Kaco U-rings Piston Seals With Adhesive Component PNA

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Kaco U-rings with adhesive component PNA are predominantly used in hydraulics up to 100 bar as well as in pneumatics as piston seals. In the radial direction, they require only a small installation space.

For the purpose of longitudinal support, the internal, static sealing lip is longer than the dynamic lip. Therefore, it is possible to use it without a support ring or any other additional support.

The diameters of PNA type U-rings are somewhat smaller than the rated dimension and these are expanded somewhat during installation. Thus, it is possible to ignore the relatively large tolerances referred to the diameter, especially in the case of cylinder diameters over 100 mm, and to base production on the essentially smaller tolerances referred to the sealing ring cross-section. The advantage achieved by this tolerating measure especially has an effect on the dynamic sealing lip and results in a lower frictional force range.

For sealing of fluids, the dynamic sealing lip has sharp edges and its cross-section is designed for a lower frictional force and a long service life. For some time now, we have been applying our optimum sealing lip design experience (refer to page 5) to this version for use in the field of pneumatics. Due to the high demands placed on the frictional force behavior and service life in the case of oil-free or untreated compressed air, the sealing edges are increasingly being designed in accordance with the rounded version.

Refer to the designation for the design of the sealing lips:

PNA…N  sharp sealing edge (trimmed)
PNA…A   rounded sealing edge (completely molded).

Technical data:
Pressure range

hydraulics                                 ≤ 100 bar

pneumatics                               ≤  16 bar
Permissible sliding speed

hydraulics                                 ≤  0.3 m/s

pneumatics                               ≤  1 m/s
Tolerances

dynamic (cylinder)             H11

static (piston)                      H11

Because of their small cross-section, PNA U-rings can be easily expanded to enable easy manual installation on the piston (figure 29). Installation spaces can be easily obtained with low manufacturing effort. Ensure that the groove width is always 0.5 to 0.8 mm larger than the installation width of the sealing ring.

 

 

Item number  d D H h
PNA3,9 • 7,5N 01 3,9 7,5 3 1,6
PNA8 • 14N 01 8 14 5 2,4
PNA8 • 16A01 8 16 5 2
PNA8 •  16 N01 8 16 5 2
PNA9 • 16N 01 9 16 5 2,4
PNA10 • 19N 01 10 19 6,3 3,2
PNA10 • 20N 01 10 20 7,5 3,3
PNA11 • 17N 01 11 17 4,5 2,2
PNA12 • 18N 01 12 20 4,5 2
PNA14 • 20N 01 14 20 4,5 2
PNA14 • 20N 01 14 22 4,5 2
PNA14 • 22N 01 14 22 5,5 2,5
PNA14 • 22N 01 14 24 5,5 2,5
PNA15 • 24N 01 15 32 6,3 3,2
PNA16 • 32N 01 16 25 12 5,5
PNA17 • 25N 01 17 18 6,5 3,2
PNA18 • 24N 01 18 25 24 5
PNA18 • 25N 01 18 27 4,5 2,5
PNA18 • 27N 01 18 28 6,3 3,2
PNA18 • 28N 01 18 37 7 3,2
PNA25 • 37N 01 25 37 8 4
PNA28 •40N 01 28 40 9 4
PNA32 • 48N 01 32 48 9,5 5
PNA33 • 40N 01 33 40 8 5
PNA35 • 43A 01 35 43 4,5 2
PNA41 • 57N 01 41 57 12 5,5
PNA48 • 61N 01 48 61 9 4
PNA86 • 100N 01 86 100 16 9
PNA90 • 100N 01 90 100 14 9
PNA 110 • 125A 01 110 125 10 5
PNA 110 • 125N 01 110 125 16 9
PNA 115,1 • 125N 01 115,1 125 14 8
PNA120 • 140 N 01 120 140 15 8
PNA130 • 150 N01 130 150 15 8
PNA135 • 145 A 01 135 145 10 4,5
PNA138 • 150 N 01 138 150 8 4
PNA140 • 150A 01 140 150 10 4,5
PNA142 • 158N 01 142 158 13 7
PNA160 • 170A 01 160 170 10 4,5
PNA171,2 • 190N 01 171,2 190 19,5 11
PNA 180 • 200A 01 180 200 14 8

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