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Hydraulic seals

Hydraulic drives are used in many machines and systems due to the wide range of possible applications in mechanization and automation. The most important component for generating the linear drive movement is the hydraulic cylinder. The function and operational reliability of hydraulically driven machines depend largely on the seals used in the hydraulic cylinder.

In addition to our commercial range, which ensures a high level of quality, we offer you products from the world market leader Freudenberg, which are available as high-quality sealing elements in designs for OEM areas.

Common materials:

PTFE, NBR, FKM, POM, PEEK, EPDM, VMQ, BR, IIR, IR, AU, EU, NR, HNBR, FFKM, FVMQ, FEPM, CSM

Possible areas of application:

Mechanical engineering, apparatus engineering, tree rails, agricultural machinery, mining machinery

Wipers / Guidances:

Dirt wipers protect the seals and guides from damage caused by dirt adhering to the piston rod. The lip of the wiper removes even the finest dirt from the piston rod.
Dirt wipers should always be replaced when replacing seals, even if they still appear to be sufficiently functional.

Wipers:

AS / ASOB / AUASOB / AUAS / AUAS-R / AUPS / P6 / P8 / P9 / PRW1 / PU5 / PU6 / PU7 / PU11 / PT1 / PT2 / PT1 DR HB

Guidances:

EKF / FRA / FRI / GUIVEX KBK / GUIVEX SBK / KB / KF / SB / SF

Piston seals

  • Seal rings: NA150 / NA250 / NA300 / NA400 / T18 / TM21 / TMP21
  • Compact seals: HDP 330 / L27 / L43 / TFMA / SIMKO 300 / SIMKO 320X2 / SIMKO 520 / T19 / T42 / T44
  • OMEGAT: OMK-DR HB / OMK-E / OMK-ES / OMK-MR / OMK-PU / OMK-S
  • Cup seals: T ( mit und ohne Feder )
  • Roof flashings: E3 / E3V / EK / EKV
  • Sealing kits: 0215 / 0217

Rod seals

  • Seal rings: NI150 / NI250 / NI300 / NI400 / T20 / T22 / T23 / T24 / TM20 / TM23 / TMP20 / LF300 / Syprim SM
  • Compact seals: KI310 / KI320 / TFMI / S8
  • OMEGAT: OMS-DR HB / OMS-MR / OMS-MR PR / OMS-S / OMS-S PR / OMSU-MR PR
  • Cup seals: H ( mit und ohne Feder )
  • Roof flashings: ES / ESV / E1 / E1V / E2 / E2V
  • Sealing kits: 0214 / 0216
  • V-packages: 1000

Pneumatic seals

Different types of seals are also used in pneumatics (energy transport using compressed air). A distinction is made between cylinder and valve seals. Cylinder seals are used as rod seals or piston seals, individually sealing, combined with wipers, damping or static. Valve seals are used as seat or slide seals

Common materials:

PTFE, NBR, FKM, POM, PEEK, EPDM, VMQ, BR, IIR, IR, AU, EU, NR, HNBR, FFKM, FVMQ, FEPM, CSM

Possible areas of application:

Mechanical engineering, apparatus engineering, tree rails, agricultural machinery, mining machinery

Guide / Damping seals

  • Damping seals: AUDIP / DIP
  • Guide: EKF / KF / SF

Piston seals

  • Seal rings: NAP210 / NAP300 / NAP310 / NAPN
  • Complete piston: NADUOP / PNEUKO G / PNEUKO M210 / PNEUKO M310 / TDUOP / TDUOPM / TDUOPAIR
  • Compact seal: Airzet PK / KDN

Rod seals

  • Combination elements: AUNIPSL / NIPSL / NIPSL200 / NIPSL210 / NIPSL300 / NIPSL310 / NIPSL320 / NIPSL-SF
  • Compact seal: Airzet PR

Static seals

  • O-rings / static seals: O-rings are mainly used for static sealing. Only in exceptional cases are they used as dynamic sealing elements
  • Round cord / round cord rings: finite O-ring profile, or ring vulcanized together from round cord
  • Back-up rings (back-up rings): These are used to prevent gap extrusion of radially sealing O-rings in dynamic applications
  • USIT rings: They are used for the static sealing of screw connections and flange connections

Rotary seals (radial shaft seals)

The designation of this seal for sealing rotating shafts against oils and greases is "radial shaft seals" according to DIN/ISO. The name Simmering® is a registered trademark of the company Freudenberg, the inventor of this system. This type is supplemented by trademarks.
In order to guarantee perfect functioning, it is necessary to determine the installation conditions, i.e. the lubricants used, pressure, temperature, shear forces and shaft surface as precisely as possible.

  • Type A: Shaft seals: A / AS / A-OF-RI / A-DUO
  • Type B: Shaft seals: B / BS / B-OF
  • Type C: Shaft seals: C / CSKassettendichtung: Typ 1 / Typ 2 / Typ 3
  • Radiamatic: R35 / R36 / R37 / R58 / RHS 51 / RPM 41
  • V-ring: V-rings: VA / VS / VL / VE

Stuffing box packing technology

Stuffing box packing technology is a proven method of sealing rotating shafts, plungers, spindles and certain static applications. Yarns, which can be natural or synthetic, are braided and impregnated in a specific process. The braids can consist of just one type of yarn or a combination of different yarns. This achieves a very high level of performance, which also meets modern requirements such as TA-Luft.

ALCHEM 6375 / FDA
Pure PTFE multifilament yarn with PTFE impregnation for fittings, plunger pumps and housing seals

For sealing all chemicals including concentrated, hot acids and alkalis. (Exceptions: molten alkali metals, fluorine, some fluorine compounds)

AROCHEM S 6216
Aramid multifilament yarn and PTFE-graphite compound yarn with PTFE impregnation and inlet lubricant for centrifugal and plunger pumps, mixers

For pumping hot water, salt solutions, alkalis, organic solvents, hydrocarbons and medium-concentrated acids

AROLAN II 6215
Packing made of aramid staple fiber yarn with PTFE impregnation and inlet lubricant for centrifugal pump applications

For pumping abrasive media (e.g. dirty water, crude oil), cold and hot water, salt solutions, organic solvents, hydrocarbons, oils, greases, diluted acids and alkalis

AROSTAT 6204
Abrasion-resistant aramid yarn with PTFE impregnation for valve applications.

For applications with cold and hot water, steam up to 180 °C, salt solutions, organic solvents, hydrocarbons, oils, greases, diluted acids and alkalis

CARBOSTEAM 6550
Carbon yarn packing with high-temperature impregnation Valve applications

For high-temperature steam applications in power plants, anti-extrusion protection and wipers for expanded graphite, for sealing hot water, hot air, steam, acids and alkalis Exception: Strongly oxidizing acids.

FLEXALON 6250 / FDA
Synthetic yarn packing with PTFE impregnation and inlet lubricant for centrifugal pump applications

For applications such as pumps, agitators, mixers, refiners. For cold and hot water, salt solutions, organic solvents, hydrocarbons, oils, greases, diluted acids and alkalis

G-SPEZIAL 6560
Expanded graphite yarn with Inconel wire reinforcement Also available without Inconel wire (G-SPEZIAL S 6565) for valve applications

For high-temperature applications in the process industry where media such as hot water, steam, gases, oils, acids and alkalis are present. Exception: Strongly oxidizing acids.

G-SPEZIAL S 6565
Expanded graphite yarn for valve applications

The service packing for high-temperature applications in the process industry. Media: Hot water, steam, gases, oils, acids and alkalis. Exception: Strongly oxidizing acids.

GRAFIFLEX 6501
Pure, expanded graphite for valve applications and cover seals:

With food approval (MPA), oxygen approval (BAM), drinking water approval (DVGW). For sealing hot and feed water, steam, heat transfer oils, hydrocarbons and many other media. Exception: Strongly oxidizing acids.

KOMBILON 6742 / FDA
Combination braid made of PTFE and carbon yarns with PTFE impregnation and inlet lubricant for centrifugal pump and agitator applications

For pumping alkalis, solvents, alcohols, ketones, esters, oil, acids, hot water, boiler liquor, brine and ammonia. Exception: Strongly oxidizing acids.

RAMILON 4586 / FDA
Ramie yarn packing with PTFE long-term impregnation and inlet lubricant for centrifugal and plunger pumps

For pumping cold water, seawater and hot water, aqueous solutions containing solids, oils, greases, solvents and foodstuffs

UNICHEM 6313 / FDA
Packing made of pure PTFE yarn with inlet lubricant for centrifugal pump applications and housing seals

All chemicals including concentrated hot acids and alkalis. Exceptions: Molten alkali metals, fluorine, some fluorine compounds). Also available as flat tape for flange and cover seals

UNICHEM 6315 / FDA
Packing made of white PTFE compound yarn with inlet lubricant
Pumps, fittings & static applications:

  • Chemical and food industry
  • All chemicals including concentrated acids and alkalis. Exceptions: Molten alkali metals, fluorine and some fluorine compounds

UNIFLEX 6588
Synthetic yarn with high carbon content, PTFE/graphite special impregnation and inlet lubricant for centrifugal pumps

For pumping cold and hot water, steam, aqueous solutions, diluted acids and alkalis. With silicone oil-free inlet lubricant

UNISTAT 6303 / FDA
PTFE/graphite compound yarn for fittings and plunger pumps

Food approval from MPA, Stuttgart; oxygen approval from BAM, Berlin. For sealing steam, condensate, alkalis, solvents and almost all acids. (Exceptions: fuming nitric acid, oleum)

UNIVAL 6323 / FDA
PTFE/graphite compound yarn with silicone oil for centrifugal pumps

For pumping almost all acids with the exception of fuming nitric acid and oleum, alkalis, solvents and bitumen. Food approval from the MPA, Stuttgart

UNIVERDIT 7000
Extruded packing made of PTFE/graphite compound Centrifugal and plunger pumps and fittings

Slow-running pumps and agitators. For acids, alkalis, solvents, steam, gases, hardening plastics, adhesives, paints, crystalline and abrasive media such as salt, sludge, ceramic pastes.

AROCHEM 6212
Packing made of PTFE yarn with corner reinforcements made of aramid yarn and inlet lubricant for plunger pumps

For pumping cold and hot water, organic solvents and chemical raw materials, oils, greases, diluted acids and alkalis

AROCHEM II 6211
Packing made of PTFE/graphite compound yarn and corner reinforcements made of aramid yarn for plunger pumps

For pumping cold and hot water, organic solvents and chemical raw materials, oils, greases, diluted acids and alkalis

AROLAN 6210
Multifilament aramid yarn with PTFE impregnation and inlet lubricant for plunger and centrifugal pumps

For hot and cold water, salt solutions, organic solvents, hydrocarbons, oils, greases, diluted acids and alkalis, steam up to 180 ºC

CARBOFLEX 6587
Carbon yarn packing with special PTFE/graphite impregnation for centrifugal pumps

For hot water, steam, aqueous solutions, almost universally resistant to acids and alkalis. Exception: Strongly oxidizing acids.

GRAFOLAN 6575
Graphite yarn packing with special PTFE impregnation for centrifugal pumps

  • Boiler feed water pumps, high-temperature applications, dryers, mixers
  • Acids, alkalis, hydrocarbons, boiler feed water, gases, steam. Exceptions: strongly oxidizing acids, such as hot sulphuric and nitric acid
  • Grafolan 6576 is available for static applications

UNIVAL GFO 6329
PTFE/graphite compound yarn with silicone oil for centrifugal pumps and fittings

For pumping almost all media. Exception: Strongly oxidizing acids.

UNIVAL II 6326
Graphite-impregnated PTFE yarn with silicone oil for centrifugal pumps

For pumping almost all acids. Standard packing in the chemical industry for almost any medium

Packing Cutting Gauge / Cutter
For easy cutting of package lengths

The packaging cutting gauge was developed for the practical cutting of packaging from the roll. This gauge is the only way to cut packings accurately and in line with the application.
Packing blanks with 45° radial bevel cut in the shaft/spindle diameter range from 5 to 120 mm and packing cross-section from 3 to 20 mm (measuring scale in millimetres and inches)

Packing Puller
For the simple, gentle and complete removal of old packings from the installation space

The helical tip drills effortlessly into all types of braided and woven packing. Even hard-to-reach stuffing box spaces can be reached with the flexible and strong shaft.
Packing pullers are available in sizes 0.1, 2, 3 depending on length and diameter.

  • 0 (L=495mm, Æ = 13mm)
  • 1 (L=440mm, Æ = 9,5mm)
  • 2 (L=330mm, Æ = 8mm)
  • 3 (L=220mm, Æ = 5mm)