zero leakage.

Surface Guided Seals

In surface guided seals, the seal segments are fitted against the rotating shafts or bores, hence the name. Almost all surface guided shaft seals come into contact with either a cylindrical or an annular surface.

Cylindrical Surface Seals

Lip Seals

These seals consist of stacked layers of lip seals that delay fluid leakage. The seal segments of the lip seals make contact with a small axial region. Lip seals are not suited for applications involving fine particles and abrasive process materials. As additional options, inert gas or air is introduced to protect lip seals from process materials during operation.

Circumferential Seals

Unlike lip seals, circumferential seals make contact with cylindrical surfaces over a significant axial length. Some seal segments of these seals clamp around the entire cylindrical surface.

Packing Seals

These seals come into contact with a large area of the cylindrical shaft surface. Packing shaft seals are available in many packaging styles, including PTFE-based braiding, ex-foliated graphite yarns, and graphite braided with metal filaments or synthetic fibers. These shaft seals are best suited for sealing applications that warrant resistance to abrasion, thermal extrusion, high temperature, and thermal degradation.

Annular Surface Seals

Lip Seals

These seals are designed to contact a small section of the annulus surface. Lip seals are also available in cylindrical surface contact configurations.

Mechanical Face Seals

Mechanical face seals, also known as radial face seals or end face seals, contact a large radial length of the annular surface. Unlike cylindrical contact mechanical face seals, radial face seals do not have separate segments.

Selection of Shaft Seals

Shaft seals are used in almost all rotating shafts that pass through multiple fluid media. Pumps, compressors, bearings, and powered vessels are some common mechanical equipment that utilize rotating shaft seals. They are also extensively used in industrial process environments where sealing of abrasive materials, high-temperature air, and corrosive fumes are required. Major industrial sectors that use shaft seals include aerospace, power generation, agriculture, and process industries.

Selection of proper shaft seals is of prime importance in processing industries, because shaft seal failure causes errant problems such as material loss, oil spills, and equipment damage. Several factors influence the selection of appropriate shaft seals for specific applications:

* The fluid that needs to be sealed

* The properties of fluid

* The thermal, chemical, and mechanical impact of process fluid on the seal

* The amount of pressure the selected shaft seal can handle

* The wear rate of selected shaft seals

* The rapid flow resistance of selected shaft seals

To locate a supplier of shaft seals, including lip, face, and oil seals, please check Zycon.com for a comprehensive list of
shaft seal manufacturers
.

Discover Supported Shaft On eBay Below:

Applied Materials AMAT 0200 35009 0200 35009SHAFTSUSCEPTOR SUPPORT
Applied Materials AMAT 0200 35009 0200 35009SHAFTSUSCEPTOR SUPPORT
$1,500.00
Lam Research LAM 13 1000 020 ONTRAK SHAFT BRUSH SUPPORT
Lam Research LAM 13 1000 020 ONTRAK SHAFT BRUSH SUPPORT
$435.00
Di Acro Box Pan Finger Brake Cam Shaft Bearing Support Arm 12 24 36 Diacro Parts
Di Acro Box Pan Finger Brake Cam Shaft Bearing Support Arm 12 24 36 Diacro Parts
$115.00
Di Acro Box Pan Finger Brake Cam Shaft Bearing Support 12 24 36 Diacro Parts
Di Acro Box Pan Finger Brake Cam Shaft Bearing Support 12 24 36 Diacro Parts
$115.00
GL AUTOMATION INC AWA 8 13 Support Roller with Shaft not in original packaging
GL AUTOMATION INC AWA 8 13 Support Roller with Shaft not in original packaging
$20.00
Applied Materials 0200 35208 SHAFT SUSCEPTOR SUPPORT POLY BCCD R3 ROT
Applied Materials 0200 35208 SHAFT SUSCEPTOR SUPPORT POLY BCCD R3 ROT
$3,250.00
CNC Supported Shaft 20mm 55 an 2 Bearing Special 99
CNC Supported Shaft 20mm 55 an 2 Bearing Special 99
$99.00
SK12 Bracket 12mm Linear Rail Shaft Rod Support CNC  3D Printer SH12A
SK12 Bracket 12mm Linear Rail Shaft Rod Support CNC 3D Printer SH12A
$4.85
SHF12 Bracket 12mm Linear Rail Shaft Rod Support CNC  3D Printer
SHF12 Bracket 12mm Linear Rail Shaft Rod Support CNC 3D Printer
$5.04
Lam Research OnTrak 714 012860 002 Support Shaft Front New
Lam Research OnTrak 714 012860 002 Support Shaft Front New
$796.00
T 1560 GM Output Shaft Support  Holding Fixture 700R4
T 1560 GM Output Shaft Support Holding Fixture 700R4
$120.95
monarch 10 EE tachometer gear support with shaft and gears
monarch 10 EE tachometer gear support with shaft and gears
$100.00
2Pcs SK16 16mm Linear Rail Shaft Guide Support CNC
2Pcs SK16 16mm Linear Rail Shaft Guide Support CNC
$8.44
CNC Flange Block 16mm Diameter Aluminium Shaft Support
CNC Flange Block 16mm Diameter Aluminium Shaft Support
$15.90
CR BEARING HB88107 A TIMKEN CARRIER BEARING DRIVE SHAFT SUPPORT GM TRUCKS NOS
CR BEARING HB88107 A TIMKEN CARRIER BEARING DRIVE SHAFT SUPPORT GM TRUCKS NOS
$25.99
Accu Cut SK209F1005 Support Center Shaft
Accu Cut SK209F1005 Support Center Shaft
$128.50
SK10 Bracket 10mm Linear Rail Shaft Rod Support CNC  3D Printer SH10A
SK10 Bracket 10mm Linear Rail Shaft Rod Support CNC 3D Printer SH10A
$4.85
SHF8 Bracket 8mm Linear Rail Shaft Rod Support CNC  3D Printer
SHF8 Bracket 8mm Linear Rail Shaft Rod Support CNC 3D Printer
$6.32
NEW ASM PN 16 321752C01 Quartz Shaft For Enclosed Support
NEW ASM PN 16 321752C01 Quartz Shaft For Enclosed Support
$161.52
CNC Flange Block 12mm Diameter Aluminium Shaft Support
CNC Flange Block 12mm Diameter Aluminium Shaft Support
$12.95
Shaft Support Pillow Block   1 shaft  Aluminum 2 Pcs
Shaft Support Pillow Block 1 shaft Aluminum 2 Pcs
$44.56
CNC Router Linear WH8A 1 2inch Shaft Support Supporter
CNC Router Linear WH8A 1 2inch Shaft Support Supporter
$17.90
1x Amada Spring Support Shaft Replacement 36108921 51111120A NOS
1x Amada Spring Support Shaft Replacement 36108921 51111120A NOS
$14.99
12mm CNC Flanged Shaft Support Supporter Block
12mm CNC Flanged Shaft Support Supporter Block
$14.90
Motor Shaft ER20 Collet Chuck 16mm Extension Rod Support Tool Holder Milling CNC
Motor Shaft ER20 Collet Chuck 16mm Extension Rod Support Tool Holder Milling CNC
$11.00
2 PCS automatic threading drive shaft support FOR Tajima and China embroidery
2 PCS automatic threading drive shaft support FOR Tajima and China embroidery
$7.19
Motor Shaft ER20 Collet Chuck 16mm Extension Rod Support Tool Holder Milling CNC
Motor Shaft ER20 Collet Chuck 16mm Extension Rod Support Tool Holder Milling CNC
$12.99
15pcs 400mm Optical Axis Guide Bearing Housings Linear Rail Shaft Support Screws
15pcs 400mm Optical Axis Guide Bearing Housings Linear Rail Shaft Support Screws
$19.99
CNC Flange Block 25mm Diameter Aluminium Shaft Support
CNC Flange Block 25mm Diameter Aluminium Shaft Support
$17.95
10mm 25 64 Diameter Aluminum Motor CNC Linear Rail Shaft Guide Support
10mm 25 64 Diameter Aluminum Motor CNC Linear Rail Shaft Guide Support
$8.69
Applied Materials 0200 35089W Shaft Susceptor Support	AMAT AKA 0200 35425
Applied Materials 0200 35089W Shaft Susceptor Support AMAT AKA 0200 35425
$1,995.00
Shaft Assembly Support Spool MLR 180572 Miller 180572
Shaft Assembly Support Spool MLR 180572 Miller 180572
$29.99
16mm 5 8 Diameter Aluminum Motor CNC Linear Rail Shaft Guide Support
16mm 5 8 Diameter Aluminum Motor CNC Linear Rail Shaft Guide Support
$8.75
AMAT 0020 70076 SUPPORT GUIDE SHAFT 29 POSN STOR ELEV
AMAT 0020 70076 SUPPORT GUIDE SHAFT 29 POSN STOR ELEV
$500.00
SK8 Bracket 8mm Linear Rail Shaft Rod Support CNC  3D Printer
SK8 Bracket 8mm Linear Rail Shaft Rod Support CNC 3D Printer
$5.04
SHF10 Bracket 10mm Linear Rail Shaft Rod Support CNC  3D Printer
SHF10 Bracket 10mm Linear Rail Shaft Rod Support CNC 3D Printer
$6.06
SHF6 Bracket 6mm Linear Rail Shaft Rod Support CNC  3D Printer
SHF6 Bracket 6mm Linear Rail Shaft Rod Support CNC 3D Printer
$6.32
SK6 Bracket 6mm Linear Rail Shaft Rod Support CNC  3D Printer
SK6 Bracket 6mm Linear Rail Shaft Rod Support CNC 3D Printer
$5.74
Item 1888 One 1 used Farrel Door Support for 11D Mixer includes door shaft
Item 1888 One 1 used Farrel Door Support for 11D Mixer includes door shaft
$5,625.00

Recently Purchased Supported Shaft:


monarch 10 ee tachometer gear support with shaft and gears, 3 x t8 1000mm stainl steel lead screw with shaft coupling and mounting support, shaft assembly support spool mlr 180572 miller 180572, applied materials 020035089w shaft susceptor support amat aka 020035425, 15pcs 400mm optical axis guide bearing housings linear rail shaft support screws, diacro box pan finger brake cam shaft bearing support 12 24 36 diacro parts, diacro box pan finger brake cam shaft bearing support arm 12 24 36 diacro parts, pacific bearing ccr1609 1 x 9 integrated feather shafting w support rail, amat 002070076 support guide shaft 29 posn stor elev, martin 2 shaft screw conveyor support bracket lot of 2, cnc supported shaft 20mm 55 an 2 bearing special $99, cnc supported shaft 20mm 30 an 2 bearing special $79, t8 1000mm stainless steel lead screw with shaft coupling and mounting support, 1x amada spring support shaft replacement 36108921 51111120a nos, one amada spherical shaft support nb6 a019580801 new old stock, item 1888 one 1 used farrel door support for 11d mixer includes door shaft, 2 pcs automatic threading drive shaft support for tajima and china embroidery , new asm pn 16321752c01 quartz shaftfor enclosed support, aixtron 100051733 support shaft lift pin ring htr drive 4992100 rev1 genus, motor shaft er20 collet chuck 16mm extension rod support tool holder milling cnc, t1560 gm output shaft support amp; holding fixture 700r4, lam research ontrak 714012860002 support shaft front new, cr bearing hb88107a timken carrier bearing drive shaft support gm trucks nos, gl automation inc awa813 support roller with shaftnot in original packaging, lam research lam 131000020 ontrak shaft brush support, applied materials amat 020035009 020035009shaftsusceptor support, applied materials amat 001500089 support shaft lower modified, screen 006b44741 shaft holder support, misumi compact shaft support 10mm lot of 6 shmwm1010 new, shaft support pillow block 1 shaft aluminum 2 pcs, 5 cnc 12 drive shaft support bearings r8zz shielded premium bearing abec3, applied materials 020035208 shaft susceptor support polybccd r3 rot, shf12 bracket 12mm linear rail shaft rod support cnc amp; 3d printer , sk12 bracket 12mm linear rail shaft rod support cnc amp; 3d printer sh12a, 2pcs sk16 16mm linear rail shaft guide support cnc, amat 020035208 susceptor support shaft polybccd 412758, shf10 bracket 10mm linear rail shaft rod support cnc amp; 3d printer , sk6 bracket 6mm linear rail shaft rod support cnc amp; 3d printer, shf6 bracket 6mm linear rail shaft rod support cnc amp; 3d printer , shf8 bracket 8mm linear rail shaft rod support cnc amp; 3d printer , sk10 bracket 10mm linear rail shaft rod support cnc amp; 3d printer sh10a, sk8 bracket 8mm linear rail shaft rod support cnc amp; 3d printer, hd steel shaft support block l8, 16mm 58 diameter aluminum motor cnc linear rail shaft guide support, 10mm 2564 diameter aluminum motor cnc linear rail shaft guide support, accucut sk209f1005 support center shaft, cnc flange block 25mm diameter aluminium shaft support, 12mm cnc flanged shaft supportsupporter block, cnc router linear wh8a 12inch shaft supportsupporter, cnc flange block 12mm diameter aluminium shaft support, cnc flange block 16mm diameter aluminium shaft support