Česky Česká verze

Spring-energized seals or radial seals

The spring-energized seals are designated for sealing of rotating machine parts and units filled by oils, greases, and by other liquid substances. Selection of due seals depends on existing operation parameters (environment, temperature, surface speed, etc.).

As a rule, the spring-energized seal consists of reinforcing metal ring, rubber parts, and of a draw spring, laid out with or without dust cap.

Standard materials:

Rubber material of radial seals:

Basis of elastomer

DIN ISO 1629

Hardness [Shore A]

Colour Temperature [° C]

Acrylnitrile-Butadiene-Rubber

NBR

70 black - 40 up to + 100
for a short term + 120

Fluorine-Rubber

FPM

80 brown - 30 up to + 200

PTFE material of WEPO and WCP21 rubbers:

Basis of elastomer

DIN EN ISO 1043- 1

Filler

Hardness
[Shore A]
Temperature
[° C]
Form

Acrylnitrile-Butadiene-Rubber

PTFE

carbon/graphite 62 - 30 up to + 205 WEPO

Fluorine-Rubber

PTFE

glass fibre/MoS2

60 - 80 - 90 up to + 250 WCP21

Special materials:

Basis of elastomer

DIN ISO 1629

Hardness [Shore A]

Colour Temperature [° C]

Silicone-Rubber

VMQ

70 red - 50 up to + 200

Acrylate-Rubber

ACM 70 black - 25 up to + 150

Ethylene-Propylene-Diene-Rubber

EPDM

70 black - 40 up to + 130

The shaft's surface speed

The shaft's surface speed corresponds to the slide speed of the mutual movement of sealing surfaces.

Diagram defining applicability of a seal as related to surface speed for individual material types:

Working pressure by standard spring-energized seals

max. pressure [bar]

rpm [min-1]

max. speed [m/s]

0,5

do 1000

2,8

0,35

do 2000

3,15

0,2

do 3000

5,6

Radial seal - type WA


- The WA shape has its external mantle of elastomer, which provides a very good static sealing.
- Corrosion of face side does not occur.
- More frequent exchange of the seal will prevent the damage of the seal seating hole.
- Designated for sealing of gaseous or thin liquid media.

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 1

Radial seal - type WAS

-  With dust cap against impurities and danger of corrosion

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 12

Radial seal – type WB

- It is characteristic for a metal external mantle.
- It secures firm and precise seating in a case.
- Tolerance of the seating hole is required so as to reach the sealing on the external mantle.
- Good quality of the mantle surface is necessary.

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 12

Radial seal – type WBS

- With dust cap against impurities and danger of corrosion

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 12

Radial seal - type WC

- Metal layer with a reinforcing cap.
- Packing and installation as with the WB.
- Used under especially heavy operation conditions, in rolling mills, for farming and logging machines, in windmills.
- Due to its increased stiffness, this radial seal is suitable under heavy-duty installation conditions of larger dimensions.

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 12

Radial seal - type WCS

- With dust cap against impurities and danger of corrosion

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 12

Radial seal - type VIA

- Radial seal with viton mantle and with metal reinforcing ring.
- The FPM material is more suitable for high temperatures, high speeds, and resists chemically aggressive media.

Material :
- FPM 80
- Colour: brown
- Reinforcing ring: plain steel
- Spring: stainless and acidproof steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -30 up to +200
- speed [m/s] : ≤ 35

Radial seal – type VIAS

-  With dust cap against impurities and danger of corrosion

Material :
- FPM 80
- Colour: brown
- Reinforcing ring: plain steel
- Spring: stainless and acidproof steel

Operation values:
- pressure [MPa/bar] : ≤ 0,05/0,5
- temperature [°C] : -30 up to +200
- speed [m/s] : ≤ 35

Radial seal - type WAO

- It has a grooved external mantle of elastomer, metal reinforcing ring and sealing lip without spring.
- Advantage: low friction.
- The external mantle of elastomer enables good static sealing and offers good accommodation of the thermal expansion.
-  Upon higher roughness secures better sealing properties for liquid or gaseous media.

Material :
- NBR 70
- Colour: green/black
- Reinforcing ring: plain steel

Operation values:
- pressure [MPa/bar] : ≤ 0/0
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 6

Radial seal - type WBO

- Radial seal with metal external mantle, without spring.

Material :
- NBR 70
- Colour: green/black
- Reinforcing ring: plain steel

Operation values:
- pressure [MPa/bar] : ≤ 0/0
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 6

Radial seal - type WAD

- Radial spring with two sealing lips and external rubber mantle.
- Especially for sealing two media or heavy pollution from outside.

Material :
- NBR 70
- Colour: black
- Reinforcing ring: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,03/0,3
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 6

Radial seal - type WBD

- Radial spring with two sealing lips and external rubber mantle.
- Especially for sealing two media or heavy pollution from outside.

Material :
- NBR 70
- Colour: green/black
- Metal case: plain steel
- Spring: plain spring steel

Operation values:
- pressure [MPa/bar] : ≤ 0,03/0,3
- temperature [°C] : -40 up to +100
- speed [m/s] : ≤ 6

Type WCP21

- Radial seal with the sealing lip of PTFE and with rubber pre-stressing ring, that are installed between two metal cases.
- The PTFE's very low friction coefficient prevents stammering, reduces start-up resistance, and is suitable on dry run or on insufficient lubrication.
- Applicable for higher speeds, higher pressure load, and for higher temperatures.
- For sealing aggressive chemicals (excellent technical stability of PTFE).
- Various layouts feature one or two lips.

Material :
- razor edge sealing: PTFE + fibreglass / MoS2
- Colour: grey
- Metal case: stainless and acidproof steel
- Rubber part: FPM

Operation values:
- pressure [bar] : 5 bar / 10 bar / 25 bar
- temperature [°C] : -90 up to +250
- speed [m/s] : ≤ 40

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