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Piston Seals

Piston seals are used in cylinders to seal liquids. Piston seals are located in the cylinder head and seal against the cylinder wall, thus preventing leakage of liquids past the cylinder head.

NewDealSeals supplies a wide range of piston seals as an economic alternative to e.g. AQ Seal®, Bal Seal®, Double Delta®, Flexiseal®, Glyd Ring®, MSE® Seal, Omniseal®, Rimseal®, Stepseal®, VL Seal®, Variseal® and Wynseal®.

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Advantages Piston Seal

  1. Assembly on one-piece pistons.
  2. Minimal break-out and dynamic slide friction. Therefore no stick-slip. Steady movement is guaranteed even at low velocities.
  3. Low wear.
  4. High extrusion resistance.
  5. High temperature resistance.
  6. Compatibility with nearly all media due to the high chemical resistance of the piston sealing ring, and a wide selection of O-ring compounds.
  7. Available in diameters up to 1500 mm.

Technical Specifications

Type of movement

Rotary, reciprocating

Surface speed

≤ 4,0 m/s

Working pressure

Standard:

≤ 400 bar

In case of reduced extrusion gap (H7/f7):

≤ 600 bar

Profile P3:

≤ 160 bar

Profile P4:

≤ 16 bar

Working temperature

Standard:

-30 to +108°C

With FKM O-Ring:

-25 to +204°C

Profile P4:

-30 to +80°C

Standard materials O-Rings

NBR, FKM

Standard materials Piston Seals

Profile P1:

NDS-150, PTFE modified

NDS-66-, PTFE + 60% bronze

Profile P2:

NDS-123, PTFE 15% glass + 5% molybdenum disulfide

NDS-150, PTFE modified

NDS-660, PTFE + 60% bronze

Profile P3:

NDS-150, PTFE modified

Profile P4:

NDS-225, PTFE + 25% carbon

Profiles Piston Seals

Profile P1

For single-acting pistons in hydraulic cylinders

Profile P1 is particularly suitable for single-acting pistons in control cylinders, in servo controlled systems, machine tools and in construction machinery. Optimal sealing performance obtained if used in tandem with Guide Ring.
Good back-transport of oil film due to special shape of sealing edge.

Profile P2

For double-acting pistons in hydraulic cylinders

Profile P2 is suitable for double-acting pistons in control cylinders, servo-controlled systems, machine tools, quick acting and steering cylinders.
Capable of sealing dynamic pressure from both sides (bidirectional) at high pressure.

Profile P3

For dynamic applications

Profile P3 is appropriate for dynamic applications as an alternative to an O-ring in situations where sealing performance and friction have to be optimised.
Can be used in existing O-ring grooves.

Profile P4

For double-acting in pneumatic cylinders

Profile P4 is suitable for double-acting pneumatic pistons, e.g. in control cylinders, servo assisted equipment, and in quick-acting cylinders.
Can be used for pneumatic applications.

Piston Seal Materials

NDS® PTFE compound Characteristics Specifics Applications
NDS-100
PTFE virgin

Temperature range:

-190 to +230 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Most elastic PTFE type
  • Excellent chemical resistance
  • Excellent electrical insulating properties

O-rings, flat gaskets and light dynamic seals in food and chemical industry

NDS-123
PTFE +15% glass, +5% molybdenum disulfide

Temperature range:

-190 to +290 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Good dielectric properties
  • Increased creep resistance
  • Improved wear resistance

Piston seals, rod seals in medium duty dynamic applications, Valve seats

NDS-225
PTFE +25% carbon

Temperature range:

-190 to +315 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Good machinability, close tolerances and smooth surfaces possible
  • Excellent compression resistance
  • Good sliding and wear characteristics

Piston seals, rod seals, spring energized seals, bushings, wear guides.

NDS-235
PTFE +10% carbon fibre

Temperature range:

-260 to +310 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Good thermal conductivity
  • High wear resistance
  • Excellent sliding properties in water applications

Piston seals, rod seals, spring energized seals in water/fluid applications.

NDS-415
PTFE +15% graphite

Temperature range:

-190 to +230 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Excellent self lubricating properties
  • Low friction coëfficiënt

Piston seals, rod seals, spring energized seals for use against soft sealing surfaces.

NDS-640
PTFE +40% bronze

Temperature range:

-156 to +260 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Excellent creep resistance
  • Good thermal conductivity

Back-up rings and guiding strips. Rod and piston seals for heavy duty hydraulic applications.

NDS-660
PTFE +60% bronze

Temperature range:

-156 to +260 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Excellent creep resistance
  • Good thermal conductivity

Back-up rings and guiding strips. Rod and piston seals for heavy duty hydraulic applications.

NDS-750
PTFE + polyimide

Temperature range:

-260 to +310 °C

Chemical resistance:

Mechanical resist.:

Wear properties:

  • Low friction coëfficiënt
  • High wear resistance

Dynamic seals in (dry) running start-stop applications with a soft sealing surface.

Contact Us

We believe in the quality of our products and service. Fill out the form and one of our skilled engineers will contact you within the next business day.

Contact details

  • +31 (0) 226 362 233
  • info@newdealseals.com
  • Energiestraat 2-5, 1749 DN Warmenhuizen, Nederland