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FLAT SEALS


 

 

BARBIERI manufactures square or rectangular section washers or flat seals, both to standard sizes and made to customer specifications.


flat seals

 

Rubber washer-type seals can be used for a wider range of applications than the traditional OR, as they give a much more ample seal surface. Also they work properly both under minimum and considerable pressure and compression levels.

 

The elasticity of the rubber allows the seal to be maintained even when the it is possible to decide the mix and hardness of the flat sealssurfaces in contact with the washer move, provided the movements in the flanges or pipes remain within the elastic limits of the rubber used to manufacture the seal, and that the frequency of movements is not so high as to overheat the seal due to hysteresis.

 

The choice of mix and hardness  is strategic when using washer seals, as the contact surface is usually large and the results obtained may differ widely if the hardness is changed even by a very little


BARBIERI can produce this particular type of seal using two different manufacturing processes:

 

- Using a mould

-    Using a moulded sleeve

 

Using a mould

 

The manufacturing process for moulding of individual rubber seals makes it possible to achieve extremely limited tolerances, but the edges of the seal cannot have a radius of 0 due to mould processing requirements.

 

moulded rubber sleeve

 

Using a moulded sleeve

This manufacturing process involves cutting the seal from a moulded rubber sleeve.

 

First of all, a rubber sleeve with the exact internal and external diameter of the finished seal but with a much greater length is moulded. Once this “rubber pipe” has been obtained, it is cut usingrubber sleeve used to obtain the flat seals special machinery to the required thickness, thus creating the required seal. This system produces perfectly flat seals with 0 radius edges.

 
 

 

However, to obtain economical rubber seals using this manufacturing process it is necessary to produce medium-large amounts.

In short, the advantages of using this seal manufacturing process are:

- Thickness tolerance +/- 0.10.

- Excellent quality-price ratio, in particular for large quantities.

- Perfectly flat pieces, which can also be used for automatic assembly.

- Ability to create seals of different thicknesses using the same sleeve, without having to go to the expense of additional moulds.

 

- Maximum seal thanks to the sharp edges.

 

 

BARBIERI is able to manufacture washer type seals in various different materials, so as to maintain the characteristics of the rubber at length even when working in extreme environments or under special operating conditions. At other times, the choice of mix is based on the product specifications.


Suggested materials for rubber flat seals:

NR Natural rubber
SBR Styrene-butadiene rubber
EPDM Ethylene-pylene terpolymer
EPDM Per Peroxide EPDM
NBR Nitrile rubber
NBR/PVC Nitrile rubber + polyvinylchloride
HNBR Hydrogenated nitrile rubber
VMQ Silicone rubber
NEO Neoprene
NEO + Not combustible Neoprene
FKM Fluorocarbonic rubber tetrapolymer(Viton®)


flat seals design
 

  (measures in mm)

Ø EST Ø INT H Min-Max   Ø EST Ø INT H Min-Max   Ø EST Ø INT H Min-Max
10 6 1-30    32 18 1-70   50 32 1-70
10,5 6 1-30   32 15 1-70   50 33 1-70
14,5 10 1-30   33 21 1-70   50 40 1-70
15 8 1-70   35 20 1-70   51,5 10,5 1-70
15,2 11,1 1-70   35 12 1-70   51,5 44,5 1-70
17,4 13,5 1-70   35 26 1-70   53 27 1-70
17,8 11 1-70   35,9 25,9 1-70   53 33 1-70
18 11,8 1-70   36 28 1-70   53,5 45,3 1-70
19 10 1-70   36,9 26,9 1-70   54 26 1-70
19,2 11,5 1-70   37 20 1-70   54,1 48,1 1-70
19,5 7,5 1-70   38 25 1-70   55 28 1-70
19,9 14 1-70   38 26 1-70   55 39 1-70
20 13 1-70   38 23 1-70   55 45 1-70
20 12 1-70   38 28 1-70   55,5 50,5 1-70
22 16,5 1-70   38,5 25 1-70   56 26 1-70
22 8 1-70   39 18 1-70   56 44 1-70
22,4 17,5 1-70   39 30,5 1-70   58 38 1-70
23 17 1-70   39,5 27,5 1-70   58 41,5 1-70
23 9 1-70   40 30 1-70   58 42 1-70
23,5 14,8 1-70   40 28 1-70   58 47 1-70
23,5 12 1-70   40 26 1-70   58 49 1-70
24 18 1-70   40 22 1-70   58 52 1-70
24 16 1-70   42 32 1-70   59 47 1-70
24 10 1-70   42 25 1-70   60 40 1-70
24 8 1-70   42,7 32,7 1-70   60 54 1-70
24 12 1-70   43 27 1-70   60 40 1-70
24,5 17 1-70   43 11 1-70   60 36 1-70
25 14 1-70   44 32 1-70   60 30 1-70
25 19 1-70   44 35 1-70   61 54 1-70
25 13,5 1-70   44 34 1-70   78 39 1-70
25,5 13,5 1-70   44,4 38 1-70   80 56 1-70
26 17,6 1-70   44,9 34,9 1-70   80 54 1-70
26,5 21 1-70   45 40 1-70   82 45 1-70
27 20 1-70   45 39 1-70   83 74 1-70
27 15 1-70   45 10 1-70   84 59 1-70
28 20 1-70   45 33 1-70   84 75 1-70
28 22 1-70   45,5 33 1-70   84,2 75,1 1-70
28 6,5 1-70   46 40 1-70   84,2 75,2 1-70
28 18 1-70   46 33 1-70   85,5 81 1-70
28 15 1-70   47 32,5 1-70   86 59 1-70
28 6,5 1-70   47 42 1-70   87 81 1-70
29,5 14,5 1-70   47 40 1-70   115 94 1-70
30 10 1-70   47 30 1-70   115 96 1-70
30 14 1-70   47,7 42,5 1-70   115,7 95 1-70
30 12 1-70   48 31,5 1-70   123 112 1-70
30 16 1-70   48 32 1-70   124 90 1-70
30 13 1-70   48 42 1-70   136 112 1-70
30 25 1-70   48,1 31,8 1-70   140 132 1-70
30,5 20 1-70   49 29 1-70   144 90 1-70
30,7 20 1-70   49 39 1-70   165 154 1-70
31,5 20 1-70   49,5 39,5 1-70   173 165 1-70
32 26 1-70   50 14 1-70   212 200 1-70
32 21 1-70   50 29 1-70        

 

    


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