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MUI (Metal U-Ring for internal pressure application)

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Metal U-Ring

Internal pressure application

MUI

For internal pressure applications the outer diameter of the ring ODR is calculated as follows:

ODR = OD - Z

CSR Nominal cross-section: cross-sectional dimension (without coating) e.g. similar to the cord thickness of elastomer O-rings
Code Performance Index: shows characteristics of the ring (e.g. pressing load, springback)
D Groove depth: axial design dimension to which the ring is pressed from the original cross-section CSR.
F Pressing load: the mentioned guide values refer to 1mm seal length. To obtain the total load of the seal for the design of the construction, this value must be multiplied by the circumferential length of the seal.
OD Outside diameter of groove: reference dimension for internal pressure applications.
ODR min. Outside diameter of the ring: The outside diameter of the ring is freely selectable from the mentioned minimum dimension ODR min. and is at the same time the corresponding dimension to the outside diameter of the groove.
Pt coating thickness
R Radius: Design dimension that improves the support of the ring under pressure
SB Springback: maximum possible measure by which the ring can spring back elastically overall. Important value in connection with possible flange gaps.
Wmin groove width: radial design minimum dimension. The specified minimum dimension Wmin. must not be undercut.
Wt Wall thickness: sheet thickness of the ring.
Z diametric clearance between ring and groove.

The following ordering example describes a metal U-Ring for internal pressure application Typ MUI in

7
Material Inconel 718
3,18
Cross section 3,18 mm
w
with wall thickness 0,38 mm
0093,80
Ring outer diameter ODR 93,80 incl. coating
(suitable for groove outer diameter OD OD 94,00mm)
1
work hardened
S
Silver coating
M
0.03 - 0.05 mm thick
MUI - 7 - 3,18 w - 0093,80 - 1 S M

Configure MUI

Metal O-Ring MUI Installation space Performance
Nominal
cross-section		 Performance
index		 Wall thickness Outer diameter
ring		 diametrical
clearance		 Groove depth Groove width Radius Pressing load
(Guide values)		 Springback
(Guide values)
CSR
mm		 Code Wt
mm		 Ø ODR min.
mm		 Z
mm		 D
mm		 Tol.
mm		 W min.
mm		 R max.
mm		 F
ca. N/mm		 SB
ca. mm
2,39 w 0,25 30 0,15 1,90 +0,10 3,20 0,50 25 0,28
3,18 w 0,38 45 0,20 2,55 +0,10 4,20 0,75 30 0,35
3,96 w 0,41 65 0,25 3,20 +0,10 5,20 1,25 25 0,46
4,78 w 0,51 70 0,30 3,85 +0,15 6,40 1,30 25 0,70
5,60 w 0,51 80 0,35 4,50 +0,15 7,30 1,30 20 0,80
6,35 w 0,64 120 0,40 5,05 +0,20 8,50 1,50 30 0,85
9,53 w 0,97 300 0,58 7,70 +0,30 12,70 1,50 45 0,90
12,70 w 1,27 600 1,77 10,20 +0,30 16,50 1,50 60 1,20

Mentioned performance guide values are valid for seals made from Inconel 718 work hardened.
Other sizes not listed in table available on request.

Ring material

Ring material Code Material no.
Inconel 718 7 2.4668

Other materials on request.

Heat treatment

Heat treatment Code Description
HT 1 1 work hardened
HT 2 2 age hardened
HT 3 3 Solution annealing + precipitation hardened SC
HT 4 4 Solution annealing + precipitation hardened Std
HT 5 5 Heat treatment NACE MR 0175

Other treatments on request.

Coating

Coating Code max. temperature
Tin Z 200°C
PTFE P 290°C
Silver S 430°C (650°C*)
Copper C 930°C
Gold G 930°C
Nickel N 1200°C
without O –

* Only valid for non-oxidizing media.
Other materials on request.

Coating thickness

Coating thickness Pt Code
0,01 - 0,03 mm L
0,03 - 0,05 mm M
0,05 - 0,07 mm H

Other coating thicknesses on request.

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