Stroke seals

Piston, rod and wiper seals for hydraulic and pneumatic applications

  • Stroke seal overview: Rod seal and wiper scraper
  • Stroke seal overview: Rod seal and wiper scraper

The essential elements of fluid power control

The countless ways of utilizing power by fluid circuits could not be feasible without these key parts. Stroke seals are single or composite devices utilized to maintain the fluid separation (either liquid or gaseous) between two chambers of either the hydraulic or the pneumatic actuators. In this way, fluids flow only through the defined paths  and transfer the power according the machine's purpose.  In most cases, the actuators in which they are built-in produce reciprocating motions (strokes), but in other cases, they can produce angular oscillations, too. To satisfy this spectrum of dynamic applications, a comprehensive range of designs is needed. Depending on the specific function, a range of different seal types can be used that are categorized as Piston Seals, Rod Seals, Rotary Seals, Wipers, and Guide Rings.

Stroke seals are most popularly used in the sealing systems of hydraulic and pneumatic cylinders designed for automatic machines, presses, power steering systems and agriculture machines. Other more sophisticated applications include different sealing systems for either heavy-duty hydraulic cylinders (like the actuators for construction equipment) or for other devices like fluid flow control by dozing valves used in the Food & Beverage, Pharma, and Chemical Processing Industry.

But the primary sealing function is only one requisite an effective and reliably performing stroke seal needs to fulfill, as other features are essential, too.
 

Material knowledge is a key factor for high performing seals

Be it a rubber or a plastic seal, choosing the right materials can provide proper chemical inertia against the media in contact, correct physical performance against the working temperature and the working pressure, and the necessary tribological properties to offer low friction and high abrasion resistance.

A wide range of PTFE compounds, but also Polyurethane and other elastomers like NBR, HNBR and FKM compounds are available at Angst+Pfister for either lubricated or dry working conditions. And according to the application, they can be designed for self-energizing, with rubber energizing components, and with steel springs. 

It goes without saying that best solution for your sealing application can be achieved by making use of our highly specialized competence in the area of materials. Together with our engineering know-how for conceiving the most effective stroke seal design, this makes for a recipe for success!
 

Finalizing the effective solution

Working pressure, speed, dimensional constraints, working temperature, chemical composition of the media to be sealed, low friction, and long endurance are all conditions that an effective solution needs to satisfy. Angst+Pfister has developed the specific expertise over a century of activities across different OEM industries to support you in defining the most suitable sealing solutions.

Angst+Pfister offers a comprehensive range of standard normalized sealing items shown in the table below, as well as the possibility of co-designing customized devices to fully meet even the most stringent customer’s requirements for demanding applications. Our engineering and product application specialists aim to provide leading-edge technology and valuable solutions for all your hydraulic and pneumatic applications. Get in touch with us now!

 

Applications

  • Aggressive media
  • Foodstuffs
  • Gas applications
  • Heavy-duty cylinders
  • High / low temperature
  • Industrial hydraulics
  • Injection machines
  • Machine tools
  • Medical technology
  • Mobile hydraulics
  • Pneumatics
  • Pneumatic cylinders
  • Poorly lubricated applications
  • Presses
  • Standard cylinders
  • Valves
  • Water hydraulics
 

Piston Seals

Piston seals can be either single-acting or double-acting elements; in the first case, they have to withstand the pressure from one side, in the latter, pressure comes alternatively from both sides. An excellent combination of tightness, lubricating behavior, friction and extrusion resistance is the key success factor. There are different profile designs and materials to choose from, depending on your application. Angst+Pfister offers a wide range of high-quality engineered piston seals, either as standard or as special design.

 

Rod Seals

Rod seals are single-acting elements that must ensure no leakage into the atmosphere at all and thus are impacted by all operating conditions. Furthermore, low friction, high mechanical properties, compact design and ease of installation are some of the key requirements demanded by the market. Geometry and materials used depend on several factors. Angst+Pfister offers a wide range of high-quality engineered rod seals, either as standard or as special design. Contact our engineers for the most appropriate and cost-effective solution.

 

Wiper Seals

Wiper seals are used to prevent internal contamination of the hydraulic system while the rods retract. Single-lip or double-lip types are available. Profile and material to be used will not only depend on your parameters but also from the rod seal system chosen, such as tandem arrangement. Angst+Pfister offers a wide range of high-quality engineered wiper seals, either as standard or special types.

 

Guide Tapes/Rings

Guide tapes or guide rings guide the piston/ rod, protect from metallic contact between the sliding parts and absorb any radial loads which occur. They are available out of roll (cut to the correct length) or available as a pre-formed ring. Material and quantity of wear rings to be used will depend upon your application. Angst+Pfister offers engineered filled PTFE as well as POM, PA and fabric reinforced composite material guide rings.

Product List

Product Image Applications Application Standard Action Parameters Order
      Light Medium Heavy ISO / DIN Single action Double acting Temperature Range (°C) Speed (m/s) Pressure (Mpa max.) Seal material  
Piston Seal GRP Standard cylinders, mobile hydraulics, injection machines, presses x x x ISO 7425/1   x -40 to +200 15 40 PTFE BC.429-01
NBR or FKM
 
Piston Seal LRP Standard cylinders, pneumatics, industrial hydraulic, machine tools x x       x -40 to +200 15 20 PTFE CG.18-01
NBR or FKM
 
Piston Seal DDP Standard cylinders, pneumatics, industrial hydraulic, machine tools x     ISO 3601
AS 4716
  x -40 to +200 15 20 PTFE MD.429-03
NBR or FKM
 
Piston Seal PSO Standard cylinders, mobile hydraulics, industrial hydraulics   x x ISO 7425/1   x -35 to +100 0.5 25 TPU 93.447-01 and NBR  
Piston Seal VSP100 High/low temperature, aggressive media, foodstuffs, valves, medical technoloy x x x AS 4716 x   -200 to +260 15 40 PTFE CF.429-01 and stainless steel V spring  
Piston Seal PSA Standard cylinders, mobile hydraulics, industrial hydraulics x x   ISO 5597/1 x   -35 to +100 0.5 40 TPU 93.447-01  
Piston Seal PAE Standard cylinders, mobile hydraulics, industrial hydraulics   x x ISO 5597/1 x   -35 to +100 0.5 50 TPU 93.447-01  
Piston Seal RPS Standard cylinders, mobile hydraulics, industrial hydraulics x x   ISO 5597/1 x   -35 to +100 0.5 40 TPU 93.447-01  
Piston Seal UM Standard cylinders, mobile hydraulics, industrial hydraulics x x     x   -30 to +100 0.5 10 NBR 90.447-01  
Piston Seal DEM Standard cylinders, mobile hydraulics, industrial hydraulics x x     x   -30 to +100 0.5 10 NBR 75.447-01  
Piston Seal DMP Standard cylinders, mobile hydraulics, industrial hydraulics x x     x   -30 to +120 0.5 40 NBR 65.428-02 
NBR 75.428-01
 
Piston Seal KDAE   Standard cylinders, mobile hydraulics, industrial hydraulics x x x     x -30 to +100 0.8 40 TPU 93.447-01
TPE 63.447-01
 
Piston Seal KDSB   Standard cylinders, mobile hydraulics, industrial hydraulics x x   ISO 6547   x -30 to +100 0.5 30 TPE 63.447-01
NBR 70.447-02
POM
 
Piston Seal MPP Pneumatic cylinders x         x -30 to +100 1 2 NBR 75.447-02  
Piston Seal PSP Pneumatic cylinders x       x   -30 to +100 1 2 TPU 90.447-01  
Piston Seal SPS/N Pneumatic cylinders x         x -30 to +100 1 1.2 NBR 80.447-01  
Rod Seal SSR Standard cylinders, mobile hydraulics, injection machines, presses, machine tools x x x ISO 7524/1   x -40 to +200 15 40 PTFE BC.429-01
NBR or FKM
 
Rod Seal LRC Standard cylinders, pneumatics, industrial hydraulic, machine tools x x   ISO 7524/1   x -40 to +200 15 20 PTFE CG.429-01
NBR or FKM
 
Rod Seal DDR Standard cylinders, pneumatics, industrial hydraulic, machine tools x     ISO 3601
AS 4716
  x -40 to +200 15 20 PTFE MD.429-03
NBR or FKM
 
Rod Seal VSR 100 High/low temperature, aggressive media, foodstuffs, valves, medical technology x x x AS 4716 x   -200 to +260 15 40 PTFE CF.429-01 and stainless steel V spring  
Rod Seal RSA Standard cylinders, mobile hydraulics, industrial hydraulics x x   ISO 5597/1 x   -35 to +100 0.5 40 TPU 93.447-01  
Rod Seal RSB2   Standard cylinders, mobile hydraulics, industrial hydraulics   x x ISO 5597/1 x   -35 to +100 0.5 50 TPU 93.447-01
POM 118.447-01
 
Rod Seal RPS Standard cylinders, mobile hydraulics, industrial hydraulics x x   ISO 5597/1 x   -35 to +100 0.5 40 TPU 93.447-01  
Rod Seal DMR Standard cylinders, mobile hydraulics, industrial hydraulics   x x   x   -30 to +120 0.5 40 NBR 65.428-02 
NBR 75.428-01
 
Rod Seal UM Standard cylinders, mobile hydraulics, industrial hydraulics x x     x   -30 to +100 0.5 10 NBR 90.447-01  
Rod Seal DIM Standard cylinders, mobile hydraulics, industrial hydraulics x x     x   -30 to +100 0.5 10 NBR 90.447-01  
Rod Seal RSF8 Standard cylinders, mobile hydraulics, industrial hydraulics x x     x   -30 to +120 0.3 20 NBR 65.428-02 
NBR 75.428-01
 
Rod Seal RSP Pneumatic cylinders x       x   -30 to +90 1 2 TPU 90.447-01  
Rod Seal SRS/N Pneumatic cylinders x         x -30 to +100 1 1.2 NBR 80.447-01  
Wiper Seal WSG Standard cylinders, mobile hydraulics x x     x   -35 to +100 0.8 0 TPU 94.447-02
metal insert on OD
 
Wiper Seal WWS Standard cylinders, mobile hydraulics x x     x   -35 to +100 1 0 >36mm=TPU 90.447-01
<36mm=TPU 93.447-01
 
Wiper Seal WSL Standard cylinders, mobile hydraulics x x x   x   -35 to +100 1 0 TPU 93.447-01  
Wiper Seal WED Standard cylinders, mobile hydraulics x       x   -35 to +100 1 2 TPU 93.447-01  
Wiper Seal WES 100 Standard cylinders, mobile hydraulics x x     x   -40 to +200 15 0 PTFE BC.429-01
NBR or FKM
 
Wiper Seal WES 500 Heavy-duty cylinders, mobile hydraulics, presses x x x   x   -40 to +200 15 0 PTFE BC.429-01
NBR or FKM
 
Wiper Seal BWA Pneumatic cylinders x       x   -30 to +90 1 2 TPU 90.447-01  
Guide Tape/Ring GT   Standard cylinders, mobile hydraulics, injection machines, presses, machine tools x x       x -60 to +150 15 15 PTFE BC.429-01  
Guide Tape/Ring GT   Pneumatics, water hydraulics, valves, gas applications, poorly lubricated applications x x       x -60 to +150 15 15 PTFE CG.429-01  

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