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Spring Energized Seals | Synerings®

The Synering® system is an advanced sealing concept designed to meet extreme demands regarding temperature, medium, etc. which cannot be covered by conventional sealing compounds (like elastomers, PUR, fabric materials, etc.)
PTFE is hardly elastic. Therefore, PTFE sealing elements have to be combined with an elastic component, usually an O-ring. Synerings® consist of a PTFE part, made of a specially modi ed compound, and an energizing spring (standard: stainless steel). So, the outstanding thermal and chemical properties of PTFE can be used to full advantage.

NewDealSeals supplies a wide range of spring-energized seals as an economic alternative to for instance Balseal®, Flexiseal®, Omniseal® and Variseal®.

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Advantages Spring Energized Seal

  1. To make this sealing system readily available for existing equipment, the standard designs are dimensionally adapted too to be installed in standard O-ring grooves.
  2. Outstandingly high chemical and thermal resistance.
  3. Unlimited storing time.
  4. Synerings® can be sterilized in autoclaves or with any possible agent – except radioactive radiation.
  5. Easy to clean in assembled as well as in disassembled state.
  6. As Synerings® contain only PTFE and stainless steel, contacting media will not receive any contamination from the seal.
  7. No stick-slip effect.
  8. Very low friction.
  9. High sealing efficiency after a short running-in period.

How does the Synering® work

The Synering® is compressed radially resp. axially when installed in the seal gland. The resilient spring responds with constant force, pushing out the sealing lips. As system pressure is applied, the seal is additionally energized, increasing the sealing force.

In dynamic applications, the spring expands, compensating for seal wear while continuing to provide load. In conditions that see thermal cycling, the spring continues to energize the seal lips without taking a compression set or becoming too soft or too hard.

The exible spring provides a wide tolerance range that can help overcome hardware misalignment and eccentricity without causing excessive friction or leakage.

The main characteristics of the spring are the spring force and the de ection range. The spring force in uences the sealing function, friction and wear. The de ection range determines the ability of the seal to compensate for seal wear and variations in gland tolerances.

Technical Specifications

Working temperature

Synerings® with V-spring:

- 150 to + 225 °C

Synerings® with O-spring:

- 150 to + 260 °C

Velocity

Synerings® with V-spring

Reciprocating:

15-20 m/s

Helical and rotating:

≤ 4 m/s

Synerings® with O-spring

Reciprocating:

15-20 m/s

Helical and rotating:

≤ 4 m/s

Pressure

Synerings® with V-spring:

≤ 350 bar

Synerings® with O-spring:

≤ 800 bar

Profiles Spring Energized Seals

Profile S1

Rotating

The profile S1 consists of a PTFE sealing ring with a V-spring. The profile S1 is appropriate for rotating applications as an alternative to an O-ring in situations where sealing performance and friction have to be optimized.

Profile S2

Dynamic rod sealing

The profile S2 consists of a PTFE sealing ring with a V-spring. The profile S2 is appropriate for dynamic rod sealing applications as an alternative to an O-ring in situations where sealing performance and friction have to be optimized.

Profile S3

Dynamic piston sealing

The profile S3 consists of a PTFE sealing ring with a V-spring. The profile S3 is appropriate for dynamic piston sealing applications as an alternative to an O-ring in situations where sealing performance and friction have to be optimized.

Profile S4

Static inside sealing

The profile S4 consists of a PTFE sealing ring with an O-spring. The profile S4 is appropriate for static inside sealing applications as an alternative to an O-ring in situations where sealing performance has to be optimized.

Profile S5

Static outside sealing

The profile S5 consists of a PTFE sealing ring with an O-spring. The profile S5 is appropriate for static outside sealing applications as an alternative to an O-ring in situations where sealing performance has to be optimized.

Profile S6

Flange sealing: internal pressure

The profile S6 consists of a PTFE sealing ring with an O-spring. The profile S6 is appropriate for flange sealing applications with internal pressure as an alternative to an O-ring in situations where sealing performance has to be optimized.

Profile S7

Flange sealing: external pressure

The profile S7 consists of a PTFE sealing ring with an O-spring. The profile S7 is appropriate for flange sealing applications with external pressure as an alternative to an O-ring in situations where sealing performance has to be optimized.

Synering® 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.

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Contact details

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