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Dowty Seals

Dowty seals, also called bonded seals, are a washer kind of seal used to tighten the connection around screws and bolts.

They are typically made of both a metal and an elastomer material.

​Dowty seals are usually rounded in shape and are used in high-pressure applications in mechanical, hydraulic, and pneumatic systems.

​They are known to withstand pressure as high as 20000PSI.
Material Specification
  • ​Stainless Steel SS316 / Steel
Size Range
  • ​1/8” to 3”
Size Specification
  • Inches 
  • Metrics
CATALOGUE :

​​​​​​Dowty Seals


What is Dowty Seals

PictureDowty Seals
1. What Are Dowty Seals?

There would be a tendency for fluid leakage in pipe or tube connections if the connection were metal to metal. Leakages can have grave repercussions in any system. They cause wastage of resources; they also tremendously affect the system’s working temperature and pressure. It goes without mentioning that exposure to the fluid can be environmentally harmful. This explains the need for seals at connection points. 

Seals are generally used to prevent leakage in a system, and depending on the application, they may be of various types. Examples of weeks include gaskets, O-rings, face seals, lip seals, and of course, dowty seals (also called bonded seals). Dowty seals providers a tight end to end connection in pipeline systems. They are ring-shaped made of both metal and elastomer material.

2. What are Dowty Seals made of?
​
As mentioned earlier, dowty seals are made of 2 materials, a metal, and an elastomer material. The metal is typical steel, while the elastomer is NBR (nitrile rubber). Note that the metal could also be made of stainless steel SS316, SS304, aluminum, brass, etc., depending on its application.

NBR, on the other hand, is a popular kind of rubber made of butadiene and acrylonitrile. Their wide popularity can be attributed to their resistance to chemical, fuel, and oil. Refer to the table below for the properties of NBR.​
Property
Value
Density
It can be compounded around 1.00 ​g/cm³
Tensile failure stress, ultimate
500 - 2500 PSI
Hardness (Shore A)
30 - 90
Elongation after fracture in 1%
600% Maximum
PictureDowty Seals
3. What are the benefits of Dowty Seals?

Dowty seals are advantageous during pipe and tube installation. Specifically, these are some of the reasons you should get dowty seals as per below:  

  • Dowty seals are flexible. Hence they can fit in a variety of devices. 
  • They can be used for high pressure and low-pressure systems. 
  • They are cost-effective accessories for securing connections during installation
  • The rubber and metal combination prevents over-compression and extrusion 
  • It is a safe and secure way of avoiding overfitting. ​​

4. What are the sizes of Dowty Seals?

Dowty seals are made in different sizes and designed to work at different temperatures. The table below shows the dimensions of varying dowty seals and their working temperature. 
Picture
The table below is a tube and hose selection chart for nozzle and projectiles.
The table below is a selection chart for metallic pipes.
Thread Inches Size
Size Reference
d +/- 0.13
C Centralizing Lip
E +/- 0.05
P +/- 0.13
R +/- 0.10
d1 +/- 0.10
D +0.13
S +/- 0.10
1/8 BSP
820
10.37
8.26
​(+0.25/-0)
0.35
0.38
0.20
11.84
15.88
2.00
1/4 BSP
821
13.74
11.18
​(+0.25/-0)
​0.35
​0.38
​0.20
15.21
20.57
2.00
3/8 BSP
823
17.28
14.76
​(+0.25/-0)
​0.35
​0.38
​0.20
18.75
23.80
2.00
1/2 BSP
825
21.54
18.24
​(+0.25/-0)
​0.35
​0.38
​0.20
23.01
28.58
2.50
5/8 BSP
826
23.49
20.27
​(+0.25/-0)
​0.35
​0.38
​0.20
24.97
31.75
2.50
3/4 BSP
827
27.05
23.83
​(+0.25/-0)
​0.35
​0.38
​0.20
28.53
34.93
2.50
7/8 BSP
829
30.81
27.51
​(+0.25/-0)
​0.35
​0.38
​0.20
32.29
38.10
2.50
1 BSP
830
33.89
29.92
​(+0.25/-0)
​0.35
​0.38
​0.20
36.88
42.80
​3.20
1 1/4 BSP
832
42.93
38.45
​(+0.25/-0)
​0.35
​0.38
​0.20
45.93
52.38
3.20
1 1/2 BSP
833
48.44
44.45
​(+0.25/-0)
​0.35
​0.38
​0.20
51.39
58.60
3.20
1 3/4 BSP
834
54.89
50.42
​(+0.25/-0)
​0.35
​0.38
​0.20
58.30
69.85
3.20
2 BSP
836
60.58
56.26
​(+0.25/-0)
​0.35
​0.38
​0.20
63.63
73.03
3.20
2 1/4 BSP
838
66.68
62.36
​(+0.25/-0)
​0.35
​0.38
​0.20
69.98
79.50
3.20
2 1/2 BSP
839
76.08
71.50
​(+0.25/-0)
​0.35
​0.38
​0.20
79.38
90.17
3.20
Thread Inches Size
Size Reference
d +/- 0.13
C Centralizing Lip
E +/- 0.05
P +/- 0.13
R +/- 0.10
d1 +/- 0.10
D +0.13
S +/- 0.10
M8
866
8.70
6.40
​(+0.25/-0)
0.35
0.38
0.20
10.40
14.00
1.00
M10
708
10.70
8.05
​(+0.25/-0)
​0.35
​0.38
​0.20
12.40
16.08
1.50
M12
867
12.70
9.73
​(+0.25/-0)
​0.35
​0.38
​0.20
14.10
19.00
1.50
M14
868
14.70
11.39
​(+0.25/-0)
​0.35
​0.38
​0.20
16.40
22.00
1.50
M16
870
16.70
13.41
​(+0.25/-0)
​0.35
​0.38
​0.20
18.40
24.00
1.50
M18
872
18.70
14.76
​(+0.25/-0)
​0.35
​0.38
​0.20
20.40
26.00
1.50
M20
873
20.70
16.76
​(+0.25/-0)
​0.35
​0.38
​0.20
22.50
28.00
1.50
M22
874
22.70
18.74
​(+0.25/-0)
​0.35
​0.38
​0.20
24.40
30.00
2.00
M24
875
24.70
20.11
​(+0.25/-0)
0.35
0.38
0.20
26.40
32.00
2.00
5. Torque value for the Dowty Seals?

The summary of torque values for dowty seals as shown below:
Thread Size
​(Metric)
Thread Size
​(Imperial)
Thread Size
​(BSP)
Torque Required
(Ibs.in)

Torque Required
​(Nm)
Up to 8
5/16
-
47
5.3
10
3/8
1/8
63
7.1
11
7/16
-
105
11.8
12
1/2
1/4
140
15.8
14
9/16
.60 x 19
200
22.6
16
5/8
3/8
270
30.5
18
3/4
0.75 x 14
360
40.7
20
.825
1/2
500
56.5
22
7/8
5/8
600
67.8
24
1
-
650
73.4
27 and above
1.041
3/4
700
79

CATALOGUE :

​​​​​​Dowty Seals


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  • About
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  • Products
    • Pipes and Tubes >
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    • High Pressure Valves >
      • High Pressure Ball Valves
      • SAE Flange Check Valves
      • Needle Valves
      • SAE Flange End Ball Valves
      • High Pressure Check Valves
      • ISO 6164 Ball Valves
    • High Pressure Fittings >
      • Compression Fittings
      • Ferrule Fittings
      • Forged Pipe Fittings
      • JIC Fittings
      • Quick Release Couplings
      • Pipe Adapter Fittings
    • Low Pressure Valves >
      • Ball Valves >
        • 1 Piece Ball Valve
        • 2 Piece Ball Valve
        • 3 Piece Ball Valve
        • L-Port Ball Valve
        • T-Port Ball Valve
        • Brass Ball Valve
        • Brass Mini Ball Valve
        • Stainless Steel Mini Ball Valve
      • Flange End Ball Valves >
        • PN10/16 SS316 Flange End Ball Valve
        • ANSI 150# SS316 Flange End Ball Valve
        • ANSI 300# SS316 Flange End Ball Valve
        • JIS 10K SS316 Flange End Ball Valve
        • ANSI 150# Cast Steel Flange End Ball Valve
        • ANSI 300# Cast Steel Flange End Ball Valve
      • Swing Check Valves >
        • ANSI 150# SS316 Swing Check Valves
        • JIS 10K SS316 Swing Check Valves
        • ANSI 150# Cast Steel Swing Check Valve
        • Threaded End SS316 Swing Check Valves
        • Threaded End Brass Swing Check Valves
      • Single Plate Check Valves
      • Dual Plate Check Valves
      • Spring Check Valves
      • Y-Strainers >
        • ANSI 150# SS316 Y-strainer
        • JIS 10K SS316 Y-strainer
        • Threaded End SS316 Y-strainer
        • ANSI 150# Cast Steel Y-strainer
        • JIS 10K Cast Steel Y-strainer
      • Gate Valves >
        • ANSI SS316 150# Gate Valve
        • JIS 10K SS316 Gate Valve
        • Threaded End SS316 Gate Valve (200 PSI)
        • Threaded End SS316 Gate Valve (800 PSI)
        • ANSI 150# Cast Iron Gate Valve
        • JIS 10K Cast Iron Gate Valve
        • ANSI 150# Cast Steel Gate Valve
        • ANSI 150# Forged Steel Gate Valve
        • Threaded End Forged Steel Gate Valve
        • Welded End Forged Steel Gate Valve
      • Globe Valves >
        • ANSI 150# SS316 Globe Valve
        • JIS 10K SS316 Globe Valve
        • Threaded End SS316 Globe Valve (200 PSI)
        • Threaded End SS316 Globe Valve (800 PSI)
        • ANSI 150# Cast Iron Globe Valve
        • JIS 10K Cast Iron Globe Valve
        • ANSI 150# Cast Steel Globe Valve
        • ANSI 150# Forged Steel Globe Valve
        • Threaded End Forged Steel Globe Valve
        • Welded End Forged Steel Globe Valve
      • Butterfly Valves >
        • ANSI 150# Cast Iron Butterfly Valve
    • Low Pressure Fittings >
      • Class 150 Fittings
      • Camlock Fittings
    • Accessories >
      • Pressure Gauges
      • Stauff Test Couplings
      • Walform Machine
      • GS Retain Ring
      • Bonded Seals
      • Stauff Tube Clean Systems
      • Dowty Seals
      • Stauff Level Gauge
      • Stauff Filler Breathers
      • Anti-bloc Fett
  • Catalogues
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    • Accessories
  • Contact
  • MYREWARDS
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