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Brawn Seal

Movement

Reciprocating

Duty

High Pressure

Action

Single/Double

Description:

K.C. Seals Brawn® Seal is a compact, double acting rod or piston seal with almost no dead spots. The Brawn® Seal has excellent stability within the groove, meaning it eliminates the risk of seal roll and spiral failure. The Brawn® seal is commonly used as a T-Seal and O-Ring and back-up configuration replacement because of its high pressure rating.

Features:
  • One piece high pressure seal
  • Zero pressure trap
  • Fits into standard O-ring grooves
  • Easy installation
  • Ability to fit into existing grooves means that a retrofit can be made with no re-machining or major revisions to the existing hardware design.
  • Stress reduction
  • Non-twisting in dynamic applications
Applications:
  • High pressure applications
  • MWD tools
  • Molding machines
  • Aerospace equipment
  • Industrial hydraulics
  • Mobile equipment
  • O-ring replacement
  • T-seal replacement
Technical Data

Material:

Nitrile/FKM/HNBR/Urethane/Aflas

Material Code:

0101/0201/0120/2001/0400

Note: Alternative materials are available upon request

Temperature:

Nitrile

-40°C to +120°C
-40°F to +250°F

FKM

-26°C to +204°C
-15°F to +400°F

HNBR

-40°C to +150°C
-40°F to +320°F

Urethane

-54 ºC to +105 ºC
-65 ºF to +220 ºF

Aflas®

-09 ºC to +232 ºC
-16 ºF to +450 ºF

Speed:

3 ft/s

Pressure:

10,000 psi

Media:

Chemical compatibility chart

Note: All parameters can vary depending on the specific application, please take the above information as a general guideline. Should you have any concerns please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Technical Analysis

High pressure simulation: The FEA analysis shows complete failure of the HNBR O-Ring at 10,000 PSI with the HNBR Brawn seal showing slight failure at the non-sealing surface.

Figure 1.1. Observed FEA comparison of HNBR Brawn® Seal and HNBR O-Ring at 10,000 PSI and ambient temperature.

 

Seal geometry simulation

To show the importance of the radius that is machined at the non-sealing surface. K.C. Seals has simulated what happens to the sealing surface under compression with a radius machined at the back end of the Brawn seal(Figure 2.1), and what happens to the sealing surface without a radius (Figure 2.2). As depicted, Figure 2.1 shows no pressure trap and a more uniformed sealing surface in comparison with Figure 2.2, where the forces are concentrated in one small area, which happens to be the sealing face. This increases wear and the possibility of failures. To put the radius feature into context; when the force (pressure) is being applied to the sealing surface, the radius changes the direction of the counter force from the sealing surface to the non-sealing surface.

Figure 2.1. Brawn seal under compression with a radius at the non-sealing surface

Figure 2.2. Brawn seal under compression without a radius at the non-sealing surface

Hardware Design Guidelines & Part Numbers

Radial clearances: inch"

Bore Diameter RangeMaximum Clearance
0.123" to 0.375" 0.004"
0.376" to 1.500" 0.005"
1.501" to 4.500" 0.007"
4.501" to 8.500" 0.009"
Over 8.500" 0.010"

Note: Max Diametrical Gap can vary depending on what material is chosen, as well as the temperature and media of the application. Please contact our sales department for more info This email address is being protected from spambots. You need JavaScript enabled to view it.

Surface finish: µinch

Roughness DepthMating SurfaceGroove Surface
Rmax 40-160 <625
RzDin 25-100 <400
Ra 4-16 <63

brawn seal

Please contact KC Seals Inc for more information regarding housing recommendations. This email address is being protected from spambots. You need JavaScript enabled to view it.