abc seal · eration of the abc seal. the purge gas must be maintained at a pressure of 0.02mpag...

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TANKEN SEAL(SHANGHAI) CO.,LTD.

RmA206,No2633 West YanAn Road,Shang-Mira　Commercial Centre ChangNing District,P.R.C. ZIP 200336TEL. (021)6210-1731　FAX. ( 021)6210-1751

ＣＫ-1033-EAIR BLOW CUT SEAL

ABC SEALABC SEAL

Service Network

JAPAN Headquarters & Tokyo Sales Office

3-14-15,Yaguchi, ota-ku, Tokyo 146-0093PHONE +81-3-3750-2151FAX +81-3-3750-5171E-MAIL [email protected]

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Vessel side

Atmospheric side

Purge Gas Pressure Vessel Pressure 0.02 0.03MPa Purge Gas

- - - - Seal Position Split pieces(ABC ring)

Garter Spring Side Spring

The ABC seal is a dry seal configured of spl i t r ings. I t is used in many devices_such as air blowers, centri-fuges, mixers and instruments han-dling powders - as a shaft seal unit.

The ABC seal is a floating type seal configured of split rings, fitted to the shaft using garter springs. The ABC seal follows the runout of the shaft. The typical configuration of an ABC seal is one that combines two sets of ABC rings to make a double seal. The barrier box between the ABC rings is pressurized to a pressure approxi-mately 0.02MpaG higher than the purge gas induced pressure inside the device. This pressure difference prevents flow material (fluid) leaking out of the vessel into the atmosphere.

1. Accommodates axial runoutThe ABC seal accommodates vessels with rough accuracy in areas such as axial runout and locomotion.

2.Maintenance freeThe ABC seal is maintenance free be-cause it has an automatic follow con-figuration that works even if it becomes worn.

3. Long lifespanThe ABC seal has an average lifespan of approximately five years, which means that it is effective in keeping run-ning costs low.

4. Replacement possible without dismantling deviceThe ABC seal is a split-ring type that can be replaced without dismantling the vessel.

Major devices fitted with ABC (Air Blow Cut) seals / Configuration and seal principle /

Features /

ABC rings

Rotary valve Blower

Mixer Diagonal-flow pump

Configuration Seal principle

Vessel side

Atmospheric side

Purge Gas Pressure Vessel Pressure 0.02 0.03MPa Purge Gas

- - - - Seal Position Split pieces(ABC ring)

Garter Spring Side Spring

The ABC seal is a dry seal configured of spl i t r ings. I t is used in many devices_such as air blowers, centri-fuges, mixers and instruments han-dling powders - as a shaft seal unit.

The ABC seal is a floating type seal configured of split rings, fitted to the shaft using garter springs. The ABC seal follows the runout of the shaft. The typical configuration of an ABC seal is one that combines two sets of ABC rings to make a double seal. The barrier box between the ABC rings is pressurized to a pressure approxi-mately 0.02MpaG higher than the purge gas induced pressure inside the device. This pressure difference prevents flow material (fluid) leaking out of the vessel into the atmosphere.

1. Accommodates axial runoutThe ABC seal accommodates vessels with rough accuracy in areas such as axial runout and locomotion.

2.Maintenance freeThe ABC seal is maintenance free be-cause it has an automatic follow con-figuration that works even if it becomes worn.

3. Long lifespanThe ABC seal has an average lifespan of approximately five years, which means that it is effective in keeping run-ning costs low.

4. Replacement possible without dismantling deviceThe ABC seal is a split-ring type that can be replaced without dismantling the vessel.

Major devices fitted with ABC (Air Blow Cut) seals / Configuration and seal principle /

Features /

ABC rings

Rotary valve Blower

Mixer Diagonal-flow pump

Configuration Seal principle

Note that in specifications where the ABC ring inner circumference is in contact with the shaft or sleeve, a hard coating is required, in order to reduce the wear of that surface.

The following are the three types of ABC rings.

The red line in the diagram above de-notes the gap between the ring and shaft. The smal ler the gap is the smaller the amount of purge gas needed.

The above device is a screw extruder. The photo of the vessel using gland packing reveals white powder scat-tered about the exter ior of the device. However, the photo after the conversion to ABC seal shows no white powder, which is an improve-ment to the work environment.

C ring R ring W ring

C ring ＋ R ring C ring ＋ C ring W ring ＋ R ring

Gland packing ABC seal

〈Before〉〈After〉

ABC ring materials / Cartridge type ABC seal unit /

ABC ring types and combinations /

【Combination of ABC rings / 】

Example of how a vessel can be modified from gland packing to ABC seal. /

Material /Glass Filled PTFECarbonOthers (graphite filled PTFE, etc.)

StandardFor high-speed applicationsSelect according to specifications

Application /

This ring has a small gap between the bore surface of the ring and the shaft.

This ring's bore surface is in contact with the shaft, but has gaps of approxi-mately 1mm at the split points.

This ring has an additional outer ring on the outside of the R-ring to enhance seal performance.

Standard specification For high-speed application For reducing purge gas

Note that in specifications where the ABC ring inner circumference is in contact with the shaft or sleeve, a hard coating is required, in order to reduce the wear of that surface.

The following are the three types of ABC rings.

The red line in the diagram above de-notes the gap between the ring and shaft. The smal ler the gap is the smaller the amount of purge gas needed.

The above device is a screw extruder. The photo of the vessel using gland packing reveals white powder scat-tered about the exter ior of the device. However, the photo after the conversion to ABC seal shows no white powder, which is an improve-ment to the work environment.

C ring R ring W ring

C ring ＋ R ring C ring ＋ C ring W ring ＋ R ring

Gland packing ABC seal

〈Before〉〈After〉

ABC ring materials / Cartridge type ABC seal unit /

ABC ring types and combinations /

【Combination of ABC rings / 】

Example of how a vessel can be modified from gland packing to ABC seal. /

Material /Glass Filled PTFECarbonOthers (graphite filled PTFE, etc.)

StandardFor high-speed applicationsSelect according to specifications

Application /

This ring has a small gap between the bore surface of the ring and the shaft.

This ring's bore surface is in contact with the shaft, but has gaps of approxi-mately 1mm at the split points.

This ring has an additional outer ring on the outside of the R-ring to enhance seal performance.

Standard specification For high-speed application For reducing purge gas

ABC Seal Box

Divided Bushing ABC Seal

Blow gas Purge gas

The size of the arrow shows flowing quantity.

Press. gauge

Flow meter

ABC Seal

Air filter & Regulator

Purge gas

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Purge gas pressure must be con-trolled properly to ensure correct op-eration of the ABC seal. The purge gas must be maintained at a pressure of 0.02MpaG greater than the pres-sure inside the vessel. If purge gas pressure drops below that of the pres-sure inside the vessel, the powder and gas in the vessel will leak out.

When the vessel in question is han-dling a molten fluid, there are times when blowing off is not possible with the ABC ring's purge gas. In such cases, instal l divided bushing, as shown below, to close off the contents inside the device, and increase purge gas flow speed, to enable a forceful blow.

Pressure relationVessel pressure ＜ Blow gas pressure ＜ Purge gas pressure

【Track record by device】

【Track record by fluid】

Vessel types Applicable device names

Handled fluid Diagram numberApplicable device

Centrifuge (case seal)Centrifuge (pipe seal)

T2-07349T3-30971T2-05503T2-08323T3-31007T3-26304T3-26305T2-06525T2-07202T2-07368T2-04312T2-07367T3-28250T3-16926T3-31001T3-28816T3-25427T3-30371T3-36649T2-07403T3-21558T3-27636

T3-21734T3-25986T2-07368T2-05750T3-17354T2-04233T3-16232T3-16926T4-05107T3-17828T3-16226T3-21322T3-08831T3-23733T3-28250T3-25858T3-23100T3-25189T3-26304T3-19897T3-10950T2-05980T3-28261T3-23856

ExtruderTwin screw extruderGlass lined vessel mixerNauta mixer (bottom seal)Nauta mixer (side chopper)Side-type mixerUpright-type mixer

Representative diagram numbers

Centrifuge

DrierUpright-type drier (shaft movement possible)Kneader

Screw conveyor (horizontal type)Screw conveyor (inclined)

Conveyor

Horizontal shaft type mixed flow pump (negative pressure seal section)Cooling water pump

Kneader

BlowerBlowerScrew compressorCompressorExpanderExpanderGrinder millGrinder millRotary valveRotary valveFermenterFermenter

Paddle conveyorABS resin powderBlowerCDQ circulation gasDrierPC powderTwin screw extruderPE powderTwin screw inclined conveyorPMA powderRibbon type mixerPPS resin powderGranulatorInk raw material powderInclined screw conveyorActivated white earthDrierLiquid brown sugarMixerN2 gas containing silica dustRotary valve

Rotary valve

Lime powder

Screw conveyorTonerScrew feederToner (containing 50 to 60% water)Inclined screw conveyorPowdered coalCentrifugeFlux containing medication powderNauto mixer (washing process)CosmeticScrew conveyorChinese herbal medicine powderDrierCrystal glucose powderFermenter mixerAlcohol mistClumped powder millWheat flourRibbon type mixerPowdered milk

Rosh mill Cement powderMixer

Starch powder (containing 12% water)Dye intermediate powder

Extruder

Purge gas control /

【Option】 Blow system for molten fluid /